diff options
Diffstat (limited to 'intern/cycles/render/light.cpp')
| -rw-r--r-- | intern/cycles/render/light.cpp | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/intern/cycles/render/light.cpp b/intern/cycles/render/light.cpp new file mode 100644 index 00000000000..88a797f753d --- /dev/null +++ b/intern/cycles/render/light.cpp @@ -0,0 +1,220 @@ +/* + * Copyright 2011, Blender Foundation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#include "device.h" +#include "light.h" +#include "mesh.h" +#include "object.h" +#include "scene.h" +#include "shader.h" + +#include "util_foreach.h" +#include "util_progress.h" + +CCL_NAMESPACE_BEGIN + +/* Light */ + +Light::Light() +{ + co = make_float3(0.0f, 0.0f, 0.0f); + radius = 0.0f; + shader = 0; +} + +void Light::tag_update(Scene *scene) +{ + scene->light_manager->need_update = true; +} + +/* Light Manager */ + +LightManager::LightManager() +{ + need_update = true; +} + +LightManager::~LightManager() +{ +} + +void LightManager::device_update_distribution(Device *device, DeviceScene *dscene, Scene *scene, Progress& progress) +{ + /* count */ + size_t num_lights = scene->lights.size(); + size_t num_triangles = 0; + + foreach(Object *object, scene->objects) { + Mesh *mesh = object->mesh; + + for(size_t i = 0; i < mesh->triangles.size(); i++) { + Shader *shader = scene->shaders[mesh->shader[i]]; + + if(shader->has_surface_emission) + num_triangles++; + } + } + + size_t num_distribution = num_triangles + num_lights; + + /* emission area */ + float4 *distribution = dscene->light_distribution.resize(num_distribution + 1); + float totarea = 0.0f; + + /* triangles */ + size_t offset = 0; + size_t j = 0; + + foreach(Object *object, scene->objects) { + Mesh *mesh = object->mesh; + Transform tfm = object->tfm; + int object_id = (mesh->transform_applied)? -j-1: j; + + for(size_t i = 0; i < mesh->triangles.size(); i++) { + Shader *shader = scene->shaders[mesh->shader[i]]; + + if(shader->has_surface_emission) { + distribution[offset].x = totarea; + distribution[offset].y = __int_as_float(i + mesh->tri_offset); + distribution[offset].z = 1.0f; + distribution[offset].w = __int_as_float(object_id); + offset++; + + Mesh::Triangle t = mesh->triangles[i]; + float3 p1 = transform(&tfm, mesh->verts[t.v[0]]); + float3 p2 = transform(&tfm, mesh->verts[t.v[1]]); + float3 p3 = transform(&tfm, mesh->verts[t.v[2]]); + + totarea += triangle_area(p1, p2, p3); + } + } + + if(progress.get_cancel()) return; + + j++; + } + + float trianglearea = totarea; + + /* point lights */ + float lightarea = (totarea > 0.0f)? totarea/scene->lights.size(): 1.0f; + + for(size_t i = 0; i < scene->lights.size(); i++, offset++) { + distribution[offset].x = totarea; + distribution[offset].y = __int_as_float(-i-1); + distribution[offset].z = 1.0f; + distribution[offset].w = scene->lights[i]->radius; + totarea += lightarea; + } + + /* normalize cumulative distribution functions */ + distribution[num_distribution].x = totarea; + distribution[num_distribution].y = 0.0f; + distribution[num_distribution].z = 0.0f; + distribution[num_distribution].w = 0.0f; + + if(totarea > 0.0f) { + for(size_t i = 0; i < num_distribution; i++) + distribution[i].x /= totarea; + distribution[num_distribution].x = 1.0f; + } + + if(progress.get_cancel()) return; + + /* update device */ + KernelIntegrator *kintegrator = &dscene->data.integrator; + kintegrator->use_emission = (totarea > 0.0f); + + if(kintegrator->use_emission) { + /* number of emissives */ + kintegrator->num_triangles = num_triangles; + kintegrator->num_lights = num_lights; + kintegrator->num_distribution = num_distribution; + + /* precompute pdfs */ + kintegrator->pdf_triangles = 0.0f; + kintegrator->pdf_lights = 0.0f; + + if(trianglearea > 0.0f) { + kintegrator->pdf_triangles = 1.0f/trianglearea; + if(num_lights) + kintegrator->pdf_triangles *= 0.5f; + } + + if(num_lights) { + kintegrator->pdf_lights = 1.0f/num_lights; + if(trianglearea > 0.0f) + kintegrator->pdf_lights *= 0.5f; + } + + /* CDF */ + device->tex_alloc("__light_distribution", dscene->light_distribution); + } + else + dscene->light_distribution.clear(); +} + +void LightManager::device_update_points(Device *device, DeviceScene *dscene, Scene *scene) +{ + if(scene->lights.size() == 0) + return; + + float4 *light_point = dscene->light_point.resize(scene->lights.size()); + + for(size_t i = 0; i < scene->lights.size(); i++) { + float3 co = scene->lights[i]->co; + int shader_id = scene->shader_manager->get_shader_id(scene->lights[i]->shader); + + light_point[i] = make_float4(co.x, co.y, co.z, __int_as_float(shader_id)); + } + + device->tex_alloc("__light_point", dscene->light_point); +} + +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; + + need_update = false; +} + +void LightManager::device_free(Device *device, DeviceScene *dscene) +{ + device->tex_free(dscene->light_distribution); + device->tex_free(dscene->light_point); + + dscene->light_distribution.clear(); + dscene->light_point.clear(); +} + +void LightManager::tag_update(Scene *scene) +{ + need_update = true; +} + +CCL_NAMESPACE_END + |