Increase alpha depth for complex models. Remove intermediate rounding

to integers in alpha blending until the last step.

1 files changed, 11 insertions, 8 deletions

diff --git a/src/alpha.h b/src/alpha.h
index afd7ea5..5e3e803 100644
--- a/src/alpha.h
+++ b/src/alpha.h
@@ -13,7 +13,7 @@ __device__ void swap(T &a, T &b)
 	b = temp;
 }
 
-#define ALPHA_DEPTH 5
+#define ALPHA_DEPTH 10
 
 struct HitList
 {
@@ -121,10 +121,10 @@ __device__ __noinline__ int get_color_alpha(const float3 &origin, const float3&
 	if (h.size < 1)
 		return 0;
 
-	float scale = 1.0;
-	unsigned int r = 0;
-	unsigned int g = 0;
-	unsigned int b = 0;
+	float scale = 1.0f;
+	float fr = 0.0f;
+	float fg = 0.0f;
+	float fb = 0.0f;
 	for (i=0; i < h.size; i++)
 	{
 		uint4 triangle_data = g_triangles[h.indices[i]];
@@ -144,12 +144,15 @@ __device__ __noinline__ int get_color_alpha(const float3 &origin, const float3&
 
 		float alpha = (255 - (0xff & (g_colors[h.indices[i]] >> 24)))/255.0f;
 
-		r += floorf(r0*scale*cos_theta*alpha);
-		g += floorf(g0*scale*cos_theta*alpha);
-		b += floorf(b0*scale*cos_theta*alpha);
+		fr += r0*scale*cos_theta*alpha;
+		fg += g0*scale*cos_theta*alpha;
+		fb += b0*scale*cos_theta*alpha;
 
 		scale *= (1.0f-alpha);
 	}
+	unsigned int r = floorf(fr);
+	unsigned int g = floorf(fg);
+	unsigned int b = floorf(fb);
 
 	return r << 16 | g << 8 | b;
 }