41 lines
1.1 KiB
GLSL
41 lines
1.1 KiB
GLSL
uniform sampler2D windowTex;
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uniform sampler2D backgroundTex;
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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 saturation;
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uniform float brightness;
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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.x / textureWidth, pix.y / textureHeight);
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}
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// Returns color of the window at given texture coordinate, taking into
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// account brightness and saturation, but not opacity
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vec4 windowColor(vec2 texcoord)
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{
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vec4 color = texture2D(windowTex, texcoord);
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// Apply saturation
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float grayscale = dot(vec3(0.30, 0.59, 0.11), color.rgb);
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color.rgb = mix(vec3(grayscale), color.rgb, saturation);
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// Apply brightness
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color.rgb = color.rgb * brightness;
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// and return
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return color;
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}
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void main()
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{
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vec2 blurtexcoord = pix2tex(gl_FragCoord.xy);
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vec4 winColor = windowColor(gl_TexCoord[0].xy);
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vec3 tex = mix(texture2D(backgroundTex, blurtexcoord).rgb,
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winColor.rgb, winColor.a * opacity);
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gl_FragColor = vec4(tex, pow(winColor.a, 0.2));
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}
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