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authorAdrian Kummerlaender2019-02-25 19:57:11 +0100
committerAdrian Kummerlaender2019-02-25 19:57:11 +0100
commit26c1cf58f483e64d80703fe37c4bd3923d1ff5b7 (patch)
tree7cfd9a7a6a919d0879a096ff1f9b27200800ec56 /src/shader/code
parentdbac2c0b8722e17ea211fc47a6fd92f8db48402e (diff)
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Merge streaming into collide shaderpattern/ab
i.e. implement the A-B pattern. Dispatching only one compute shader per interaction-less simulation step already yields very noticeable performance gains. All cell types are now fully handled by the collide shader which further simplifies the code.
Diffstat (limited to 'src/shader/code')
-rw-r--r--src/shader/code/collide.glsl36
-rw-r--r--src/shader/code/stream.glsl82
2 files changed, 28 insertions, 90 deletions
diff --git a/src/shader/code/collide.glsl b/src/shader/code/collide.glsl
index 673a285..4efd7fb 100644
--- a/src/shader/code/collide.glsl
+++ b/src/shader/code/collide.glsl
@@ -61,7 +61,7 @@ float get(uint x, uint y, int i, int j) {
}
void set(uint x, uint y, int i, int j, float v) {
- collideCells[indexOfLatticeCell(x,y) + indexOfDirection(i,j)] = v;
+ streamCells[indexOfLatticeCell(x,y) + indexOfDirection(i,j)] = v;
}
void setFluid(uint x, uint y, vec2 v) {
@@ -105,6 +105,18 @@ bool isBulkFluidCell(int material) {
return material == 1 || material == 4 || material == 5 || material == 6;
}
+bool isBounceBackCell(int material) {
+ return material == 2 || material == 3;
+}
+
+bool isInflowCell(int material) {
+ return material == 5;
+}
+
+bool isOutflowCell(int material) {
+ return material == 6;
+}
+
float getExternalMassInflux(int material) {
if ( material == 4 ) {
return 1.5;
@@ -113,7 +125,7 @@ float getExternalMassInflux(int material) {
}
};
-/// Actual collide kernel
+/// Actual collide&stream kernel
void main() {
const uint x = gl_GlobalInvocationID.x;
@@ -125,14 +137,14 @@ void main() {
const int material = getMaterial(x,y);
- if ( isBulkFluidCell(material) ) {
- float d = max(density(x,y), getExternalMassInflux(material));
- vec2 v = velocity(x,y,d);
+ float d = max(density(x,y), getExternalMassInflux(material));
+ vec2 v = velocity(x,y,d);
- if ( material == 5 ) {
+ if ( isBulkFluidCell(material) ) {
+ if ( isInflowCell(material) ) {
v = vec2(0.1,0.0);
}
- if ( material == 6 ) {
+ if ( isOutflowCell(material) ) {
d = 1.0;
}
@@ -140,7 +152,15 @@ void main() {
for ( int i = -1; i <= 1; ++i ) {
for ( int j = -1; j <= 1; ++j ) {
- set(x,y,i,j, get(x,y,i,j) + omega * (equilibrium(d,v,i,j) - get(x,y,i,j)));
+ set(x+i,y+j,i,j, get(x,y,i,j) + omega * (equilibrium(d,v,i,j) - get(x,y,i,j)));
+ }
+ }
+ }
+
+ if ( isBounceBackCell(material) ) {
+ for ( int i = -1; i <= 1; ++i ) {
+ for ( int j = -1; j <= 1; ++j ) {
+ set(x+(-1)*i,y+(-1)*j,(-1)*i,(-1)*j, get(x,y,i,j) + omega * (equilibrium(d,v,i,j) - get(x,y,i,j)));
}
}
}
diff --git a/src/shader/code/stream.glsl b/src/shader/code/stream.glsl
deleted file mode 100644
index 59aed98..0000000
--- a/src/shader/code/stream.glsl
+++ /dev/null
@@ -1,82 +0,0 @@
-static const std::string STREAM_SHADER_CODE = R"(
-#version 430
-
-layout (local_size_x = 1, local_size_y = 1) in;
-
-layout (std430, binding=1) buffer bufferCollide { float collideCells[]; };
-layout (std430, binding=2) buffer bufferStream { float streamCells[]; };
-layout (std430, binding=3) buffer bufferFluid { float fluidCells[]; };
-
-/// LBM constants
-
-uniform uint nX;
-uniform uint nY;
-
-const uint q = 9;
-
-// Array indexing
-
-uint indexOfDirection(int i, int j) {
- return 3*(i+1) + (j+1);
-}
-
-uint indexOfLatticeCell(uint x, uint y) {
- return q*nX*y + q*x;
-}
-
-uint indexOfFluidVertex(uint x, uint y) {
- return 3*nX*y + 3*x;
-}
-
-/// Data access
-
-float get(uint x, uint y, int i, int j) {
- return collideCells[indexOfLatticeCell(x,y) + indexOfDirection(i,j)];
-}
-
-void set(uint x, uint y, int i, int j, float v) {
- streamCells[indexOfLatticeCell(x,y) + indexOfDirection(i,j)] = v;
-}
-
-int getMaterial(uint x, uint y) {
- const uint idx = indexOfFluidVertex(x, y);
- return int(fluidCells[idx + 2]);
-}
-
-/// Boundary conditions
-
-void bounceBack(uint x, uint y) {
- for ( int i = -1; i <= 1; ++i ) {
- for ( int j = -1; j <= 1; ++j ) {
- set(x,y,i,j, get(x,y,(-1)*i,(-1)*j));
- }
- }
-}
-
-/// Actual stream kernel
-
-void main() {
- const uint x = gl_GlobalInvocationID.x;
- const uint y = gl_GlobalInvocationID.y;
-
- if ( !(x < nX && y < nY) ) {
- return;
- }
-
- const int material = getMaterial(x,y);
-
- if ( material == 0 ) {
- return;
- }
-
- if ( material == 2 || material == 3 ) {
- bounceBack(x,y);
- }
-
- for ( int i = -1; i <= 1; ++i ) {
- for ( int j = -1; j <= 1; ++j ) {
- set(x+i,y+j,i,j, get(x,y,i,j));
- }
- }
-}
-)";