27 lines
824 B
GLSL
27 lines
824 B
GLSL
uniform sampler2D winTexture;
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uniform float textureWidth;
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uniform float textureHeight;
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uniform float opacity;
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uniform float brightness;
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uniform float saturation;
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// Converts pixel coordinates to texture coordinates
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vec2 pix2tex( vec2 pix )
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{
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return vec2( pix.s / textureWidth, pix.t / textureHeight );
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}
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void main()
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{
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vec4 tex = texture2D( winTexture, pix2tex( gl_TexCoord[0].st ));
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tex = vec4(( vec3( 1.0 ) - tex.rgb / vec3( tex.a )) * vec3( tex.a * opacity ), tex.a * opacity );
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if( saturation != 1.0 )
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{
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vec3 desaturated = tex.rgb * vec3( 0.30, 0.59, 0.11 );
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desaturated = vec3( dot( desaturated, tex.rgb ));
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tex.rgb = tex.rgb * vec3( saturation ) + desaturated * vec3( 1.0 - saturation );
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}
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tex.rgb = tex.rgb * vec3( brightness );
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gl_FragColor = tex;
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}
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