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Cycles / Branched Path: Some simplifications for main loop.

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The main loop only handles transparent intersections from the camera ray.
Therefore we can simplify some things.

* Avoid PATH_RAY_CAMERA check, this is always true.
* Avoid path_state_next() call, we can just set transparent flag and increase transparent bounces. This way we avoid the function call and some branching.

Also remove debug num_ray_bounces++, this is incorrect here as no indirect bounce happens here.

Should be no functional changes.
This commit is contained in:
Thomas Dinges
2015-06-15 23:50:29 +02:00
parent 888ed6b7f1
commit 53e3e46332
1 changed files with 11 additions and 7 deletions
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18
intern/cycles/kernel/kernel_path_branched.h
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@@ -197,6 +197,10 @@ ccl_device float4 kernel_branched_path_integrate(KernelGlobals *kg, RNG *rng, in
debug_data_init(&debug_data);
#endif
/* Main Loop
* Here we only handle transparency intersections from the camera ray.
* Indirect bounces are handled in kernel_branched_path_surface_indirect_light().
*/
for(;;) {
/* intersect scene */
Intersection isect;
@@ -207,7 +211,7 @@ ccl_device float4 kernel_branched_path_integrate(KernelGlobals *kg, RNG *rng, in
uint lcg_state = 0;
if(kernel_data.bvh.have_curves) {
if((kernel_data.cam.resolution == 1) && (state.flag & PATH_RAY_CAMERA)) {
if(kernel_data.cam.resolution == 1) {
float3 pixdiff = ray.dD.dx + ray.dD.dy;
/*pixdiff = pixdiff - dot(pixdiff, ray.D)*ray.D;*/
difl = kernel_data.curve.minimum_width * len(pixdiff) * 0.5f;
@@ -223,11 +227,8 @@ ccl_device float4 kernel_branched_path_integrate(KernelGlobals *kg, RNG *rng, in
#endif
#ifdef __KERNEL_DEBUG__
if(state.flag & PATH_RAY_CAMERA) {
debug_data.num_bvh_traversal_steps += isect.num_traversal_steps;
debug_data.num_bvh_traversed_instances += isect.num_traversed_instances;
}
debug_data.num_ray_bounces++;
debug_data.num_bvh_traversal_steps += isect.num_traversal_steps;
debug_data.num_bvh_traversed_instances += isect.num_traversed_instances;
#endif
#ifdef __VOLUME__
@@ -464,7 +465,10 @@ ccl_device float4 kernel_branched_path_integrate(KernelGlobals *kg, RNG *rng, in
break;
}
path_state_next(kg, &state, LABEL_TRANSPARENT);
/* Update Path State */
state.flag |= PATH_RAY_TRANSPARENT;
state.transparent_bounce++;
ray.P = ray_offset(sd.P, -sd.Ng);
ray.t -= sd.ray_length; /* clipping works through transparent */