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Shadergen fog

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This commit is contained in:
offtkp 2024-07-21 16:32:45 +03:00
parent 4176a19256
commit b90c15919b
4 changed files with 53 additions and 1 deletions
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25
src/core/PICA/shader_gen_glsl.cpp
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@ -194,6 +194,8 @@ std::string FragmentGenerator::generate(const FragmentConfig& config) {
compileTEV(ret, i, config);
}
compileFog(ret, config);
applyAlphaTest(ret, config);
ret += "fragColor = combinerOutput;\n}"; // End of main function
@ -652,4 +654,27 @@ void FragmentGenerator::compileLUTLookup(std::string& shader, const PICA::Fragme
shader += "lut_lookup_result *= " + std::to_string(scales[scale]) + ";\n";
}
}
}
void FragmentGenerator::compileFog(std::string& shader, const PICA::FragmentConfig& config) {
if (config.fogConfig.mode != FogMode::Fog) {
return;
}
float r = config.fogConfig.fogColorR / 255.0f;
float g = config.fogConfig.fogColorG / 255.0f;
float b = config.fogConfig.fogColorB / 255.0f;
if (config.fogConfig.flipDepth) {
shader += "float fog_index = (1.0 - depth) * 128.0;\n";
} else {
shader += "float fog_index = depth * 128.0;\n";
}
shader += "float clamped_index = clamp(floor(fog_index), 0.0, 127.0);";
shader += "float delta = fog_index - clamped_index;";
shader += "vec3 fog_color = vec3(" + std::to_string(r) + ", " + std::to_string(g) + ", " + std::to_string(b) + ");";
shader += "vec2 value = texelFetch(u_tex_luts, ivec2(int(clamped_index), 24), 0).rg;"; // fog LUT is past the light LUTs
shader += "float fog_factor = clamp(value.r + value.g * delta, 0.0, 1.0);";
shader += "combinerOutput.rgb = mix(fog_color, combinerOutput.rgb, fog_factor);";
}