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base: paoda:26dba16789d54d7cae182c0ab9eec4e39a2b63ee
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paoda:main
paoda:april-fools
paoda:window
paoda:apu-things
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compare: paoda:250ff25ed77a1c848b1a80fde3c688be7ca98cc3
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paoda:main
paoda:april-fools
paoda:window
paoda:apu-things

8 Commits
26dba16789 ... 250ff25ed7

Author SHA1 Message Date
Rekai Nyangadzayi Musuka 250ff25ed7 Merge pull request 'Configure SDL2 to use OpenGL' (#4) from opengl into main 
Reviewed-on: #4
 2022-10-20 01:41:50 +00:00
Rekai Nyangadzayi Musuka eff52ac1bb fix(opengl): properly control whether vsync is enabled 2022-10-17 20:31:42 -03:00
Rekai Nyangadzayi Musuka e60b556f72 chore(ppu): remove BGR555 -> RGBA888 LUT 
LUT probably couldn't fit in CPU cache anyways.

TODO: Consider whether LUTs for separate channels (size 32 * 3 * 3
instead of std.math.maxInt(u15))
 2022-10-17 20:31:42 -03:00
Rekai Nyangadzayi Musuka 3a3e6acc6a chore: replace OpenGL 4.5 bindings with OpenGL 3.3 2022-10-17 20:31:42 -03:00
Rekai Nyangadzayi Musuka 4b4bc7f894 chore: remove unnecessary ptr cast 2022-10-17 20:31:42 -03:00
Rekai Nyangadzayi Musuka 325208d460 feat: implement better Colour Emulation 2022-10-17 20:31:42 -03:00
Rekai Nyangadzayi Musuka f44a1a49fd fix: lower required OpenGL version + resolve offset bug 2022-10-17 20:31:42 -03:00
Rekai Nyangadzayi Musuka 1575f517a9 feat: use opengl 
TODO:
- Texture isn't scaling properly
- I need to reverse the colours in the frag shader
 2022-10-17 20:31:42 -03:00
6 changed files with 5201 additions and 64 deletions
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3
build.zig
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@ -31,6 +31,9 @@ pub fn build(b: *std.build.Builder) void {
// TOML Library
exe.addPackagePath("toml", "lib/zig-toml/src/toml.zig");
// OpenGL 3.3 Bindings
exe.addPackagePath("gl", "lib/gl.zig");
// Zig SDL Bindings: https://github.com/MasterQ32/SDL.zig
const sdk = Sdk.init(b);
sdk.link(exe, .dynamic);

5028
lib/gl.zig Normal file
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File diff suppressed because it is too large Load Diff

50
src/core/ppu.zig
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@ -12,9 +12,6 @@ const Allocator = std.mem.Allocator;
const log = std.log.scoped(.PPU);
const pollDmaOnBlank = @import("bus/dma.zig").pollDmaOnBlank;
/// This is used to generate byuu / Talurabi's Color Correction algorithm
const COLOUR_LUT = genColourLut();
pub const width = 240;
pub const height = 160;
pub const framebuf_pitch = width * @sizeOf(u32);
@ -392,7 +389,7 @@ pub const Ppu = struct {
const maybe_btm = self.scanline.btm()[i];
const bgr555 = self.getBgr555(maybe_top, maybe_btm);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], COLOUR_LUT[bgr555 & 0x7FFF]);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], rgba888(bgr555));
}
// Reset Current Scanline Pixel Buffer and list of fetched sprites
@ -419,7 +416,7 @@ pub const Ppu = struct {
const maybe_btm = self.scanline.btm()[i];
const bgr555 = self.getBgr555(maybe_top, maybe_btm);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], COLOUR_LUT[bgr555 & 0x7FFF]);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], rgba888(bgr555));
}
// Reset Current Scanline Pixel Buffer and list of fetched sprites
@ -445,7 +442,7 @@ pub const Ppu = struct {
const maybe_btm = self.scanline.btm()[i];
const bgr555 = self.getBgr555(maybe_top, maybe_btm);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], COLOUR_LUT[bgr555 & 0x7FFF]);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], rgba888(bgr555));
}
// Reset Current Scanline Pixel Buffer and list of fetched sprites
@ -460,7 +457,7 @@ pub const Ppu = struct {
var i: usize = 0;
while (i < width) : (i += 1) {
const bgr555 = self.vram.read(u16, vram_base + i * @sizeOf(u16));
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], COLOUR_LUT[bgr555 & 0x7FFF]);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], rgba888(bgr555));
}
},
0x4 => {
@ -471,7 +468,7 @@ pub const Ppu = struct {
// Render Current Scanline
for (self.vram.buf[vram_base .. vram_base + width]) |byte, i| {
const bgr555 = self.palette.read(u16, @as(u16, byte) * @sizeOf(u16));
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], COLOUR_LUT[bgr555 & 0x7FFF]);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], rgba888(bgr555));
}
},
0x5 => {
@ -488,7 +485,7 @@ pub const Ppu = struct {
const bgr555 =
if (scanline < m5_height and i < m5_width) self.vram.read(u16, vram_base + i * @sizeOf(u16)) else self.palette.getBackdrop();
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], COLOUR_LUT[bgr555 & 0x7FFF]);
std.mem.writeIntNative(u32, self.framebuf.get(.Emulator)[fb_base + i * @sizeOf(u32) ..][0..@sizeOf(u32)], rgba888(bgr555));
}
},
else => std.debug.panic("[PPU] TODO: Implement BG Mode {}", .{bg_mode}),
@ -1063,7 +1060,7 @@ fn spriteDimensions(shape: u2, size: u2) [2]u8 {
};
}
fn toRgba8888(bgr555: u16) u32 {
inline fn rgba888(bgr555: u16) u32 {
const b = @as(u32, bgr555 >> 10 & 0x1F);
const g = @as(u32, bgr555 >> 5 & 0x1F);
const r = @as(u32, bgr555 & 0x1F);
@ -1071,39 +1068,6 @@ fn toRgba8888(bgr555: u16) u32 {
return (r << 3 | r >> 2) << 24 | (g << 3 | g >> 2) << 16 | (b << 3 | b >> 2) << 8 | 0xFF;
}
fn genColourLut() [0x8000]u32 {
return comptime {
@setEvalBranchQuota(0x10001);
var lut: [0x8000]u32 = undefined;
for (lut) |*px, i| px.* = toRgba8888(i);
return lut;
};
}
// FIXME: The implementation is incorrect and using it in the LUT crashes the compiler (OOM)
/// Implementation courtesy of byuu and Talarubi at https://near.sh/articles/video/color-emulation
fn toRgba8888Talarubi(bgr555: u16) u32 {
@setRuntimeSafety(false);
const lcd_gamma: f64 = 4;
const out_gamma: f64 = 2.2;
const b = @as(u32, bgr555 >> 10 & 0x1F);
const g = @as(u32, bgr555 >> 5 & 0x1F);
const r = @as(u32, bgr555 & 0x1F);
const lb = std.math.pow(f64, @intToFloat(f64, b << 3 | b >> 2) / 31, lcd_gamma);
const lg = std.math.pow(f64, @intToFloat(f64, g << 3 | g >> 2) / 31, lcd_gamma);
const lr = std.math.pow(f64, @intToFloat(f64, r << 3 | r >> 2) / 31, lcd_gamma);
const out_b = std.math.pow(f64, (220 * lb + 10 * lg + 50 * lr) / 255, 1 / out_gamma);
const out_g = std.math.pow(f64, (30 * lb + 230 * lg + 10 * lr) / 255, 1 / out_gamma);
const out_r = std.math.pow(f64, (0 * lb + 50 * lg + 255 * lr) / 255, 1 / out_gamma);
return @floatToInt(u32, out_r) << 24 | @floatToInt(u32, out_g) << 16 | @floatToInt(u32, out_b) << 8 | 0xFF;
}
fn alphaBlend(top: u16, btm: u16, bldalpha: io.BldAlpha) u16 {
const eva: u16 = bldalpha.eva.read();
const evb: u16 = bldalpha.evb.read();

146
src/platform.zig
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@ -1,5 +1,6 @@
const std = @import("std");
const SDL = @import("sdl2");
const gl = @import("gl");
const emu = @import("core/emu.zig");
const config = @import("config.zig");
@ -11,21 +12,43 @@ const FpsTracker = @import("util.zig").FpsTracker;
const span = @import("util.zig").span;
const pitch = @import("core/ppu.zig").framebuf_pitch;
const gba_width = @import("core/ppu.zig").width;
const gba_height = @import("core/ppu.zig").height;
const default_title: []const u8 = "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
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,
title: []const u8,
renderer: *SDL.SDL_Renderer,
texture: *SDL.SDL_Texture,
audio: Audio,
program_id: gl.GLuint,
pub fn init(title: *const [12]u8, apu: *Apu, width: i32, height: i32) Self {
const ret = SDL.SDL_Init(SDL.SDL_INIT_VIDEO | SDL.SDL_INIT_EVENTS | SDL.SDL_INIT_AUDIO | SDL.SDL_INIT_GAMECONTROLLER);
if (ret < 0) panic();
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);
@ -35,29 +58,98 @@ pub const Gui = struct {
SDL.SDL_WINDOWPOS_CENTERED,
@as(c_int, width * win_scale),
@as(c_int, height * win_scale),
SDL.SDL_WINDOW_SHOWN,
SDL.SDL_WINDOW_OPENGL | SDL.SDL_WINDOW_SHOWN,
) orelse panic();
const renderer_flags = SDL.SDL_RENDERER_ACCELERATED | if (config.config().host.vsync) SDL.SDL_RENDERER_PRESENTVSYNC else 0;
const renderer = SDL.SDL_CreateRenderer(window, -1, @bitCast(u32, renderer_flags)) orelse panic();
const ctx = SDL.SDL_GL_CreateContext(window) orelse panic();
if (SDL.SDL_GL_MakeCurrent(window, ctx) < 0) panic();
const texture = SDL.SDL_CreateTexture(
renderer,
SDL.SDL_PIXELFORMAT_RGBA8888,
SDL.SDL_TEXTUREACCESS_STREAMING,
@as(c_int, width),
@as(c_int, height),
) orelse panic();
gl.load(ctx, Self.glGetProcAddress) catch @panic("gl.load failed");
if (SDL.SDL_GL_SetSwapInterval(@boolToInt(config.config().host.vsync)) < 0) panic();
const program_id = compileShaders();
return Self{
.window = window,
.title = span(title),
.renderer = renderer,
.texture = texture,
.ctx = ctx,
.program_id = program_id,
.audio = Audio.init(apu),
};
}
fn compileShaders() gl.GLuint {
// TODO: Panic on Shader Compiler Failure + Error Message
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);
const fs = gl.createShader(gl.FRAGMENT_SHADER);
defer gl.deleteShader(fs);
gl.shaderSource(fs, 1, &[_][*c]const u8{frag_shader}, 0);
gl.compileShader(fs);
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 generateBuffers() [3]c_uint {
var vao_id: c_uint = undefined;
var vbo_id: c_uint = undefined;
var ebo_id: c_uint = undefined;
gl.genVertexArrays(1, &vao_id);
gl.genBuffers(1, &vbo_id);
gl.genBuffers(1, &ebo_id);
gl.bindVertexArray(vao_id);
gl.bindBuffer(gl.ARRAY_BUFFER, vbo_id);
gl.bufferData(gl.ARRAY_BUFFER, @sizeOf(@TypeOf(vertices)), &vertices, gl.STATIC_DRAW);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebo_id);
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), @intToPtr(?*anyopaque, 0)); // 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 generateTexture(buf: []const u8) c_uint {
var tex_id: c_uint = 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.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;
}
pub fn run(self: *Self, cpu: *Arm7tdmi, scheduler: *Scheduler) !void {
var quit = std.atomic.Atomic(bool).init(false);
var tracker = FpsTracker.init();
@ -67,6 +159,9 @@ pub const Gui = struct {
var title_buf: [0x100]u8 = [_]u8{0} ** 0x100;
const vao_id = Self.generateBuffers()[0];
_ = Self.generateTexture(cpu.bus.ppu.framebuf.get(.Renderer));
emu_loop: while (true) {
var event: SDL.SDL_Event = undefined;
while (SDL.SDL_PollEvent(&event) != 0) {
@ -125,9 +220,12 @@ pub const Gui = struct {
// Emulator has an internal Double Buffer
const framebuf = cpu.bus.ppu.framebuf.get(.Renderer);
_ = SDL.SDL_UpdateTexture(self.texture, null, framebuf.ptr, pitch);
_ = SDL.SDL_RenderCopy(self.renderer, self.texture, null, null);
SDL.SDL_RenderPresent(self.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.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.bufPrint(&title_buf, "ZBA | {s} [Emu: {}fps] ", .{ self.title, tracker.value() }) catch unreachable;
SDL.SDL_SetWindowTitle(self.window, dyn_title.ptr);
@ -138,12 +236,18 @@ pub const Gui = struct {
pub fn deinit(self: *Self) void {
self.audio.deinit();
SDL.SDL_DestroyTexture(self.texture);
SDL.SDL_DestroyRenderer(self.renderer);
// TODO: Buffer deletions
gl.deleteProgram(self.program_id);
SDL.SDL_GL_DeleteContext(self.ctx);
SDL.SDL_DestroyWindow(self.window);
SDL.SDL_Quit();
self.* = undefined;
}
fn glGetProcAddress(ctx: SDL.SDL_GLContext, proc: [:0]const u8) ?*anyopaque {
_ = ctx;
return SDL.SDL_GL_GetProcAddress(proc.ptr);
}
};
const Audio = struct {

25
src/shader/pixelbuf.frag Normal file
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@ -0,0 +1,25 @@
#version 330 core
out vec4 frag_color;
in vec3 color;
in vec2 uv;
uniform sampler2D screen;
void main() {
// https://near.sh/video/color-emulation
// Thanks to Talarubi + Near for the Colour Correction
// Thanks to fleur + mattrb for the Shader Impl
vec4 color = texture(screen, uv);
color.rgb = pow(color.rgb, vec3(4.0)); // LCD Gamma
frag_color = vec4(
pow(vec3(
0 * color.b + 50 * color.g + 255 * color.r,
30 * color.b + 230 * color.g + 10 * color.r,
220 * color.b + 10 * color.g + 50 * color.r
) / 255, vec3(1.0 / 2.2)), // Out Gamma
1.0);
}

13
src/shader/pixelbuf.vert Normal file
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@ -0,0 +1,13 @@
#version 330 core
layout (location = 0) in vec3 pos;
layout (location = 1) in vec3 in_color;
layout (location = 2) in vec2 in_uv;
out vec3 color;
out vec2 uv;
void main() {
color = in_color;
uv = in_uv;
gl_Position = vec4(pos, 1.0);
}