25 lines
767 B
GLSL
25 lines
767 B
GLSL
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uniform sampler2D sceneTex;
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uniform float textureWidth;
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uniform float textureHeight;
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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, 1.0 - pix.y / textureHeight);
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}
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void main()
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{
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float amount = 0.4;
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vec3 tex = texture2D(sceneTex, pix2tex(gl_TexCoord[0].xy)).rgb * (1.0 + 4.0 * amount);
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tex -= texture2D(sceneTex, pix2tex(gl_TexCoord[0].xy + vec2(0.0, 1.0))).rgb * amount;
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tex -= texture2D(sceneTex, pix2tex(gl_TexCoord[0].xy + vec2(0.0, -1.0))).rgb * amount;
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tex -= texture2D(sceneTex, pix2tex(gl_TexCoord[0].xy + vec2(1.0, 0.0))).rgb * amount;
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tex -= texture2D(sceneTex, pix2tex(gl_TexCoord[0].xy + vec2(-1.0, 0.0))).rgb * amount;
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gl_FragColor = vec4(tex, 1.0);
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}
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