/**************************************************************************/
/* register_types.cpp */
/**************************************************************************/
/* This file is part of: */
/* REDOT ENGINE */
/* https://redotengine.org */
/**************************************************************************/
/* Copyright (c) 2024-present Redot Engine contributors */
/* (see REDOT_AUTHORS.md) */
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* 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. */
/**************************************************************************/
#include "register_types.h"
#include "core/crypto/crypto_core.h"
#include <xatlas.h>
extern bool (*array_mesh_lightmap_unwrap_callback)(float p_texel_size, const float *p_vertices, const float *p_normals, int p_vertex_count, const int *p_indices, int p_index_count, const uint8_t *p_cache_data, bool *r_use_cache, uint8_t **r_mesh_cache, int *r_mesh_cache_size, float **r_uv, int **r_vertex, int *r_vertex_count, int **r_index, int *r_index_count, int *r_size_hint_x, int *r_size_hint_y);
bool xatlas_mesh_lightmap_unwrap_callback(float p_texel_size, const float *p_vertices, const float *p_normals, int p_vertex_count, const int *p_indices, int p_index_count, const uint8_t *p_cache_data, bool *r_use_cache, uint8_t **r_mesh_cache, int *r_mesh_cache_size, float **r_uv, int **r_vertex, int *r_vertex_count, int **r_index, int *r_index_count, int *r_size_hint_x, int *r_size_hint_y) {
CryptoCore::MD5Context ctx;
ctx.start();
ctx.update((unsigned char *)&p_texel_size, sizeof(float));
ctx.update((unsigned char *)p_indices, sizeof(int) * p_index_count);
ctx.update((unsigned char *)p_vertices, sizeof(float) * p_vertex_count * 3);
ctx.update((unsigned char *)p_normals, sizeof(float) * p_vertex_count * 3);
unsigned char hash[16];
ctx.finish(hash);
bool cached = false;
unsigned int cache_idx = 0;
*r_mesh_cache = nullptr;
*r_mesh_cache_size = 0;
if (p_cache_data) {
//Check if hash is in cache data
int *cache_data = (int *)p_cache_data;
int n_entries = cache_data[0];
unsigned int read_idx = 1;
for (int i = 0; i < n_entries; ++i) {
if (memcmp(&cache_data[read_idx], hash, 16) == 0) {
cached = true;
cache_idx = read_idx;
break;
}
read_idx += 4; // hash
read_idx += 2; // size hint
int vertex_count = cache_data[read_idx];
read_idx += 1; // vertex count
read_idx += vertex_count; // vertex
read_idx += vertex_count * 2; // uvs
int index_count = cache_data[read_idx];
read_idx += 1; // index count
read_idx += index_count; // indices
}
}
if (cached) {
int *cache_data = (int *)p_cache_data;
cache_idx += 4;
// Load size
*r_size_hint_x = cache_data[cache_idx];
*r_size_hint_y = cache_data[cache_idx + 1];
cache_idx += 2;
// Load vertices
*r_vertex_count = cache_data[cache_idx];
cache_idx++;
*r_vertex = &cache_data[cache_idx];
cache_idx += *r_vertex_count;
// Load UVs
*r_uv = (float *)&cache_data[cache_idx];
cache_idx += *r_vertex_count * 2;
// Load indices
*r_index_count = cache_data[cache_idx];
cache_idx++;
*r_index = &cache_data[cache_idx];
} else {
// set up input mesh
xatlas::MeshDecl input_mesh;
input_mesh.indexData = p_indices;
input_mesh.indexCount = p_index_count;
input_mesh.indexFormat = xatlas::IndexFormat::UInt32;
input_mesh.vertexCount = p_vertex_count;
input_mesh.vertexPositionData = p_vertices;
input_mesh.vertexPositionStride = sizeof(float) * 3;
input_mesh.vertexNormalData = p_normals;
input_mesh.vertexNormalStride = sizeof(uint32_t) * 3;
input_mesh.vertexUvData = nullptr;
input_mesh.vertexUvStride = 0;
xatlas::ChartOptions chart_options;
chart_options.fixWinding = true;
ERR_FAIL_COND_V_MSG(p_texel_size <= 0.0f, false, "Texel size must be greater than 0.");
xatlas::PackOptions pack_options;
pack_options.padding = 1;
pack_options.maxChartSize = 4094; // Lightmap atlassing needs 2 for padding between meshes, so 4096-2
pack_options.blockAlign = true;
pack_options.texelsPerUnit = 1.0 / p_texel_size;
xatlas::Atlas *atlas = xatlas::Create();
xatlas::AddMeshError err = xatlas::AddMesh(atlas, input_mesh, 1);
ERR_FAIL_COND_V_MSG(err != xatlas::AddMeshError::Success, false, xatlas::StringForEnum(err));
xatlas::Generate(atlas, chart_options, pack_options);
*r_size_hint_x = atlas->width;
*r_size_hint_y = atlas->height;
float w = *r_size_hint_x;
float h = *r_size_hint_y;
if (w == 0 || h == 0) {
xatlas::Destroy(atlas);
return false; //could not bake because there is no area
}
const xatlas::Mesh &output = atlas->meshes[0];
*r_vertex = (int *)memalloc(sizeof(int) * output.vertexCount);
ERR_FAIL_NULL_V_MSG(*r_vertex, false, "Out of memory.");
*r_uv = (float *)memalloc(sizeof(float) * output.vertexCount * 2);
ERR_FAIL_NULL_V_MSG(*r_uv, false, "Out of memory.");
*r_index = (int *)memalloc(sizeof(int) * output.indexCount);
ERR_FAIL_NULL_V_MSG(*r_index, false, "Out of memory.");
float max_x = 0;
float max_y = 0;
for (uint32_t i = 0; i < output.vertexCount; i++) {
(*r_vertex)[i] = output.vertexArray[i].xref;
(*r_uv)[i * 2 + 0] = output.vertexArray[i].uv[0] / w;
(*r_uv)[i * 2 + 1] = output.vertexArray[i].uv[1] / h;
max_x = MAX(max_x, output.vertexArray[i].uv[0]);
max_y = MAX(max_y, output.vertexArray[i].uv[1]);
}
*r_vertex_count = output.vertexCount;
for (uint32_t i = 0; i < output.indexCount; i++) {
(*r_index)[i] = output.indexArray[i];
}
*r_index_count = output.indexCount;
xatlas::Destroy(atlas);
}
if (*r_use_cache) {
// Build cache data for current mesh
unsigned int new_cache_size = 4 + 2 + 1 + *r_vertex_count + (*r_vertex_count * 2) + 1 + *r_index_count; // hash + size hint + vertex_count + vertices + uvs + index_count + indices
new_cache_size *= sizeof(int);
int *new_cache_data = (int *)memalloc(new_cache_size);
unsigned int new_cache_idx = 0;
// hash
memcpy(&new_cache_data[new_cache_idx], hash, 16);
new_cache_idx += 4;
// size hint
new_cache_data[new_cache_idx] = *r_size_hint_x;
new_cache_data[new_cache_idx + 1] = *r_size_hint_y;
new_cache_idx += 2;
// vertex count
new_cache_data[new_cache_idx] = *r_vertex_count;
new_cache_idx++;
// vertices
memcpy(&new_cache_data[new_cache_idx], *r_vertex, sizeof(int) * (*r_vertex_count));
new_cache_idx += *r_vertex_count;
// uvs
memcpy(&new_cache_data[new_cache_idx], *r_uv, sizeof(float) * (*r_vertex_count) * 2);
new_cache_idx += *r_vertex_count * 2;
// index count
new_cache_data[new_cache_idx] = *r_index_count;
new_cache_idx++;
// indices
memcpy(&new_cache_data[new_cache_idx], *r_index, sizeof(int) * (*r_index_count));
// Return cache data to the caller
*r_mesh_cache = (uint8_t *)new_cache_data;
*r_mesh_cache_size = new_cache_size;
}
*r_use_cache = cached; // Return whether cache was used.
return true;
}
void initialize_xatlas_unwrap_module(ModuleInitializationLevel p_level) {
if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
return;
}
array_mesh_lightmap_unwrap_callback = xatlas_mesh_lightmap_unwrap_callback;
}
void uninitialize_xatlas_unwrap_module(ModuleInitializationLevel p_level) {
if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
return;
}
}