init

gamedata/shaders/d3d11/fluid_common.hlsli

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+//--------------------------------------------------------------------------------------
+// Defines
+//--------------------------------------------------------------------------------------
+
+#define LEFTCELL float3(input.LR.x, input.texcoords.y, input.texcoords.z)
+#define RIGHTCELL float3(input.LR.y, input.texcoords.y, input.texcoords.z)
+#define BOTTOMCELL float3(input.texcoords.x, input.BT.x, input.texcoords.z)
+#define TOPCELL float3(input.texcoords.x, input.BT.y, input.texcoords.z)
+#define DOWNCELL float3(input.texcoords.x, input.texcoords.y, input.DU.x)
+#define UPCELL float3(input.texcoords.x, input.texcoords.y, input.DU.y)
+
+//	1.73 - voxel diagonal length
+#define BOX_EXPANSION 1.73
+
+//--------------------------------------------------------------------------------------
+// Textures
+//--------------------------------------------------------------------------------------
+
+Texture3D Texture_velocity0;
+Texture3D Texture_velocity1;
+Texture3D Texture_color;
+Texture3D Texture_obstacles;
+Texture3D Texture_obstvelocity;
+Texture3D Texture_pressure;
+Texture3D Texture_tempscalar;
+Texture3D Texture_tempvector;
+
+//--------------------------------------------------------------------------------------
+// Samplers
+//--------------------------------------------------------------------------------------
+
+sampler samPointClamp;
+sampler samLinear;
+
+//--------------------------------------------------------------------------------------
+// Variables
+//--------------------------------------------------------------------------------------
+
+cbuffer FluidSimConfig
+{
+    float textureHeight;
+    float textureWidth;
+    float textureDepth;
+
+    float modulate = 1.0;
+    float epsilon;
+    float timestep;
+    float forward = 1.0;
+    float4 floatVolumeDim; //	Actually float3. We don't support float3 and float2
+}
+
+cbuffer AABBBounds
+{
+    float4 boxLBDcorner; //	float3
+    float4 boxRTUcorner; //	float3
+}
+
+cbuffer EmitterParams
+{
+    float size;
+    float4 center; //	Actually float3. We don't support float3 and float2
+    float4 splatColor;
+}
+
+cbuffer OOBBClipPlanes
+{
+    float4 OOBBClipPlane[6];
+    //	0 - Top
+    //	1 - Bottom
+}
+
+//	For fire simulation. Fuel extinction speed.
+static const float k = 0.006;
+
+/////////////////////////////////////////////////////////////////
+//	Structs
+
+/////////////////////////////////////////////////////////////////
+//	fluidsim
+struct v_fluidsim
+{
+    float3 position : POSITION; // 2D slice vertex coordinates in clip space
+    float3 textureCoords0 : TEXCOORD; // 3D cell coordinates (x,y,z in 0-dimension range)
+};
+
+struct v2g_fluidsim
+{
+    float3 cell0 : TEXCOORD0;
+    float3 texcoords : TEXCOORD1;
+    float2 LR : TEXCOORD2;
+    float2 BT : TEXCOORD3;
+    float2 DU : TEXCOORD4;
+    float4 pos : SV_POSITION;
+};
+
+struct g2p_fluidsim
+{
+    float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
+    float3 texcoords : TEXCOORD1; // 3D cell texcoords (x,y,z in 0-1 range)
+    float2 LR : TEXCOORD2; // 3D cell texcoords for the Left and Right neighbors
+    float2 BT : TEXCOORD3; // 3D cell texcoords for the Bottom and Top neighbors
+    float2 DU : TEXCOORD4; // 3D cell texcoords for the Down and Up neighbors
+    float4 pos : SV_POSITION; // 2D slice vertex coordinates in homogenous clip space
+    uint RTIndex : SV_RenderTargetArrayIndex; // used to choose the destination slice
+};
+
+struct p_fluidsim
+{
+    float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
+    float3 texcoords : TEXCOORD1; // 3D cell texcoords (x,y,z in 0-1 range)
+    float2 LR : TEXCOORD2; // 3D cell texcoords for the Left and Right neighbors
+    float2 BT : TEXCOORD3; // 3D cell texcoords for the Bottom and Top neighbors
+    float2 DU : TEXCOORD4; // 3D cell texcoords for the Down and Up neighbors
+};
+
+/////////////////////////////////////////////////////////////////
+//	fluidsim_clip
+//	TODO: DX10: These structures are used for obstacle rendering. Remove unused fields.
+
+struct v2g_fluidsim_clip
+{
+    float3 cell0 : TEXCOORD0;
+    float3 texcoords : TEXCOORD1;
+    float2 LR : TEXCOORD2;
+    float2 BT : TEXCOORD3;
+    float2 DU : TEXCOORD4;
+    float3 clip0 : SV_ClipDistance0;
+    float3 clip1 : SV_ClipDistance1;
+    float4 pos : SV_POSITION;
+};
+
+struct g2p_fluidsim_clip
+{
+    float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
+    float3 texcoords : TEXCOORD1; // 3D cell texcoords (x,y,z in 0-1 range)
+    float2 LR : TEXCOORD2; // 3D cell texcoords for the Left and Right neighbors
+    float2 BT : TEXCOORD3; // 3D cell texcoords for the Bottom and Top neighbors
+    float2 DU : TEXCOORD4; // 3D cell texcoords for the Down and Up neighbors
+    float3 clip0 : SV_ClipDistance0;
+    float3 clip1 : SV_ClipDistance1;
+    float4 pos : SV_POSITION; // 2D slice vertex coordinates in homogenous clip space
+    uint RTIndex : SV_RenderTargetArrayIndex; // used to choose the destination slice
+};
+
+struct p_fluidsim_clip
+{
+    float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
+    float3 texcoords : TEXCOORD1; // 3D cell texcoords (x,y,z in 0-1 range)
+    float2 LR : TEXCOORD2; // 3D cell texcoords for the Left and Right neighbors
+    float2 BT : TEXCOORD3; // 3D cell texcoords for the Bottom and Top neighbors
+    float2 DU : TEXCOORD4; // 3D cell texcoords for the Down and Up neighbors
+    float3 clip0 : SV_ClipDistance0;
+    float3 clip1 : SV_ClipDistance1;
+};
+
+/////////////////////////////////////////////////////////////////
+//	fluidsim_clip
+//	TODO: DX10: These structures are used for obstacle rendering. Remove unused fields.
+
+struct v2g_fluidsim_dyn_aabb
+{
+    float3 cell0 : TEXCOORD0;
+    float3 velocity : TEXCOORD1;
+    float3 clip0 : SV_ClipDistance0;
+    float3 clip1 : SV_ClipDistance1;
+    float4 pos : SV_POSITION;
+};
+
+struct g2p_fluidsim_dyn_aabb
+{
+    float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
+    float3 velocity : TEXCOORD1; // speed of the point in local space
+    float3 clip0 : SV_ClipDistance0;
+    float3 clip1 : SV_ClipDistance1;
+    float4 pos : SV_POSITION; // 2D slice vertex coordinates in homogenous clip space
+    uint RTIndex : SV_RenderTargetArrayIndex; // used to choose the destination slice
+};
+
+struct p_fluidsim_dyn_aabb
+{
+    float3 cell0 : TEXCOORD0; // 3D cell coordinates (x,y,z in 0-dimension range)
+    float3 velocity : TEXCOORD1;
+    float3 clip0 : SV_ClipDistance0;
+    float3 clip1 : SV_ClipDistance1;
+};
+
+//--------------------------------------------------------------------------------------
+// Helper functions
+//--------------------------------------------------------------------------------------
+
+float4 GetObstVelocity(float3 cellTexCoords)
+{
+    return Texture_obstvelocity.SampleLevel(samPointClamp, cellTexCoords, 0);
+}
+
+bool IsNonEmptyCell(float3 cellTexCoords)
+{
+    return (Texture_obstacles.SampleLevel(samPointClamp, cellTexCoords, 0).r > 0.0);
+}
+
+bool IsBoundaryCell(float3 cellTexCoords)
+{
+    return (Texture_obstacles.SampleLevel(samPointClamp, cellTexCoords, 0).r > 0.9);
+}
+
+float3 GetAdvectedPosTexCoords(p_fluidsim input)
+{
+    float3 pos = input.cell0;
+
+    pos -= timestep * forward *
+        Texture_velocity0.SampleLevel(samPointClamp, input.texcoords, 0).xyz;
+
+    return float3(pos.x / textureWidth, pos.y / textureHeight, (pos.z + 0.5) / textureDepth);
+}