chore(gui): namespace the majority of interactions w/ OpenGL
This commit is contained in:
parent
f6527da948
commit
a5e636d9c5
330
src/platform.zig
330
src/platform.zig
|
|
@ -33,29 +33,12 @@ pub const Gui = struct {
|
|||
const Self = @This();
|
||||
const log = std.log.scoped(.Gui);
|
||||
|
||||
// zig fmt: off
|
||||
const vertices: [32]f32 = [_]f32{
|
||||
// Positions // Colours // Texture Coords
|
||||
1.0, -1.0, 0.0, 1.0, 0.0, 0.0, 1.0, 1.0, // Top Right
|
||||
1.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, // Bottom Right
|
||||
-1.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, // Bottom Left
|
||||
-1.0, -1.0, 0.0, 1.0, 1.0, 0.0, 0.0, 1.0, // Top Left
|
||||
};
|
||||
|
||||
const indices: [6]u32 = [_]u32{
|
||||
0, 1, 3, // First Triangle
|
||||
1, 2, 3, // Second Triangle
|
||||
};
|
||||
// zig fmt: on
|
||||
|
||||
window: *SDL.SDL_Window,
|
||||
ctx: SDL_GLContext,
|
||||
audio: Audio,
|
||||
|
||||
state: imgui.State,
|
||||
|
||||
allocator: Allocator,
|
||||
program_id: gl.GLuint,
|
||||
|
||||
pub fn init(allocator: Allocator, apu: *Apu, title_opt: ?*const [12]u8) !Self {
|
||||
if (SDL.SDL_Init(SDL.SDL_INIT_VIDEO | SDL.SDL_INIT_EVENTS | SDL.SDL_INIT_AUDIO) < 0) panic();
|
||||
|
|
@ -87,7 +70,6 @@ pub const Gui = struct {
|
|||
return Self{
|
||||
.window = window,
|
||||
.ctx = ctx,
|
||||
.program_id = try compileShaders(),
|
||||
.audio = Audio.init(apu),
|
||||
|
||||
.allocator = allocator,
|
||||
|
|
@ -103,7 +85,6 @@ pub const Gui = struct {
|
|||
zgui.plot.deinit();
|
||||
zgui.deinit();
|
||||
|
||||
gl.deleteProgram(self.program_id);
|
||||
SDL.SDL_GL_DeleteContext(self.ctx);
|
||||
SDL.SDL_DestroyWindow(self.window);
|
||||
SDL.SDL_Quit();
|
||||
|
|
@ -111,137 +92,6 @@ pub const Gui = struct {
|
|||
self.* = undefined;
|
||||
}
|
||||
|
||||
fn drawGbaTexture(self: *const Self, obj_ids: struct { GLuint, GLuint, GLuint }, tex_id: GLuint, buf: []const u8) void {
|
||||
gl.bindTexture(gl.TEXTURE_2D, tex_id);
|
||||
defer gl.bindTexture(gl.TEXTURE_2D, 0);
|
||||
|
||||
gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gba_width, gba_height, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, buf.ptr);
|
||||
|
||||
// Bind VAO, EBO. VBO not bound
|
||||
gl.bindVertexArray(obj_ids[0]); // VAO
|
||||
defer gl.bindVertexArray(0);
|
||||
|
||||
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, obj_ids[2]); // EBO
|
||||
defer gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0);
|
||||
|
||||
// Use compiled frag + vertex shader
|
||||
gl.useProgram(self.program_id);
|
||||
defer gl.useProgram(0);
|
||||
|
||||
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, null);
|
||||
}
|
||||
|
||||
fn compileShaders() !GLuint {
|
||||
const vert_shader = @embedFile("shader/pixelbuf.vert");
|
||||
const frag_shader = @embedFile("shader/pixelbuf.frag");
|
||||
|
||||
const vs = gl.createShader(gl.VERTEX_SHADER);
|
||||
defer gl.deleteShader(vs);
|
||||
|
||||
gl.shaderSource(vs, 1, &[_][*c]const u8{vert_shader}, 0);
|
||||
gl.compileShader(vs);
|
||||
|
||||
if (!shader.didCompile(vs)) return error.VertexCompileError;
|
||||
|
||||
const fs = gl.createShader(gl.FRAGMENT_SHADER);
|
||||
defer gl.deleteShader(fs);
|
||||
|
||||
gl.shaderSource(fs, 1, &[_][*c]const u8{frag_shader}, 0);
|
||||
gl.compileShader(fs);
|
||||
|
||||
if (!shader.didCompile(fs)) return error.FragmentCompileError;
|
||||
|
||||
const program = gl.createProgram();
|
||||
gl.attachShader(program, vs);
|
||||
gl.attachShader(program, fs);
|
||||
gl.linkProgram(program);
|
||||
|
||||
return program;
|
||||
}
|
||||
|
||||
// Returns the VAO ID since it's used in run()
|
||||
fn genBufferObjects() struct { GLuint, GLuint, GLuint } {
|
||||
var vao_id: GLuint = undefined;
|
||||
var vbo_id: GLuint = undefined;
|
||||
var ebo_id: GLuint = undefined;
|
||||
|
||||
gl.genVertexArrays(1, &vao_id);
|
||||
gl.genBuffers(1, &vbo_id);
|
||||
gl.genBuffers(1, &ebo_id);
|
||||
|
||||
gl.bindVertexArray(vao_id);
|
||||
defer gl.bindVertexArray(0);
|
||||
|
||||
gl.bindBuffer(gl.ARRAY_BUFFER, vbo_id);
|
||||
defer gl.bindBuffer(gl.ARRAY_BUFFER, 0);
|
||||
|
||||
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebo_id);
|
||||
defer gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0);
|
||||
|
||||
gl.bufferData(gl.ARRAY_BUFFER, @sizeOf(@TypeOf(vertices)), &vertices, gl.STATIC_DRAW);
|
||||
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, @sizeOf(@TypeOf(indices)), &indices, gl.STATIC_DRAW);
|
||||
|
||||
// Position
|
||||
gl.vertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), null); // lmao
|
||||
gl.enableVertexAttribArray(0);
|
||||
// Colour
|
||||
gl.vertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), @intToPtr(?*anyopaque, (3 * @sizeOf(f32))));
|
||||
gl.enableVertexAttribArray(1);
|
||||
// Texture Coord
|
||||
gl.vertexAttribPointer(2, 2, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), @intToPtr(?*anyopaque, (6 * @sizeOf(f32))));
|
||||
gl.enableVertexAttribArray(2);
|
||||
|
||||
return .{ vao_id, vbo_id, ebo_id };
|
||||
}
|
||||
|
||||
fn genGbaTexture(buf: []const u8) GLuint {
|
||||
var tex_id: GLuint = undefined;
|
||||
gl.genTextures(1, &tex_id);
|
||||
|
||||
gl.bindTexture(gl.TEXTURE_2D, tex_id);
|
||||
defer gl.bindTexture(gl.TEXTURE_2D, 0);
|
||||
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
|
||||
|
||||
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gba_width, gba_height, 0, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, buf.ptr);
|
||||
|
||||
return tex_id;
|
||||
}
|
||||
|
||||
fn genOutTexture() GLuint {
|
||||
var tex_id: GLuint = undefined;
|
||||
gl.genTextures(1, &tex_id);
|
||||
|
||||
gl.bindTexture(gl.TEXTURE_2D, tex_id);
|
||||
defer gl.bindTexture(gl.TEXTURE_2D, 0);
|
||||
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
|
||||
|
||||
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gba_width, gba_height, 0, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, null);
|
||||
|
||||
return tex_id;
|
||||
}
|
||||
|
||||
fn genFrameBufObject(tex_id: c_uint) !GLuint {
|
||||
var fbo_id: GLuint = undefined;
|
||||
gl.genFramebuffers(1, &fbo_id);
|
||||
|
||||
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo_id);
|
||||
defer gl.bindFramebuffer(gl.FRAMEBUFFER, 0);
|
||||
|
||||
gl.framebufferTexture(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, tex_id, 0);
|
||||
|
||||
const draw_buffers: [1]GLuint = .{gl.COLOR_ATTACHMENT0};
|
||||
gl.drawBuffers(1, &draw_buffers);
|
||||
|
||||
if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE)
|
||||
return error.FrameBufferObejctInitFailed;
|
||||
|
||||
return fbo_id;
|
||||
}
|
||||
|
||||
const RunOptions = struct {
|
||||
channel: *TwoWayChannel,
|
||||
tracker: ?*FpsTracker = null,
|
||||
|
|
@ -254,16 +104,20 @@ pub const Gui = struct {
|
|||
const tracker = opt.tracker;
|
||||
const channel = opt.channel;
|
||||
|
||||
const obj_ids = Self.genBufferObjects();
|
||||
defer gl.deleteBuffers(3, @as(*const [3]c_uint, &obj_ids));
|
||||
const objects = opengl_impl.createObjects();
|
||||
defer gl.deleteBuffers(3, @as(*const [3]GLuint, &.{ objects.vao, objects.vbo, objects.ebo }));
|
||||
|
||||
const emu_tex = Self.genGbaTexture(cpu.bus.ppu.framebuf.get(.Renderer));
|
||||
const out_tex = Self.genOutTexture();
|
||||
defer gl.deleteTextures(2, &[_]c_uint{ emu_tex, out_tex });
|
||||
const emu_tex = opengl_impl.createScreenTexture(cpu.bus.ppu.framebuf.get(.Renderer));
|
||||
const out_tex = opengl_impl.createOutputTexture();
|
||||
defer gl.deleteTextures(2, &[_]GLuint{ emu_tex, out_tex });
|
||||
|
||||
const fbo_id = try Self.genFrameBufObject(out_tex);
|
||||
const fbo_id = try opengl_impl.createFrameBuffer(out_tex);
|
||||
defer gl.deleteFramebuffers(1, &fbo_id);
|
||||
|
||||
// TODO: Support dynamically switching shaders?
|
||||
const prog_id = try opengl_impl.compileShaders();
|
||||
defer gl.deleteProgram(prog_id);
|
||||
|
||||
emu_loop: while (true) {
|
||||
// `quit` from RunOptions may be modified by the GDBSTUB thread,
|
||||
// so we want to recognize that it may change to `true` and exit the GUI thread
|
||||
|
|
@ -346,12 +200,12 @@ pub const Gui = struct {
|
|||
|
||||
const buf = cpu.bus.ppu.framebuf.get(.Renderer);
|
||||
gl.viewport(0, 0, gba_width, gba_height);
|
||||
self.drawGbaTexture(obj_ids, emu_tex, buf);
|
||||
opengl_impl.drawScreenTexture(emu_tex, prog_id, objects, buf);
|
||||
}
|
||||
|
||||
// Background Colour
|
||||
const size = zgui.io.getDisplaySize();
|
||||
gl.viewport(0, 0, @floatToInt(c_int, size[0]), @floatToInt(c_int, size[1]));
|
||||
gl.viewport(0, 0, @floatToInt(GLsizei, size[0]), @floatToInt(GLsizei, size[1]));
|
||||
gl.clearColor(0, 0, 0, 1.0);
|
||||
gl.clear(gl.COLOR_BUFFER_BIT);
|
||||
|
||||
|
|
@ -415,6 +269,160 @@ const Audio = struct {
|
|||
}
|
||||
};
|
||||
|
||||
fn panic() noreturn {
|
||||
const str = @as(?[*:0]const u8, SDL.SDL_GetError()) orelse "unknown error";
|
||||
@panic(std.mem.sliceTo(str, 0));
|
||||
}
|
||||
|
||||
const opengl_impl = struct {
|
||||
// zig fmt: off
|
||||
const vertices: [32]f32 = [_]f32{
|
||||
// Positions // Colours // Texture Coords
|
||||
1.0, -1.0, 0.0, 1.0, 0.0, 0.0, 1.0, 1.0, // Top Right
|
||||
1.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, // Bottom Right
|
||||
-1.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, // Bottom Left
|
||||
-1.0, -1.0, 0.0, 1.0, 1.0, 0.0, 0.0, 1.0, // Top Left
|
||||
};
|
||||
|
||||
const indices: [6]u32 = [_]u32{
|
||||
0, 1, 3, // First Triangle
|
||||
1, 2, 3, // Second Triangle
|
||||
};
|
||||
// zig fmt: on
|
||||
|
||||
const Objects = struct { vao: GLuint, vbo: GLuint, ebo: GLuint };
|
||||
|
||||
fn drawScreenTexture(tex_id: GLuint, prog_id: GLuint, ids: Objects, buf: []const u8) void {
|
||||
gl.bindTexture(gl.TEXTURE_2D, tex_id);
|
||||
defer gl.bindTexture(gl.TEXTURE_2D, 0);
|
||||
|
||||
gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gba_width, gba_height, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, buf.ptr);
|
||||
|
||||
// Bind VAO, EBO. VBO not bound
|
||||
gl.bindVertexArray(ids.vao); // VAO
|
||||
defer gl.bindVertexArray(0);
|
||||
|
||||
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ids.ebo); // EBO
|
||||
defer gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0);
|
||||
|
||||
// Use compiled frag + vertex shader
|
||||
gl.useProgram(prog_id);
|
||||
defer gl.useProgram(0);
|
||||
|
||||
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, null);
|
||||
}
|
||||
|
||||
fn compileShaders() !GLuint {
|
||||
const vert_shader = @embedFile("shader/pixelbuf.vert");
|
||||
const frag_shader = @embedFile("shader/pixelbuf.frag");
|
||||
|
||||
const vs = gl.createShader(gl.VERTEX_SHADER);
|
||||
defer gl.deleteShader(vs);
|
||||
|
||||
gl.shaderSource(vs, 1, &[_][*c]const u8{vert_shader}, 0);
|
||||
gl.compileShader(vs);
|
||||
|
||||
if (!shader.didCompile(vs)) return error.VertexCompileError;
|
||||
|
||||
const fs = gl.createShader(gl.FRAGMENT_SHADER);
|
||||
defer gl.deleteShader(fs);
|
||||
|
||||
gl.shaderSource(fs, 1, &[_][*c]const u8{frag_shader}, 0);
|
||||
gl.compileShader(fs);
|
||||
|
||||
if (!shader.didCompile(fs)) return error.FragmentCompileError;
|
||||
|
||||
const program = gl.createProgram();
|
||||
gl.attachShader(program, vs);
|
||||
gl.attachShader(program, fs);
|
||||
gl.linkProgram(program);
|
||||
|
||||
return program;
|
||||
}
|
||||
|
||||
// Returns the VAO ID since it's used in run()
|
||||
fn createObjects() Objects {
|
||||
var vao_id: GLuint = undefined;
|
||||
var vbo_id: GLuint = undefined;
|
||||
var ebo_id: GLuint = undefined;
|
||||
|
||||
gl.genVertexArrays(1, &vao_id);
|
||||
gl.genBuffers(1, &vbo_id);
|
||||
gl.genBuffers(1, &ebo_id);
|
||||
|
||||
gl.bindVertexArray(vao_id);
|
||||
defer gl.bindVertexArray(0);
|
||||
|
||||
gl.bindBuffer(gl.ARRAY_BUFFER, vbo_id);
|
||||
defer gl.bindBuffer(gl.ARRAY_BUFFER, 0);
|
||||
|
||||
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebo_id);
|
||||
defer gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0);
|
||||
|
||||
gl.bufferData(gl.ARRAY_BUFFER, @sizeOf(@TypeOf(vertices)), &vertices, gl.STATIC_DRAW);
|
||||
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, @sizeOf(@TypeOf(indices)), &indices, gl.STATIC_DRAW);
|
||||
|
||||
// Position
|
||||
gl.vertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), null); // lmao
|
||||
gl.enableVertexAttribArray(0);
|
||||
// Colour
|
||||
gl.vertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), @intToPtr(?*anyopaque, (3 * @sizeOf(f32))));
|
||||
gl.enableVertexAttribArray(1);
|
||||
// Texture Coord
|
||||
gl.vertexAttribPointer(2, 2, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), @intToPtr(?*anyopaque, (6 * @sizeOf(f32))));
|
||||
gl.enableVertexAttribArray(2);
|
||||
|
||||
return .{ .vao = vao_id, .vbo = vbo_id, .ebo = ebo_id };
|
||||
}
|
||||
|
||||
fn createScreenTexture(buf: []const u8) GLuint {
|
||||
var tex_id: GLuint = undefined;
|
||||
gl.genTextures(1, &tex_id);
|
||||
|
||||
gl.bindTexture(gl.TEXTURE_2D, tex_id);
|
||||
defer gl.bindTexture(gl.TEXTURE_2D, 0);
|
||||
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
|
||||
|
||||
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gba_width, gba_height, 0, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, buf.ptr);
|
||||
|
||||
return tex_id;
|
||||
}
|
||||
|
||||
fn createOutputTexture() GLuint {
|
||||
var tex_id: GLuint = undefined;
|
||||
gl.genTextures(1, &tex_id);
|
||||
|
||||
gl.bindTexture(gl.TEXTURE_2D, tex_id);
|
||||
defer gl.bindTexture(gl.TEXTURE_2D, 0);
|
||||
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
|
||||
|
||||
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gba_width, gba_height, 0, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, null);
|
||||
|
||||
return tex_id;
|
||||
}
|
||||
|
||||
fn createFrameBuffer(tex_id: GLuint) !GLuint {
|
||||
var fbo_id: GLuint = undefined;
|
||||
gl.genFramebuffers(1, &fbo_id);
|
||||
|
||||
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo_id);
|
||||
defer gl.bindFramebuffer(gl.FRAMEBUFFER, 0);
|
||||
|
||||
gl.framebufferTexture(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, tex_id, 0);
|
||||
|
||||
const draw_buffers: [1]GLuint = .{gl.COLOR_ATTACHMENT0};
|
||||
gl.drawBuffers(1, &draw_buffers);
|
||||
|
||||
if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE)
|
||||
return error.FrameBufferObejctInitFailed;
|
||||
|
||||
return fbo_id;
|
||||
}
|
||||
|
||||
const shader = struct {
|
||||
const Kind = enum { vertex, fragment };
|
||||
const log = std.log.scoped(.Shader);
|
||||
|
|
@ -436,8 +444,4 @@ const shader = struct {
|
|||
log.err("{s}", .{std.mem.sliceTo(&error_msg, 0)});
|
||||
}
|
||||
};
|
||||
|
||||
fn panic() noreturn {
|
||||
const str = @as(?[*:0]const u8, SDL.SDL_GetError()) orelse "unknown error";
|
||||
@panic(std.mem.sliceTo(str, 0));
|
||||
}
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue