wehub-resource-sync
87 lines
1.9 KiB
HLSL
87 lines
1.9 KiB
HLSL
cbuffer Resolution : register(b1)
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{
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float TargetWidth;
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float TargetHeight;
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}
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struct vsOutput
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{
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float4 position : SV_POSITION;
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float2 texCoord : TEXCOORD;
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};
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Texture2D<float4> Image : register(t0);
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sampler Sampler : register(s0);
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#define PI 3.14159265359
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float4 psMain(vsOutput input) : SV_TARGET
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{
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float width, height;
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Image.GetDimensions(width, height);
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float4 c=float4(1,1,0,1);
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float2 uv = input.texCoord;
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// from Bartosz
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// https://stackoverflow.com/questions/34250742/converting-a-cubemap-into-equirectangular-panorama
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float phi = input.texCoord.x * PI * 2;
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float theta = input.texCoord.y * PI;
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float x = sin(phi) * sin(theta) * -1;
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float y = cos(theta);
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float z = cos(phi) * sin(theta) * -1;
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float a = max(abs(x), max(abs(y), abs(z)));
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float xa = x / a;
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float ya = y / a;
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float za = z / a;
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c.rgb = float3(x,y,z);
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if (abs(xa - 1.0) < 1e-3f) // Use consistent epsilon
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{
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uv = (float2(-za, -ya)+1)/2;
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uv.x /= 6;
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uv.x += 0./6.;
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c.rgb = Image.Sample(Sampler, uv);
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}
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else if (abs(xa+1.) < 1e-3f)
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{
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uv = (float2(za, -ya)+1)/2;
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uv.x /= 6;
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uv.x += 2./6.;
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c.rgb = Image.Sample(Sampler, uv);
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}
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else if (abs(za-1.) < 1e-3f)
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{
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uv = (float2(xa, -ya)+1)/2;
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uv.x /= 6;
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uv.x += 3./6.;
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c.rgb = Image.Sample(Sampler, uv);
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}
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else if (abs(za+1.) < 1e-3f)
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{
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uv = (float2(-xa, -ya)+1)/2;
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uv.x /= 6;
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uv.x += 1./6.;
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c.rgb = Image.Sample(Sampler, uv);
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}
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else if (abs(ya-1.) < 1e-3f)
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{
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uv = (float2(-xa, -za)+1)/2;
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uv.x /= 6;
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uv.x += 4./6.;
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c.rgb = Image.Sample(Sampler, uv);
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}
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else if (abs(ya+1.) < 1e-3f)
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{
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uv = (float2(xa, -za)+1)/2;
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uv.x /= 6;
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uv.x += 5./6.;
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c.rgb = Image.Sample(Sampler, uv);
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}
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return c;
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} |