Differential D13093 Diff 44435 intern/cycles/kernel/integrator/intersect_volume_stack.h

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intern/cycles/kernel/integrator/intersect_volume_stack.h

Show All 36 Lines	ccl_device void integrator_volume_stack_update_for_subsurface(KernelGlobals kg,

Ray volume_ray ccl_optional_struct_init;		Ray volume_ray ccl_optional_struct_init;
volume_ray.P = from_P;		volume_ray.P = from_P;
volume_ray.D = normalize_len(to_P - from_P, &volume_ray.t);		volume_ray.D = normalize_len(to_P - from_P, &volume_ray.t);

/* Store to avoid global fetches on every intersection step. */		/* Store to avoid global fetches on every intersection step. */
const uint volume_stack_size = kernel_data.volume_stack_size;		const uint volume_stack_size = kernel_data.volume_stack_size;

		const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag);
		const uint32_t visibility = SHADOW_CATCHER_PATH_VISIBILITY(path_flag, PATH_RAY_ALL_VISIBILITY);

#ifdef __VOLUME_RECORD_ALL__		#ifdef __VOLUME_RECORD_ALL__
Intersection hits[2 * MAX_VOLUME_STACK_SIZE + 1];		Intersection hits[2 * MAX_VOLUME_STACK_SIZE + 1];
uint num_hits = scene_intersect_volume_all(		uint num_hits = scene_intersect_volume_all(
kg, &volume_ray, hits, 2 * volume_stack_size, PATH_RAY_ALL_VISIBILITY);		kg, &volume_ray, hits, 2 * volume_stack_size, visibility);
if (num_hits > 0) {		if (num_hits > 0) {
Intersection *isect = hits;		Intersection *isect = hits;

qsort(hits, num_hits, sizeof(Intersection), intersections_compare);		qsort(hits, num_hits, sizeof(Intersection), intersections_compare);

for (uint hit = 0; hit < num_hits; ++hit, ++isect) {		for (uint hit = 0; hit < num_hits; ++hit, ++isect) {
shader_setup_from_ray(kg, stack_sd, &volume_ray, isect);		shader_setup_from_ray(kg, stack_sd, &volume_ray, isect);
volume_stack_enter_exit(kg, state, stack_sd);		volume_stack_enter_exit(kg, state, stack_sd);
}		}
}		}
#else		#else
Intersection isect;		Intersection isect;
int step = 0;		int step = 0;
while (step < 2 * volume_stack_size &&		while (step < 2 * volume_stack_size &&
scene_intersect_volume(kg, &volume_ray, &isect, PATH_RAY_ALL_VISIBILITY)) {		scene_intersect_volume(kg, &volume_ray, &isect, visibility)) {
shader_setup_from_ray(kg, stack_sd, &volume_ray, &isect);		shader_setup_from_ray(kg, stack_sd, &volume_ray, &isect);
volume_stack_enter_exit(kg, state, stack_sd);		volume_stack_enter_exit(kg, state, stack_sd);

/* Move ray forward. */		/* Move ray forward. */
volume_ray.P = ray_offset(stack_sd->P, -stack_sd->Ng);		volume_ray.P = ray_offset(stack_sd->P, -stack_sd->Ng);
if (volume_ray.t != FLT_MAX) {		if (volume_ray.t != FLT_MAX) {
volume_ray.D = normalize_len(to_P - volume_ray.P, &volume_ray.t);		volume_ray.D = normalize_len(to_P - volume_ray.P, &volume_ray.t);
}		}
++step;		++step;
}		}
#endif		#endif
}		}

ccl_device void integrator_intersect_volume_stack(KernelGlobals kg, IntegratorState state)		ccl_device void integrator_volume_stack_init(KernelGlobals kg, IntegratorState state)
{		{
PROFILING_INIT(kg, PROFILING_INTERSECT_VOLUME_STACK);		PROFILING_INIT(kg, PROFILING_INTERSECT_VOLUME_STACK);

ShaderDataTinyStorage stack_sd_storage;		ShaderDataTinyStorage stack_sd_storage;
ccl_private ShaderData *stack_sd = AS_SHADER_DATA(&stack_sd_storage);		ccl_private ShaderData *stack_sd = AS_SHADER_DATA(&stack_sd_storage);

Ray volume_ray ccl_optional_struct_init;		Ray volume_ray ccl_optional_struct_init;
integrator_state_read_ray(kg, state, &volume_ray);		integrator_state_read_ray(kg, state, &volume_ray);

/* Trace ray in random direction. Any direction works, Z up is a guess to get the		/* Trace ray in random direction. Any direction works, Z up is a guess to get the
* fewest hits. */		* fewest hits. */
volume_ray.D = make_float3(0.0f, 0.0f, 1.0f);		volume_ray.D = make_float3(0.0f, 0.0f, 1.0f);
volume_ray.t = FLT_MAX;		volume_ray.t = FLT_MAX;

const uint visibility = (INTEGRATOR_STATE(state, path, flag) & PATH_RAY_ALL_VISIBILITY);
int stack_index = 0, enclosed_index = 0;		int stack_index = 0, enclosed_index = 0;

/* Write background shader. */		const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag);
		const uint32_t visibility = SHADOW_CATCHER_PATH_VISIBILITY(path_flag, PATH_RAY_CAMERA);

		/* Initialize volume stack with background volume For shadow catcher the
		* background volume is always assumed to be CG. */
if (kernel_data.background.volume_shader != SHADER_NONE) {		if (kernel_data.background.volume_shader != SHADER_NONE) {
const VolumeStack new_entry = {OBJECT_NONE, kernel_data.background.volume_shader};		if (!(path_flag & PATH_RAY_SHADOW_CATCHER_PASS)) {
integrator_state_write_volume_stack(state, stack_index, new_entry);		INTEGRATOR_STATE_ARRAY_WRITE(state, volume_stack, stack_index, object) = OBJECT_NONE;
		INTEGRATOR_STATE_ARRAY_WRITE(
		state, volume_stack, stack_index, shader) = kernel_data.background.volume_shader;
stack_index++;		stack_index++;
}		}
		}

/* Store to avoid global fetches on every intersection step. */		/* Store to avoid global fetches on every intersection step. */
const uint volume_stack_size = kernel_data.volume_stack_size;		const uint volume_stack_size = kernel_data.volume_stack_size;

#ifdef __VOLUME_RECORD_ALL__		#ifdef __VOLUME_RECORD_ALL__
Intersection hits[2 * MAX_VOLUME_STACK_SIZE + 1];		Intersection hits[2 * MAX_VOLUME_STACK_SIZE + 1];
uint num_hits = scene_intersect_volume_all(		uint num_hits = scene_intersect_volume_all(
kg, &volume_ray, hits, 2 * volume_stack_size, visibility);		kg, &volume_ray, hits, 2 * volume_stack_size, visibility);
▲ Show 20 Lines • Show All 88 Lines • ▼ Show 20 Lines	while (stack_index < volume_stack_size - 1 && enclosed_index < MAX_VOLUME_STACK_SIZE - 1 &&
volume_ray.P = ray_offset(stack_sd->P, -stack_sd->Ng);		volume_ray.P = ray_offset(stack_sd->P, -stack_sd->Ng);
++step;		++step;
}		}
#endif		#endif

/* Write terminator. */		/* Write terminator. */
const VolumeStack new_entry = {OBJECT_NONE, SHADER_NONE};		const VolumeStack new_entry = {OBJECT_NONE, SHADER_NONE};
integrator_state_write_volume_stack(state, stack_index, new_entry);		integrator_state_write_volume_stack(state, stack_index, new_entry);
		}

		ccl_device void integrator_intersect_volume_stack(KernelGlobals kg, IntegratorState state)
		{
		integrator_volume_stack_init(kg, state);

		if (INTEGRATOR_STATE(state, path, flag) & PATH_RAY_SHADOW_CATCHER_PASS) {
		/* Volume stack re-init for shadow catcher, continue with shading of hit. */
		integrator_intersect_next_kernel_after_shadow_catcher_volume<
		DEVICE_KERNEL_INTEGRATOR_INTERSECT_VOLUME_STACK>(kg, state);
		}
		else {
		/* Volume stack init for camera rays, continue with intersection of camera ray. */
INTEGRATOR_PATH_NEXT(DEVICE_KERNEL_INTEGRATOR_INTERSECT_VOLUME_STACK,		INTEGRATOR_PATH_NEXT(DEVICE_KERNEL_INTEGRATOR_INTERSECT_VOLUME_STACK,
DEVICE_KERNEL_INTEGRATOR_INTERSECT_CLOSEST);		DEVICE_KERNEL_INTEGRATOR_INTERSECT_CLOSEST);
}		}
		}

CCL_NAMESPACE_END		CCL_NAMESPACE_END