31 lines
587 B
GLSL
31 lines
587 B
GLSL
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uniform sampler2D source;
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uniform sampler2D destination;
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uniform vec4 subRect;
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uniform float opacity;
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void main()
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{
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vec2 coor = gl_TexCoord[0].xy;
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vec2 dstCoor = (coor - subRect.xy) * subRect.zw;
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vec4 srcFrag = texture2D(source, coor);
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vec4 dstFrag = texture2D(destination, dstCoor);
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vec4 resFrag;
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float ab = opacity;
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const float as = srcFrag.a;
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const float ad = dstFrag.a;
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const float at = ab*as;
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resFrag.a = at + ad - ad*at;
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resFrag.rgb = mix(dstFrag.rgb, srcFrag.rgb, ab*as);
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resFrag.rgb = mix(srcFrag.rgb, resFrag.rgb, ad*resFrag.a);
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gl_FragColor = resFrag;
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}
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