forked from bartvdbraak/blender
659ba012b0
Rather than treating all ray types equally, we now always render 1 glossy bounce and unlimited transmission bounces. This makes it possible to get good looking results with low AO bounces settings, making it useful to speed up interior renders for example. Reviewed By: brecht Differential Revision: https://developer.blender.org/D2818
229 lines
6.9 KiB
C
229 lines
6.9 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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CCL_NAMESPACE_BEGIN
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ccl_device_inline void path_state_init(KernelGlobals *kg,
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ShaderData *stack_sd,
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ccl_addr_space PathState *state,
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uint rng_hash,
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int sample,
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ccl_addr_space Ray *ray)
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{
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state->flag = PATH_RAY_CAMERA|PATH_RAY_MIS_SKIP;
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state->rng_hash = rng_hash;
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state->rng_offset = PRNG_BASE_NUM;
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state->sample = sample;
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state->num_samples = kernel_data.integrator.aa_samples;
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state->bounce = 0;
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state->diffuse_bounce = 0;
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state->glossy_bounce = 0;
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state->transmission_bounce = 0;
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state->transparent_bounce = 0;
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#ifdef __DENOISING_FEATURES__
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if(kernel_data.film.pass_denoising_data) {
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state->flag |= PATH_RAY_STORE_SHADOW_INFO;
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state->denoising_feature_weight = 1.0f;
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}
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else {
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state->denoising_feature_weight = 0.0f;
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}
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#endif /* __DENOISING_FEATURES__ */
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state->min_ray_pdf = FLT_MAX;
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state->ray_pdf = 0.0f;
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#ifdef __LAMP_MIS__
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state->ray_t = 0.0f;
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#endif
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#ifdef __VOLUME__
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state->volume_bounce = 0;
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if(kernel_data.integrator.use_volumes) {
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/* Initialize volume stack with volume we are inside of. */
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kernel_volume_stack_init(kg, stack_sd, state, ray, state->volume_stack);
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/* Seed RNG for cases where we can't use stratified samples .*/
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state->rng_congruential = lcg_init(rng_hash + sample*0x51633e2d);
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}
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else {
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state->volume_stack[0].shader = SHADER_NONE;
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}
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#endif
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}
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ccl_device_inline void path_state_next(KernelGlobals *kg, ccl_addr_space PathState *state, int label)
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{
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/* ray through transparent keeps same flags from previous ray and is
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* not counted as a regular bounce, transparent has separate max */
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if(label & LABEL_TRANSPARENT) {
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state->flag |= PATH_RAY_TRANSPARENT;
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state->transparent_bounce++;
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/* don't increase random number generator offset here, to avoid some
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* unwanted patterns, see path_state_rng_1D_for_decision */
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if(!kernel_data.integrator.transparent_shadows)
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state->flag |= PATH_RAY_MIS_SKIP;
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return;
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}
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state->bounce++;
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#ifdef __VOLUME__
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if(label & LABEL_VOLUME_SCATTER) {
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/* volume scatter */
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state->flag |= PATH_RAY_VOLUME_SCATTER;
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state->flag &= ~(PATH_RAY_REFLECT|PATH_RAY_TRANSMIT|PATH_RAY_CAMERA|PATH_RAY_TRANSPARENT|PATH_RAY_DIFFUSE|PATH_RAY_GLOSSY|PATH_RAY_SINGULAR|PATH_RAY_MIS_SKIP);
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state->volume_bounce++;
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}
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else
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#endif
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{
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/* surface reflection/transmission */
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if(label & LABEL_REFLECT) {
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state->flag |= PATH_RAY_REFLECT;
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state->flag &= ~(PATH_RAY_TRANSMIT|PATH_RAY_VOLUME_SCATTER|PATH_RAY_CAMERA|PATH_RAY_TRANSPARENT);
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if(label & LABEL_DIFFUSE)
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state->diffuse_bounce++;
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else
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state->glossy_bounce++;
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}
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else {
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kernel_assert(label & LABEL_TRANSMIT);
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state->flag |= PATH_RAY_TRANSMIT;
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state->flag &= ~(PATH_RAY_REFLECT|PATH_RAY_VOLUME_SCATTER|PATH_RAY_CAMERA|PATH_RAY_TRANSPARENT);
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state->transmission_bounce++;
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}
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/* diffuse/glossy/singular */
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if(label & LABEL_DIFFUSE) {
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state->flag |= PATH_RAY_DIFFUSE|PATH_RAY_DIFFUSE_ANCESTOR;
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state->flag &= ~(PATH_RAY_GLOSSY|PATH_RAY_SINGULAR|PATH_RAY_MIS_SKIP);
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}
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else if(label & LABEL_GLOSSY) {
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state->flag |= PATH_RAY_GLOSSY;
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state->flag &= ~(PATH_RAY_DIFFUSE|PATH_RAY_SINGULAR|PATH_RAY_MIS_SKIP);
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}
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else {
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kernel_assert(label & LABEL_SINGULAR);
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state->flag |= PATH_RAY_GLOSSY|PATH_RAY_SINGULAR|PATH_RAY_MIS_SKIP;
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state->flag &= ~PATH_RAY_DIFFUSE;
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}
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}
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/* random number generator next bounce */
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state->rng_offset += PRNG_BOUNCE_NUM;
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#ifdef __DENOISING_FEATURES__
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if((state->denoising_feature_weight == 0.0f) && !(state->flag & PATH_RAY_SHADOW_CATCHER)) {
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state->flag &= ~PATH_RAY_STORE_SHADOW_INFO;
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}
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#endif
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}
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ccl_device_inline uint path_state_ray_visibility(KernelGlobals *kg, ccl_addr_space PathState *state)
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{
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uint flag = state->flag & PATH_RAY_ALL_VISIBILITY;
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/* for visibility, diffuse/glossy are for reflection only */
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if(flag & PATH_RAY_TRANSMIT)
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flag &= ~(PATH_RAY_DIFFUSE|PATH_RAY_GLOSSY);
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/* todo: this is not supported as its own ray visibility yet */
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if(state->flag & PATH_RAY_VOLUME_SCATTER)
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flag |= PATH_RAY_DIFFUSE;
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return flag;
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}
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ccl_device_inline float path_state_continuation_probability(KernelGlobals *kg, ccl_addr_space PathState *state, const float3 throughput)
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{
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if(state->flag & PATH_RAY_TRANSPARENT) {
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/* Transparent rays are treated separately with own max bounces. */
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if(state->transparent_bounce >= kernel_data.integrator.transparent_max_bounce) {
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return 0.0f;
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}
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/* Do at least one bounce without RR. */
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else if(state->transparent_bounce <= 1) {
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return 1.0f;
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}
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#ifdef __SHADOW_TRICKS__
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/* Exception for shadow catcher not working correctly with RR. */
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else if((state->flag & PATH_RAY_SHADOW_CATCHER) && (state->transparent_bounce <= 8)) {
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return 1.0f;
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}
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#endif
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}
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else {
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/* Test max bounces for various ray types. */
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if((state->bounce >= kernel_data.integrator.max_bounce) ||
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(state->diffuse_bounce >= kernel_data.integrator.max_diffuse_bounce) ||
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(state->glossy_bounce >= kernel_data.integrator.max_glossy_bounce) ||
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#ifdef __VOLUME__
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(state->volume_bounce >= kernel_data.integrator.max_volume_bounce) ||
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#endif
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(state->transmission_bounce >= kernel_data.integrator.max_transmission_bounce))
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{
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return 0.0f;
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}
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/* Do at least one bounce without RR. */
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else if(state->bounce <= 1) {
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return 1.0f;
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}
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#ifdef __SHADOW_TRICKS__
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/* Exception for shadow catcher not working correctly with RR. */
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else if((state->flag & PATH_RAY_SHADOW_CATCHER) && (state->bounce <= 3)) {
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return 1.0f;
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}
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#endif
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}
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/* Probalistic termination: use sqrt() to roughly match typical view
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* transform and do path termination a bit later on average. */
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return min(sqrtf(max3(fabs(throughput))), 1.0f);
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}
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/* TODO(DingTo): Find more meaningful name for this */
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ccl_device_inline void path_state_modify_bounce(ccl_addr_space PathState *state, bool increase)
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{
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/* Modify bounce temporarily for shader eval */
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if(increase)
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state->bounce += 1;
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else
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state->bounce -= 1;
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}
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ccl_device_inline bool path_state_ao_bounce(KernelGlobals *kg, ccl_addr_space PathState *state)
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{
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if(state->bounce <= kernel_data.integrator.ao_bounces) {
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return false;
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}
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int bounce = state->bounce - state->transmission_bounce - (state->glossy_bounce > 0);
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return (bounce > kernel_data.integrator.ao_bounces);
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}
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CCL_NAMESPACE_END
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