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Cycles :

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* Use is_zero(a) rather than dot(a, a) == 0, saves some calculations.
This commit is contained in:
Thomas Dinges 2013-05-14 18:31:55 +00:00
parent 6fc51bf20e
commit 1f3bf34ccd
3 changed files with 4 additions and 3 deletions
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3
intern/cycles/bvh/bvh.cpp
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@ -32,6 +32,7 @@
#include "util_progress.h"
#include "util_system.h"
#include "util_types.h"
#include "util_math.h"
CCL_NAMESPACE_BEGIN
@ -251,7 +252,7 @@ void BVH::pack_triangle(int idx, float4 woop[3])
float3 r1 = v1 - v2;
float3 r2 = cross(r0, r1);
if(dot(r0, r0) == 0.0f || dot(r1, r1) == 0.0f || dot(r2, r2) == 0.0f) {
if(is_zero(r0) || is_zero(r1) || is_zero(r2)) {
/* degenerate */
woop[0] = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
woop[1] = make_float4(0.0f, 0.0f, 0.0f, 0.0f);

2
intern/cycles/kernel/kernel_camera.h
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@ -187,7 +187,7 @@ __device void camera_sample_panorama(KernelGlobals *kg, float raster_x, float ra
}
/* indicates ray should not receive any light, outside of the lens */
if(len_squared(ray->D) == 0.0f) {
if(is_zero(ray->D)) {
ray->t = 0.0f;
return;
}

2
intern/cycles/kernel/kernel_light.h
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@ -492,7 +492,7 @@ __device void curve_segment_light_sample(KernelGlobals *kg, int prim, int object
float r2 = P2.w;
float3 tg = (float4_to_float3(P2) - float4_to_float3(P1)) / l;
float3 xc = make_float3(tg.x * tg.z, tg.y * tg.z, -(tg.x * tg.x + tg.y * tg.y));
if (dot(xc, xc) == 0.0f)
if (is_zero(xc))
xc = make_float3(tg.x * tg.y, -(tg.x * tg.x + tg.z * tg.z), tg.z * tg.y);
xc = normalize(xc);
float3 yc = cross(tg, xc);