chore(gui): namespace the majority of interactions w/ OpenGL
This commit is contained in:
parent
f6527da948
commit
a5e636d9c5
364
src/platform.zig
364
src/platform.zig
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@ -33,29 +33,12 @@ pub const Gui = struct {
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const Self = @This();
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const log = std.log.scoped(.Gui);
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// zig fmt: off
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const vertices: [32]f32 = [_]f32{
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// Positions // Colours // Texture Coords
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1.0, -1.0, 0.0, 1.0, 0.0, 0.0, 1.0, 1.0, // Top Right
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1.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, // Bottom Right
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-1.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, // Bottom Left
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-1.0, -1.0, 0.0, 1.0, 1.0, 0.0, 0.0, 1.0, // Top Left
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};
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const indices: [6]u32 = [_]u32{
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0, 1, 3, // First Triangle
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1, 2, 3, // Second Triangle
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};
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// zig fmt: on
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window: *SDL.SDL_Window,
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ctx: SDL_GLContext,
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audio: Audio,
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state: imgui.State,
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allocator: Allocator,
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program_id: gl.GLuint,
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pub fn init(allocator: Allocator, apu: *Apu, title_opt: ?*const [12]u8) !Self {
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if (SDL.SDL_Init(SDL.SDL_INIT_VIDEO | SDL.SDL_INIT_EVENTS | SDL.SDL_INIT_AUDIO) < 0) panic();
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@ -87,7 +70,6 @@ pub const Gui = struct {
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return Self{
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.window = window,
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.ctx = ctx,
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.program_id = try compileShaders(),
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.audio = Audio.init(apu),
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.allocator = allocator,
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@ -103,7 +85,6 @@ pub const Gui = struct {
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zgui.plot.deinit();
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zgui.deinit();
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gl.deleteProgram(self.program_id);
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SDL.SDL_GL_DeleteContext(self.ctx);
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SDL.SDL_DestroyWindow(self.window);
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SDL.SDL_Quit();
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@ -111,137 +92,6 @@ pub const Gui = struct {
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self.* = undefined;
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}
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fn drawGbaTexture(self: *const Self, obj_ids: struct { GLuint, GLuint, GLuint }, tex_id: GLuint, buf: []const u8) void {
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gl.bindTexture(gl.TEXTURE_2D, tex_id);
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defer gl.bindTexture(gl.TEXTURE_2D, 0);
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gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gba_width, gba_height, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, buf.ptr);
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// Bind VAO, EBO. VBO not bound
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gl.bindVertexArray(obj_ids[0]); // VAO
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defer gl.bindVertexArray(0);
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, obj_ids[2]); // EBO
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defer gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0);
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// Use compiled frag + vertex shader
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gl.useProgram(self.program_id);
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defer gl.useProgram(0);
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gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, null);
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}
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fn compileShaders() !GLuint {
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const vert_shader = @embedFile("shader/pixelbuf.vert");
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const frag_shader = @embedFile("shader/pixelbuf.frag");
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const vs = gl.createShader(gl.VERTEX_SHADER);
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defer gl.deleteShader(vs);
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gl.shaderSource(vs, 1, &[_][*c]const u8{vert_shader}, 0);
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gl.compileShader(vs);
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if (!shader.didCompile(vs)) return error.VertexCompileError;
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const fs = gl.createShader(gl.FRAGMENT_SHADER);
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defer gl.deleteShader(fs);
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gl.shaderSource(fs, 1, &[_][*c]const u8{frag_shader}, 0);
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gl.compileShader(fs);
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if (!shader.didCompile(fs)) return error.FragmentCompileError;
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const program = gl.createProgram();
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gl.attachShader(program, vs);
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gl.attachShader(program, fs);
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gl.linkProgram(program);
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return program;
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}
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// Returns the VAO ID since it's used in run()
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fn genBufferObjects() struct { GLuint, GLuint, GLuint } {
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var vao_id: GLuint = undefined;
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var vbo_id: GLuint = undefined;
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var ebo_id: GLuint = undefined;
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gl.genVertexArrays(1, &vao_id);
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gl.genBuffers(1, &vbo_id);
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gl.genBuffers(1, &ebo_id);
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gl.bindVertexArray(vao_id);
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defer gl.bindVertexArray(0);
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gl.bindBuffer(gl.ARRAY_BUFFER, vbo_id);
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defer gl.bindBuffer(gl.ARRAY_BUFFER, 0);
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebo_id);
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defer gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0);
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gl.bufferData(gl.ARRAY_BUFFER, @sizeOf(@TypeOf(vertices)), &vertices, gl.STATIC_DRAW);
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gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, @sizeOf(@TypeOf(indices)), &indices, gl.STATIC_DRAW);
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// Position
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gl.vertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), null); // lmao
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gl.enableVertexAttribArray(0);
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// Colour
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gl.vertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), @intToPtr(?*anyopaque, (3 * @sizeOf(f32))));
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gl.enableVertexAttribArray(1);
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// Texture Coord
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gl.vertexAttribPointer(2, 2, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), @intToPtr(?*anyopaque, (6 * @sizeOf(f32))));
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gl.enableVertexAttribArray(2);
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return .{ vao_id, vbo_id, ebo_id };
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}
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fn genGbaTexture(buf: []const u8) GLuint {
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var tex_id: GLuint = undefined;
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gl.genTextures(1, &tex_id);
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gl.bindTexture(gl.TEXTURE_2D, tex_id);
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defer gl.bindTexture(gl.TEXTURE_2D, 0);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gba_width, gba_height, 0, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, buf.ptr);
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return tex_id;
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}
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fn genOutTexture() GLuint {
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var tex_id: GLuint = undefined;
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gl.genTextures(1, &tex_id);
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gl.bindTexture(gl.TEXTURE_2D, tex_id);
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defer gl.bindTexture(gl.TEXTURE_2D, 0);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gba_width, gba_height, 0, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, null);
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return tex_id;
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}
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fn genFrameBufObject(tex_id: c_uint) !GLuint {
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var fbo_id: GLuint = undefined;
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gl.genFramebuffers(1, &fbo_id);
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gl.bindFramebuffer(gl.FRAMEBUFFER, fbo_id);
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defer gl.bindFramebuffer(gl.FRAMEBUFFER, 0);
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gl.framebufferTexture(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, tex_id, 0);
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const draw_buffers: [1]GLuint = .{gl.COLOR_ATTACHMENT0};
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gl.drawBuffers(1, &draw_buffers);
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if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE)
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return error.FrameBufferObejctInitFailed;
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return fbo_id;
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}
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const RunOptions = struct {
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channel: *TwoWayChannel,
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tracker: ?*FpsTracker = null,
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@ -254,16 +104,20 @@ pub const Gui = struct {
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const tracker = opt.tracker;
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const channel = opt.channel;
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const obj_ids = Self.genBufferObjects();
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defer gl.deleteBuffers(3, @as(*const [3]c_uint, &obj_ids));
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const objects = opengl_impl.createObjects();
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defer gl.deleteBuffers(3, @as(*const [3]GLuint, &.{ objects.vao, objects.vbo, objects.ebo }));
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const emu_tex = Self.genGbaTexture(cpu.bus.ppu.framebuf.get(.Renderer));
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const out_tex = Self.genOutTexture();
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defer gl.deleteTextures(2, &[_]c_uint{ emu_tex, out_tex });
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const emu_tex = opengl_impl.createScreenTexture(cpu.bus.ppu.framebuf.get(.Renderer));
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const out_tex = opengl_impl.createOutputTexture();
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defer gl.deleteTextures(2, &[_]GLuint{ emu_tex, out_tex });
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const fbo_id = try Self.genFrameBufObject(out_tex);
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const fbo_id = try opengl_impl.createFrameBuffer(out_tex);
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defer gl.deleteFramebuffers(1, &fbo_id);
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// TODO: Support dynamically switching shaders?
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const prog_id = try opengl_impl.compileShaders();
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defer gl.deleteProgram(prog_id);
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emu_loop: while (true) {
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// `quit` from RunOptions may be modified by the GDBSTUB thread,
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// so we want to recognize that it may change to `true` and exit the GUI thread
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@ -346,12 +200,12 @@ pub const Gui = struct {
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const buf = cpu.bus.ppu.framebuf.get(.Renderer);
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gl.viewport(0, 0, gba_width, gba_height);
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self.drawGbaTexture(obj_ids, emu_tex, buf);
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opengl_impl.drawScreenTexture(emu_tex, prog_id, objects, buf);
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}
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// Background Colour
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const size = zgui.io.getDisplaySize();
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gl.viewport(0, 0, @floatToInt(c_int, size[0]), @floatToInt(c_int, size[1]));
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gl.viewport(0, 0, @floatToInt(GLsizei, size[0]), @floatToInt(GLsizei, size[1]));
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gl.clearColor(0, 0, 0, 1.0);
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gl.clear(gl.COLOR_BUFFER_BIT);
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@ -415,29 +269,179 @@ const Audio = struct {
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}
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};
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const shader = struct {
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const Kind = enum { vertex, fragment };
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const log = std.log.scoped(.Shader);
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fn didCompile(id: gl.GLuint) bool {
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var success: gl.GLint = undefined;
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gl.getShaderiv(id, gl.COMPILE_STATUS, &success);
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if (success == 0) err(id);
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return success == 1;
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}
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fn err(id: gl.GLuint) void {
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const buf_len = 512;
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var error_msg: [buf_len]u8 = undefined;
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gl.getShaderInfoLog(id, buf_len, 0, &error_msg);
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log.err("{s}", .{std.mem.sliceTo(&error_msg, 0)});
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}
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};
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fn panic() noreturn {
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const str = @as(?[*:0]const u8, SDL.SDL_GetError()) orelse "unknown error";
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@panic(std.mem.sliceTo(str, 0));
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}
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const opengl_impl = struct {
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// zig fmt: off
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const vertices: [32]f32 = [_]f32{
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// Positions // Colours // Texture Coords
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1.0, -1.0, 0.0, 1.0, 0.0, 0.0, 1.0, 1.0, // Top Right
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1.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, // Bottom Right
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-1.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, // Bottom Left
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-1.0, -1.0, 0.0, 1.0, 1.0, 0.0, 0.0, 1.0, // Top Left
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};
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const indices: [6]u32 = [_]u32{
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0, 1, 3, // First Triangle
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1, 2, 3, // Second Triangle
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};
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// zig fmt: on
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const Objects = struct { vao: GLuint, vbo: GLuint, ebo: GLuint };
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fn drawScreenTexture(tex_id: GLuint, prog_id: GLuint, ids: Objects, buf: []const u8) void {
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gl.bindTexture(gl.TEXTURE_2D, tex_id);
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defer gl.bindTexture(gl.TEXTURE_2D, 0);
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gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gba_width, gba_height, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, buf.ptr);
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// Bind VAO, EBO. VBO not bound
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gl.bindVertexArray(ids.vao); // VAO
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defer gl.bindVertexArray(0);
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ids.ebo); // EBO
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defer gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0);
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// Use compiled frag + vertex shader
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gl.useProgram(prog_id);
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defer gl.useProgram(0);
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gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, null);
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}
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fn compileShaders() !GLuint {
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const vert_shader = @embedFile("shader/pixelbuf.vert");
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const frag_shader = @embedFile("shader/pixelbuf.frag");
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const vs = gl.createShader(gl.VERTEX_SHADER);
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defer gl.deleteShader(vs);
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gl.shaderSource(vs, 1, &[_][*c]const u8{vert_shader}, 0);
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gl.compileShader(vs);
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if (!shader.didCompile(vs)) return error.VertexCompileError;
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const fs = gl.createShader(gl.FRAGMENT_SHADER);
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defer gl.deleteShader(fs);
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gl.shaderSource(fs, 1, &[_][*c]const u8{frag_shader}, 0);
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gl.compileShader(fs);
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if (!shader.didCompile(fs)) return error.FragmentCompileError;
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const program = gl.createProgram();
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gl.attachShader(program, vs);
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gl.attachShader(program, fs);
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gl.linkProgram(program);
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return program;
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}
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// Returns the VAO ID since it's used in run()
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fn createObjects() Objects {
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var vao_id: GLuint = undefined;
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var vbo_id: GLuint = undefined;
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var ebo_id: GLuint = undefined;
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gl.genVertexArrays(1, &vao_id);
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gl.genBuffers(1, &vbo_id);
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gl.genBuffers(1, &ebo_id);
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gl.bindVertexArray(vao_id);
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defer gl.bindVertexArray(0);
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gl.bindBuffer(gl.ARRAY_BUFFER, vbo_id);
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defer gl.bindBuffer(gl.ARRAY_BUFFER, 0);
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebo_id);
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defer gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0);
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gl.bufferData(gl.ARRAY_BUFFER, @sizeOf(@TypeOf(vertices)), &vertices, gl.STATIC_DRAW);
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gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, @sizeOf(@TypeOf(indices)), &indices, gl.STATIC_DRAW);
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// Position
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gl.vertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), null); // lmao
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gl.enableVertexAttribArray(0);
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// Colour
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gl.vertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), @intToPtr(?*anyopaque, (3 * @sizeOf(f32))));
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gl.enableVertexAttribArray(1);
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// Texture Coord
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gl.vertexAttribPointer(2, 2, gl.FLOAT, gl.FALSE, 8 * @sizeOf(f32), @intToPtr(?*anyopaque, (6 * @sizeOf(f32))));
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gl.enableVertexAttribArray(2);
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return .{ .vao = vao_id, .vbo = vbo_id, .ebo = ebo_id };
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}
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fn createScreenTexture(buf: []const u8) GLuint {
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var tex_id: GLuint = undefined;
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gl.genTextures(1, &tex_id);
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gl.bindTexture(gl.TEXTURE_2D, tex_id);
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defer gl.bindTexture(gl.TEXTURE_2D, 0);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gba_width, gba_height, 0, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, buf.ptr);
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return tex_id;
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}
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fn createOutputTexture() GLuint {
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var tex_id: GLuint = undefined;
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gl.genTextures(1, &tex_id);
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gl.bindTexture(gl.TEXTURE_2D, tex_id);
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defer gl.bindTexture(gl.TEXTURE_2D, 0);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gba_width, gba_height, 0, gl.RGBA, gl.UNSIGNED_INT_8_8_8_8, null);
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return tex_id;
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}
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fn createFrameBuffer(tex_id: GLuint) !GLuint {
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var fbo_id: GLuint = undefined;
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gl.genFramebuffers(1, &fbo_id);
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gl.bindFramebuffer(gl.FRAMEBUFFER, fbo_id);
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defer gl.bindFramebuffer(gl.FRAMEBUFFER, 0);
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gl.framebufferTexture(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, tex_id, 0);
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const draw_buffers: [1]GLuint = .{gl.COLOR_ATTACHMENT0};
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gl.drawBuffers(1, &draw_buffers);
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if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE)
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return error.FrameBufferObejctInitFailed;
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return fbo_id;
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}
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const shader = struct {
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const Kind = enum { vertex, fragment };
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const log = std.log.scoped(.Shader);
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fn didCompile(id: gl.GLuint) bool {
|
||||
var success: gl.GLint = undefined;
|
||||
gl.getShaderiv(id, gl.COMPILE_STATUS, &success);
|
||||
|
||||
if (success == 0) err(id);
|
||||
|
||||
return success == 1;
|
||||
}
|
||||
|
||||
fn err(id: gl.GLuint) void {
|
||||
const buf_len = 512;
|
||||
var error_msg: [buf_len]u8 = undefined;
|
||||
|
||||
gl.getShaderInfoLog(id, buf_len, 0, &error_msg);
|
||||
log.err("{s}", .{std.mem.sliceTo(&error_msg, 0)});
|
||||
}
|
||||
};
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue