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https://github.com/gnif/LookingGlass.git
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91b0cba145
This fixes a rounding issue on certain hardware (NVidia) which actually implement mediump as half precision (16-bit) float. It's safe to assume `highp` is available as if the GPU does not support it, then the shader compiler will try to find a lower precision that is supported by the GPU
30 lines
467 B
GLSL
30 lines
467 B
GLSL
#version 300 es
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precision highp float;
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in vec2 uv;
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out vec4 color;
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uniform sampler2D sampler1;
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uniform float scale;
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void main()
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{
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vec4 tmp;
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if (scale > 1.0)
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{
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vec2 ts = vec2(textureSize(sampler1, 0));
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vec2 px = (uv - (0.5 / ts)) * ts;
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if (px.x < 0.0 || px.y < 0.0)
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discard;
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tmp = texelFetch(sampler1, ivec2(px), 0);
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}
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else
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tmp = texture(sampler1, uv);
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if (tmp.rgb == vec3(0.0, 0.0, 0.0))
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discard;
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color = tmp;
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}
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