59 lines
1.8 KiB
GLSL
59 lines
1.8 KiB
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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uniform float front;
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uniform float useTexture;
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vec2 pix2tex(vec2 pix)
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{
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return vec2(pix.x / textureWidth, pix.y / textureHeight);
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}
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void main()
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{
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if( front > 0.0 && gl_FrontFacing )
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discard;
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if( front < 0.0 && !gl_FrontFacing )
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discard;
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if( useTexture > 0.0 )
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{
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// remove the shadow decoration quads
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if( gl_TexCoord[0].x < 0.0 || gl_TexCoord[0].x > textureWidth ||
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gl_TexCoord[0].y < 0.0 || gl_TexCoord[0].y > textureHeight )
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discard;
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vec4 tex = texture2D(winTexture, pix2tex(gl_TexCoord[0].xy));
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// change saturation, brightness and opacity
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// in the exactly same way as in SceneOpenGL::Window::prepareRenderStates()
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// see scene_opengl.cpp
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float sourceAlpha = tex.a;
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float opacityByBrightness = opacity * brightness;
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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 * saturation + desaturated * ( 1.0 - saturation );
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tex.a = opacity;
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if( sourceAlpha != 1.0 || brightness != 1.0 )
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{
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tex.rgb = tex.rgb * opacityByBrightness;
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if( sourceAlpha != 1.0 )
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tex.a = sourceAlpha * opacity;
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}
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}
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else if( opacity != 1.0 || brightness != 1.0 )
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{
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tex.rgb = tex.rgb * opacityByBrightness;
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tex.a = tex.a * opacity;
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}
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gl_FragColor = tex;
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}
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else
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{
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gl_FragColor = gl_Color;
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}
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}
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