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Diffstat (limited to 'modules/raycast/lightmap_raycaster.cpp')
| -rw-r--r-- | modules/raycast/lightmap_raycaster.cpp | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/modules/raycast/lightmap_raycaster.cpp b/modules/raycast/lightmap_raycaster.cpp new file mode 100644 index 0000000000..9039622d3d --- /dev/null +++ b/modules/raycast/lightmap_raycaster.cpp @@ -0,0 +1,202 @@ +/*************************************************************************/ +/* lightmap_raycaster.cpp */ +/*************************************************************************/ +/* This file is part of: */ +/* GODOT ENGINE */ +/* https://godotengine.org */ +/*************************************************************************/ +/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */ +/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */ +/* */ +/* Permission is hereby granted, free of charge, to any person obtaining */ +/* a copy of this software and associated documentation files (the */ +/* "Software"), to deal in the Software without restriction, including */ +/* without limitation the rights to use, copy, modify, merge, publish, */ +/* distribute, sublicense, and/or sell copies of the Software, and to */ +/* permit persons to whom the Software is furnished to do so, subject to */ +/* the following conditions: */ +/* */ +/* The above copyright notice and this permission notice shall be */ +/* included in all copies or substantial portions of the Software. */ +/* */ +/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ +/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ +/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ +/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ +/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ +/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ +/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ +/*************************************************************************/ + +#ifdef TOOLS_ENABLED + +#include "lightmap_raycaster.h" + +// From Embree. +#include <math/vec2.h> +#include <math/vec3.h> + +#include <pmmintrin.h> + +using namespace embree; + +LightmapRaycaster *LightmapRaycasterEmbree::create_embree_raycaster() { + return memnew(LightmapRaycasterEmbree); +} + +void LightmapRaycasterEmbree::make_default_raycaster() { + create_function = create_embree_raycaster; +} + +void LightmapRaycasterEmbree::filter_function(const struct RTCFilterFunctionNArguments *p_args) { + RTCHit *hit = (RTCHit *)p_args->hit; + + unsigned int geomID = hit->geomID; + float u = hit->u; + float v = hit->v; + + LightmapRaycasterEmbree *scene = (LightmapRaycasterEmbree *)p_args->geometryUserPtr; + RTCGeometry geom = rtcGetGeometry(scene->embree_scene, geomID); + + rtcInterpolate0(geom, hit->primID, hit->u, hit->v, RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE, 0, &hit->u, 2); + + if (scene->alpha_textures.has(geomID)) { + const AlphaTextureData &alpha_texture = scene->alpha_textures[geomID]; + + if (alpha_texture.sample(hit->u, hit->v) < 128) { + p_args->valid[0] = 0; + return; + } + } + + rtcInterpolate0(geom, hit->primID, u, v, RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE, 1, &hit->Ng_x, 3); +} + +bool LightmapRaycasterEmbree::intersect(Ray &r_ray) { + RTCIntersectContext context; + + rtcInitIntersectContext(&context); + + rtcIntersect1(embree_scene, &context, (RTCRayHit *)&r_ray); + return r_ray.geomID != RTC_INVALID_GEOMETRY_ID; +} + +void LightmapRaycasterEmbree::intersect(Vector<Ray> &r_rays) { + Ray *rays = r_rays.ptrw(); + for (int i = 0; i < r_rays.size(); ++i) { + intersect(rays[i]); + } +} + +void LightmapRaycasterEmbree::set_mesh_alpha_texture(Ref<Image> p_alpha_texture, unsigned int p_id) { + if (p_alpha_texture.is_valid() && p_alpha_texture->get_size() != Vector2i()) { + AlphaTextureData tex; + tex.size = p_alpha_texture->get_size(); + tex.data = p_alpha_texture->get_data(); + alpha_textures.insert(p_id, tex); + } +} + +float blerp(float c00, float c10, float c01, float c11, float tx, float ty) { + return Math::lerp(Math::lerp(c00, c10, tx), Math::lerp(c01, c11, tx), ty); +} + +uint8_t LightmapRaycasterEmbree::AlphaTextureData::sample(float u, float v) const { + float x = u * size.x; + float y = v * size.y; + int xi = (int)x; + int yi = (int)y; + + uint8_t texels[4]; + + for (int i = 0; i < 4; ++i) { + int sample_x = CLAMP(xi + i % 2, 0, size.x - 1); + int sample_y = CLAMP(yi + i / 2, 0, size.y - 1); + texels[i] = data[sample_y * size.x + sample_x]; + } + + return Math::round(blerp(texels[0], texels[1], texels[2], texels[3], x - xi, y - yi)); +} + +void LightmapRaycasterEmbree::add_mesh(const Vector<Vector3> &p_vertices, const Vector<Vector3> &p_normals, const Vector<Vector2> &p_uv2s, unsigned int p_id) { + RTCGeometry embree_mesh = rtcNewGeometry(embree_device, RTC_GEOMETRY_TYPE_TRIANGLE); + + rtcSetGeometryVertexAttributeCount(embree_mesh, 2); + + int vertex_count = p_vertices.size(); + + ERR_FAIL_COND(vertex_count % 3 != 0); + ERR_FAIL_COND(vertex_count != p_uv2s.size()); + + Vec3fa *embree_vertices = (Vec3fa *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_VERTEX, 0, RTC_FORMAT_FLOAT3, sizeof(Vec3fa), vertex_count); + Vec2fa *embree_light_uvs = (Vec2fa *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE, 0, RTC_FORMAT_FLOAT2, sizeof(Vec2fa), vertex_count); + uint32_t *embree_triangles = (uint32_t *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_INDEX, 0, RTC_FORMAT_UINT3, sizeof(uint32_t) * 3, vertex_count / 3); + + Vec3fa *embree_normals = nullptr; + if (!p_normals.is_empty()) { + embree_normals = (Vec3fa *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE, 1, RTC_FORMAT_FLOAT3, sizeof(Vec3fa), vertex_count); + } + + for (int i = 0; i < vertex_count; i++) { + embree_vertices[i] = Vec3fa(p_vertices[i].x, p_vertices[i].y, p_vertices[i].z); + embree_light_uvs[i] = Vec2fa(p_uv2s[i].x, p_uv2s[i].y); + if (embree_normals != nullptr) { + embree_normals[i] = Vec3fa(p_normals[i].x, p_normals[i].y, p_normals[i].z); + } + embree_triangles[i] = i; + } + + rtcCommitGeometry(embree_mesh); + rtcSetGeometryIntersectFilterFunction(embree_mesh, filter_function); + rtcSetGeometryUserData(embree_mesh, this); + rtcAttachGeometryByID(embree_scene, embree_mesh, p_id); + rtcReleaseGeometry(embree_mesh); +} + +void LightmapRaycasterEmbree::commit() { + rtcCommitScene(embree_scene); +} + +void LightmapRaycasterEmbree::set_mesh_filter(const Set<int> &p_mesh_ids) { + for (Set<int>::Element *E = p_mesh_ids.front(); E; E = E->next()) { + rtcDisableGeometry(rtcGetGeometry(embree_scene, E->get())); + } + rtcCommitScene(embree_scene); + filter_meshes = p_mesh_ids; +} + +void LightmapRaycasterEmbree::clear_mesh_filter() { + for (Set<int>::Element *E = filter_meshes.front(); E; E = E->next()) { + rtcEnableGeometry(rtcGetGeometry(embree_scene, E->get())); + } + rtcCommitScene(embree_scene); + filter_meshes.clear(); +} + +void embree_error_handler(void *p_user_data, RTCError p_code, const char *p_str) { + print_error("Embree error: " + String(p_str)); +} + +LightmapRaycasterEmbree::LightmapRaycasterEmbree() { + _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON); + _MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON); + + embree_device = rtcNewDevice(nullptr); + rtcSetDeviceErrorFunction(embree_device, &embree_error_handler, nullptr); + embree_scene = rtcNewScene(embree_device); +} + +LightmapRaycasterEmbree::~LightmapRaycasterEmbree() { + _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_OFF); + _MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_OFF); + + if (embree_scene != nullptr) { + rtcReleaseScene(embree_scene); + } + + if (embree_device != nullptr) { + rtcReleaseDevice(embree_device); + } +} + +#endif |