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