wehub-resource-sync
122 lines
2.7 KiB
HLSL
122 lines
2.7 KiB
HLSL
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static const float3 Quad[] =
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{
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// xy front
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float3(-1, -1, 1),
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float3( 1, -1, 1),
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float3( 1, 1, 1),
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float3( 1, 1, 1),
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float3(-1, 1, 1),
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float3(-1, -1, 1),
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// yz right
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float3(1, -1, 1),
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float3(1, -1, -1),
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float3(1, 1, -1),
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float3(1, 1, -1),
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float3(1, 1, 1),
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float3(1, -1, 1),
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// xz top
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float3(-1, 1, 1),
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float3( 1, 1, 1),
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float3( 1, 1, -1),
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float3( 1, 1, -1),
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float3(-1, 1, -1),
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float3(-1, 1, 1),
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// xy back
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float3( 1, -1, -1),
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float3(-1, -1, -1),
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float3(-1, 1, -1),
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float3(-1, 1, -1),
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float3( 1, 1, -1),
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float3( 1, -1, -1),
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// yz left
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float3(-1, -1, -1),
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float3(-1, -1, 1),
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float3(-1, 1, 1),
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float3(-1, 1, 1),
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float3(-1, 1, -1),
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float3(-1, -1, -1),
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// xz bottom
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float3( 1, -1, -1),
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float3( 1, -1, 1),
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float3(-1, -1, 1),
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float3(-1, -1, 1),
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float3(-1, -1, -1),
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float3( 1, -1, -1),
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};
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cbuffer Transforms : register(b0)
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{
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float4x4 CameraToClipSpace;
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float4x4 ClipSpaceToCamera;
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float4x4 WorldToCamera;
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float4x4 CameraToWorld;
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float4x4 WorldToClipSpace;
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float4x4 ClipSpaceToWorld;
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float4x4 ObjectToWorld;
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float4x4 WorldToObject;
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float4x4 ObjectToCamera;
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float4x4 ObjectToClipSpace;
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};
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cbuffer Params : register(b1)
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{
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float4 Color;
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float3 Size;
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};
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Texture3D<float4> VolumeTexture : register(t0);
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sampler texSampler : register(s0);
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struct vsOutput
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{
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float4 position : SV_POSITION;
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float3 posInWorld : POSITION0;
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float3 texCoord : TEXCOORD;
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};
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vsOutput vsMain(uint vertexId: SV_VertexID)
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{
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vsOutput output;
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float3 quadVertex = Quad[vertexId].xyz;
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float3 quadVertexInObject = quadVertex * Size * 0.5;
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output.position = mul(float4(quadVertexInObject, 1), ObjectToClipSpace);
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output.texCoord = Quad[vertexId]*float3(0.5, 0.5, 0.5) + 0.5;
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output.posInWorld = mul(float4(quadVertexInObject, 1), ObjectToWorld);
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return output;
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}
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float4 psMainOnlyColor(vsOutput input) : SV_TARGET
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{
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float3 uvw = input.texCoord;
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const int NUM_SAMPLES = 25;
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float4 vDir = float4(input.posInWorld - CameraToWorld[3].xyz, 0);
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float3 viewDirInObject = mul(vDir, WorldToObject );
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float3 sampleStep = normalize(viewDirInObject)/float(NUM_SAMPLES);
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float3 c = 0.0;
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float alpha = 0.0;
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for (int i = 0; i < NUM_SAMPLES; i++) {
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float3 s = VolumeTexture.Sample(texSampler, uvw);
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float a = s*(1.0 - alpha);
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c += s*a;
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alpha += a;
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if (alpha > 0.99)
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break;
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uvw += sampleStep;
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if (max(max(uvw.x, uvw.y), uvw.z) > 1.0)
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break;
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if (min(min(uvw.x, uvw.y), uvw.z) < 0.0)
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break;
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}
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// c = vDir;
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// c = viewDirInObject;
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c *= input.texCoord;
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return float4(c , alpha);
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return float4(c , 1);
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}
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