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https://github.com/ZDoom/gzdoom.git
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41 lines
1.1 KiB
GLSL
41 lines
1.1 KiB
GLSL
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in vec2 TexCoord;
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out vec4 FragColor;
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#if defined(MULTISAMPLE)
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uniform sampler2DMS DepthTexture;
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uniform int SampleCount;
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#else
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uniform sampler2D DepthTexture;
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#endif
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uniform float LinearizeDepthA;
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uniform float LinearizeDepthB;
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uniform float InverseDepthRangeA;
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uniform float InverseDepthRangeB;
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uniform vec2 Scale;
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uniform vec2 Offset;
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void main()
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{
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vec2 uv = Offset + TexCoord * Scale;
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#if defined(MULTISAMPLE)
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ivec2 texSize = textureSize(DepthTexture);
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ivec2 ipos = ivec2(uv * vec2(texSize));
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float depth = 0.0;
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for (int i = 0; i < SampleCount; i++)
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depth += texelFetch(DepthTexture, ipos, i).x;
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depth /= float(SampleCount);
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#else
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/*ivec2 texSize = textureSize(DepthTexture, 0);
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ivec2 ipos = ivec2(uv * vec2(texSize));
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if (ipos.x < 0) ipos.x += texSize.x;
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if (ipos.y < 0) ipos.y += texSize.y;
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float depth = texelFetch(DepthTexture, ipos, 0).x;*/
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float depth = texture(DepthTexture, uv).x;
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#endif
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float normalizedDepth = clamp(InverseDepthRangeA * depth + InverseDepthRangeB, 0.0, 1.0);
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FragColor = vec4(1.0 / (normalizedDepth * LinearizeDepthA + LinearizeDepthB), 0.0, 0.0, 1.0);
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}
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