22 lines
625 B
GLSL
22 lines
625 B
GLSL
#version 120
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uniform sampler2D colorTex;
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varying vec4 color;
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varying vec2 texCoord;
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void main(void)
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{
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// we pass color index as short int
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// reusing gl_MultiTexCoord0.z
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// we use 255 only because we have 256 color indices
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float t = gl_MultiTexCoord0.z / 255.0f; // [0, 255] -> [0, 1]
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// we pass alpha values as as short int
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// reusing gl_MultiTexCoord0.w
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// we use 65535 for better precision
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float a = gl_MultiTexCoord0.w / 65535.0f; // [0, 65535] -> [0, 1]
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color = vec4(texture2D(colorTex, vec2(t, 0.0f)).rgb, a);
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texCoord = gl_MultiTexCoord0.st;
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gl_Position = ftransform();
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}
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