mirror of
https://github.com/ZDoom/raze-gles.git
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2f4078d99e
This restores support for OpenGL implementations without persistent mapped buffers, and helps with strict core profile GLSL compilers
21 lines
467 B
GLSL
21 lines
467 B
GLSL
#version 330
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//s_texture points to an indexed color texture
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uniform sampler2D s_texture;
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//s_palette is the palette texture
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uniform sampler2D s_palette;
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in vec2 v_texCoord;
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out vec4 FragColor;
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const float c_paletteScale = 255.0/256.0;
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const float c_paletteOffset = 0.5/256.0;
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void main()
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{
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vec4 color = texture(s_texture, v_texCoord.xy);
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color.r = c_paletteOffset + c_paletteScale*color.r;
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color.rgb = texture(s_palette, color.rg).rgb;
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FragColor = color;
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}
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