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Code refactor: Split __VOLUME__ defines in Cycles.

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* __VOLUME__ is basic volume support with Emission and Absorption.
* __VOLUME_SCATTER__ enables volume Scattering support.
* __VOLUME_DECOUPLED__ enables Decoupled Ray Marching.
This commit is contained in:
Thomas Dinges
2014-08-20 23:15:30 +02:00
parent 075f6eff74
commit 187d77612b
4 changed files with 29 additions and 6 deletions
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20
intern/cycles/kernel/kernel_path.h
View File

@@ -90,6 +90,8 @@ ccl_device void kernel_path_indirect(KernelGlobals *kg, RNG *rng, Ray ray,
bool heterogeneous = volume_stack_is_heterogeneous(kg, state.volume_stack);
int sampling_method = volume_stack_sampling_method(kg, state.volume_stack);
#ifdef __VOLUME_DECOUPLED__
bool decoupled = kernel_volume_use_decoupled(kg, heterogeneous, false, sampling_method);
if(decoupled) {
@@ -141,12 +143,15 @@ ccl_device void kernel_path_indirect(KernelGlobals *kg, RNG *rng, Ray ray,
break;
}
}
else {
else
#endif
{
/* integrate along volume segment with distance sampling */
ShaderData volume_sd;
VolumeIntegrateResult result = kernel_volume_integrate(
kg, &state, &volume_sd, &volume_ray, L, &throughput, rng);
#ifdef __VOLUME_SCATTER__
if(result == VOLUME_PATH_SCATTERED) {
/* direct lighting */
kernel_path_volume_connect_light(kg, rng, &volume_sd, throughput, &state, L, 1.0f);
@@ -157,6 +162,7 @@ ccl_device void kernel_path_indirect(KernelGlobals *kg, RNG *rng, Ray ray,
else
break;
}
#endif
}
}
#endif
@@ -471,6 +477,8 @@ ccl_device float4 kernel_path_integrate(KernelGlobals *kg, RNG *rng, int sample,
bool heterogeneous = volume_stack_is_heterogeneous(kg, state.volume_stack);
int sampling_method = volume_stack_sampling_method(kg, state.volume_stack);
#ifdef __VOLUME_DECOUPLED__
bool decoupled = kernel_volume_use_decoupled(kg, heterogeneous, true, sampling_method);
if(decoupled) {
@@ -522,12 +530,15 @@ ccl_device float4 kernel_path_integrate(KernelGlobals *kg, RNG *rng, int sample,
break;
}
}
else {
else
#endif
{
/* integrate along volume segment with distance sampling */
ShaderData volume_sd;
VolumeIntegrateResult result = kernel_volume_integrate(
kg, &state, &volume_sd, &volume_ray, &L, &throughput, rng);
#ifdef __VOLUME_SCATTER__
if(result == VOLUME_PATH_SCATTERED) {
/* direct lighting */
kernel_path_volume_connect_light(kg, rng, &volume_sd, throughput, &state, &L, 1.0f);
@@ -538,6 +549,7 @@ ccl_device float4 kernel_path_integrate(KernelGlobals *kg, RNG *rng, int sample,
else
break;
}
#endif
}
}
#endif
@@ -804,7 +816,7 @@ ccl_device float4 kernel_branched_path_integrate(KernelGlobals *kg, RNG *rng, in
Ray volume_ray = ray;
volume_ray.t = (hit)? isect.t: FLT_MAX;
#ifdef __KERNEL_CPU__
#ifdef __VOLUME_DECOUPLED__
/* decoupled ray marching only supported on CPU */
bool heterogeneous = volume_stack_is_heterogeneous(kg, state.volume_stack);
@@ -891,6 +903,7 @@ ccl_device float4 kernel_branched_path_integrate(KernelGlobals *kg, RNG *rng, in
VolumeIntegrateResult result = kernel_volume_integrate(
kg, &ps, &volume_sd, &volume_ray, &L, &tp, rng);
#ifdef __VOLUME_SCATTER__
if(result == VOLUME_PATH_SCATTERED) {
/* todo: support equiangular, MIS and all light sampling.
* alternatively get decoupled ray marching working on the GPU */
@@ -905,6 +918,7 @@ ccl_device float4 kernel_branched_path_integrate(KernelGlobals *kg, RNG *rng, in
path_radiance_reset_indirect(&L);
}
}
#endif
}
/* todo: avoid this calculation using decoupled ray marching */

2
intern/cycles/kernel/kernel_path_volume.h
View File

@@ -16,7 +16,7 @@
CCL_NAMESPACE_BEGIN
#ifdef __VOLUME__
#ifdef __VOLUME_SCATTER__
ccl_device void kernel_path_volume_connect_light(KernelGlobals *kg, RNG *rng,
ShaderData *sd, float3 throughput, PathState *state, PathRadiance *L,

3
intern/cycles/kernel/kernel_types.h
View File

@@ -66,6 +66,8 @@ CCL_NAMESPACE_BEGIN
#define __SUBSURFACE__
#define __CMJ__
#define __VOLUME__
#define __VOLUME_DECOUPLED__
#define __VOLUME_SCATTER__
#define __SHADOW_RECORD_ALL__
#endif
@@ -76,6 +78,7 @@ CCL_NAMESPACE_BEGIN
/* Experimental on GPU */
//#define __VOLUME__
//#define __VOLUME_SCATTER__
//#define __SUBSURFACE__
#endif

10
intern/cycles/kernel/kernel_volume.h
View File

@@ -334,6 +334,7 @@ ccl_device VolumeIntegrateResult kernel_volume_integrate_homogeneous(KernelGloba
float t = ray->t;
float3 new_tp;
#ifdef __VOLUME_SCATTER__
/* randomly scatter, and if we do t is shortened */
if(closure_flag & SD_SCATTER) {
/* extinction coefficient */
@@ -387,7 +388,9 @@ ccl_device VolumeIntegrateResult kernel_volume_integrate_homogeneous(KernelGloba
new_tp = *throughput * transmittance / pdf;
}
}
else if(closure_flag & SD_ABSORPTION) {
else
#endif
if(closure_flag & SD_ABSORPTION) {
/* absorption only, no sampling needed */
float3 transmittance = volume_color_transmittance(coeff.sigma_a, t);
new_tp = *throughput * transmittance;
@@ -464,6 +467,7 @@ ccl_device VolumeIntegrateResult kernel_volume_integrate_heterogeneous_distance(
bool scatter = false;
/* distance sampling */
#ifdef __VOLUME_SCATTER__
if((closure_flag & SD_SCATTER) || (has_scatter && (closure_flag & SD_ABSORPTION))) {
has_scatter = true;
@@ -499,7 +503,9 @@ ccl_device VolumeIntegrateResult kernel_volume_integrate_heterogeneous_distance(
xi = 1.0f - (1.0f - xi)/sample_transmittance;
}
}
else if(closure_flag & SD_ABSORPTION) {
else
#endif
if(closure_flag & SD_ABSORPTION) {
/* absorption only, no sampling needed */
float3 sigma_a = coeff.sigma_a;