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https://github.com/gnif/LookingGlass.git
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33 lines
852 B
C
33 lines
852 B
C
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#if __VERSION__ == 300
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vec4 textureGather(sampler2D tex, vec2 uv, int comp)
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{
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vec4 c0 = textureOffset(tex, uv, ivec2(0,1));
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vec4 c1 = textureOffset(tex, uv, ivec2(1,1));
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vec4 c2 = textureOffset(tex, uv, ivec2(1,0));
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vec4 c3 = textureOffset(tex, uv, ivec2(0,0));
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return vec4(c0[comp], c1[comp], c2[comp],c3[comp]);
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}
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#elif __VERSION__ < 300
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vec4 textureGather(sampler2D tex, vec2 uv, int comp)
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{
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vec4 c3 = texture2D(tex, uv);
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return vec4(c3[comp], c3[comp], c3[comp],c3[comp]);
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}
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#endif
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#if __VERSION__ < 310
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uint bitfieldExtract(uint val, int off, int size)
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{
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uint mask = uint((1 << size) - 1);
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return uint(val >> off) & mask;
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}
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uint bitfieldInsert(uint a, uint b, int c, int d)
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{
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uint mask = ~(0xffffffffu << d) << c;
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mask = ~mask;
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a &= mask;
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return a | (b << c);
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}
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#endif
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