forked from bartvdbraak/blender
58a290234b
multiple importance sampling, so you can disable them for diffuse/glossy/transmission. The Light Path node here is still weak and does not give this info. To make that work we'd need to evaluate the shader multiple times which is slow and we can't detect well enough when it is actually needed.
653 lines
19 KiB
C++
653 lines
19 KiB
C++
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "device.h"
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#include "integrator.h"
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#include "film.h"
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#include "light.h"
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#include "mesh.h"
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#include "object.h"
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#include "scene.h"
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#include "shader.h"
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#include "util_foreach.h"
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#include "util_progress.h"
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CCL_NAMESPACE_BEGIN
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static void dump_background_pixels(Device *device, DeviceScene *dscene, int res, vector<float3>& pixels)
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{
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/* create input */
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int width = res;
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int height = res;
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device_vector<uint4> d_input;
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device_vector<float4> d_output;
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uint4 *d_input_data = d_input.resize(width*height);
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for(int y = 0; y < height; y++) {
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for(int x = 0; x < width; x++) {
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float u = x/(float)width;
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float v = y/(float)height;
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uint4 in = make_uint4(__float_as_int(u), __float_as_int(v), 0, 0);
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d_input_data[x + y*width] = in;
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}
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}
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/* compute on device */
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float4 *d_output_data = d_output.resize(width*height);
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memset((void*)d_output.data_pointer, 0, d_output.memory_size());
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device->const_copy_to("__data", &dscene->data, sizeof(dscene->data));
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device->mem_alloc(d_input, MEM_READ_ONLY);
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device->mem_copy_to(d_input);
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device->mem_alloc(d_output, MEM_WRITE_ONLY);
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DeviceTask main_task(DeviceTask::SHADER);
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main_task.shader_input = d_input.device_pointer;
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main_task.shader_output = d_output.device_pointer;
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main_task.shader_eval_type = SHADER_EVAL_BACKGROUND;
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main_task.shader_x = 0;
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main_task.shader_w = width*height;
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/* disabled splitting for now, there's an issue with multi-GPU mem_copy_from */
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list<DeviceTask> split_tasks;
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main_task.split_max_size(split_tasks, 128*128);
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foreach(DeviceTask& task, split_tasks) {
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device->task_add(task);
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device->task_wait();
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device->mem_copy_from(d_output, task.shader_x, 1, task.shader_w, sizeof(float4));
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}
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device->mem_free(d_input);
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device->mem_free(d_output);
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d_output_data = reinterpret_cast<float4*>(d_output.data_pointer);
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pixels.resize(width*height);
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for(int y = 0; y < height; y++) {
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for(int x = 0; x < width; x++) {
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pixels[y*width + x].x = d_output_data[y*width + x].x;
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pixels[y*width + x].y = d_output_data[y*width + x].y;
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pixels[y*width + x].z = d_output_data[y*width + x].z;
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}
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}
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}
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/* Light */
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Light::Light()
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{
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type = LIGHT_POINT;
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co = make_float3(0.0f, 0.0f, 0.0f);
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dir = make_float3(0.0f, 0.0f, 0.0f);
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size = 0.0f;
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axisu = make_float3(0.0f, 0.0f, 0.0f);
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sizeu = 1.0f;
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axisv = make_float3(0.0f, 0.0f, 0.0f);
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sizev = 1.0f;
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map_resolution = 512;
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spot_angle = M_PI_4_F;
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spot_smooth = 0.0f;
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cast_shadow = true;
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use_mis = false;
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use_diffuse = true;
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use_glossy = true;
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use_transmission = true;
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shader = 0;
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samples = 1;
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}
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void Light::tag_update(Scene *scene)
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{
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scene->light_manager->need_update = true;
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}
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/* Light Manager */
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LightManager::LightManager()
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{
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need_update = true;
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}
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LightManager::~LightManager()
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{
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}
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void LightManager::device_update_distribution(Device *device, DeviceScene *dscene, Scene *scene, Progress& progress)
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{
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progress.set_status("Updating Lights", "Computing distribution");
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/* count */
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size_t num_lights = scene->lights.size();
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size_t num_background_lights = 0;
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size_t num_triangles = 0;
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size_t num_curve_segments = 0;
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foreach(Object *object, scene->objects) {
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Mesh *mesh = object->mesh;
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bool have_emission = false;
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/* skip if we are not visible for BSDFs */
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if(!(object->visibility & (PATH_RAY_DIFFUSE|PATH_RAY_GLOSSY|PATH_RAY_TRANSMIT)))
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continue;
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/* skip if we have no emission shaders */
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foreach(uint sindex, mesh->used_shaders) {
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Shader *shader = scene->shaders[sindex];
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if(shader->sample_as_light && shader->has_surface_emission) {
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have_emission = true;
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break;
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}
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}
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/* count triangles */
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if(have_emission) {
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for(size_t i = 0; i < mesh->triangles.size(); i++) {
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Shader *shader = scene->shaders[mesh->shader[i]];
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if(shader->sample_as_light && shader->has_surface_emission)
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num_triangles++;
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}
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/* disabled for curves */
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#if 0
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foreach(Mesh::Curve& curve, mesh->curves) {
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Shader *shader = scene->shaders[curve.shader];
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if(shader->sample_as_light && shader->has_surface_emission)
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num_curve_segments += curve.num_segments();
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#endif
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}
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}
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size_t num_distribution = num_triangles + num_curve_segments;
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num_distribution += num_lights;
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/* emission area */
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float4 *distribution = dscene->light_distribution.resize(num_distribution + 1);
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float totarea = 0.0f;
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/* triangles */
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size_t offset = 0;
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int j = 0;
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foreach(Object *object, scene->objects) {
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Mesh *mesh = object->mesh;
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bool have_emission = false;
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/* skip if we are not visible for BSDFs */
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if(!(object->visibility & (PATH_RAY_DIFFUSE|PATH_RAY_GLOSSY|PATH_RAY_TRANSMIT))) {
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j++;
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continue;
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}
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/* skip if we have no emission shaders */
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foreach(uint sindex, mesh->used_shaders) {
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Shader *shader = scene->shaders[sindex];
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if(shader->sample_as_light && shader->has_surface_emission) {
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have_emission = true;
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break;
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}
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}
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/* sum area */
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if(have_emission) {
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bool transform_applied = mesh->transform_applied;
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Transform tfm = object->tfm;
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int object_id = j;
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int shader_id = SHADER_MASK;
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if(transform_applied)
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object_id = ~object_id;
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if(!(object->visibility & PATH_RAY_DIFFUSE)) {
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shader_id |= SHADER_EXCLUDE_DIFFUSE;
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scene->film->use_light_visibility = true;
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}
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if(!(object->visibility & PATH_RAY_GLOSSY)) {
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shader_id |= SHADER_EXCLUDE_GLOSSY;
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scene->film->use_light_visibility = true;
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}
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if(!(object->visibility & PATH_RAY_TRANSMIT)) {
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shader_id |= SHADER_EXCLUDE_TRANSMIT;
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scene->film->use_light_visibility = true;
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}
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for(size_t i = 0; i < mesh->triangles.size(); i++) {
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Shader *shader = scene->shaders[mesh->shader[i]];
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if(shader->sample_as_light && shader->has_surface_emission) {
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distribution[offset].x = totarea;
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distribution[offset].y = __int_as_float(i + mesh->tri_offset);
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distribution[offset].z = __int_as_float(shader_id);
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distribution[offset].w = __int_as_float(object_id);
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offset++;
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Mesh::Triangle t = mesh->triangles[i];
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float3 p1 = mesh->verts[t.v[0]];
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float3 p2 = mesh->verts[t.v[1]];
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float3 p3 = mesh->verts[t.v[2]];
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if(!transform_applied) {
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p1 = transform_point(&tfm, p1);
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p2 = transform_point(&tfm, p2);
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p3 = transform_point(&tfm, p3);
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}
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totarea += triangle_area(p1, p2, p3);
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}
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}
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/* sample as light disabled for strands */
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#if 0
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size_t i = 0;
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foreach(Mesh::Curve& curve, mesh->curves) {
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Shader *shader = scene->shaders[curve.shader];
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int first_key = curve.first_key;
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if(shader->sample_as_light && shader->has_surface_emission) {
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for(int j = 0; j < curve.num_segments(); j++) {
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distribution[offset].x = totarea;
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distribution[offset].y = __int_as_float(i + mesh->curve_offset); // XXX fix kernel code
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distribution[offset].z = __int_as_float(j) & SHADER_MASK;
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distribution[offset].w = __int_as_float(object_id);
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offset++;
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float3 p1 = mesh->curve_keys[first_key + j].loc;
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float r1 = mesh->curve_keys[first_key + j].radius;
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float3 p2 = mesh->curve_keys[first_key + j + 1].loc;
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float r2 = mesh->curve_keys[first_key + j + 1].radius;
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if(!transform_applied) {
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p1 = transform_point(&tfm, p1);
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p2 = transform_point(&tfm, p2);
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}
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totarea += M_PI_F * (r1 + r2) * len(p1 - p2);
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}
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}
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i++;
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}
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#endif
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}
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if(progress.get_cancel()) return;
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j++;
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}
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float trianglearea = totarea;
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/* point lights */
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float lightarea = (totarea > 0.0f)? totarea/scene->lights.size(): 1.0f;
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bool use_lamp_mis = false;
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for(int i = 0; i < scene->lights.size(); i++, offset++) {
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Light *light = scene->lights[i];
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distribution[offset].x = totarea;
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distribution[offset].y = __int_as_float(~(int)i);
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distribution[offset].z = 1.0f;
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distribution[offset].w = light->size;
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totarea += lightarea;
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if(light->size > 0.0f && light->use_mis)
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use_lamp_mis = true;
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if(light->type == LIGHT_BACKGROUND)
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num_background_lights++;
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}
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/* normalize cumulative distribution functions */
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distribution[num_distribution].x = totarea;
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distribution[num_distribution].y = 0.0f;
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distribution[num_distribution].z = 0.0f;
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distribution[num_distribution].w = 0.0f;
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if(totarea > 0.0f) {
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for(size_t i = 0; i < num_distribution; i++)
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distribution[i].x /= totarea;
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distribution[num_distribution].x = 1.0f;
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}
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if(progress.get_cancel()) return;
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/* update device */
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KernelIntegrator *kintegrator = &dscene->data.integrator;
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KernelFilm *kfilm = &dscene->data.film;
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kintegrator->use_direct_light = (totarea > 0.0f);
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if(kintegrator->use_direct_light) {
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/* number of emissives */
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kintegrator->num_distribution = num_distribution;
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/* precompute pdfs */
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kintegrator->pdf_triangles = 0.0f;
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kintegrator->pdf_lights = 0.0f;
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kintegrator->inv_pdf_lights = 0.0f;
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/* sample one, with 0.5 probability of light or triangle */
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kintegrator->num_all_lights = num_lights;
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if(trianglearea > 0.0f) {
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kintegrator->pdf_triangles = 1.0f/trianglearea;
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if(num_lights)
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kintegrator->pdf_triangles *= 0.5f;
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}
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if(num_lights) {
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kintegrator->pdf_lights = 1.0f/num_lights;
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if(trianglearea > 0.0f)
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kintegrator->pdf_lights *= 0.5f;
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kintegrator->inv_pdf_lights = 1.0f/kintegrator->pdf_lights;
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}
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kintegrator->use_lamp_mis = use_lamp_mis;
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/* bit of an ugly hack to compensate for emitting triangles influencing
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* amount of samples we get for this pass */
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kfilm->pass_shadow_scale = 1.0f;
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if(kintegrator->pdf_triangles != 0.0f)
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kfilm->pass_shadow_scale *= 0.5f;
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if(num_background_lights < num_lights)
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kfilm->pass_shadow_scale *= (float)(num_lights - num_background_lights)/(float)num_lights;
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/* CDF */
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device->tex_alloc("__light_distribution", dscene->light_distribution);
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}
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else {
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dscene->light_distribution.clear();
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kintegrator->num_distribution = 0;
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kintegrator->num_all_lights = 0;
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kintegrator->pdf_triangles = 0.0f;
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kintegrator->pdf_lights = 0.0f;
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kintegrator->inv_pdf_lights = 0.0f;
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kintegrator->use_lamp_mis = false;
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kfilm->pass_shadow_scale = 1.0f;
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}
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}
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void LightManager::device_update_background(Device *device, DeviceScene *dscene, Scene *scene, Progress& progress)
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{
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KernelIntegrator *kintegrator = &dscene->data.integrator;
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Light *background_light = NULL;
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/* find background light */
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foreach(Light *light, scene->lights) {
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if(light->type == LIGHT_BACKGROUND) {
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background_light = light;
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break;
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}
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}
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/* no background light found, signal renderer to skip sampling */
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if(!background_light) {
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kintegrator->pdf_background_res = 0;
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return;
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}
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progress.set_status("Updating Lights", "Importance map");
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assert(kintegrator->use_direct_light);
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/* get the resolution from the light's size (we stuff it in there) */
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int res = background_light->map_resolution;
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kintegrator->pdf_background_res = res;
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assert(res > 0);
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vector<float3> pixels;
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dump_background_pixels(device, dscene, res, pixels);
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if(progress.get_cancel())
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return;
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/* build row distributions and column distribution for the infinite area environment light */
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int cdf_count = res + 1;
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float2 *marg_cdf = dscene->light_background_marginal_cdf.resize(cdf_count);
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float2 *cond_cdf = dscene->light_background_conditional_cdf.resize(cdf_count * cdf_count);
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/* conditional CDFs (rows, U direction) */
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for(int i = 0; i < res; i++) {
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float sin_theta = sinf(M_PI_F * (i + 0.5f) / res);
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float3 env_color = pixels[i * res];
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float ave_luminamce = average(env_color);
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cond_cdf[i * cdf_count].x = ave_luminamce * sin_theta;
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cond_cdf[i * cdf_count].y = 0.0f;
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for(int j = 1; j < res; j++) {
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env_color = pixels[i * res + j];
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ave_luminamce = average(env_color);
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cond_cdf[i * cdf_count + j].x = ave_luminamce * sin_theta;
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cond_cdf[i * cdf_count + j].y = cond_cdf[i * cdf_count + j - 1].y + cond_cdf[i * cdf_count + j - 1].x / res;
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}
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float cdf_total = cond_cdf[i * cdf_count + res - 1].y + cond_cdf[i * cdf_count + res - 1].x / res;
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/* stuff the total into the brightness value for the last entry, because
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* we are going to normalize the CDFs to 0.0 to 1.0 afterwards */
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cond_cdf[i * cdf_count + res].x = cdf_total;
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if(cdf_total > 0.0f)
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for(int j = 1; j < res; j++)
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cond_cdf[i * cdf_count + j].y /= cdf_total;
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cond_cdf[i * cdf_count + res].y = 1.0f;
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}
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/* marginal CDFs (column, V direction, sum of rows) */
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marg_cdf[0].x = cond_cdf[res].x;
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marg_cdf[0].y = 0.0f;
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for(int i = 1; i < res; i++) {
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marg_cdf[i].x = cond_cdf[i * cdf_count + res].x;
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marg_cdf[i].y = marg_cdf[i - 1].y + marg_cdf[i - 1].x / res;
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}
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float cdf_total = marg_cdf[res - 1].y + marg_cdf[res - 1].x / res;
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marg_cdf[res].x = cdf_total;
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if(cdf_total > 0.0f)
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for(int i = 1; i < res; i++)
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marg_cdf[i].y /= cdf_total;
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marg_cdf[res].y = 1.0f;
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/* update device */
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device->tex_alloc("__light_background_marginal_cdf", dscene->light_background_marginal_cdf);
|
|
device->tex_alloc("__light_background_conditional_cdf", dscene->light_background_conditional_cdf);
|
|
}
|
|
|
|
void LightManager::device_update_points(Device *device, DeviceScene *dscene, Scene *scene)
|
|
{
|
|
if(scene->lights.size() == 0)
|
|
return;
|
|
|
|
float4 *light_data = dscene->light_data.resize(scene->lights.size()*LIGHT_SIZE);
|
|
|
|
if(!device->info.advanced_shading) {
|
|
/* remove unsupported light */
|
|
foreach(Light *light, scene->lights) {
|
|
if(light->type == LIGHT_BACKGROUND) {
|
|
scene->lights.erase(std::remove(scene->lights.begin(), scene->lights.end(), light), scene->lights.end());
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
scene->film->use_light_visibility = false;
|
|
|
|
for(size_t i = 0; i < scene->lights.size(); i++) {
|
|
Light *light = scene->lights[i];
|
|
float3 co = light->co;
|
|
float3 dir = normalize(light->dir);
|
|
int shader_id = scene->shader_manager->get_shader_id(scene->lights[i]->shader);
|
|
float samples = __int_as_float(light->samples);
|
|
|
|
if(!light->cast_shadow)
|
|
shader_id &= ~SHADER_CAST_SHADOW;
|
|
|
|
if(!light->use_diffuse) {
|
|
shader_id |= SHADER_EXCLUDE_DIFFUSE;
|
|
scene->film->use_light_visibility = true;
|
|
}
|
|
if(!light->use_glossy) {
|
|
shader_id |= SHADER_EXCLUDE_GLOSSY;
|
|
scene->film->use_light_visibility = true;
|
|
}
|
|
if(!light->use_transmission) {
|
|
shader_id |= SHADER_EXCLUDE_TRANSMIT;
|
|
scene->film->use_light_visibility = true;
|
|
}
|
|
|
|
if(light->type == LIGHT_POINT) {
|
|
shader_id &= ~SHADER_AREA_LIGHT;
|
|
|
|
float radius = light->size;
|
|
float invarea = (radius > 0.0f)? 1.0f/(M_PI_F*radius*radius): 1.0f;
|
|
|
|
if(light->use_mis && radius > 0.0f)
|
|
shader_id |= SHADER_USE_MIS;
|
|
|
|
light_data[i*LIGHT_SIZE + 0] = make_float4(__int_as_float(light->type), co.x, co.y, co.z);
|
|
light_data[i*LIGHT_SIZE + 1] = make_float4(__int_as_float(shader_id), radius, invarea, 0.0f);
|
|
light_data[i*LIGHT_SIZE + 2] = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
light_data[i*LIGHT_SIZE + 3] = make_float4(samples, 0.0f, 0.0f, 0.0f);
|
|
}
|
|
else if(light->type == LIGHT_DISTANT) {
|
|
shader_id &= ~SHADER_AREA_LIGHT;
|
|
|
|
float radius = light->size;
|
|
float angle = atanf(radius);
|
|
float cosangle = cosf(angle);
|
|
float area = M_PI_F*radius*radius;
|
|
float invarea = (area > 0.0f)? 1.0f/area: 1.0f;
|
|
|
|
if(light->use_mis && area > 0.0f)
|
|
shader_id |= SHADER_USE_MIS;
|
|
|
|
light_data[i*LIGHT_SIZE + 0] = make_float4(__int_as_float(light->type), dir.x, dir.y, dir.z);
|
|
light_data[i*LIGHT_SIZE + 1] = make_float4(__int_as_float(shader_id), radius, cosangle, invarea);
|
|
light_data[i*LIGHT_SIZE + 2] = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
light_data[i*LIGHT_SIZE + 3] = make_float4(samples, 0.0f, 0.0f, 0.0f);
|
|
}
|
|
else if(light->type == LIGHT_BACKGROUND) {
|
|
shader_id &= ~SHADER_AREA_LIGHT;
|
|
shader_id |= SHADER_USE_MIS;
|
|
|
|
light_data[i*LIGHT_SIZE + 0] = make_float4(__int_as_float(light->type), 0.0f, 0.0f, 0.0f);
|
|
light_data[i*LIGHT_SIZE + 1] = make_float4(__int_as_float(shader_id), 0.0f, 0.0f, 0.0f);
|
|
light_data[i*LIGHT_SIZE + 2] = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
light_data[i*LIGHT_SIZE + 3] = make_float4(samples, 0.0f, 0.0f, 0.0f);
|
|
}
|
|
else if(light->type == LIGHT_AREA) {
|
|
float3 axisu = light->axisu*(light->sizeu*light->size);
|
|
float3 axisv = light->axisv*(light->sizev*light->size);
|
|
float area = len(axisu)*len(axisv);
|
|
float invarea = (area > 0.0f)? 1.0f/area: 1.0f;
|
|
|
|
if(light->use_mis && area > 0.0f)
|
|
shader_id |= SHADER_USE_MIS;
|
|
|
|
light_data[i*LIGHT_SIZE + 0] = make_float4(__int_as_float(light->type), co.x, co.y, co.z);
|
|
light_data[i*LIGHT_SIZE + 1] = make_float4(__int_as_float(shader_id), axisu.x, axisu.y, axisu.z);
|
|
light_data[i*LIGHT_SIZE + 2] = make_float4(invarea, axisv.x, axisv.y, axisv.z);
|
|
light_data[i*LIGHT_SIZE + 3] = make_float4(samples, dir.x, dir.y, dir.z);
|
|
}
|
|
else if(light->type == LIGHT_SPOT) {
|
|
shader_id &= ~SHADER_AREA_LIGHT;
|
|
|
|
float radius = light->size;
|
|
float invarea = (radius > 0.0f)? 1.0f/(M_PI_F*radius*radius): 1.0f;
|
|
float spot_angle = cosf(light->spot_angle*0.5f);
|
|
float spot_smooth = (1.0f - spot_angle)*light->spot_smooth;
|
|
|
|
if(light->use_mis && radius > 0.0f)
|
|
shader_id |= SHADER_USE_MIS;
|
|
|
|
light_data[i*LIGHT_SIZE + 0] = make_float4(__int_as_float(light->type), co.x, co.y, co.z);
|
|
light_data[i*LIGHT_SIZE + 1] = make_float4(__int_as_float(shader_id), radius, invarea, spot_angle);
|
|
light_data[i*LIGHT_SIZE + 2] = make_float4(spot_smooth, dir.x, dir.y, dir.z);
|
|
light_data[i*LIGHT_SIZE + 3] = make_float4(samples, 0.0f, 0.0f, 0.0f);
|
|
}
|
|
}
|
|
|
|
device->tex_alloc("__light_data", dscene->light_data);
|
|
}
|
|
|
|
void LightManager::device_update(Device *device, DeviceScene *dscene, Scene *scene, Progress& progress)
|
|
{
|
|
if(!need_update)
|
|
return;
|
|
|
|
device_free(device, dscene);
|
|
|
|
device_update_points(device, dscene, scene);
|
|
if(progress.get_cancel()) return;
|
|
|
|
device_update_distribution(device, dscene, scene, progress);
|
|
if(progress.get_cancel()) return;
|
|
|
|
device_update_background(device, dscene, scene, progress);
|
|
if(progress.get_cancel()) return;
|
|
|
|
need_update = false;
|
|
}
|
|
|
|
void LightManager::device_free(Device *device, DeviceScene *dscene)
|
|
{
|
|
device->tex_free(dscene->light_distribution);
|
|
device->tex_free(dscene->light_data);
|
|
device->tex_free(dscene->light_background_marginal_cdf);
|
|
device->tex_free(dscene->light_background_conditional_cdf);
|
|
|
|
dscene->light_distribution.clear();
|
|
dscene->light_data.clear();
|
|
dscene->light_background_marginal_cdf.clear();
|
|
dscene->light_background_conditional_cdf.clear();
|
|
}
|
|
|
|
void LightManager::tag_update(Scene *scene)
|
|
{
|
|
need_update = true;
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|
|
|