Joonas Rikkonen
29 lines
616 B
HLSL
29 lines
616 B
HLSL
// vim:ft=hlsl
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float seed;
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float intensity;
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float4 grainColor;
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float nrand(float2 uv)
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{
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return frac(sin(dot(uv, float2(12.9898, 78.233) * seed)) * 43758.5453);
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}
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float4 grain(float4 position : SV_POSITION, float4 clr : COLOR0, float2 texCoord : TEXCOORD0) : COLOR0
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{
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float4 baseColor = grainColor;
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float4 color = baseColor * nrand(texCoord);
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float2 center = { 0.5, 0.5 };
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float2 diff = texCoord - center;
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float alpha = diff.x * diff.x + diff.y * diff.y;
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color.a = alpha * intensity;
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return color;
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}
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technique Grain
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{
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pass Pass1
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{
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PixelShader = compile ps_4_0_level_9_1 grain();
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}
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}
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