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Rust: Add a Glide renderer (2D only for now) This is an experiment for a Rust renderer, iterating over the Python data using pyo3. It requires --feature=glide to be passed to cargo build, doesn’t support NPOT textures, text rendering, the background, or even msg faces, some of that may come in a future changeset.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Mon, 05 Sep 2022 17:53:36 +0200
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1 use core::ptr::null;
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2
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3 #[link(name = "glide2x")]
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4 extern "C" {
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5 fn grGlideInit();
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6 fn grGlideShutdown();
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7 fn grSstSelect(sst: u32);
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8 fn grSstWinOpen(hwnd: u32, resolution: u32, refresh: u32, color_format: u32, origin_location: u32, num_buf: i32, num_aux_buf: i32);
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9 fn grBufferSwap(interval: i32);
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10 fn grBufferClear(color: u32, alpha: u8, depth: u16);
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11 fn grTexCalcMemRequired(min: Lod, max: Lod, aspect: AspectRatio, format: TextureFormat) -> u32;
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12 fn grTexDownloadMipMap(tmu: u32, start: u32, even_odd: EvenOdd, info: *const TexInfo);
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13 fn grTexSource(tmu: u32, start: u32, even_odd: EvenOdd, info: &TexInfo);
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14 fn grTexMinAddress(tmu: u32) -> u32;
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15 fn grTexMaxAddress(tmu: u32) -> u32;
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16 fn guAlphaSource(mode: AlphaSource) -> u32;
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17 fn guColorCombineFunction(function: ColorCombineFnc) -> u32;
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18 fn grTexCombineFunction(tmu: u32, function: TextureCombineFnc) -> u32;
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19 fn grDrawTriangle(a: *const Vertex, b: *const Vertex, c: *const Vertex);
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20 fn grAlphaBlendFunction(a: Blend, b: Blend, c: Blend, d: Blend);
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21 }
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22
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23 #[repr(i32)]
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24 #[derive(Clone, Copy)]
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25 pub enum Lod {
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26 L256x256 = 0,
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27 L128x128 = 1,
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28 L64x64 = 2,
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29 L32x32 = 3,
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30 L16x16 = 4,
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31 L8x8 = 5,
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32 L4x4 = 6,
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33 L2x2 = 7,
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34 L1x1 = 8,
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35 }
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36
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37 #[repr(i32)]
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38 #[derive(Clone, Copy)]
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39 pub enum AspectRatio {
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40 A8x1 = 0,
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41 A4x1 = 1,
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42 A2x1 = 2,
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43 A1x1 = 3,
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44 A1x2 = 4,
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45 A1x4 = 5,
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46 A1x8 = 6,
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47 }
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48
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49 fn lod_aspect_from_dimensions(dimensions: (u32, u32)) -> (Lod, AspectRatio) {
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50 match dimensions {
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51 (256, 256) => (Lod::L256x256, AspectRatio::A1x1),
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52 (128, 128) => (Lod::L128x128, AspectRatio::A1x1),
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53 (64, 64) => (Lod::L64x64, AspectRatio::A1x1),
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54 (32, 32) => (Lod::L32x32, AspectRatio::A1x1),
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55 (16, 16) => (Lod::L16x16, AspectRatio::A1x1),
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56 (8, 8) => (Lod::L8x8, AspectRatio::A1x1),
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57 (4, 4) => (Lod::L4x4, AspectRatio::A1x1),
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58 (2, 2) => (Lod::L2x2, AspectRatio::A1x1),
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59 (1, 1) => (Lod::L1x1, AspectRatio::A1x1),
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60 (width, height) => todo!("NPOT texture size {width}×{height}"),
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61 }
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62 }
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63
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64 #[repr(i32)]
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65 #[derive(Clone, Copy, Debug)]
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66 pub enum TextureFormat {
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67 Rgb332 = 0,
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68 Yiq422 = 1,
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69 Alpha8 = 2,
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70 Intensity8 = 3,
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71 AlphaIntensity44 = 4,
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72 P8 = 5,
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73 Argb8332 = 8,
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74 Ayiq8422 = 9,
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75 Rgb565 = 10,
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76 Argb1555 = 11,
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77 Argb4444 = 12,
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78 AlphaIntensity88 = 13,
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79 Ap88 = 14,
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80 }
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81
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82 #[repr(C)]
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83 pub struct TexInfo {
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84 pub small_lod: Lod,
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85 pub large_lod: Lod,
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86 pub aspect: AspectRatio,
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87 pub format: TextureFormat,
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88 data: *const u8,
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89 }
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90
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91 impl TexInfo {
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92 pub fn new(width: u32, height: u32, format: TextureFormat) -> TexInfo {
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93 let (lod, aspect) = lod_aspect_from_dimensions((width, height));
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94 TexInfo {
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95 small_lod: lod,
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96 large_lod: lod,
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97 aspect,
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98 format,
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99 data: null(),
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100 }
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101 }
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102
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103 pub fn with_data(width: u32, height: u32, format: TextureFormat, data: &[u8]) -> TexInfo {
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104 let (lod, aspect) = lod_aspect_from_dimensions((width, height));
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105 TexInfo {
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106 small_lod: lod,
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107 large_lod: lod,
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108 aspect,
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109 format,
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110 data: data.as_ptr(),
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111 }
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112 }
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113 }
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114
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115 #[repr(C)]
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116 pub struct Vertex {
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117 x: f32,
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118 y: f32,
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119 z: f32,
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120 r: f32,
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121 g: f32,
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122 b: f32,
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123 ooz: f32,
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124 a: f32,
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125 oow: f32,
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126 sow0: f32,
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127 tow0: f32,
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128 oow0: f32,
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129 sow1: f32,
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130 tow1: f32,
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131 oow1: f32,
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132 }
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133
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134 impl Vertex {
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135 pub fn new(x: f32, y: f32, sow: f32, tow: f32, color: u32) -> Vertex {
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136 let z = 1.0;
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137 let r = ((color >> 24) & 0xff) as f32;
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138 let g = ((color >> 16) & 0xff) as f32;
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139 let b = ((color >> 8) & 0xff) as f32;
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140 let a = (color & 0xff) as f32;
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141 let ooz = 1.0;
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142 let oow = 1.0;
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143 let sow0 = sow;
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144 let tow0 = tow;
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145 let oow0 = 1.0;
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146 let sow1 = sow;
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147 let tow1 = tow;
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148 let oow1 = 1.0;
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149 Vertex {
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150 x, y, z,
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151 r, g, b,
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152 ooz,
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153 a,
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154 oow,
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155 sow0, tow0, oow0,
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156 sow1, tow1, oow1,
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157 }
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158 }
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159 }
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160
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161 pub fn glide_init() {
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162 unsafe { grGlideInit() };
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163 }
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164
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165 pub fn glide_shutdown() {
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166 unsafe { grGlideShutdown() };
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167 }
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168
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169 pub fn sst_select(sst: u32) {
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170 unsafe { grSstSelect(sst) };
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171 }
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172
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173 pub fn sst_win_open(width: u32, height: u32, refresh: u32) {
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174 let resolution = match (width, height) {
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175 (320, 200) => 0,
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176 (320, 240) => 1,
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177 (400, 256) => 2,
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178 (512, 384) => 3,
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179 (640, 200) => 4,
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180 (640, 350) => 5,
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181 (640, 400) => 6,
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182 (640, 480) => 7,
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183 _ => unreachable!("Unknown screen resolution {width}×{height}."),
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184 };
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185 let refresh = match refresh {
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186 60 => 0,
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187 70 => 1,
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188 72 => 2,
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189 75 => 3,
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190 80 => 4,
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191 90 => 5,
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192 100 => 6,
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193 85 => 7,
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194 120 => 8,
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195 _ => unreachable!("Unknown refresh rate {refresh} Hz."),
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196 };
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197 let color_format = 2; // RGBA
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198 let origin_location = 0; // Upper Left
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199 unsafe { grSstWinOpen(0, resolution, refresh, color_format, origin_location, 2, 0) };
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200 }
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201
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202 pub fn buffer_swap(interval: i32) {
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203 unsafe { grBufferSwap(interval) };
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204 }
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205
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206 pub fn buffer_clear(color: u32, alpha: u8, depth: u16) {
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207 unsafe { grBufferClear(color, alpha, depth) };
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208 }
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209
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210 pub fn tex_calc_mem_required(small_lod: Lod, large_lod: Lod, aspect: AspectRatio, format: TextureFormat) -> u32 {
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211 unsafe { grTexCalcMemRequired(small_lod, large_lod, aspect, format) }
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212 }
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213
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214 pub fn tex_download_mip_map(tmu: u32, start: u32, even_odd: EvenOdd, info: &TexInfo) {
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215 unsafe { grTexDownloadMipMap(tmu, start, even_odd, info) };
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216 }
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217
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218 pub fn tex_source(tmu: u32, start: u32, even_odd: EvenOdd, info: &TexInfo) {
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219 unsafe { grTexSource(tmu, start, even_odd, info) };
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220 }
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221
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222 pub fn tex_min_address(tmu: u32) -> u32 {
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223 unsafe { grTexMinAddress(tmu) }
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224 }
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225
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226 pub fn tex_max_address(tmu: u32) -> u32 {
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227 unsafe { grTexMaxAddress(tmu) }
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228 }
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229
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230 pub fn alpha_source(mode: AlphaSource) {
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231 unsafe { guAlphaSource(mode) };
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232 }
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233
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234 pub fn color_combine_function(function: ColorCombineFnc) {
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235 unsafe { guColorCombineFunction(function) };
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236 }
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237
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238 pub fn tex_combine_function(tmu: u32, function: TextureCombineFnc) {
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239 unsafe { grTexCombineFunction(tmu, function) };
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240 }
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241
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242 pub fn alpha_blend_function(a: Blend, b: Blend, c: Blend, d: Blend) {
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243 unsafe { grAlphaBlendFunction(a, b, c, d) };
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244 }
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245
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246 #[repr(i32)]
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247 pub enum EvenOdd {
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248 Even = 0,
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249 Odd = 1,
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250 Both = 2,
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251 }
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252
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253 #[repr(i32)]
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254 pub enum Blend {
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255 Zero = 0,
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256 SrcAlpha = 1,
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257 SrcColor = 2,
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258 DstAlpha = 3,
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259 One = 4,
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260 OneMinusSrcAlpha = 5,
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261 OneMinusSrcColor = 6,
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262 OneMinusDstAlpha = 7,
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263 AlphaSaturate = 15,
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264 }
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265
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266 #[repr(i32)]
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267 pub enum AlphaSource {
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268 CcAlpha = 0,
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269 IteratedAlpha = 1,
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270 TextureAlpha = 2,
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271 TextureAlphaTimesIteratedAlpha = 3,
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272 }
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273
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274 #[repr(i32)]
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275 pub enum ColorCombineFnc {
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276 Zero = 0,
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277 Ccrgb = 1,
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278 Itrgb = 2,
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279 ItrgbDelta0 = 3,
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280 DecalTexture = 4,
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281 TextureTimesCcrgb = 5,
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282 TextureTimesItrgb = 6,
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283 TextureTimesItrgbDelta0 = 7,
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284 TextureTimesItrgbAddAlpha = 8,
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285 TextureTimesAlpha = 9,
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286 TextureTimesAlphaAddItrgb = 10,
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287 TextureAddItrgb = 11,
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288 TextureSubItrgb = 12,
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289 CcrgbBlendItrgbOnTexalpha = 13,
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290 DiffSpecA = 14,
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291 DiffSpecB = 15,
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292 One = 16,
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293 }
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294
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295 #[repr(i32)]
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296 pub enum TextureCombineFnc {
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297 Zero = 0,
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298 Decal = 1,
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299 Other = 2,
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300 Add = 3,
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301 Multiply = 4,
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302 Subtract = 5,
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303 Detail = 6,
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304 DetailOther = 7,
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305 TrilinearOdd = 8,
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306 TrilinearEven = 9,
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307 One = 10,
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308 }
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309
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310 pub fn draw_triangle(a: &Vertex, b: &Vertex, c: &Vertex) {
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311 unsafe { grDrawTriangle(a, b, c) };
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312 }