88 lines
2.3 KiB
C++
Executable File
88 lines
2.3 KiB
C++
Executable File
// ======================================================================
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// functions.inc
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// HLSL vertex shader functions
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// ======================================================================
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float lengthSquared(float3 v)
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{
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return dot(v, v);
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}
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// ----------------------------------------------------------------------
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float3 signAndBias(float3 v)
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{
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return (v - 0.5) * 2.0;
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}
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// ----------------------------------------------------------------------
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float3 reverseSignAndBias(float3 v)
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{
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return (v * 0.5) + 0.5;
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}
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// ----------------------------------------------------------------------
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float3 tex2DDxt5CompressedNormal(sampler map, float2 tcs)
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{
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float4 pixel = tex2D(map, tcs);
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float3 normal = { pixel.a, pixel.y, 1 };
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normal = signAndBias(normal);
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normal.z = sqrt(1 - (normal.x * normal.x + normal.y * normal.y));
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return normal;
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}
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// ----------------------------------------------------------------------
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float3 tex2DDxt5CompressedNormal_ps_14( sampler map, float2 tcs )
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{
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float4 pixel = tex2D( map, tcs );
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float3 normal = { pixel.a, pixel.y, pixel.z };
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normal = signAndBias( normal );
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normal.z = 1.0f - (normal.x * normal.x + normal.y * normal.y);
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// no sqrt( ) available, so we must approximate it
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if (normal.z >= 0.24)
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{
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normal.z = (normal.z * 0.6667) + 0.375;
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}
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else
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{
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normal.z = (normal.z * 1.6667) + 0.15;
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}
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return normal;
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}
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// ----------------------------------------------------------------------
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float3 tex2DDxt5CompressedNormal_ps_14_min_constants( sampler map, float2 tcs )
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{
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float4 pixel = tex2D( map, tcs );
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float3 normal = { pixel.a, pixel.y, pixel.z };
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normal = signAndBias( normal );
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float zSquared = 1.0f - (normal.x * normal.x + normal.y * normal.y);
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// slightly creative rework of above method to reduce instructions and constants
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// no sqrt( ) available, so we must approximate it
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normal.z = (zSquared * 0.6667) + 0.375;
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zSquared -= 0.225; // subtracting the 0.375 that was added to normal.z above and adding 0.15 before the comparison
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if (zSquared < 0)
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{
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normal.z += zSquared;
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}
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return normal;
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}
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// ----------------------------------------------------------------------
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float intensity(float3 rgb)
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{
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return dot(rgb, float3(0.3f, 0.59f, 0.11f));
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}
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// ======================================================================
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