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https://github.com/ZDoom/qzdoom-gpl.git
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23 lines
642 B
GLSL
23 lines
642 B
GLSL
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in vec2 TexCoord;
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out vec4 FragColor;
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uniform sampler2D ExposureTexture;
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void main()
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{
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#if __VERSION__ < 400
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ivec2 size = textureSize(ExposureTexture, 0);
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ivec2 tl = max(ivec2(TexCoord * vec2(size) - 0.5), ivec2(0));
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ivec2 br = min(tl + ivec2(1), size - ivec2(1));
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vec4 values = vec4(
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texelFetch(ExposureTexture, tl, 0).x,
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texelFetch(ExposureTexture, ivec2(tl.x, br.y), 0).x,
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texelFetch(ExposureTexture, ivec2(br.x, tl.y), 0).x,
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texelFetch(ExposureTexture, br, 0).x);
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#else
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vec4 values = textureGather(ExposureTexture, TexCoord);
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#endif
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FragColor = vec4((values.x + values.y + values.z + values.w) * 0.25, 0.0, 0.0, 1.0);
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}
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