From 1fff275f8d322d44355a08f2eac3e7c4905fc382 Mon Sep 17 00:00:00 2001 From: paoda Date: Fri, 9 Feb 2024 01:16:29 -0600 Subject: [PATCH] chore: implement sdl2 backend support --- build.zig | 11 + .../backends/imgui_impl_opengl3_loader.h | 814 ++++++++++++++++++ libs/imgui/backends/imgui_impl_sdl.cpp | 572 ++++++++++++ libs/imgui/backends/imgui_impl_sdl.h | 38 + src/backend_sdl2_opengl.zig | 42 + src/gui.zig | 1 + src/main.zig | 1 + 7 files changed, 1479 insertions(+) create mode 100644 libs/imgui/backends/imgui_impl_opengl3_loader.h create mode 100644 libs/imgui/backends/imgui_impl_sdl.cpp create mode 100644 libs/imgui/backends/imgui_impl_sdl.h create mode 100644 src/backend_sdl2_opengl.zig diff --git a/build.zig b/build.zig index 08fd840..37d03cb 100644 --- a/build.zig +++ b/build.zig @@ -5,6 +5,7 @@ pub const Backend = enum { glfw_wgpu, glfw_opengl3, win32_dx12, + sdl2_opengl3, }; const default_options = struct { @@ -148,6 +149,16 @@ pub fn package( .flags = &(cflags.* ++ .{"-DIMGUI_IMPL_OPENGL_LOADER_CUSTOM"}), }); }, + .sdl2_opengl3 => { + zgui_c_cpp.addCSourceFiles(.{ + .files = &.{ + thisDir() ++ "/libs/imgui/backends/imgui_impl_sdl.cpp", + thisDir() ++ "/libs/imgui/backends/imgui_impl_opengl3.cpp", + thisDir() ++ "/libs/imgui/backends/imgui_impl_opengl3_loader.h", + }, + .flags = cflags, + }); + }, .win32_dx12 => { zgui_c_cpp.addCSourceFiles(.{ .files = &.{ diff --git a/libs/imgui/backends/imgui_impl_opengl3_loader.h b/libs/imgui/backends/imgui_impl_opengl3_loader.h new file mode 100644 index 0000000..85c58c4 --- /dev/null +++ b/libs/imgui/backends/imgui_impl_opengl3_loader.h @@ -0,0 +1,814 @@ +//----------------------------------------------------------------------------- +// About imgui_impl_opengl3_loader.h: +// +// We embed our own OpenGL loader to not require user to provide their own or to have to use ours, +// which proved to be endless problems for users. +// Our loader is custom-generated, based on gl3w but automatically filtered to only include +// enums/functions that we use in our imgui_impl_opengl3.cpp source file in order to be small. +// +// YOU SHOULD NOT NEED TO INCLUDE/USE THIS DIRECTLY. THIS IS USED BY imgui_impl_opengl3.cpp ONLY. +// THE REST OF YOUR APP SHOULD USE A DIFFERENT GL LOADER: ANY GL LOADER OF YOUR CHOICE. +// +// IF YOU GET BUILD ERRORS IN THIS FILE (commonly macro redefinitions or function redefinitions): +// IT LIKELY MEANS THAT YOU ARE BUILDING 'imgui_impl_opengl3.cpp' OR INCUDING 'imgui_impl_opengl3_loader.h' +// IN THE SAME COMPILATION UNIT AS ONE OF YOUR FILE WHICH IS USING A THIRD-PARTY OPENGL LOADER. +// (e.g. COULD HAPPEN IF YOU ARE DOING A UNITY/JUMBO BUILD, OR INCLUDING .CPP FILES FROM OTHERS) +// YOU SHOULD NOT BUILD BOTH IN THE SAME COMPILATION UNIT. +// BUT IF YOU REALLY WANT TO, you can '#define IMGUI_IMPL_OPENGL_LOADER_CUSTOM' and imgui_impl_opengl3.cpp +// WILL NOT BE USING OUR LOADER, AND INSTEAD EXPECT ANOTHER/YOUR LOADER TO BE AVAILABLE IN THE COMPILATION UNIT. +// +// Regenerate with: +// python gl3w_gen.py --output ../imgui/backends/imgui_impl_opengl3_loader.h --ref ../imgui/backends/imgui_impl_opengl3.cpp ./extra_symbols.txt +// +// More info: +// https://github.com/dearimgui/gl3w_stripped +// https://github.com/ocornut/imgui/issues/4445 +//----------------------------------------------------------------------------- + +/* + * This file was generated with gl3w_gen.py, part of imgl3w + * (hosted at https://github.com/dearimgui/gl3w_stripped) + * + * This is free and unencumbered software released into the public domain. + * + * Anyone is free to copy, modify, publish, use, compile, sell, or + * distribute this software, either in source code form or as a compiled + * binary, for any purpose, commercial or non-commercial, and by any + * means. + * + * In jurisdictions that recognize copyright laws, the author or authors + * of this software dedicate any and all copyright interest in the + * software to the public domain. We make this dedication for the benefit + * of the public at large and to the detriment of our heirs and + * successors. We intend this dedication to be an overt act of + * relinquishment in perpetuity of all present and future rights to this + * software under copyright law. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#ifndef __gl3w_h_ +#define __gl3w_h_ + +// Adapted from KHR/khrplatform.h to avoid including entire file. +#ifndef __khrplatform_h_ +typedef float khronos_float_t; +typedef signed char khronos_int8_t; +typedef unsigned char khronos_uint8_t; +typedef signed short int khronos_int16_t; +typedef unsigned short int khronos_uint16_t; +#ifdef _WIN64 +typedef signed long long int khronos_intptr_t; +typedef signed long long int khronos_ssize_t; +#else +typedef signed long int khronos_intptr_t; +typedef signed long int khronos_ssize_t; +#endif + +#if defined(_MSC_VER) && !defined(__clang__) +typedef signed __int64 khronos_int64_t; +typedef unsigned __int64 khronos_uint64_t; +#elif (defined(__clang__) || defined(__GNUC__)) && (__cplusplus < 201100) +#include +typedef int64_t khronos_int64_t; +typedef uint64_t khronos_uint64_t; +#else +typedef signed long long khronos_int64_t; +typedef unsigned long long khronos_uint64_t; +#endif +#endif // __khrplatform_h_ + +#ifndef __gl_glcorearb_h_ +#define __gl_glcorearb_h_ 1 +#ifdef __cplusplus +extern "C" { +#endif +/* +** Copyright 2013-2020 The Khronos Group Inc. +** SPDX-License-Identifier: MIT +** +** This header is generated from the Khronos OpenGL / OpenGL ES XML +** API Registry. The current version of the Registry, generator scripts +** used to make the header, and the header can be found at +** https://github.com/KhronosGroup/OpenGL-Registry +*/ +#if defined(_WIN32) && !defined(APIENTRY) && !defined(__CYGWIN__) && !defined(__SCITECH_SNAP__) +#ifndef WIN32_LEAN_AND_MEAN +#define WIN32_LEAN_AND_MEAN 1 +#endif +#include +#endif +#ifndef APIENTRY +#define APIENTRY +#endif +#ifndef APIENTRYP +#define APIENTRYP APIENTRY * +#endif +#ifndef GLAPI +#define GLAPI extern +#endif +/* glcorearb.h is for use with OpenGL core profile implementations. +** It should should be placed in the same directory as gl.h and +** included as . +** +** glcorearb.h includes only APIs in the latest OpenGL core profile +** implementation together with APIs in newer ARB extensions which +** can be supported by the core profile. It does not, and never will +** include functionality removed from the core profile, such as +** fixed-function vertex and fragment processing. +** +** Do not #include both and either of or +** in the same source file. +*/ +/* Generated C header for: + * API: gl + * Profile: core + * Versions considered: .* + * Versions emitted: .* + * Default extensions included: glcore + * Additional extensions included: _nomatch_^ + * Extensions removed: _nomatch_^ + */ +#ifndef GL_VERSION_1_0 +typedef void GLvoid; +typedef unsigned int GLenum; + +typedef khronos_float_t GLfloat; +typedef int GLint; +typedef int GLsizei; +typedef unsigned int GLbitfield; +typedef double GLdouble; +typedef unsigned int GLuint; +typedef unsigned char GLboolean; +typedef khronos_uint8_t GLubyte; +#define GL_COLOR_BUFFER_BIT 0x00004000 +#define GL_FALSE 0 +#define GL_TRUE 1 +#define GL_TRIANGLES 0x0004 +#define GL_ONE 1 +#define GL_SRC_ALPHA 0x0302 +#define GL_ONE_MINUS_SRC_ALPHA 0x0303 +#define GL_FRONT 0x0404 +#define GL_BACK 0x0405 +#define GL_FRONT_AND_BACK 0x0408 +#define GL_POLYGON_MODE 0x0B40 +#define GL_CULL_FACE 0x0B44 +#define GL_DEPTH_TEST 0x0B71 +#define GL_STENCIL_TEST 0x0B90 +#define GL_VIEWPORT 0x0BA2 +#define GL_BLEND 0x0BE2 +#define GL_SCISSOR_BOX 0x0C10 +#define GL_SCISSOR_TEST 0x0C11 +#define GL_UNPACK_ROW_LENGTH 0x0CF2 +#define GL_PACK_ALIGNMENT 0x0D05 +#define GL_TEXTURE_2D 0x0DE1 +#define GL_UNSIGNED_BYTE 0x1401 +#define GL_UNSIGNED_SHORT 0x1403 +#define GL_UNSIGNED_INT 0x1405 +#define GL_FLOAT 0x1406 +#define GL_RGBA 0x1908 +#define GL_FILL 0x1B02 +#define GL_VENDOR 0x1F00 +#define GL_RENDERER 0x1F01 +#define GL_VERSION 0x1F02 +#define GL_EXTENSIONS 0x1F03 +#define GL_LINEAR 0x2601 +#define GL_TEXTURE_MAG_FILTER 0x2800 +#define GL_TEXTURE_MIN_FILTER 0x2801 +typedef void (APIENTRYP PFNGLPOLYGONMODEPROC) (GLenum face, GLenum mode); +typedef void (APIENTRYP PFNGLSCISSORPROC) (GLint x, GLint y, GLsizei width, GLsizei height); +typedef void (APIENTRYP PFNGLTEXPARAMETERIPROC) (GLenum target, GLenum pname, GLint param); +typedef void (APIENTRYP PFNGLTEXIMAGE2DPROC) (GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void *pixels); +typedef void (APIENTRYP PFNGLCLEARPROC) (GLbitfield mask); +typedef void (APIENTRYP PFNGLCLEARCOLORPROC) (GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha); +typedef void (APIENTRYP PFNGLDISABLEPROC) (GLenum cap); +typedef void (APIENTRYP PFNGLENABLEPROC) (GLenum cap); +typedef void (APIENTRYP PFNGLFLUSHPROC) (void); +typedef void (APIENTRYP PFNGLPIXELSTOREIPROC) (GLenum pname, GLint param); +typedef void (APIENTRYP PFNGLREADPIXELSPROC) (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void *pixels); +typedef GLenum (APIENTRYP PFNGLGETERRORPROC) (void); +typedef void (APIENTRYP PFNGLGETINTEGERVPROC) (GLenum pname, GLint *data); +typedef const GLubyte *(APIENTRYP PFNGLGETSTRINGPROC) (GLenum name); +typedef GLboolean (APIENTRYP PFNGLISENABLEDPROC) (GLenum cap); +typedef void (APIENTRYP PFNGLVIEWPORTPROC) (GLint x, GLint y, GLsizei width, GLsizei height); +#ifdef GL_GLEXT_PROTOTYPES +GLAPI void APIENTRY glPolygonMode (GLenum face, GLenum mode); +GLAPI void APIENTRY glScissor (GLint x, GLint y, GLsizei width, GLsizei height); +GLAPI void APIENTRY glTexParameteri (GLenum target, GLenum pname, GLint param); +GLAPI void APIENTRY glTexImage2D (GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void *pixels); +GLAPI void APIENTRY glClear (GLbitfield mask); +GLAPI void APIENTRY glClearColor (GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha); +GLAPI void APIENTRY glDisable (GLenum cap); +GLAPI void APIENTRY glEnable (GLenum cap); +GLAPI void APIENTRY glFlush (void); +GLAPI void APIENTRY glPixelStorei (GLenum pname, GLint param); +GLAPI void APIENTRY glReadPixels (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void *pixels); +GLAPI GLenum APIENTRY glGetError (void); +GLAPI void APIENTRY glGetIntegerv (GLenum pname, GLint *data); +GLAPI const GLubyte *APIENTRY glGetString (GLenum name); +GLAPI GLboolean APIENTRY glIsEnabled (GLenum cap); +GLAPI void APIENTRY glViewport (GLint x, GLint y, GLsizei width, GLsizei height); +#endif +#endif /* GL_VERSION_1_0 */ +#ifndef GL_VERSION_1_1 +typedef khronos_float_t GLclampf; +typedef double GLclampd; +#define GL_TEXTURE_BINDING_2D 0x8069 +typedef void (APIENTRYP PFNGLDRAWELEMENTSPROC) (GLenum mode, GLsizei count, GLenum type, const void *indices); +typedef void (APIENTRYP PFNGLBINDTEXTUREPROC) (GLenum target, GLuint texture); +typedef void (APIENTRYP PFNGLDELETETEXTURESPROC) (GLsizei n, const GLuint *textures); +typedef void (APIENTRYP PFNGLGENTEXTURESPROC) (GLsizei n, GLuint *textures); +#ifdef GL_GLEXT_PROTOTYPES +GLAPI void APIENTRY glDrawElements (GLenum mode, GLsizei count, GLenum type, const void *indices); +GLAPI void APIENTRY glBindTexture (GLenum target, GLuint texture); +GLAPI void APIENTRY glDeleteTextures (GLsizei n, const GLuint *textures); +GLAPI void APIENTRY glGenTextures (GLsizei n, GLuint *textures); +#endif +#endif /* GL_VERSION_1_1 */ +#ifndef GL_VERSION_1_3 +#define GL_TEXTURE0 0x84C0 +#define GL_ACTIVE_TEXTURE 0x84E0 +typedef void (APIENTRYP PFNGLACTIVETEXTUREPROC) (GLenum texture); +#ifdef GL_GLEXT_PROTOTYPES +GLAPI void APIENTRY glActiveTexture (GLenum texture); +#endif +#endif /* GL_VERSION_1_3 */ +#ifndef GL_VERSION_1_4 +#define GL_BLEND_DST_RGB 0x80C8 +#define GL_BLEND_SRC_RGB 0x80C9 +#define GL_BLEND_DST_ALPHA 0x80CA +#define GL_BLEND_SRC_ALPHA 0x80CB +#define GL_FUNC_ADD 0x8006 +typedef void (APIENTRYP PFNGLBLENDFUNCSEPARATEPROC) (GLenum sfactorRGB, GLenum dfactorRGB, GLenum sfactorAlpha, GLenum dfactorAlpha); +typedef void (APIENTRYP PFNGLBLENDEQUATIONPROC) (GLenum mode); +#ifdef GL_GLEXT_PROTOTYPES +GLAPI void APIENTRY glBlendFuncSeparate (GLenum sfactorRGB, GLenum dfactorRGB, GLenum sfactorAlpha, GLenum dfactorAlpha); +GLAPI void APIENTRY glBlendEquation (GLenum mode); +#endif +#endif /* GL_VERSION_1_4 */ +#ifndef GL_VERSION_1_5 +typedef khronos_ssize_t GLsizeiptr; +typedef khronos_intptr_t GLintptr; +#define GL_ARRAY_BUFFER 0x8892 +#define GL_ELEMENT_ARRAY_BUFFER 0x8893 +#define GL_ARRAY_BUFFER_BINDING 0x8894 +#define GL_ELEMENT_ARRAY_BUFFER_BINDING 0x8895 +#define GL_STREAM_DRAW 0x88E0 +typedef void (APIENTRYP PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer); +typedef void (APIENTRYP PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint *buffers); +typedef void (APIENTRYP PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers); +typedef void (APIENTRYP PFNGLBUFFERDATAPROC) (GLenum target, GLsizeiptr size, const void *data, GLenum usage); +typedef void (APIENTRYP PFNGLBUFFERSUBDATAPROC) (GLenum target, GLintptr offset, GLsizeiptr size, const void *data); +#ifdef GL_GLEXT_PROTOTYPES +GLAPI void APIENTRY glBindBuffer (GLenum target, GLuint buffer); +GLAPI void APIENTRY glDeleteBuffers (GLsizei n, const GLuint *buffers); +GLAPI void APIENTRY glGenBuffers (GLsizei n, GLuint *buffers); +GLAPI void APIENTRY glBufferData (GLenum target, GLsizeiptr size, const void *data, GLenum usage); +GLAPI void APIENTRY glBufferSubData (GLenum target, GLintptr offset, GLsizeiptr size, const void *data); +#endif +#endif /* GL_VERSION_1_5 */ +#ifndef GL_VERSION_2_0 +typedef char GLchar; +typedef khronos_int16_t GLshort; +typedef khronos_int8_t GLbyte; +typedef khronos_uint16_t GLushort; +#define GL_BLEND_EQUATION_RGB 0x8009 +#define GL_VERTEX_ATTRIB_ARRAY_ENABLED 0x8622 +#define GL_VERTEX_ATTRIB_ARRAY_SIZE 0x8623 +#define GL_VERTEX_ATTRIB_ARRAY_STRIDE 0x8624 +#define GL_VERTEX_ATTRIB_ARRAY_TYPE 0x8625 +#define GL_VERTEX_ATTRIB_ARRAY_POINTER 0x8645 +#define GL_BLEND_EQUATION_ALPHA 0x883D +#define GL_VERTEX_ATTRIB_ARRAY_NORMALIZED 0x886A +#define GL_FRAGMENT_SHADER 0x8B30 +#define GL_VERTEX_SHADER 0x8B31 +#define GL_COMPILE_STATUS 0x8B81 +#define GL_LINK_STATUS 0x8B82 +#define GL_INFO_LOG_LENGTH 0x8B84 +#define GL_CURRENT_PROGRAM 0x8B8D +#define GL_UPPER_LEFT 0x8CA2 +typedef void (APIENTRYP PFNGLBLENDEQUATIONSEPARATEPROC) (GLenum modeRGB, GLenum modeAlpha); +typedef void (APIENTRYP PFNGLATTACHSHADERPROC) (GLuint program, GLuint shader); +typedef void (APIENTRYP PFNGLCOMPILESHADERPROC) (GLuint shader); +typedef GLuint (APIENTRYP PFNGLCREATEPROGRAMPROC) (void); +typedef GLuint (APIENTRYP PFNGLCREATESHADERPROC) (GLenum type); +typedef void (APIENTRYP PFNGLDELETEPROGRAMPROC) (GLuint program); +typedef void (APIENTRYP PFNGLDELETESHADERPROC) (GLuint shader); +typedef void (APIENTRYP PFNGLDETACHSHADERPROC) (GLuint program, GLuint shader); +typedef void (APIENTRYP PFNGLDISABLEVERTEXATTRIBARRAYPROC) (GLuint index); +typedef void (APIENTRYP PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index); +typedef GLint (APIENTRYP PFNGLGETATTRIBLOCATIONPROC) (GLuint program, const GLchar *name); +typedef void (APIENTRYP PFNGLGETPROGRAMIVPROC) (GLuint program, GLenum pname, GLint *params); +typedef void (APIENTRYP PFNGLGETPROGRAMINFOLOGPROC) (GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog); +typedef void (APIENTRYP PFNGLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params); +typedef void (APIENTRYP PFNGLGETSHADERINFOLOGPROC) (GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog); +typedef GLint (APIENTRYP PFNGLGETUNIFORMLOCATIONPROC) (GLuint program, const GLchar *name); +typedef void (APIENTRYP PFNGLGETVERTEXATTRIBIVPROC) (GLuint index, GLenum pname, GLint *params); +typedef void (APIENTRYP PFNGLGETVERTEXATTRIBPOINTERVPROC) (GLuint index, GLenum pname, void **pointer); +typedef GLboolean (APIENTRYP PFNGLISPROGRAMPROC) (GLuint program); +typedef void (APIENTRYP PFNGLLINKPROGRAMPROC) (GLuint program); +typedef void (APIENTRYP PFNGLSHADERSOURCEPROC) (GLuint shader, GLsizei count, const GLchar *const*string, const GLint *length); +typedef void (APIENTRYP PFNGLUSEPROGRAMPROC) (GLuint program); +typedef void (APIENTRYP PFNGLUNIFORM1IPROC) (GLint location, GLint v0); +typedef void (APIENTRYP PFNGLUNIFORMMATRIX4FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value); +typedef void (APIENTRYP PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const void *pointer); +#ifdef GL_GLEXT_PROTOTYPES +GLAPI void APIENTRY glBlendEquationSeparate (GLenum modeRGB, GLenum modeAlpha); +GLAPI void APIENTRY glAttachShader (GLuint program, GLuint shader); +GLAPI void APIENTRY glCompileShader (GLuint shader); +GLAPI GLuint APIENTRY glCreateProgram (void); +GLAPI GLuint APIENTRY glCreateShader (GLenum type); +GLAPI void APIENTRY glDeleteProgram (GLuint program); +GLAPI void APIENTRY glDeleteShader (GLuint shader); +GLAPI void APIENTRY glDetachShader (GLuint program, GLuint shader); +GLAPI void APIENTRY glDisableVertexAttribArray (GLuint index); +GLAPI void APIENTRY glEnableVertexAttribArray (GLuint index); +GLAPI GLint APIENTRY glGetAttribLocation (GLuint program, const GLchar *name); +GLAPI void APIENTRY glGetProgramiv (GLuint program, GLenum pname, GLint *params); +GLAPI void APIENTRY glGetProgramInfoLog (GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog); +GLAPI void APIENTRY glGetShaderiv (GLuint shader, GLenum pname, GLint *params); +GLAPI void APIENTRY glGetShaderInfoLog (GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog); +GLAPI GLint APIENTRY glGetUniformLocation (GLuint program, const GLchar *name); +GLAPI void APIENTRY glGetVertexAttribiv (GLuint index, GLenum pname, GLint *params); +GLAPI void APIENTRY glGetVertexAttribPointerv (GLuint index, GLenum pname, void **pointer); +GLAPI GLboolean APIENTRY glIsProgram (GLuint program); +GLAPI void APIENTRY glLinkProgram (GLuint program); +GLAPI void APIENTRY glShaderSource (GLuint shader, GLsizei count, const GLchar *const*string, const GLint *length); +GLAPI void APIENTRY glUseProgram (GLuint program); +GLAPI void APIENTRY glUniform1i (GLint location, GLint v0); +GLAPI void APIENTRY glUniformMatrix4fv (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value); +GLAPI void APIENTRY glVertexAttribPointer (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const void *pointer); +#endif +#endif /* GL_VERSION_2_0 */ +#ifndef GL_VERSION_3_0 +typedef khronos_uint16_t GLhalf; +#define GL_MAJOR_VERSION 0x821B +#define GL_MINOR_VERSION 0x821C +#define GL_NUM_EXTENSIONS 0x821D +#define GL_FRAMEBUFFER_SRGB 0x8DB9 +#define GL_VERTEX_ARRAY_BINDING 0x85B5 +typedef void (APIENTRYP PFNGLGETBOOLEANI_VPROC) (GLenum target, GLuint index, GLboolean *data); +typedef void (APIENTRYP PFNGLGETINTEGERI_VPROC) (GLenum target, GLuint index, GLint *data); +typedef const GLubyte *(APIENTRYP PFNGLGETSTRINGIPROC) (GLenum name, GLuint index); +typedef void (APIENTRYP PFNGLBINDVERTEXARRAYPROC) (GLuint array); +typedef void (APIENTRYP PFNGLDELETEVERTEXARRAYSPROC) (GLsizei n, const GLuint *arrays); +typedef void (APIENTRYP PFNGLGENVERTEXARRAYSPROC) (GLsizei n, GLuint *arrays); +#ifdef GL_GLEXT_PROTOTYPES +GLAPI const GLubyte *APIENTRY glGetStringi (GLenum name, GLuint index); +GLAPI void APIENTRY glBindVertexArray (GLuint array); +GLAPI void APIENTRY glDeleteVertexArrays (GLsizei n, const GLuint *arrays); +GLAPI void APIENTRY glGenVertexArrays (GLsizei n, GLuint *arrays); +#endif +#endif /* GL_VERSION_3_0 */ +#ifndef GL_VERSION_3_1 +#define GL_VERSION_3_1 1 +#define GL_PRIMITIVE_RESTART 0x8F9D +#endif /* GL_VERSION_3_1 */ +#ifndef GL_VERSION_3_2 +#define GL_VERSION_3_2 1 +typedef struct __GLsync *GLsync; +typedef khronos_uint64_t GLuint64; +typedef khronos_int64_t GLint64; +#define GL_CONTEXT_COMPATIBILITY_PROFILE_BIT 0x00000002 +#define GL_CONTEXT_PROFILE_MASK 0x9126 +typedef void (APIENTRYP PFNGLDRAWELEMENTSBASEVERTEXPROC) (GLenum mode, GLsizei count, GLenum type, const void *indices, GLint basevertex); +typedef void (APIENTRYP PFNGLGETINTEGER64I_VPROC) (GLenum target, GLuint index, GLint64 *data); +#ifdef GL_GLEXT_PROTOTYPES +GLAPI void APIENTRY glDrawElementsBaseVertex (GLenum mode, GLsizei count, GLenum type, const void *indices, GLint basevertex); +#endif +#endif /* GL_VERSION_3_2 */ +#ifndef GL_VERSION_3_3 +#define GL_VERSION_3_3 1 +#define GL_SAMPLER_BINDING 0x8919 +typedef void (APIENTRYP PFNGLBINDSAMPLERPROC) (GLuint unit, GLuint sampler); +#ifdef GL_GLEXT_PROTOTYPES +GLAPI void APIENTRY glBindSampler (GLuint unit, GLuint sampler); +#endif +#endif /* GL_VERSION_3_3 */ +#ifndef GL_VERSION_4_1 +typedef void (APIENTRYP PFNGLGETFLOATI_VPROC) (GLenum target, GLuint index, GLfloat *data); +typedef void (APIENTRYP PFNGLGETDOUBLEI_VPROC) (GLenum target, GLuint index, GLdouble *data); +#endif /* GL_VERSION_4_1 */ +#ifndef GL_VERSION_4_3 +typedef void (APIENTRY *GLDEBUGPROC)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,const void *userParam); +#endif /* GL_VERSION_4_3 */ +#ifndef GL_VERSION_4_5 +#define GL_CLIP_ORIGIN 0x935C +typedef void (APIENTRYP PFNGLGETTRANSFORMFEEDBACKI_VPROC) (GLuint xfb, GLenum pname, GLuint index, GLint *param); +typedef void (APIENTRYP PFNGLGETTRANSFORMFEEDBACKI64_VPROC) (GLuint xfb, GLenum pname, GLuint index, GLint64 *param); +#endif /* GL_VERSION_4_5 */ +#ifndef GL_ARB_bindless_texture +typedef khronos_uint64_t GLuint64EXT; +#endif /* GL_ARB_bindless_texture */ +#ifndef GL_ARB_cl_event +struct _cl_context; +struct _cl_event; +#endif /* GL_ARB_cl_event */ +#ifndef GL_ARB_clip_control +#define GL_ARB_clip_control 1 +#endif /* GL_ARB_clip_control */ +#ifndef GL_ARB_debug_output +typedef void (APIENTRY *GLDEBUGPROCARB)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,const void *userParam); +#endif /* GL_ARB_debug_output */ +#ifndef GL_EXT_EGL_image_storage +typedef void *GLeglImageOES; +#endif /* GL_EXT_EGL_image_storage */ +#ifndef GL_EXT_direct_state_access +typedef void (APIENTRYP PFNGLGETFLOATI_VEXTPROC) (GLenum pname, GLuint index, GLfloat *params); +typedef void (APIENTRYP PFNGLGETDOUBLEI_VEXTPROC) (GLenum pname, GLuint index, GLdouble *params); +typedef void (APIENTRYP PFNGLGETPOINTERI_VEXTPROC) (GLenum pname, GLuint index, void **params); +typedef void (APIENTRYP PFNGLGETVERTEXARRAYINTEGERI_VEXTPROC) (GLuint vaobj, GLuint index, GLenum pname, GLint *param); +typedef void (APIENTRYP PFNGLGETVERTEXARRAYPOINTERI_VEXTPROC) (GLuint vaobj, GLuint index, GLenum pname, void **param); +#endif /* GL_EXT_direct_state_access */ +#ifndef GL_NV_draw_vulkan_image +typedef void (APIENTRY *GLVULKANPROCNV)(void); +#endif /* GL_NV_draw_vulkan_image */ +#ifndef GL_NV_gpu_shader5 +typedef khronos_int64_t GLint64EXT; +#endif /* GL_NV_gpu_shader5 */ +#ifndef GL_NV_vertex_buffer_unified_memory +typedef void (APIENTRYP PFNGLGETINTEGERUI64I_VNVPROC) (GLenum value, GLuint index, GLuint64EXT *result); +#endif /* GL_NV_vertex_buffer_unified_memory */ +#ifdef __cplusplus +} +#endif +#endif + +#ifndef GL3W_API +#define GL3W_API +#endif + +#ifndef __gl_h_ +#define __gl_h_ +#endif + +#ifdef __cplusplus +extern "C" { +#endif + +#define GL3W_OK 0 +#define GL3W_ERROR_INIT -1 +#define GL3W_ERROR_LIBRARY_OPEN -2 +#define GL3W_ERROR_OPENGL_VERSION -3 + +typedef void (*GL3WglProc)(void); +typedef GL3WglProc (*GL3WGetProcAddressProc)(const char *proc); + +/* gl3w api */ +GL3W_API int imgl3wInit(void); +GL3W_API int imgl3wInit2(GL3WGetProcAddressProc proc); +GL3W_API int imgl3wIsSupported(int major, int minor); +GL3W_API GL3WglProc imgl3wGetProcAddress(const char *proc); + +/* gl3w internal state */ +union ImGL3WProcs { + GL3WglProc ptr[59]; + struct { + PFNGLACTIVETEXTUREPROC ActiveTexture; + PFNGLATTACHSHADERPROC AttachShader; + PFNGLBINDBUFFERPROC BindBuffer; + PFNGLBINDSAMPLERPROC BindSampler; + PFNGLBINDTEXTUREPROC BindTexture; + PFNGLBINDVERTEXARRAYPROC BindVertexArray; + PFNGLBLENDEQUATIONPROC BlendEquation; + PFNGLBLENDEQUATIONSEPARATEPROC BlendEquationSeparate; + PFNGLBLENDFUNCSEPARATEPROC BlendFuncSeparate; + PFNGLBUFFERDATAPROC BufferData; + PFNGLBUFFERSUBDATAPROC BufferSubData; + PFNGLCLEARPROC Clear; + PFNGLCLEARCOLORPROC ClearColor; + PFNGLCOMPILESHADERPROC CompileShader; + PFNGLCREATEPROGRAMPROC CreateProgram; + PFNGLCREATESHADERPROC CreateShader; + PFNGLDELETEBUFFERSPROC DeleteBuffers; + PFNGLDELETEPROGRAMPROC DeleteProgram; + PFNGLDELETESHADERPROC DeleteShader; + PFNGLDELETETEXTURESPROC DeleteTextures; + PFNGLDELETEVERTEXARRAYSPROC DeleteVertexArrays; + PFNGLDETACHSHADERPROC DetachShader; + PFNGLDISABLEPROC Disable; + PFNGLDISABLEVERTEXATTRIBARRAYPROC DisableVertexAttribArray; + PFNGLDRAWELEMENTSPROC DrawElements; + PFNGLDRAWELEMENTSBASEVERTEXPROC DrawElementsBaseVertex; + PFNGLENABLEPROC Enable; + PFNGLENABLEVERTEXATTRIBARRAYPROC EnableVertexAttribArray; + PFNGLFLUSHPROC Flush; + PFNGLGENBUFFERSPROC GenBuffers; + PFNGLGENTEXTURESPROC GenTextures; + PFNGLGENVERTEXARRAYSPROC GenVertexArrays; + PFNGLGETATTRIBLOCATIONPROC GetAttribLocation; + PFNGLGETERRORPROC GetError; + PFNGLGETINTEGERVPROC GetIntegerv; + PFNGLGETPROGRAMINFOLOGPROC GetProgramInfoLog; + PFNGLGETPROGRAMIVPROC GetProgramiv; + PFNGLGETSHADERINFOLOGPROC GetShaderInfoLog; + PFNGLGETSHADERIVPROC GetShaderiv; + PFNGLGETSTRINGPROC GetString; + PFNGLGETSTRINGIPROC GetStringi; + PFNGLGETUNIFORMLOCATIONPROC GetUniformLocation; + PFNGLGETVERTEXATTRIBPOINTERVPROC GetVertexAttribPointerv; + PFNGLGETVERTEXATTRIBIVPROC GetVertexAttribiv; + PFNGLISENABLEDPROC IsEnabled; + PFNGLISPROGRAMPROC IsProgram; + PFNGLLINKPROGRAMPROC LinkProgram; + PFNGLPIXELSTOREIPROC PixelStorei; + PFNGLPOLYGONMODEPROC PolygonMode; + PFNGLREADPIXELSPROC ReadPixels; + PFNGLSCISSORPROC Scissor; + PFNGLSHADERSOURCEPROC ShaderSource; + PFNGLTEXIMAGE2DPROC TexImage2D; + PFNGLTEXPARAMETERIPROC TexParameteri; + PFNGLUNIFORM1IPROC Uniform1i; + PFNGLUNIFORMMATRIX4FVPROC UniformMatrix4fv; + PFNGLUSEPROGRAMPROC UseProgram; + PFNGLVERTEXATTRIBPOINTERPROC VertexAttribPointer; + PFNGLVIEWPORTPROC Viewport; + } gl; +}; + +GL3W_API extern union ImGL3WProcs imgl3wProcs; + +/* OpenGL functions */ +#define glActiveTexture imgl3wProcs.gl.ActiveTexture +#define glAttachShader imgl3wProcs.gl.AttachShader +#define glBindBuffer imgl3wProcs.gl.BindBuffer +#define glBindSampler imgl3wProcs.gl.BindSampler +#define glBindTexture imgl3wProcs.gl.BindTexture +#define glBindVertexArray imgl3wProcs.gl.BindVertexArray +#define glBlendEquation imgl3wProcs.gl.BlendEquation +#define glBlendEquationSeparate imgl3wProcs.gl.BlendEquationSeparate +#define glBlendFuncSeparate imgl3wProcs.gl.BlendFuncSeparate +#define glBufferData imgl3wProcs.gl.BufferData +#define glBufferSubData imgl3wProcs.gl.BufferSubData +#define glClear imgl3wProcs.gl.Clear +#define glClearColor imgl3wProcs.gl.ClearColor +#define glCompileShader imgl3wProcs.gl.CompileShader +#define glCreateProgram imgl3wProcs.gl.CreateProgram +#define glCreateShader imgl3wProcs.gl.CreateShader +#define glDeleteBuffers imgl3wProcs.gl.DeleteBuffers +#define glDeleteProgram imgl3wProcs.gl.DeleteProgram +#define glDeleteShader imgl3wProcs.gl.DeleteShader +#define glDeleteTextures imgl3wProcs.gl.DeleteTextures +#define glDeleteVertexArrays imgl3wProcs.gl.DeleteVertexArrays +#define glDetachShader imgl3wProcs.gl.DetachShader +#define glDisable imgl3wProcs.gl.Disable +#define glDisableVertexAttribArray imgl3wProcs.gl.DisableVertexAttribArray +#define glDrawElements imgl3wProcs.gl.DrawElements +#define glDrawElementsBaseVertex imgl3wProcs.gl.DrawElementsBaseVertex +#define glEnable imgl3wProcs.gl.Enable +#define glEnableVertexAttribArray imgl3wProcs.gl.EnableVertexAttribArray +#define glFlush imgl3wProcs.gl.Flush +#define glGenBuffers imgl3wProcs.gl.GenBuffers +#define glGenTextures imgl3wProcs.gl.GenTextures +#define glGenVertexArrays imgl3wProcs.gl.GenVertexArrays +#define glGetAttribLocation imgl3wProcs.gl.GetAttribLocation +#define glGetError imgl3wProcs.gl.GetError +#define glGetIntegerv imgl3wProcs.gl.GetIntegerv +#define glGetProgramInfoLog imgl3wProcs.gl.GetProgramInfoLog +#define glGetProgramiv imgl3wProcs.gl.GetProgramiv +#define glGetShaderInfoLog imgl3wProcs.gl.GetShaderInfoLog +#define glGetShaderiv imgl3wProcs.gl.GetShaderiv +#define glGetString imgl3wProcs.gl.GetString +#define glGetStringi imgl3wProcs.gl.GetStringi +#define glGetUniformLocation imgl3wProcs.gl.GetUniformLocation +#define glGetVertexAttribPointerv imgl3wProcs.gl.GetVertexAttribPointerv +#define glGetVertexAttribiv imgl3wProcs.gl.GetVertexAttribiv +#define glIsEnabled imgl3wProcs.gl.IsEnabled +#define glIsProgram imgl3wProcs.gl.IsProgram +#define glLinkProgram imgl3wProcs.gl.LinkProgram +#define glPixelStorei imgl3wProcs.gl.PixelStorei +#define glPolygonMode imgl3wProcs.gl.PolygonMode +#define glReadPixels imgl3wProcs.gl.ReadPixels +#define glScissor imgl3wProcs.gl.Scissor +#define glShaderSource imgl3wProcs.gl.ShaderSource +#define glTexImage2D imgl3wProcs.gl.TexImage2D +#define glTexParameteri imgl3wProcs.gl.TexParameteri +#define glUniform1i imgl3wProcs.gl.Uniform1i +#define glUniformMatrix4fv imgl3wProcs.gl.UniformMatrix4fv +#define glUseProgram imgl3wProcs.gl.UseProgram +#define glVertexAttribPointer imgl3wProcs.gl.VertexAttribPointer +#define glViewport imgl3wProcs.gl.Viewport + +#ifdef __cplusplus +} +#endif + +#endif + +#ifdef IMGL3W_IMPL +#ifdef __cplusplus +extern "C" { +#endif + +#include + +#define GL3W_ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) + +#if defined(_WIN32) +#ifndef WIN32_LEAN_AND_MEAN +#define WIN32_LEAN_AND_MEAN 1 +#endif +#include + +static HMODULE libgl; +typedef PROC(__stdcall* GL3WglGetProcAddr)(LPCSTR); +static GL3WglGetProcAddr wgl_get_proc_address; + +static int open_libgl(void) +{ + libgl = LoadLibraryA("opengl32.dll"); + if (!libgl) + return GL3W_ERROR_LIBRARY_OPEN; + wgl_get_proc_address = (GL3WglGetProcAddr)GetProcAddress(libgl, "wglGetProcAddress"); + return GL3W_OK; +} + +static void close_libgl(void) { FreeLibrary(libgl); } +static GL3WglProc get_proc(const char *proc) +{ + GL3WglProc res; + res = (GL3WglProc)wgl_get_proc_address(proc); + if (!res) + res = (GL3WglProc)GetProcAddress(libgl, proc); + return res; +} +#elif defined(__APPLE__) +#include + +static void *libgl; +static int open_libgl(void) +{ + libgl = dlopen("/System/Library/Frameworks/OpenGL.framework/OpenGL", RTLD_LAZY | RTLD_LOCAL); + if (!libgl) + return GL3W_ERROR_LIBRARY_OPEN; + return GL3W_OK; +} + +static void close_libgl(void) { dlclose(libgl); } + +static GL3WglProc get_proc(const char *proc) +{ + GL3WglProc res; + *(void **)(&res) = dlsym(libgl, proc); + return res; +} +#else +#include + +static void *libgl; +static GL3WglProc (*glx_get_proc_address)(const GLubyte *); + +static int open_libgl(void) +{ + // While most systems use libGL.so.1, NetBSD seems to use that libGL.so.3. See https://github.com/ocornut/imgui/issues/6983 + libgl = dlopen("libGL.so", RTLD_LAZY | RTLD_LOCAL); + if (!libgl) + libgl = dlopen("libGL.so.1", RTLD_LAZY | RTLD_LOCAL); + if (!libgl) + libgl = dlopen("libGL.so.3", RTLD_LAZY | RTLD_LOCAL); + if (!libgl) + return GL3W_ERROR_LIBRARY_OPEN; + *(void **)(&glx_get_proc_address) = dlsym(libgl, "glXGetProcAddressARB"); + return GL3W_OK; +} + +static void close_libgl(void) { dlclose(libgl); } + +static GL3WglProc get_proc(const char *proc) +{ + GL3WglProc res; + res = glx_get_proc_address((const GLubyte *)proc); + if (!res) + *(void **)(&res) = dlsym(libgl, proc); + return res; +} +#endif + +static struct { int major, minor; } version; + +static int parse_version(void) +{ + if (!glGetIntegerv) + return GL3W_ERROR_INIT; + glGetIntegerv(GL_MAJOR_VERSION, &version.major); + glGetIntegerv(GL_MINOR_VERSION, &version.minor); + if (version.major == 0 && version.minor == 0) + { + // Query GL_VERSION in desktop GL 2.x, the string will start with "." + if (const char* gl_version = (const char*)glGetString(GL_VERSION)) + sscanf(gl_version, "%d.%d", &version.major, &version.minor); + } + if (version.major < 2) + return GL3W_ERROR_OPENGL_VERSION; + return GL3W_OK; +} + +static void load_procs(GL3WGetProcAddressProc proc); + +int imgl3wInit(void) +{ + int res = open_libgl(); + if (res) + return res; + atexit(close_libgl); + return imgl3wInit2(get_proc); +} + +int imgl3wInit2(GL3WGetProcAddressProc proc) +{ + load_procs(proc); + return parse_version(); +} + +int imgl3wIsSupported(int major, int minor) +{ + if (major < 2) + return 0; + if (version.major == major) + return version.minor >= minor; + return version.major >= major; +} + +GL3WglProc imgl3wGetProcAddress(const char *proc) { return get_proc(proc); } + +static const char *proc_names[] = { + "glActiveTexture", + "glAttachShader", + "glBindBuffer", + "glBindSampler", + "glBindTexture", + "glBindVertexArray", + "glBlendEquation", + "glBlendEquationSeparate", + "glBlendFuncSeparate", + "glBufferData", + "glBufferSubData", + "glClear", + "glClearColor", + "glCompileShader", + "glCreateProgram", + "glCreateShader", + "glDeleteBuffers", + "glDeleteProgram", + "glDeleteShader", + "glDeleteTextures", + "glDeleteVertexArrays", + "glDetachShader", + "glDisable", + "glDisableVertexAttribArray", + "glDrawElements", + "glDrawElementsBaseVertex", + "glEnable", + "glEnableVertexAttribArray", + "glFlush", + "glGenBuffers", + "glGenTextures", + "glGenVertexArrays", + "glGetAttribLocation", + "glGetError", + "glGetIntegerv", + "glGetProgramInfoLog", + "glGetProgramiv", + "glGetShaderInfoLog", + "glGetShaderiv", + "glGetString", + "glGetStringi", + "glGetUniformLocation", + "glGetVertexAttribPointerv", + "glGetVertexAttribiv", + "glIsEnabled", + "glIsProgram", + "glLinkProgram", + "glPixelStorei", + "glPolygonMode", + "glReadPixels", + "glScissor", + "glShaderSource", + "glTexImage2D", + "glTexParameteri", + "glUniform1i", + "glUniformMatrix4fv", + "glUseProgram", + "glVertexAttribPointer", + "glViewport", +}; + +GL3W_API union ImGL3WProcs imgl3wProcs; + +static void load_procs(GL3WGetProcAddressProc proc) +{ + size_t i; + for (i = 0; i < GL3W_ARRAY_SIZE(proc_names); i++) + imgl3wProcs.ptr[i] = proc(proc_names[i]); +} + +#ifdef __cplusplus +} +#endif +#endif diff --git a/libs/imgui/backends/imgui_impl_sdl.cpp b/libs/imgui/backends/imgui_impl_sdl.cpp new file mode 100644 index 0000000..53ef3ed --- /dev/null +++ b/libs/imgui/backends/imgui_impl_sdl.cpp @@ -0,0 +1,572 @@ +// dear imgui: Platform Backend for SDL2 +// This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..) +// (Info: SDL2 is a cross-platform general purpose library for handling windows, inputs, graphics context creation, etc.) +// (Prefer SDL 2.0.5+ for full feature support.) + +// Implemented features: +// [X] Platform: Clipboard support. +// [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy SDL_SCANCODE_* values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set] +// [X] Platform: Gamepad support. Enabled with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'. +// [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. +// Missing features: +// [ ] Platform: SDL2 handling of IME under Windows appears to be broken and it explicitly disable the regular Windows IME. You can restore Windows IME by compiling SDL with SDL_DISABLE_WINDOWS_IME. + +// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. +// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need. +// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp. +// Read online: https://github.com/ocornut/imgui/tree/master/docs + +// CHANGELOG +// (minor and older changes stripped away, please see git history for details) +// 2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11. +// 2022-09-26: Inputs: Disable SDL 2.0.22 new "auto capture" (SDL_HINT_MOUSE_AUTO_CAPTURE) which prevents drag and drop across windows for multi-viewport support + don't capture when drag and dropping. (#5710) +// 2022-09-26: Inputs: Renamed ImGuiKey_ModXXX introduced in 1.87 to ImGuiMod_XXX (old names still supported). +// 2022-03-22: Inputs: Fix mouse position issues when dragging outside of boundaries. SDL_CaptureMouse() erroneously still gives out LEAVE events when hovering OS decorations. +// 2022-03-22: Inputs: Added support for extra mouse buttons (SDL_BUTTON_X1/SDL_BUTTON_X2). +// 2022-02-04: Added SDL_Renderer* parameter to ImGui_ImplSDL2_InitForSDLRenderer(), so we can use SDL_GetRendererOutputSize() instead of SDL_GL_GetDrawableSize() when bound to a SDL_Renderer. +// 2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago) with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion. +// 2021-01-20: Inputs: calling new io.AddKeyAnalogEvent() for gamepad support, instead of writing directly to io.NavInputs[]. +// 2022-01-17: Inputs: calling new io.AddMousePosEvent(), io.AddMouseButtonEvent(), io.AddMouseWheelEvent() API (1.87+). +// 2022-01-17: Inputs: always update key mods next and before key event (not in NewFrame) to fix input queue with very low framerates. +// 2022-01-12: Update mouse inputs using SDL_MOUSEMOTION/SDL_WINDOWEVENT_LEAVE + fallback to provide it when focused but not hovered/captured. More standard and will allow us to pass it to future input queue API. +// 2022-01-12: Maintain our own copy of MouseButtonsDown mask instead of using ImGui::IsAnyMouseDown() which will be obsoleted. +// 2022-01-10: Inputs: calling new io.AddKeyEvent(), io.AddKeyModsEvent() + io.SetKeyEventNativeData() API (1.87+). Support for full ImGuiKey range. +// 2021-08-17: Calling io.AddFocusEvent() on SDL_WINDOWEVENT_FOCUS_GAINED/SDL_WINDOWEVENT_FOCUS_LOST. +// 2021-07-29: Inputs: MousePos is correctly reported when the host platform window is hovered but not focused (using SDL_GetMouseFocus() + SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, requires SDL 2.0.5+) +// 2021-06-29: *BREAKING CHANGE* Removed 'SDL_Window* window' parameter to ImGui_ImplSDL2_NewFrame() which was unnecessary. +// 2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX). +// 2021-03-22: Rework global mouse pos availability check listing supported platforms explicitly, effectively fixing mouse access on Raspberry Pi. (#2837, #3950) +// 2020-05-25: Misc: Report a zero display-size when window is minimized, to be consistent with other backends. +// 2020-02-20: Inputs: Fixed mapping for ImGuiKey_KeyPadEnter (using SDL_SCANCODE_KP_ENTER instead of SDL_SCANCODE_RETURN2). +// 2019-12-17: Inputs: On Wayland, use SDL_GetMouseState (because there is no global mouse state). +// 2019-12-05: Inputs: Added support for ImGuiMouseCursor_NotAllowed mouse cursor. +// 2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter. +// 2019-04-23: Inputs: Added support for SDL_GameController (if ImGuiConfigFlags_NavEnableGamepad is set by user application). +// 2019-03-12: Misc: Preserve DisplayFramebufferScale when main window is minimized. +// 2018-12-21: Inputs: Workaround for Android/iOS which don't seem to handle focus related calls. +// 2018-11-30: Misc: Setting up io.BackendPlatformName so it can be displayed in the About Window. +// 2018-11-14: Changed the signature of ImGui_ImplSDL2_ProcessEvent() to take a 'const SDL_Event*'. +// 2018-08-01: Inputs: Workaround for Emscripten which doesn't seem to handle focus related calls. +// 2018-06-29: Inputs: Added support for the ImGuiMouseCursor_Hand cursor. +// 2018-06-08: Misc: Extracted imgui_impl_sdl.cpp/.h away from the old combined SDL2+OpenGL/Vulkan examples. +// 2018-06-08: Misc: ImGui_ImplSDL2_InitForOpenGL() now takes a SDL_GLContext parameter. +// 2018-05-09: Misc: Fixed clipboard paste memory leak (we didn't call SDL_FreeMemory on the data returned by SDL_GetClipboardText). +// 2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag. +// 2018-02-16: Inputs: Added support for mouse cursors, honoring ImGui::GetMouseCursor() value. +// 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves. +// 2018-02-06: Inputs: Added mapping for ImGuiKey_Space. +// 2018-02-05: Misc: Using SDL_GetPerformanceCounter() instead of SDL_GetTicks() to be able to handle very high framerate (1000+ FPS). +// 2018-02-05: Inputs: Keyboard mapping is using scancodes everywhere instead of a confusing mixture of keycodes and scancodes. +// 2018-01-20: Inputs: Added Horizontal Mouse Wheel support. +// 2018-01-19: Inputs: When available (SDL 2.0.4+) using SDL_CaptureMouse() to retrieve coordinates outside of client area when dragging. Otherwise (SDL 2.0.3 and before) testing for SDL_WINDOW_INPUT_FOCUS instead of SDL_WINDOW_MOUSE_FOCUS. +// 2018-01-18: Inputs: Added mapping for ImGuiKey_Insert. +// 2017-08-25: Inputs: MousePos set to -FLT_MAX,-FLT_MAX when mouse is unavailable/missing (instead of -1,-1). +// 2016-10-15: Misc: Added a void* user_data parameter to Clipboard function handlers. + +#include "imgui.h" +#include "imgui_impl_sdl.h" + +// SDL +#include +#include + +#if defined(__APPLE__) +#include +#endif + +#if SDL_VERSION_ATLEAST(2,0,4) && !defined(__EMSCRIPTEN__) && !defined(__ANDROID__) && !(defined(__APPLE__) && TARGET_OS_IOS) && !defined(__amigaos4__) +#define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE 1 +#else +#define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE 0 +#endif +#define SDL_HAS_VULKAN SDL_VERSION_ATLEAST(2,0,6) + +// SDL Data +struct ImGui_ImplSDL2_Data +{ + SDL_Window* Window; + SDL_Renderer* Renderer; + Uint64 Time; + int MouseButtonsDown; + SDL_Cursor* MouseCursors[ImGuiMouseCursor_COUNT]; + int PendingMouseLeaveFrame; + char* ClipboardTextData; + bool MouseCanUseGlobalState; + + ImGui_ImplSDL2_Data() { memset((void*)this, 0, sizeof(*this)); } +}; + +// Backend data stored in io.BackendPlatformUserData to allow support for multiple Dear ImGui contexts +// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts. +// FIXME: multi-context support is not well tested and probably dysfunctional in this backend. +// FIXME: some shared resources (mouse cursor shape, gamepad) are mishandled when using multi-context. +static ImGui_ImplSDL2_Data* ImGui_ImplSDL2_GetBackendData() +{ + return ImGui::GetCurrentContext() ? (ImGui_ImplSDL2_Data*)ImGui::GetIO().BackendPlatformUserData : nullptr; +} + +// Functions +static const char* ImGui_ImplSDL2_GetClipboardText(void*) +{ + ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData(); + if (bd->ClipboardTextData) + SDL_free(bd->ClipboardTextData); + bd->ClipboardTextData = SDL_GetClipboardText(); + return bd->ClipboardTextData; +} + +static void ImGui_ImplSDL2_SetClipboardText(void*, const char* text) +{ + SDL_SetClipboardText(text); +} + +static ImGuiKey ImGui_ImplSDL2_KeycodeToImGuiKey(int keycode) +{ + switch (keycode) + { + case SDLK_TAB: return ImGuiKey_Tab; + case SDLK_LEFT: return ImGuiKey_LeftArrow; + case SDLK_RIGHT: return ImGuiKey_RightArrow; + case SDLK_UP: return ImGuiKey_UpArrow; + case SDLK_DOWN: return ImGuiKey_DownArrow; + case SDLK_PAGEUP: return ImGuiKey_PageUp; + case SDLK_PAGEDOWN: return ImGuiKey_PageDown; + case SDLK_HOME: return ImGuiKey_Home; + case SDLK_END: return ImGuiKey_End; + case SDLK_INSERT: return ImGuiKey_Insert; + case SDLK_DELETE: return ImGuiKey_Delete; + case SDLK_BACKSPACE: return ImGuiKey_Backspace; + case SDLK_SPACE: return ImGuiKey_Space; + case SDLK_RETURN: return ImGuiKey_Enter; + case SDLK_ESCAPE: return ImGuiKey_Escape; + case SDLK_QUOTE: return ImGuiKey_Apostrophe; + case SDLK_COMMA: return ImGuiKey_Comma; + case SDLK_MINUS: return ImGuiKey_Minus; + case SDLK_PERIOD: return ImGuiKey_Period; + case SDLK_SLASH: return ImGuiKey_Slash; + case SDLK_SEMICOLON: return ImGuiKey_Semicolon; + case SDLK_EQUALS: return ImGuiKey_Equal; + case SDLK_LEFTBRACKET: return ImGuiKey_LeftBracket; + case SDLK_BACKSLASH: return ImGuiKey_Backslash; + case SDLK_RIGHTBRACKET: return ImGuiKey_RightBracket; + case SDLK_BACKQUOTE: return ImGuiKey_GraveAccent; + case SDLK_CAPSLOCK: return ImGuiKey_CapsLock; + case SDLK_SCROLLLOCK: return ImGuiKey_ScrollLock; + case SDLK_NUMLOCKCLEAR: return ImGuiKey_NumLock; + case SDLK_PRINTSCREEN: return ImGuiKey_PrintScreen; + case SDLK_PAUSE: return ImGuiKey_Pause; + case SDLK_KP_0: return ImGuiKey_Keypad0; + case SDLK_KP_1: return ImGuiKey_Keypad1; + case SDLK_KP_2: return ImGuiKey_Keypad2; + case SDLK_KP_3: return ImGuiKey_Keypad3; + case SDLK_KP_4: return ImGuiKey_Keypad4; + case SDLK_KP_5: return ImGuiKey_Keypad5; + case SDLK_KP_6: return ImGuiKey_Keypad6; + case SDLK_KP_7: return ImGuiKey_Keypad7; + case SDLK_KP_8: return ImGuiKey_Keypad8; + case SDLK_KP_9: return ImGuiKey_Keypad9; + case SDLK_KP_PERIOD: return ImGuiKey_KeypadDecimal; + case SDLK_KP_DIVIDE: return ImGuiKey_KeypadDivide; + case SDLK_KP_MULTIPLY: return ImGuiKey_KeypadMultiply; + case SDLK_KP_MINUS: return ImGuiKey_KeypadSubtract; + case SDLK_KP_PLUS: return ImGuiKey_KeypadAdd; + case SDLK_KP_ENTER: return ImGuiKey_KeypadEnter; + case SDLK_KP_EQUALS: return ImGuiKey_KeypadEqual; + case SDLK_LCTRL: return ImGuiKey_LeftCtrl; + case SDLK_LSHIFT: return ImGuiKey_LeftShift; + case SDLK_LALT: return ImGuiKey_LeftAlt; + case SDLK_LGUI: return ImGuiKey_LeftSuper; + case SDLK_RCTRL: return ImGuiKey_RightCtrl; + case SDLK_RSHIFT: return ImGuiKey_RightShift; + case SDLK_RALT: return ImGuiKey_RightAlt; + case SDLK_RGUI: return ImGuiKey_RightSuper; + case SDLK_APPLICATION: return ImGuiKey_Menu; + case SDLK_0: return ImGuiKey_0; + case SDLK_1: return ImGuiKey_1; + case SDLK_2: return ImGuiKey_2; + case SDLK_3: return ImGuiKey_3; + case SDLK_4: return ImGuiKey_4; + case SDLK_5: return ImGuiKey_5; + case SDLK_6: return ImGuiKey_6; + case SDLK_7: return ImGuiKey_7; + case SDLK_8: return ImGuiKey_8; + case SDLK_9: return ImGuiKey_9; + case SDLK_a: return ImGuiKey_A; + case SDLK_b: return ImGuiKey_B; + case SDLK_c: return ImGuiKey_C; + case SDLK_d: return ImGuiKey_D; + case SDLK_e: return ImGuiKey_E; + case SDLK_f: return ImGuiKey_F; + case SDLK_g: return ImGuiKey_G; + case SDLK_h: return ImGuiKey_H; + case SDLK_i: return ImGuiKey_I; + case SDLK_j: return ImGuiKey_J; + case SDLK_k: return ImGuiKey_K; + case SDLK_l: return ImGuiKey_L; + case SDLK_m: return ImGuiKey_M; + case SDLK_n: return ImGuiKey_N; + case SDLK_o: return ImGuiKey_O; + case SDLK_p: return ImGuiKey_P; + case SDLK_q: return ImGuiKey_Q; + case SDLK_r: return ImGuiKey_R; + case SDLK_s: return ImGuiKey_S; + case SDLK_t: return ImGuiKey_T; + case SDLK_u: return ImGuiKey_U; + case SDLK_v: return ImGuiKey_V; + case SDLK_w: return ImGuiKey_W; + case SDLK_x: return ImGuiKey_X; + case SDLK_y: return ImGuiKey_Y; + case SDLK_z: return ImGuiKey_Z; + case SDLK_F1: return ImGuiKey_F1; + case SDLK_F2: return ImGuiKey_F2; + case SDLK_F3: return ImGuiKey_F3; + case SDLK_F4: return ImGuiKey_F4; + case SDLK_F5: return ImGuiKey_F5; + case SDLK_F6: return ImGuiKey_F6; + case SDLK_F7: return ImGuiKey_F7; + case SDLK_F8: return ImGuiKey_F8; + case SDLK_F9: return ImGuiKey_F9; + case SDLK_F10: return ImGuiKey_F10; + case SDLK_F11: return ImGuiKey_F11; + case SDLK_F12: return ImGuiKey_F12; + } + return ImGuiKey_None; +} + +static void ImGui_ImplSDL2_UpdateKeyModifiers(SDL_Keymod sdl_key_mods) +{ + ImGuiIO& io = ImGui::GetIO(); + io.AddKeyEvent(ImGuiMod_Ctrl, (sdl_key_mods & KMOD_CTRL) != 0); + io.AddKeyEvent(ImGuiMod_Shift, (sdl_key_mods & KMOD_SHIFT) != 0); + io.AddKeyEvent(ImGuiMod_Alt, (sdl_key_mods & KMOD_ALT) != 0); + io.AddKeyEvent(ImGuiMod_Super, (sdl_key_mods & KMOD_GUI) != 0); +} + +// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs. +// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data. +// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data. +// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags. +// If you have multiple SDL events and some of them are not meant to be used by dear imgui, you may need to filter events based on their windowID field. +bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event) +{ + ImGuiIO& io = ImGui::GetIO(); + ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData(); + + switch (event->type) + { + case SDL_MOUSEMOTION: + { + io.AddMousePosEvent((float)event->motion.x, (float)event->motion.y); + return true; + } + case SDL_MOUSEWHEEL: + { + float wheel_x = (event->wheel.x > 0) ? 1.0f : (event->wheel.x < 0) ? -1.0f : 0.0f; + float wheel_y = (event->wheel.y > 0) ? 1.0f : (event->wheel.y < 0) ? -1.0f : 0.0f; + io.AddMouseWheelEvent(wheel_x, wheel_y); + return true; + } + case SDL_MOUSEBUTTONDOWN: + case SDL_MOUSEBUTTONUP: + { + int mouse_button = -1; + if (event->button.button == SDL_BUTTON_LEFT) { mouse_button = 0; } + if (event->button.button == SDL_BUTTON_RIGHT) { mouse_button = 1; } + if (event->button.button == SDL_BUTTON_MIDDLE) { mouse_button = 2; } + if (event->button.button == SDL_BUTTON_X1) { mouse_button = 3; } + if (event->button.button == SDL_BUTTON_X2) { mouse_button = 4; } + if (mouse_button == -1) + break; + io.AddMouseButtonEvent(mouse_button, (event->type == SDL_MOUSEBUTTONDOWN)); + bd->MouseButtonsDown = (event->type == SDL_MOUSEBUTTONDOWN) ? (bd->MouseButtonsDown | (1 << mouse_button)) : (bd->MouseButtonsDown & ~(1 << mouse_button)); + return true; + } + case SDL_TEXTINPUT: + { + io.AddInputCharactersUTF8(event->text.text); + return true; + } + case SDL_KEYDOWN: + case SDL_KEYUP: + { + ImGui_ImplSDL2_UpdateKeyModifiers((SDL_Keymod)event->key.keysym.mod); + ImGuiKey key = ImGui_ImplSDL2_KeycodeToImGuiKey(event->key.keysym.sym); + io.AddKeyEvent(key, (event->type == SDL_KEYDOWN)); + io.SetKeyEventNativeData(key, event->key.keysym.sym, event->key.keysym.scancode, event->key.keysym.scancode); // To support legacy indexing (<1.87 user code). Legacy backend uses SDLK_*** as indices to IsKeyXXX() functions. + return true; + } + case SDL_WINDOWEVENT: + { + // - When capturing mouse, SDL will send a bunch of conflicting LEAVE/ENTER event on every mouse move, but the final ENTER tends to be right. + // - However we won't get a correct LEAVE event for a captured window. + // - In some cases, when detaching a window from main viewport SDL may send SDL_WINDOWEVENT_ENTER one frame too late, + // causing SDL_WINDOWEVENT_LEAVE on previous frame to interrupt drag operation by clear mouse position. This is why + // we delay process the SDL_WINDOWEVENT_LEAVE events by one frame. See issue #5012 for details. + Uint8 window_event = event->window.event; + if (window_event == SDL_WINDOWEVENT_ENTER) + bd->PendingMouseLeaveFrame = 0; + if (window_event == SDL_WINDOWEVENT_LEAVE) + bd->PendingMouseLeaveFrame = ImGui::GetFrameCount() + 1; + if (window_event == SDL_WINDOWEVENT_FOCUS_GAINED) + io.AddFocusEvent(true); + else if (event->window.event == SDL_WINDOWEVENT_FOCUS_LOST) + io.AddFocusEvent(false); + return true; + } + } + return false; +} + +static bool ImGui_ImplSDL2_Init(SDL_Window* window, SDL_Renderer* renderer) +{ + ImGuiIO& io = ImGui::GetIO(); + IM_ASSERT(io.BackendPlatformUserData == nullptr && "Already initialized a platform backend!"); + + // Check and store if we are on a SDL backend that supports global mouse position + // ("wayland" and "rpi" don't support it, but we chose to use a white-list instead of a black-list) + bool mouse_can_use_global_state = false; +#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE + const char* sdl_backend = SDL_GetCurrentVideoDriver(); + const char* global_mouse_whitelist[] = { "windows", "cocoa", "x11", "DIVE", "VMAN" }; + for (int n = 0; n < IM_ARRAYSIZE(global_mouse_whitelist); n++) + if (strncmp(sdl_backend, global_mouse_whitelist[n], strlen(global_mouse_whitelist[n])) == 0) + mouse_can_use_global_state = true; +#endif + + // Setup backend capabilities flags + ImGui_ImplSDL2_Data* bd = IM_NEW(ImGui_ImplSDL2_Data)(); + io.BackendPlatformUserData = (void*)bd; + io.BackendPlatformName = "imgui_impl_sdl"; + io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional) + io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos; // We can honor io.WantSetMousePos requests (optional, rarely used) + + bd->Window = window; + bd->Renderer = renderer; + bd->MouseCanUseGlobalState = mouse_can_use_global_state; + + io.SetClipboardTextFn = ImGui_ImplSDL2_SetClipboardText; + io.GetClipboardTextFn = ImGui_ImplSDL2_GetClipboardText; + io.ClipboardUserData = nullptr; + + // Load mouse cursors + bd->MouseCursors[ImGuiMouseCursor_Arrow] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW); + bd->MouseCursors[ImGuiMouseCursor_TextInput] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_IBEAM); + bd->MouseCursors[ImGuiMouseCursor_ResizeAll] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEALL); + bd->MouseCursors[ImGuiMouseCursor_ResizeNS] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENS); + bd->MouseCursors[ImGuiMouseCursor_ResizeEW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEWE); + bd->MouseCursors[ImGuiMouseCursor_ResizeNESW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENESW); + bd->MouseCursors[ImGuiMouseCursor_ResizeNWSE] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENWSE); + bd->MouseCursors[ImGuiMouseCursor_Hand] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_HAND); + bd->MouseCursors[ImGuiMouseCursor_NotAllowed] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_NO); + + // Set platform dependent data in viewport +#ifdef _WIN32 + SDL_SysWMinfo info; + SDL_VERSION(&info.version); + if (SDL_GetWindowWMInfo(window, &info)) + ImGui::GetMainViewport()->PlatformHandleRaw = (void*)info.info.win.window; +#else + (void)window; +#endif + + // From 2.0.5: Set SDL hint to receive mouse click events on window focus, otherwise SDL doesn't emit the event. + // Without this, when clicking to gain focus, our widgets wouldn't activate even though they showed as hovered. + // (This is unfortunately a global SDL setting, so enabling it might have a side-effect on your application. + // It is unlikely to make a difference, but if your app absolutely needs to ignore the initial on-focus click: + // you can ignore SDL_MOUSEBUTTONDOWN events coming right after a SDL_WINDOWEVENT_FOCUS_GAINED) +#ifdef SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH + SDL_SetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, "1"); +#endif + + // From 2.0.22: Disable auto-capture, this is preventing drag and drop across multiple windows (see #5710) +#ifdef SDL_HINT_MOUSE_AUTO_CAPTURE + SDL_SetHint(SDL_HINT_MOUSE_AUTO_CAPTURE, "0"); +#endif + + return true; +} + +bool ImGui_ImplSDL2_InitForOpenGL(SDL_Window* window, void* sdl_gl_context) +{ + IM_UNUSED(sdl_gl_context); // Viewport branch will need this. + return ImGui_ImplSDL2_Init(window, nullptr); +} + +bool ImGui_ImplSDL2_InitForVulkan(SDL_Window* window) +{ +#if !SDL_HAS_VULKAN + IM_ASSERT(0 && "Unsupported"); +#endif + return ImGui_ImplSDL2_Init(window, nullptr); +} + +bool ImGui_ImplSDL2_InitForD3D(SDL_Window* window) +{ +#if !defined(_WIN32) + IM_ASSERT(0 && "Unsupported"); +#endif + return ImGui_ImplSDL2_Init(window, nullptr); +} + +bool ImGui_ImplSDL2_InitForMetal(SDL_Window* window) +{ + return ImGui_ImplSDL2_Init(window, nullptr); +} + +bool ImGui_ImplSDL2_InitForSDLRenderer(SDL_Window* window, SDL_Renderer* renderer) +{ + return ImGui_ImplSDL2_Init(window, renderer); +} + +void ImGui_ImplSDL2_Shutdown() +{ + ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData(); + IM_ASSERT(bd != nullptr && "No platform backend to shutdown, or already shutdown?"); + ImGuiIO& io = ImGui::GetIO(); + + if (bd->ClipboardTextData) + SDL_free(bd->ClipboardTextData); + for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++) + SDL_FreeCursor(bd->MouseCursors[cursor_n]); + + io.BackendPlatformName = nullptr; + io.BackendPlatformUserData = nullptr; + IM_DELETE(bd); +} + +static void ImGui_ImplSDL2_UpdateMouseData() +{ + ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData(); + ImGuiIO& io = ImGui::GetIO(); + + // We forward mouse input when hovered or captured (via SDL_MOUSEMOTION) or when focused (below) +#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE + // SDL_CaptureMouse() let the OS know e.g. that our imgui drag outside the SDL window boundaries shouldn't e.g. trigger other operations outside + SDL_CaptureMouse((bd->MouseButtonsDown != 0 && ImGui::GetDragDropPayload() == nullptr) ? SDL_TRUE : SDL_FALSE); + SDL_Window* focused_window = SDL_GetKeyboardFocus(); + const bool is_app_focused = (bd->Window == focused_window); +#else + const bool is_app_focused = (SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_INPUT_FOCUS) != 0; // SDL 2.0.3 and non-windowed systems: single-viewport only +#endif + if (is_app_focused) + { + // (Optional) Set OS mouse position from Dear ImGui if requested (rarely used, only when ImGuiConfigFlags_NavEnableSetMousePos is enabled by user) + if (io.WantSetMousePos) + SDL_WarpMouseInWindow(bd->Window, (int)io.MousePos.x, (int)io.MousePos.y); + + // (Optional) Fallback to provide mouse position when focused (SDL_MOUSEMOTION already provides this when hovered or captured) + if (bd->MouseCanUseGlobalState && bd->MouseButtonsDown == 0) + { + int window_x, window_y, mouse_x_global, mouse_y_global; + SDL_GetGlobalMouseState(&mouse_x_global, &mouse_y_global); + SDL_GetWindowPosition(bd->Window, &window_x, &window_y); + io.AddMousePosEvent((float)(mouse_x_global - window_x), (float)(mouse_y_global - window_y)); + } + } +} + +static void ImGui_ImplSDL2_UpdateMouseCursor() +{ + ImGuiIO& io = ImGui::GetIO(); + if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange) + return; + ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData(); + + ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor(); + if (io.MouseDrawCursor || imgui_cursor == ImGuiMouseCursor_None) + { + // Hide OS mouse cursor if imgui is drawing it or if it wants no cursor + SDL_ShowCursor(SDL_FALSE); + } + else + { + // Show OS mouse cursor + SDL_SetCursor(bd->MouseCursors[imgui_cursor] ? bd->MouseCursors[imgui_cursor] : bd->MouseCursors[ImGuiMouseCursor_Arrow]); + SDL_ShowCursor(SDL_TRUE); + } +} + +static void ImGui_ImplSDL2_UpdateGamepads() +{ + ImGuiIO& io = ImGui::GetIO(); + if ((io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) == 0) // FIXME: Technically feeding gamepad shouldn't depend on this now that they are regular inputs. + return; + + // Get gamepad + io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad; + SDL_GameController* game_controller = SDL_GameControllerOpen(0); + if (!game_controller) + return; + io.BackendFlags |= ImGuiBackendFlags_HasGamepad; + + // Update gamepad inputs + #define IM_SATURATE(V) (V < 0.0f ? 0.0f : V > 1.0f ? 1.0f : V) + #define MAP_BUTTON(KEY_NO, BUTTON_NO) { io.AddKeyEvent(KEY_NO, SDL_GameControllerGetButton(game_controller, BUTTON_NO) != 0); } + #define MAP_ANALOG(KEY_NO, AXIS_NO, V0, V1) { float vn = (float)(SDL_GameControllerGetAxis(game_controller, AXIS_NO) - V0) / (float)(V1 - V0); vn = IM_SATURATE(vn); io.AddKeyAnalogEvent(KEY_NO, vn > 0.1f, vn); } + const int thumb_dead_zone = 8000; // SDL_gamecontroller.h suggests using this value. + MAP_BUTTON(ImGuiKey_GamepadStart, SDL_CONTROLLER_BUTTON_START); + MAP_BUTTON(ImGuiKey_GamepadBack, SDL_CONTROLLER_BUTTON_BACK); + MAP_BUTTON(ImGuiKey_GamepadFaceLeft, SDL_CONTROLLER_BUTTON_X); // Xbox X, PS Square + MAP_BUTTON(ImGuiKey_GamepadFaceRight, SDL_CONTROLLER_BUTTON_B); // Xbox B, PS Circle + MAP_BUTTON(ImGuiKey_GamepadFaceUp, SDL_CONTROLLER_BUTTON_Y); // Xbox Y, PS Triangle + MAP_BUTTON(ImGuiKey_GamepadFaceDown, SDL_CONTROLLER_BUTTON_A); // Xbox A, PS Cross + MAP_BUTTON(ImGuiKey_GamepadDpadLeft, SDL_CONTROLLER_BUTTON_DPAD_LEFT); + MAP_BUTTON(ImGuiKey_GamepadDpadRight, SDL_CONTROLLER_BUTTON_DPAD_RIGHT); + MAP_BUTTON(ImGuiKey_GamepadDpadUp, SDL_CONTROLLER_BUTTON_DPAD_UP); + MAP_BUTTON(ImGuiKey_GamepadDpadDown, SDL_CONTROLLER_BUTTON_DPAD_DOWN); + MAP_BUTTON(ImGuiKey_GamepadL1, SDL_CONTROLLER_BUTTON_LEFTSHOULDER); + MAP_BUTTON(ImGuiKey_GamepadR1, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER); + MAP_ANALOG(ImGuiKey_GamepadL2, SDL_CONTROLLER_AXIS_TRIGGERLEFT, 0.0f, 32767); + MAP_ANALOG(ImGuiKey_GamepadR2, SDL_CONTROLLER_AXIS_TRIGGERRIGHT, 0.0f, 32767); + MAP_BUTTON(ImGuiKey_GamepadL3, SDL_CONTROLLER_BUTTON_LEFTSTICK); + MAP_BUTTON(ImGuiKey_GamepadR3, SDL_CONTROLLER_BUTTON_RIGHTSTICK); + MAP_ANALOG(ImGuiKey_GamepadLStickLeft, SDL_CONTROLLER_AXIS_LEFTX, -thumb_dead_zone, -32768); + MAP_ANALOG(ImGuiKey_GamepadLStickRight, SDL_CONTROLLER_AXIS_LEFTX, +thumb_dead_zone, +32767); + MAP_ANALOG(ImGuiKey_GamepadLStickUp, SDL_CONTROLLER_AXIS_LEFTY, -thumb_dead_zone, -32768); + MAP_ANALOG(ImGuiKey_GamepadLStickDown, SDL_CONTROLLER_AXIS_LEFTY, +thumb_dead_zone, +32767); + MAP_ANALOG(ImGuiKey_GamepadRStickLeft, SDL_CONTROLLER_AXIS_RIGHTX, -thumb_dead_zone, -32768); + MAP_ANALOG(ImGuiKey_GamepadRStickRight, SDL_CONTROLLER_AXIS_RIGHTX, +thumb_dead_zone, +32767); + MAP_ANALOG(ImGuiKey_GamepadRStickUp, SDL_CONTROLLER_AXIS_RIGHTY, -thumb_dead_zone, -32768); + MAP_ANALOG(ImGuiKey_GamepadRStickDown, SDL_CONTROLLER_AXIS_RIGHTY, +thumb_dead_zone, +32767); + #undef MAP_BUTTON + #undef MAP_ANALOG +} + +void ImGui_ImplSDL2_NewFrame() +{ + ImGui_ImplSDL2_Data* bd = ImGui_ImplSDL2_GetBackendData(); + IM_ASSERT(bd != nullptr && "Did you call ImGui_ImplSDL2_Init()?"); + ImGuiIO& io = ImGui::GetIO(); + + // Setup display size (every frame to accommodate for window resizing) + int w, h; + int display_w, display_h; + SDL_GetWindowSize(bd->Window, &w, &h); + if (SDL_GetWindowFlags(bd->Window) & SDL_WINDOW_MINIMIZED) + w = h = 0; + if (bd->Renderer != nullptr) + SDL_GetRendererOutputSize(bd->Renderer, &display_w, &display_h); + else + SDL_GL_GetDrawableSize(bd->Window, &display_w, &display_h); + io.DisplaySize = ImVec2((float)w, (float)h); + if (w > 0 && h > 0) + io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h); + + // Setup time step (we don't use SDL_GetTicks() because it is using millisecond resolution) + static Uint64 frequency = SDL_GetPerformanceFrequency(); + Uint64 current_time = SDL_GetPerformanceCounter(); + io.DeltaTime = bd->Time > 0 ? (float)((double)(current_time - bd->Time) / frequency) : (float)(1.0f / 60.0f); + bd->Time = current_time; + + if (bd->PendingMouseLeaveFrame && bd->PendingMouseLeaveFrame >= ImGui::GetFrameCount() && bd->MouseButtonsDown == 0) + { + io.AddMousePosEvent(-FLT_MAX, -FLT_MAX); + bd->PendingMouseLeaveFrame = 0; + } + + ImGui_ImplSDL2_UpdateMouseData(); + ImGui_ImplSDL2_UpdateMouseCursor(); + + // Update game controllers (if enabled and available) + ImGui_ImplSDL2_UpdateGamepads(); +} diff --git a/libs/imgui/backends/imgui_impl_sdl.h b/libs/imgui/backends/imgui_impl_sdl.h new file mode 100644 index 0000000..37d0a0e --- /dev/null +++ b/libs/imgui/backends/imgui_impl_sdl.h @@ -0,0 +1,38 @@ +// dear imgui: Platform Backend for SDL2 +// This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..) +// (Info: SDL2 is a cross-platform general purpose library for handling windows, inputs, graphics context creation, etc.) + +// Implemented features: +// [X] Platform: Clipboard support. +// [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy SDL_SCANCODE_* values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set] +// [X] Platform: Gamepad support. Enabled with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'. +// [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. +// Missing features: +// [ ] Platform: SDL2 handling of IME under Windows appears to be broken and it explicitly disable the regular Windows IME. You can restore Windows IME by compiling SDL with SDL_DISABLE_WINDOWS_IME. + +// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. +// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need. +// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp. +// Read online: https://github.com/ocornut/imgui/tree/master/docs + +#pragma once +#include "imgui.h" // IMGUI_IMPL_API + +struct SDL_Window; +struct SDL_Renderer; +typedef union SDL_Event SDL_Event; + +extern "C" { + IMGUI_IMPL_API bool ImGui_ImplSDL2_InitForOpenGL(SDL_Window* window, void* sdl_gl_context); + IMGUI_IMPL_API bool ImGui_ImplSDL2_InitForVulkan(SDL_Window* window); + IMGUI_IMPL_API bool ImGui_ImplSDL2_InitForD3D(SDL_Window* window); + IMGUI_IMPL_API bool ImGui_ImplSDL2_InitForMetal(SDL_Window* window); + IMGUI_IMPL_API bool ImGui_ImplSDL2_InitForSDLRenderer(SDL_Window* window, SDL_Renderer* renderer); + IMGUI_IMPL_API void ImGui_ImplSDL2_Shutdown(); + IMGUI_IMPL_API void ImGui_ImplSDL2_NewFrame(); + IMGUI_IMPL_API bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event); +} + +#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS +static inline void ImGui_ImplSDL2_NewFrame(SDL_Window*) { ImGui_ImplSDL2_NewFrame(); } // 1.84: removed unnecessary parameter +#endif diff --git a/src/backend_sdl2_opengl.zig b/src/backend_sdl2_opengl.zig new file mode 100644 index 0000000..7eeb081 --- /dev/null +++ b/src/backend_sdl2_opengl.zig @@ -0,0 +1,42 @@ +const zgui = @import("gui.zig"); + +const SDL_GL_Context = *anyopaque; + +pub fn init(window: *anyopaque, context: SDL_GL_Context, glsl_version: []const u8) void { + if (!ImGui_ImplSDL2_InitForOpenGL(window, context)) unreachable; + if (!ImGui_ImplOpenGL3_Init(glsl_version.ptr)) unreachable; +} + +pub fn deinit() void { + ImGui_ImplOpenGL3_Shutdown(); + ImGui_ImplSDL2_Shutdown(); +} + +pub fn newFrame(width: f32, height: f32) void { + ImGui_ImplOpenGL3_NewFrame(); + ImGui_ImplSDL2_NewFrame(); + + zgui.io.setDisplaySize(width, height); + zgui.io.setDisplayFramebufferScale(1.0, 1.0); + + zgui.newFrame(); +} + +pub fn draw() void { + zgui.render(); + ImGui_ImplOpenGL3_RenderDrawData(zgui.getDrawData()); +} + +pub fn processEvent(event: *anyopaque) bool { + return ImGui_ImplSDL2_ProcessEvent(event); +} + +extern fn ImGui_ImplSDL2_InitForOpenGL(window: *anyopaque, sdl_gl_context: SDL_GL_Context) bool; +extern fn ImGui_ImplSDL2_Shutdown() void; +extern fn ImGui_ImplSDL2_NewFrame() void; +extern fn ImGui_ImplSDL2_ProcessEvent(event: *anyopaque) bool; + +extern fn ImGui_ImplOpenGL3_Init(glsl_version: [*]const u8) bool; +extern fn ImGui_ImplOpenGL3_Shutdown() void; +extern fn ImGui_ImplOpenGL3_NewFrame() void; +extern fn ImGui_ImplOpenGL3_RenderDrawData(draw_data: *anyopaque) void; diff --git a/src/gui.zig b/src/gui.zig index bb50585..32776bf 100644 --- a/src/gui.zig +++ b/src/gui.zig @@ -8,6 +8,7 @@ pub const plot = @import("plot.zig"); pub const backend = switch (@import("zgui_options").backend) { .glfw_wgpu => @import("backend_glfw_wgpu.zig"), .glfw_opengl3 => @import("backend_glfw_opengl.zig"), + .sdl2_opengl3 => @import("backend_sdl2_opengl.zig"), .win32_dx12 => .{}, // TODO: .no_backend => .{}, }; diff --git a/src/main.zig b/src/main.zig index 3c85326..1acaac4 100644 --- a/src/main.zig +++ b/src/main.zig @@ -10,6 +10,7 @@ pub usingnamespace @import("gui.zig"); pub const plot = @import("plot.zig"); pub const backend = switch (@import("zgui_options").backend) { .glfw_wgpu => @import("backend_glfw_wgpu.zig"), + .sdl2_opengl3 => @import("backend_sdl2_opengl.zig"), .win32_dx12 => .{}, // TODO: .no_backend => .{}, };