214 lines
No EOL
7.4 KiB
C
214 lines
No EOL
7.4 KiB
C
//--------------------------------------------------------------------------------------
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// Defines
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//--------------------------------------------------------------------------------------
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#define LEFTCELL float3 (input.LR.x, input.texcoords.y, input.texcoords.z)
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#define RIGHTCELL float3 (input.LR.y, input.texcoords.y, input.texcoords.z)
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#define BOTTOMCELL float3 (input.texcoords.x, input.BT.x, input.texcoords.z)
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#define TOPCELL float3 (input.texcoords.x, input.BT.y, input.texcoords.z)
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#define DOWNCELL float3 (input.texcoords.x, input.texcoords.y, input.DU.x)
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#define UPCELL float3 (input.texcoords.x, input.texcoords.y, input.DU.y)
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// 1.73 - voxel diagonal length
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#define BOX_EXPANSION 1.73
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//--------------------------------------------------------------------------------------
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// Textures
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//--------------------------------------------------------------------------------------
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Texture3D Texture_velocity0;
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Texture3D Texture_velocity1;
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Texture3D Texture_color;
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Texture3D Texture_obstacles;
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Texture3D Texture_obstvelocity;
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Texture3D Texture_pressure;
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Texture3D Texture_tempscalar;
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Texture3D Texture_tempvector;
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//--------------------------------------------------------------------------------------
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// Samplers
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//--------------------------------------------------------------------------------------
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sampler samPointClamp;
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sampler samLinear;
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//--------------------------------------------------------------------------------------
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// Variables
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//--------------------------------------------------------------------------------------
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cbuffer FluidSimConfig
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{
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float textureHeight;
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float textureWidth;
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float textureDepth;
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float modulate = 1.0;
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float epsilon;
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float timestep;
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float forward = 1.0;
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float4 floatVolumeDim; // Actually float3. We don't support float3 and float2
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}
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cbuffer AABBBounds
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{
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float4 boxLBDcorner; // float3
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float4 boxRTUcorner; // float3
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}
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cbuffer EmitterParams
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{
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float size;
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float4 center; // Actually float3. We don't support float3 and float2
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float4 splatColor;
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}
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cbuffer OOBBClipPlanes
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{
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float4 OOBBClipPlane[6];
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// 0 - Top
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// 1 - Bottom
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}
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// For fire simulation. Fuel extinction speed.
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static const float k = 0.006;
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/////////////////////////////////////////////////////////////////
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// Structs
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/////////////////////////////////////////////////////////////////
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// fluidsim
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struct v_fluidsim
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{
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float3 position : POSITION; // 2D slice vertex coordinates in clip space
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float3 textureCoords0 : TEXCOORD; // 3D cell coordinates (x,y,z in 0-dimension range)
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};
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struct v2g_fluidsim
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{
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float3 cell0 : TEXCOORD0;
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float3 texcoords : TEXCOORD1;
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float2 LR : TEXCOORD2;
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float2 BT : TEXCOORD3;
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float2 DU : TEXCOORD4;
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float4 pos : SV_Position;
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};
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struct g2p_fluidsim
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{
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float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
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float3 texcoords : TEXCOORD1; // 3D cell texcoords (x,y,z in 0-1 range)
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float2 LR : TEXCOORD2; // 3D cell texcoords for the Left and Right neighbors
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float2 BT : TEXCOORD3; // 3D cell texcoords for the Bottom and Top neighbors
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float2 DU : TEXCOORD4; // 3D cell texcoords for the Down and Up neighbors
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float4 pos : SV_Position; // 2D slice vertex coordinates in homogenous clip space
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uint RTIndex : SV_RenderTargetArrayIndex; // used to choose the destination slice
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};
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struct p_fluidsim
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{
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float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
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float3 texcoords : TEXCOORD1; // 3D cell texcoords (x,y,z in 0-1 range)
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float2 LR : TEXCOORD2; // 3D cell texcoords for the Left and Right neighbors
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float2 BT : TEXCOORD3; // 3D cell texcoords for the Bottom and Top neighbors
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float2 DU : TEXCOORD4; // 3D cell texcoords for the Down and Up neighbors
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};
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/////////////////////////////////////////////////////////////////
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// fluidsim_clip
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// TODO: DX10: These structures are used for obstacle rendering. Remove unused fields.
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struct v2g_fluidsim_clip
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{
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float3 cell0 : TEXCOORD0;
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float3 texcoords : TEXCOORD1;
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float2 LR : TEXCOORD2;
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float2 BT : TEXCOORD3;
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float2 DU : TEXCOORD4;
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float3 clip0 : SV_ClipDistance0;
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float3 clip1 : SV_ClipDistance1;
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float4 pos : SV_Position;
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};
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struct g2p_fluidsim_clip
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{
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float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
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float3 texcoords : TEXCOORD1; // 3D cell texcoords (x,y,z in 0-1 range)
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float2 LR : TEXCOORD2; // 3D cell texcoords for the Left and Right neighbors
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float2 BT : TEXCOORD3; // 3D cell texcoords for the Bottom and Top neighbors
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float2 DU : TEXCOORD4; // 3D cell texcoords for the Down and Up neighbors
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float3 clip0 : SV_ClipDistance0;
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float3 clip1 : SV_ClipDistance1;
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float4 pos : SV_Position; // 2D slice vertex coordinates in homogenous clip space
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uint RTIndex : SV_RenderTargetArrayIndex; // used to choose the destination slice
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};
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struct p_fluidsim_clip
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{
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float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
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float3 texcoords : TEXCOORD1; // 3D cell texcoords (x,y,z in 0-1 range)
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float2 LR : TEXCOORD2; // 3D cell texcoords for the Left and Right neighbors
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float2 BT : TEXCOORD3; // 3D cell texcoords for the Bottom and Top neighbors
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float2 DU : TEXCOORD4; // 3D cell texcoords for the Down and Up neighbors
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float3 clip0 : SV_ClipDistance0;
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float3 clip1 : SV_ClipDistance1;
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};
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/////////////////////////////////////////////////////////////////
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// fluidsim_clip
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// TODO: DX10: These structures are used for obstacle rendering. Remove unused fields.
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struct v2g_fluidsim_dyn_aabb
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{
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float3 cell0 : TEXCOORD0;
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float3 velocity : TEXCOORD1;
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float3 clip0 : SV_ClipDistance0;
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float3 clip1 : SV_ClipDistance1;
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float4 pos : SV_Position;
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};
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struct g2p_fluidsim_dyn_aabb
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{
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float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
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float3 velocity : TEXCOORD1; // speed of the point in local space
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float3 clip0 : SV_ClipDistance0;
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float3 clip1 : SV_ClipDistance1;
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float4 pos : SV_Position; // 2D slice vertex coordinates in homogenous clip space
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uint RTIndex : SV_RenderTargetArrayIndex; // used to choose the destination slice
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};
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struct p_fluidsim_dyn_aabb
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{
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float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
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float3 velocity : TEXCOORD1;
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float3 clip0 : SV_ClipDistance0;
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float3 clip1 : SV_ClipDistance1;
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};
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//--------------------------------------------------------------------------------------
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// Helper functions
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//--------------------------------------------------------------------------------------
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float4 GetObstVelocity( float3 cellTexCoords )
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{
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return Texture_obstvelocity.SampleLevel(samPointClamp, cellTexCoords, 0);
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}
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bool IsNonEmptyCell( float3 cellTexCoords )
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{
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return (Texture_obstacles.SampleLevel(samPointClamp, cellTexCoords, 0).r > 0.0);
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}
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bool IsBoundaryCell( float3 cellTexCoords )
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{
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return (Texture_obstacles.SampleLevel(samPointClamp, cellTexCoords, 0).r > 0.9);
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}
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float3 GetAdvectedPosTexCoords(p_fluidsim input)
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{
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float3 pos = input.cell0;
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pos -= timestep * forward *
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Texture_velocity0.SampleLevel( samPointClamp, input.texcoords, 0 ).xyz;
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return float3(pos.x/textureWidth, pos.y/textureHeight, (pos.z+0.5)/textureDepth);
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} |