40 lines
1.1 KiB
GLSL
40 lines
1.1 KiB
GLSL
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uniform sampler2D windowTex;
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uniform sampler2D backgroundTex;
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uniform float displayWidth;
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uniform float displayHeight;
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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 / displayWidth, pix.y / displayHeight);
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}
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// Returns color of the window at given texture coordinate, taking into
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// account opacity, brightness and saturation
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vec4 windowColor(vec2 texcoord)
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{
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vec3 color = texture2D(windowTex, texcoord).rgb;
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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 = mix(vec3(grayscale), color, saturation);
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// Apply brightness
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color = color * brightness;
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// Apply opacity and return
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return vec4(color, opacity);
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}
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void main()
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{
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vec2 texcoord = (gl_TexCoord[0] * gl_TextureMatrix[0]).xy;
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vec2 blurtexcoord = pix2tex(gl_FragCoord.xy); //(gl_FragCoord * gl_TextureMatrix[4]).xy;
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vec3 tex = mix(texture2D(backgroundTex, blurtexcoord).rgb,
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windowColor(texcoord).rgb, opacity);
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gl_FragColor = vec4(tex, 1.0);
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}
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