20 lines
675 B
GLSL
20 lines
675 B
GLSL
#version 450 core
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//! type fragment
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layout( location = 0 ) uniform sampler2D u_InputTexture;
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layout( location = 1 ) uniform vec2 u_OutputSize;
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layout( location = 2 ) uniform int u_SourceLOD;
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layout( location = 0 ) out vec3 color;
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void main( void )
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{
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const vec2 c = gl_FragCoord.xy;
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color = ( .25 * (
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textureLod( u_InputTexture , ( c + vec2( .5 , .5 ) ) / u_OutputSize , u_SourceLOD )
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+ textureLod( u_InputTexture , ( c + vec2(-.5 , .5 ) ) / u_OutputSize , u_SourceLOD )
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+ textureLod( u_InputTexture , ( c + vec2( .5 ,-.5 ) ) / u_OutputSize , u_SourceLOD )
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+ textureLod( u_InputTexture , ( c + vec2(-.5 ,-.5 ) ) / u_OutputSize , u_SourceLOD )
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) ).rgb;
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}
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