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https://github.com/scratchfoundation/bgfx.git
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21 lines
580 B
Text
21 lines
580 B
Text
uniform sampler2D mainTex;
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varying vec2 uv;
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void main()
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{
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vec4 c = vec4(0.0);
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// various loop forms
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for (int i = 0; i < 100; ++i)
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c.x += texture2D (mainTex, uv + vec2(i,i)).r;
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for (int i = 0; i <= 100; i += 3)
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c.x += texture2D (mainTex, uv + vec2(i,i)).r;
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for (int i = 100; i >= 0; --i)
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c.x += texture2D (mainTex, uv + vec2(i,i)).r;
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int n = int(c.x * 10.0);
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for (int i = 3; i < n; ++i)
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c.x += texture2D (mainTex, uv + vec2(i,i)).r;
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for (int i = 1, j = 2; i < 100 && j < 50; i += 2, j += 3)
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c.x += texture2D (mainTex, uv + vec2(i,j)).r;
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gl_FragColor = c;
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}
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