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/*************************************************************************/
/* 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"
#ifdef __SSE2__
#include <pmmintrin.h>
#endif
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());
ERR_FAIL_COND(!p_normals.is_empty() && vertex_count != p_normals.size());
Vector3 *embree_vertices = (Vector3 *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_VERTEX, 0, RTC_FORMAT_FLOAT3, sizeof(Vector3), vertex_count);
memcpy(embree_vertices, p_vertices.ptr(), sizeof(Vector3) * vertex_count);
Vector2 *embree_light_uvs = (Vector2 *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE, 0, RTC_FORMAT_FLOAT2, sizeof(Vector2), vertex_count);
memcpy(embree_light_uvs, p_uv2s.ptr(), sizeof(Vector2) * 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);
for (int i = 0; i < vertex_count; i++) {
embree_triangles[i] = i;
}
if (!p_normals.is_empty()) {
Vector3 *embree_normals = (Vector3 *)rtcSetNewGeometryBuffer(embree_mesh, RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE, 1, RTC_FORMAT_FLOAT3, sizeof(Vector3), vertex_count);
memcpy(embree_normals, p_normals.ptr(), sizeof(Vector3) * vertex_count);
}
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_lm_error_handler(void *p_user_data, RTCError p_code, const char *p_str) {
print_error("Embree error: " + String(p_str));
}
LightmapRaycasterEmbree::LightmapRaycasterEmbree() {
#ifdef __SSE2__
_MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
_MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON);
#endif
embree_device = rtcNewDevice(nullptr);
rtcSetDeviceErrorFunction(embree_device, &embree_lm_error_handler, nullptr);
embree_scene = rtcNewScene(embree_device);
}
LightmapRaycasterEmbree::~LightmapRaycasterEmbree() {
if (embree_scene != nullptr) {
rtcReleaseScene(embree_scene);
}
if (embree_device != nullptr) {
rtcReleaseDevice(embree_device);
}
}
#endif
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