1/**************************************************************************/
2/* lightmap_raycaster_embree.cpp */
3/**************************************************************************/
4/* This file is part of: */
5/* GODOT ENGINE */
6/* https://godotengine.org */
7/**************************************************************************/
8/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
9/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
10/* */
11/* Permission is hereby granted, free of charge, to any person obtaining */
12/* a copy of this software and associated documentation files (the */
13/* "Software"), to deal in the Software without restriction, including */
14/* without limitation the rights to use, copy, modify, merge, publish, */
15/* distribute, sublicense, and/or sell copies of the Software, and to */
16/* permit persons to whom the Software is furnished to do so, subject to */
17/* the following conditions: */
18/* */
19/* The above copyright notice and this permission notice shall be */
20/* included in all copies or substantial portions of the Software. */
21/* */
22/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
23/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
24/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
25/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
26/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
27/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
28/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
29/**************************************************************************/
30
31#ifdef TOOLS_ENABLED
32
33#include "lightmap_raycaster_embree.h"
34
35#ifdef __SSE2__
36#include <pmmintrin.h>
37#endif
38
39LightmapRaycaster *LightmapRaycasterEmbree::create_embree_raycaster() {
40 return memnew(LightmapRaycasterEmbree);
41}
42
43void LightmapRaycasterEmbree::make_default_raycaster() {
44 create_function = create_embree_raycaster;
45}
46
47void LightmapRaycasterEmbree::filter_function(const struct RTCFilterFunctionNArguments *p_args) {
48 RTCHit *hit = (RTCHit *)p_args->hit;
49
50 unsigned int geomID = hit->geomID;
51 float u = hit->u;
52 float v = hit->v;
53
54 LightmapRaycasterEmbree *scene = (LightmapRaycasterEmbree *)p_args->geometryUserPtr;
55 RTCGeometry geom = rtcGetGeometry(scene->embree_scene, geomID);
56
57 rtcInterpolate0(geom, hit->primID, hit->u, hit->v, RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE, 0, &hit->u, 2);
58
59 if (scene->alpha_textures.has(geomID)) {
60 const AlphaTextureData &alpha_texture = scene->alpha_textures[geomID];
61
62 if (alpha_texture.sample(hit->u, hit->v) < 128) {
63 p_args->valid[0] = 0;
64 return;
65 }
66 }
67
68 rtcInterpolate0(geom, hit->primID, u, v, RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE, 1, &hit->Ng_x, 3);
69}
70
71bool LightmapRaycasterEmbree::intersect(Ray &r_ray) {
72 RTCIntersectContext context;
73
74 rtcInitIntersectContext(&context);
75
76 rtcIntersect1(embree_scene, &context, (RTCRayHit *)&r_ray);
77 return r_ray.geomID != RTC_INVALID_GEOMETRY_ID;
78}
79
80void LightmapRaycasterEmbree::intersect(Vector<Ray> &r_rays) {
81 Ray *rays = r_rays.ptrw();
82 for (int i = 0; i < r_rays.size(); ++i) {
83 intersect(rays[i]);
84 }
85}
86
87void LightmapRaycasterEmbree::set_mesh_alpha_texture(Ref<Image> p_alpha_texture, unsigned int p_id) {
88 if (p_alpha_texture.is_valid() && p_alpha_texture->get_size() != Vector2i()) {
89 AlphaTextureData tex;
90 tex.size = p_alpha_texture->get_size();
91 tex.data = p_alpha_texture->get_data();
92 alpha_textures.insert(p_id, tex);
93 }
94}
95
96float blerp(float c00, float c10, float c01, float c11, float tx, float ty) {
97 return Math::lerp(Math::lerp(c00, c10, tx), Math::lerp(c01, c11, tx), ty);
98}
99
100uint8_t LightmapRaycasterEmbree::AlphaTextureData::sample(float u, float v) const {
101 float x = u * size.x;
102 float y = v * size.y;
103 int xi = (int)x;
104 int yi = (int)y;
105
106 uint8_t texels[4];
107
108 for (int i = 0; i < 4; ++i) {
109 int sample_x = CLAMP(xi + i % 2, 0, size.x - 1);
110 int sample_y = CLAMP(yi + i / 2, 0, size.y - 1);
111 texels[i] = data[sample_y * size.x + sample_x];
112 }
113
114 return Math::round(blerp(texels[0], texels[1], texels[2], texels[3], x - xi, y - yi));
115}
116
117void LightmapRaycasterEmbree::add_mesh(const Vector<Vector3> &p_vertices, const Vector<Vector3> &p_normals, const Vector<Vector2> &p_uv2s, unsigned int p_id) {
118 RTCGeometry embree_mesh = rtcNewGeometry(embree_device, RTC_GEOMETRY_TYPE_TRIANGLE);
119
120 rtcSetGeometryVertexAttributeCount(embree_mesh, 2);
121
122 int vertex_count = p_vertices.size();
123
124 ERR_FAIL_COND(vertex_count % 3 != 0);
125 ERR_FAIL_COND(vertex_count != p_uv2s.size());
126 ERR_FAIL_COND(!p_normals.is_empty() && vertex_count != p_normals.size());
127
128 Vector3 *embree_vertices = (Vector3 *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_VERTEX, 0, RTC_FORMAT_FLOAT3, sizeof(Vector3), vertex_count);
129 memcpy(embree_vertices, p_vertices.ptr(), sizeof(Vector3) * vertex_count);
130
131 Vector2 *embree_light_uvs = (Vector2 *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE, 0, RTC_FORMAT_FLOAT2, sizeof(Vector2), vertex_count);
132 memcpy(embree_light_uvs, p_uv2s.ptr(), sizeof(Vector2) * vertex_count);
133
134 uint32_t *embree_triangles = (uint32_t *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_INDEX, 0, RTC_FORMAT_UINT3, sizeof(uint32_t) * 3, vertex_count / 3);
135 for (int i = 0; i < vertex_count; i++) {
136 embree_triangles[i] = i;
137 }
138
139 if (!p_normals.is_empty()) {
140 Vector3 *embree_normals = (Vector3 *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE, 1, RTC_FORMAT_FLOAT3, sizeof(Vector3), vertex_count);
141 memcpy(embree_normals, p_normals.ptr(), sizeof(Vector3) * vertex_count);
142 }
143
144 rtcCommitGeometry(embree_mesh);
145 rtcSetGeometryIntersectFilterFunction(embree_mesh, filter_function);
146 rtcSetGeometryUserData(embree_mesh, this);
147 rtcAttachGeometryByID(embree_scene, embree_mesh, p_id);
148 rtcReleaseGeometry(embree_mesh);
149}
150
151void LightmapRaycasterEmbree::commit() {
152 rtcCommitScene(embree_scene);
153}
154
155void LightmapRaycasterEmbree::set_mesh_filter(const HashSet<int> &p_mesh_ids) {
156 for (const int &E : p_mesh_ids) {
157 rtcDisableGeometry(rtcGetGeometry(embree_scene, E));
158 }
159 rtcCommitScene(embree_scene);
160 filter_meshes = p_mesh_ids;
161}
162
163void LightmapRaycasterEmbree::clear_mesh_filter() {
164 for (const int &E : filter_meshes) {
165 rtcEnableGeometry(rtcGetGeometry(embree_scene, E));
166 }
167 rtcCommitScene(embree_scene);
168 filter_meshes.clear();
169}
170
171void embree_lm_error_handler(void *p_user_data, RTCError p_code, const char *p_str) {
172 print_error("Embree error: " + String(p_str));
173}
174
175LightmapRaycasterEmbree::LightmapRaycasterEmbree() {
176#ifdef __SSE2__
177 _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
178 _MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON);
179#endif
180
181 embree_device = rtcNewDevice(nullptr);
182 rtcSetDeviceErrorFunction(embree_device, &embree_lm_error_handler, nullptr);
183 embree_scene = rtcNewScene(embree_device);
184}
185
186LightmapRaycasterEmbree::~LightmapRaycasterEmbree() {
187 if (embree_scene != nullptr) {
188 rtcReleaseScene(embree_scene);
189 }
190
191 if (embree_device != nullptr) {
192 rtcReleaseDevice(embree_device);
193 }
194}
195
196#endif // TOOLS_ENABLED
197