18 lines
383 B
GLSL
18 lines
383 B
GLSL
uniform vec2 r1,r2; // matrix elements
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vec4 DecodeChannelMask( float x )
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{
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if (x > 0.0)
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return (x > 0.5) ? vec4(1,0,0,0) : vec4(0,1,0,0);
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else
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return (x < -0.5) ? vec4(0,0,0,1) : vec4(0,0,1,0);
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}
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void main()
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{
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vec2 p = gl_Vertex.xy*r1 + r2;
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gl_Position = vec4(p.x,p.y,0,1);
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gl_TexCoord[0] = gl_MultiTexCoord0;
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gl_TexCoord[1] = DecodeChannelMask(gl_MultiTexCoord0.w);
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}
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