store geometry struct in shared memory. this increases photon propagation speed from 3.3M -> 3.45!.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/render.cu b/src/render.cu
index 005950f..d4ed443 100644
--- a/src/render.cu
+++ b/src/render.cu
@@ -39,11 +39,20 @@ render(int nthreads, float3 *_origin, float3 *_direction, Geometry *g,
        unsigned int alpha_depth, unsigned int *pixels, float *_dx,
        unsigned int *dxlen, float4 *_color)
 {
+    __shared__ Geometry sg;
+
+    if (threadIdx.x == 0)
+	sg = *g;
+
+    __syncthreads();
+
     int id = blockIdx.x*blockDim.x + threadIdx.x;
 	
     if (id >= nthreads)
 	return;
 
+    g = &sg;
+
     float3 origin = _origin[id];
     float3 direction = _direction[id];
     unsigned int n = dxlen[id];