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feat: add imgui support using zgui

This commit is contained in:
Rekai Nyangadzayi Musuka 2023-01-01 03:42:02 -06:00
parent ed8155139a
commit 462121153e
6 changed files with 157 additions and 41 deletions
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4
.gitignore vendored
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@ -12,3 +12,7 @@
# Any Custom Scripts for Debugging purposes
*.sh
# Dear ImGui
**/imgui.ini

3
.gitmodules vendored
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@ -13,3 +13,6 @@
[submodule "lib/zig-toml"]
path = lib/zig-toml
url = https://github.com/aeronavery/zig-toml
[submodule "lib/zgui"]
path = lib/zgui
url = https://git.musuka.dev/paoda/zgui

9
build.zig
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@ -1,6 +1,8 @@
const std = @import("std");
const builtin = @import("builtin");
const Sdk = @import("lib/SDL.zig/Sdk.zig");
const zgui = @import("lib/zgui/build.zig");
pub fn build(b: *std.build.Builder) void {
// Minimum Zig Version
@ -46,6 +48,13 @@ pub fn build(b: *std.build.Builder) void {
sdk.link(exe, .dynamic);
exe.addPackage(sdk.getNativePackage("sdl2"));
// Dear ImGui bindings
const zgui_options = zgui.BuildOptionsStep.init(b, .{ .backend = .sdl2_opengl3 });
const zgui_pkg = zgui.getPkg(&.{zgui_options.getPkg()});
exe.addPackage(zgui_pkg);
zgui.link(exe, zgui_options);
exe.setBuildMode(mode);
exe.install();
const run_cmd = exe.run();

1
lib/zgui Submodule

@ -0,0 +1 @@
Subproject commit 7b01afc274db7231853dfd65c94dcd32f3f36b74

5
src/main.zig
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@ -13,8 +13,6 @@ const FilePaths = @import("util.zig").FilePaths;
const Allocator = std.mem.Allocator;
const log = std.log.scoped(.Cli);
const width = @import("core/ppu.zig").width;
const height = @import("core/ppu.zig").height;
pub const log_level = if (builtin.mode != .Debug) .info else std.log.default_level;
// CLI Arguments + Help Text
@ -87,7 +85,8 @@ pub fn main() void {
cpu.fastBoot();
}
var gui = Gui.init(&bus.pak.title, &bus.apu, width, height) catch |e| exitln("failed to init gui: {}", .{e});
// TODO: Just copy the title instead of grabbing a pointer to it
var gui = Gui.init(allocator, &bus.pak.title, &bus.apu) catch |e| exitln("failed to init gui: {}", .{e});
defer gui.deinit();
gui.run(&cpu, &scheduler) catch |e| exitln("failed to run gui thread: {}", .{e});

174
src/platform.zig
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@ -1,6 +1,8 @@
const std = @import("std");
const SDL = @import("sdl2");
const gl = @import("gl");
const zgui = @import("zgui");
const emu = @import("core/emu.zig");
const config = @import("config.zig");
@ -12,6 +14,14 @@ const FpsTracker = @import("util.zig").FpsTracker;
const gba_width = @import("core/ppu.zig").width;
const gba_height = @import("core/ppu.zig").height;
const GLuint = gl.GLuint;
const GLsizei = gl.GLsizei;
const SDL_GLContext = *anyopaque;
const Allocator = std.mem.Allocator;
const width = 1280;
const height = 720;
pub const sample_rate = 1 << 15;
pub const sample_format = SDL.AUDIO_U16;
@ -19,7 +29,6 @@ const default_title = "ZBA";
pub const Gui = struct {
const Self = @This();
const SDL_GLContext = *anyopaque; // SDL.SDL_GLContext is a ?*anyopaque
const log = std.log.scoped(.Gui);
// zig fmt: off
@ -44,20 +53,20 @@ pub const Gui = struct {
program_id: gl.GLuint,
pub fn init(title: *const [12]u8, apu: *Apu, width: i32, height: i32) !Self {
pub fn init(allocator: Allocator, title: *const [12]u8, apu: *Apu) !Self {
if (SDL.SDL_Init(SDL.SDL_INIT_VIDEO | SDL.SDL_INIT_EVENTS | SDL.SDL_INIT_AUDIO) < 0) panic();
if (SDL.SDL_GL_SetAttribute(SDL.SDL_GL_CONTEXT_PROFILE_MASK, SDL.SDL_GL_CONTEXT_PROFILE_CORE) < 0) panic();
if (SDL.SDL_GL_SetAttribute(SDL.SDL_GL_CONTEXT_MAJOR_VERSION, 3) < 0) panic();
if (SDL.SDL_GL_SetAttribute(SDL.SDL_GL_CONTEXT_MAJOR_VERSION, 3) < 0) panic();
const win_scale = @intCast(c_int, config.config().host.win_scale);
// const win_scale = @intCast(c_int, config.config().host.win_scale);
const window = SDL.SDL_CreateWindow(
default_title,
SDL.SDL_WINDOWPOS_CENTERED,
SDL.SDL_WINDOWPOS_CENTERED,
@as(c_int, width * win_scale),
@as(c_int, height * win_scale),
width,
height,
SDL.SDL_WINDOW_OPENGL | SDL.SDL_WINDOW_SHOWN,
) orelse panic();
@ -67,19 +76,39 @@ pub const Gui = struct {
gl.load(ctx, Self.glGetProcAddress) catch {};
if (SDL.SDL_GL_SetSwapInterval(@boolToInt(config.config().host.vsync)) < 0) panic();
const program_id = try compileShaders();
zgui.init(allocator);
zgui.backend.init(window, ctx, "#version 330 core");
return Self{
.window = window,
.title = std.mem.sliceTo(title, 0),
.ctx = ctx,
.program_id = program_id,
.program_id = try compileShaders(),
.audio = Audio.init(apu),
};
}
fn compileShaders() !gl.GLuint {
// TODO: Panic on Shader Compiler Failure + Error Message
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");
@ -108,20 +137,25 @@ pub const Gui = struct {
}
// Returns the VAO ID since it's used in run()
fn generateBuffers() struct { c_uint, c_uint, c_uint } {
var vao_id: c_uint = undefined;
var vbo_id: c_uint = undefined;
var ebo_id: c_uint = undefined;
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);
gl.bufferData(gl.ARRAY_BUFFER, @sizeOf(@TypeOf(vertices)), &vertices, gl.STATIC_DRAW);
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
@ -137,38 +171,86 @@ pub const Gui = struct {
return .{ vao_id, vbo_id, ebo_id };
}
fn generateTexture(buf: []const u8) c_uint {
var tex_id: c_uint = undefined;
fn genGbaTexture(buf: []const u8) GLuint {
var tex_id: GLuint = undefined;
gl.genTextures(1, &tex_id);
gl.bindTexture(gl.TEXTURE_2D, tex_id);
// gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
// gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
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);
// gl.generateMipmap(gl.TEXTURE_2D); // TODO: Remove?
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;
}
fn draw(self: *Self, tex_id: GLuint) void {
_ = self;
{
_ = zgui.begin("Game Boy Advance Screen", .{ .flags = .{ .no_resize = true } });
defer zgui.end();
const args = .{
.w = gba_width,
.h = gba_height,
.uv0 = .{ 0.0, 1.0 },
.uv1 = .{ 1.0, 0.0 },
};
zgui.image(@intToPtr(*anyopaque, tex_id), args);
}
}
pub fn run(self: *Self, cpu: *Arm7tdmi, scheduler: *Scheduler) !void {
const obj_ids = Self.genBufferObjects();
defer gl.deleteBuffers(3, @as(*const [3]c_uint, &obj_ids));
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 fbo_id = try Self.genFrameBufObject(out_tex);
defer gl.deleteFramebuffers(1, &fbo_id);
var quit = std.atomic.Atomic(bool).init(false);
var tracker = FpsTracker.init();
var buffer_ids = Self.generateBuffers();
defer {
gl.deleteBuffers(1, &buffer_ids[2]); // EBO
gl.deleteBuffers(1, &buffer_ids[1]); // VBO
gl.deleteVertexArrays(1, &buffer_ids[0]); // VAO
}
const vao_id = buffer_ids[0];
const tex_id = Self.generateTexture(cpu.bus.ppu.framebuf.get(.Renderer));
defer gl.deleteTextures(1, &tex_id);
const thread = try std.Thread.spawn(.{}, emu.run, .{ &quit, scheduler, cpu, &tracker });
defer thread.join();
@ -177,6 +259,8 @@ pub const Gui = struct {
emu_loop: while (true) {
var event: SDL.SDL_Event = undefined;
while (SDL.SDL_PollEvent(&event) != 0) {
_ = zgui.backend.processEvent(&event);
switch (event.type) {
SDL.SDL_QUIT => break :emu_loop,
SDL.SDL_KEYDOWN => {
@ -229,13 +313,25 @@ pub const Gui = struct {
}
}
// Emulator has an internal Double Buffer
const framebuf = cpu.bus.ppu.framebuf.get(.Renderer);
gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gba_width, gba_height, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, framebuf.ptr);
{
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo_id);
defer gl.bindFramebuffer(gl.FRAMEBUFFER, 0);
const buf = cpu.bus.ppu.framebuf.get(.Renderer);
gl.viewport(0, 0, gba_width, gba_height);
self.drawGbaTexture(obj_ids, emu_tex, buf);
}
// Background
const size = zgui.io.getDisplaySize();
gl.viewport(0, 0, @floatToInt(c_int, size[0]), @floatToInt(c_int, size[1]));
gl.clearColor(0, 0, 0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
zgui.backend.newFrame(width, height);
self.draw(out_tex);
zgui.backend.draw();
gl.useProgram(self.program_id);
gl.bindVertexArray(vao_id);
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, null);
SDL.SDL_GL_SwapWindow(self.window);
const dyn_title = std.fmt.bufPrintZ(&title_buf, "ZBA | {s} [Emu: {}fps] ", .{ self.title, tracker.value() }) catch unreachable;
@ -247,6 +343,10 @@ pub const Gui = struct {
pub fn deinit(self: *Self) void {
self.audio.deinit();
zgui.backend.deinit();
zgui.deinit();
gl.deleteProgram(self.program_id);
SDL.SDL_GL_DeleteContext(self.ctx);
SDL.SDL_DestroyWindow(self.window);