mirror of https://github.com/mgba-emu/mgba.git
GBA Video: Avoid integer division using reciprocal tricks
This commit is contained in:
Vicki Pfau
parent
e1fc8cd912
commit
41a40acefc
1
CHANGES
1
CHANGES
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@ -94,6 +94,7 @@ Misc:
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- GBA Video: Convert OpenGL VRAM texture to integer
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- GBA Video: Skip attempting to render offscreen sprites in OpenGL
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- GBA Video: New GL palette approach, no more batch splitting on palette edits
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- GBA Video: Avoid integer division using reciprocal tricks
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- Debugger: Keep track of global cycle count
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- FFmpeg: Add looping option for GIF/APNG
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- mGUI: Show battery percentage
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@ -53,6 +53,9 @@ struct GBAVideoGLUniform {
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};
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#define PALETTE_ENTRY "#define PALETTE_ENTRY(x) (vec3((ivec3(0x1F, 0x3E0, 0x7C00) & (x)) >> ivec3(0, 5, 10)) / 31.)\n"
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#define MOSAIC \
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"#define MOSAIC(LHS, RHS) (((int(LHS) * mosaicTable[RHS]) >> 12) * RHS)\n" \
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"const int mosaicTable[17] = int[17](0, 4096, 2048, 1366, 1024, 820, 683, 586, 512, 456, 410, 373, 342, 316, 293, 274, 256);\n"
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static const GLchar* const _gles3Header =
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"#version 300 es\n"
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@ -117,6 +120,7 @@ static const struct GBAVideoGLUniform _uniformsMode0[] = {
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};
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static const char* const _renderMode0 =
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MOSAIC
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"in vec2 texCoord;\n"
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"uniform isampler2D vram;\n"
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"uniform sampler2D palette;\n"
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@ -132,10 +136,10 @@ static const char* const _renderMode0 =
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"void main() {\n"
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" ivec2 coord = ivec2(texCoord);\n"
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" if (mosaic.x > 1) {\n"
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" coord.x -= coord.x % mosaic.x;\n"
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" coord.x = MOSAIC(coord.x, mosaic.x);\n"
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" }\n"
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" if (mosaic.y > 1) {\n"
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" coord.y -= coord.y % mosaic.y;\n"
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" coord.y = MOSAIC(coord.y, mosaic.y);\n"
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" }\n"
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" coord += (ivec2(0x1FF, 0x1FF000) & offset[int(texCoord.y)]) >> ivec2(0, 12);\n"
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" ivec2 wrap = ivec2(255, 255);\n"
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@ -219,6 +223,7 @@ static const char* const _interpolate =
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"}\n";
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static const char* const _renderMode2 =
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MOSAIC
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"in vec2 texCoord;\n"
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"uniform isampler2D vram;\n"
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"uniform sampler2D palette;\n"
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@ -253,10 +258,10 @@ static const char* const _renderMode2 =
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" ivec2 offset[4];\n"
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" vec2 incoord = texCoord;\n"
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" if (mosaic.x > 1) {\n"
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" incoord.x = floor(incoord.x - float(int(incoord.x) % mosaic.x));\n"
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" incoord.x = float(MOSAIC(incoord.x, mosaic.x));\n"
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" }\n"
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" if (mosaic.y > 1) {\n"
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" incoord.y = floor(incoord.y - float(int(incoord.y) % mosaic.y));\n"
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" incoord.y = float(MOSAIC(incoord.y, mosaic.y));\n"
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" }\n"
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" loadAffine(int(incoord.y), mat, offset);\n"
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" float y = fract(incoord.y);\n"
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@ -286,6 +291,7 @@ static const struct GBAVideoGLUniform _uniformsMode35[] = {
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};
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static const char* const _renderMode35 =
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MOSAIC
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"in vec2 texCoord;\n"
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"uniform isampler2D vram;\n"
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"uniform int charBase;\n"
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@ -303,10 +309,10 @@ static const char* const _renderMode35 =
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" ivec2 offset[4];\n"
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" vec2 incoord = texCoord;\n"
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" if (mosaic.x > 1) {\n"
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" incoord.x = floor(incoord.x - float(int(incoord.x) % mosaic.x));\n"
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" incoord.x = floor(MOSAIC(incoord.x, mosaic.x));\n"
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" }\n"
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" if (mosaic.y > 1) {\n"
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" incoord.y = floor(incoord.y - float(int(incoord.y) % mosaic.y));\n"
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" incoord.y = floor(MOSAIC(incoord.y, mosaic.y));\n"
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" }\n"
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" loadAffine(int(incoord.y), mat, offset);\n"
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" float y = fract(incoord.y);\n"
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@ -345,6 +351,7 @@ static const struct GBAVideoGLUniform _uniformsMode4[] = {
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};
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static const char* const _renderMode4 =
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MOSAIC
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"in vec2 texCoord;\n"
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"uniform isampler2D vram;\n"
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"uniform sampler2D palette;\n"
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@ -363,10 +370,10 @@ static const char* const _renderMode4 =
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" ivec2 offset[4];\n"
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" vec2 incoord = texCoord;\n"
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" if (mosaic.x > 1) {\n"
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" incoord.x = floor(incoord.x - float(int(incoord.x) % mosaic.x));\n"
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" incoord.x = floor(MOSAIC(incoord.x, mosaic.x));\n"
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" }\n"
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" if (mosaic.y > 1) {\n"
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" incoord.y = floor(incoord.y - float(int(incoord.y) % mosaic.y));\n"
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" incoord.y = floor(MOSAIC(incoord.y, mosaic.y));\n"
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" }\n"
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" loadAffine(int(incoord.y), mat, offset);\n"
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" float y = fract(incoord.y);\n"
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@ -412,6 +419,7 @@ static const struct GBAVideoGLUniform _uniformsObj[] = {
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};
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static const char* const _renderObj =
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MOSAIC
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"in vec2 texCoord;\n"
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"uniform isampler2D vram;\n"
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"uniform sampler2D palette;\n"
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@ -434,17 +442,20 @@ static const char* const _renderObj =
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" vec2 incoord = texCoord;\n"
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" if (mosaic.x > 1) {\n"
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" int x = int(incoord.x);\n"
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" incoord.x = float(clamp(x - (mosaic.z + x) % mosaic.x, 0, dims.z - 1));\n"
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" x = MOSAIC(mosaic.z + x, mosaic.x) - mosaic.z;\n"
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" incoord.x = float(clamp(x, 0, dims.z - 1));\n"
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" } else if (mosaic.x < -1) {\n"
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" int x = dims.z - int(incoord.x) - 1;\n"
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" incoord.x = float(clamp(dims.z - x + (mosaic.z + x) % -mosaic.x - 1, 0, dims.z - 1));\n"
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" x = dims.z - MOSAIC(mosaic.z + x, -mosaic.x) + mosaic.z - 1;\n"
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" incoord.x = float(clamp(x, 0, dims.z - 1));\n"
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" }\n"
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" if (cyclesRemaining[int(incoord.y) + mosaic.w] <= 0) {\n"
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" discard;\n"
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" }\n"
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" if (mosaic.y > 1) {\n"
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" int y = int(incoord.y);\n"
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" incoord.y = float(clamp(y - (mosaic.w + y) % mosaic.y, 0, dims.w - 1));\n"
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" y = MOSAIC(mosaic.w + y, mosaic.y) - mosaic.w;"
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" incoord.y = float(clamp(y, 0, dims.w - 1));\n"
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" }\n"
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" ivec2 coord = ivec2(transform * (incoord - vec2(dims.zw) / 2.) + vec2(dims.xy) / 2.);\n"
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" if ((coord & ~(dims.xy - 1)) != ivec2(0, 0)) {\n"
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