229 lines
8.4 KiB
C++
229 lines
8.4 KiB
C++
/*************************************************************************/
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/* register_types.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 "register_types.h"
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#include "core/crypto/crypto_core.h"
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#include "thirdparty/xatlas/xatlas.h"
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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);
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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) {
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CryptoCore::MD5Context ctx;
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ctx.start();
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ctx.update((unsigned char *)&p_texel_size, sizeof(float));
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ctx.update((unsigned char *)p_indices, sizeof(int) * p_index_count);
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ctx.update((unsigned char *)p_vertices, sizeof(float) * p_vertex_count * 3);
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ctx.update((unsigned char *)p_normals, sizeof(float) * p_vertex_count * 3);
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unsigned char hash[16];
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ctx.finish(hash);
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bool cached = false;
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unsigned int cache_idx = 0;
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*r_mesh_cache = nullptr;
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*r_mesh_cache_size = 0;
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if (p_cache_data) {
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//Check if hash is in cache data
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int *cache_data = (int *)p_cache_data;
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int n_entries = cache_data[0];
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unsigned int read_idx = 1;
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for (int i = 0; i < n_entries; ++i) {
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if (memcmp(&cache_data[read_idx], hash, 16) == 0) {
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cached = true;
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cache_idx = read_idx;
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break;
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}
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read_idx += 4; // hash
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read_idx += 2; // size hint
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int vertex_count = cache_data[read_idx];
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read_idx += 1; // vertex count
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read_idx += vertex_count; // vertex
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read_idx += vertex_count * 2; // uvs
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int index_count = cache_data[read_idx];
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read_idx += 1; // index count
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read_idx += index_count; // indices
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}
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}
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if (cached) {
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int *cache_data = (int *)p_cache_data;
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cache_idx += 4;
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// Load size
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*r_size_hint_x = cache_data[cache_idx];
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*r_size_hint_y = cache_data[cache_idx + 1];
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cache_idx += 2;
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// Load vertices
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*r_vertex_count = cache_data[cache_idx];
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cache_idx++;
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*r_vertex = &cache_data[cache_idx];
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cache_idx += *r_vertex_count;
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// Load UVs
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*r_uv = (float *)&cache_data[cache_idx];
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cache_idx += *r_vertex_count * 2;
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// Load indices
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*r_index_count = cache_data[cache_idx];
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cache_idx++;
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*r_index = &cache_data[cache_idx];
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} else {
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// set up input mesh
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xatlas::MeshDecl input_mesh;
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input_mesh.indexData = p_indices;
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input_mesh.indexCount = p_index_count;
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input_mesh.indexFormat = xatlas::IndexFormat::UInt32;
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input_mesh.vertexCount = p_vertex_count;
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input_mesh.vertexPositionData = p_vertices;
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input_mesh.vertexPositionStride = sizeof(float) * 3;
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input_mesh.vertexNormalData = p_normals;
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input_mesh.vertexNormalStride = sizeof(uint32_t) * 3;
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input_mesh.vertexUvData = nullptr;
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input_mesh.vertexUvStride = 0;
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xatlas::ChartOptions chart_options;
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chart_options.fixWinding = true;
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xatlas::PackOptions pack_options;
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pack_options.padding = 1;
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pack_options.maxChartSize = 4094; // Lightmap atlassing needs 2 for padding between meshes, so 4096-2
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pack_options.blockAlign = true;
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pack_options.texelsPerUnit = 1.0 / p_texel_size;
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xatlas::Atlas *atlas = xatlas::Create();
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xatlas::AddMeshError err = xatlas::AddMesh(atlas, input_mesh, 1);
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ERR_FAIL_COND_V_MSG(err != xatlas::AddMeshError::Success, false, xatlas::StringForEnum(err));
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xatlas::Generate(atlas, chart_options, pack_options);
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*r_size_hint_x = atlas->width;
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*r_size_hint_y = atlas->height;
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float w = *r_size_hint_x;
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float h = *r_size_hint_y;
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if (w == 0 || h == 0) {
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xatlas::Destroy(atlas);
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return false; //could not bake because there is no area
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}
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const xatlas::Mesh &output = atlas->meshes[0];
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*r_vertex = (int *)memalloc(sizeof(int) * output.vertexCount);
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ERR_FAIL_NULL_V_MSG(*r_vertex, false, "Out of memory.");
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*r_uv = (float *)memalloc(sizeof(float) * output.vertexCount * 2);
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ERR_FAIL_NULL_V_MSG(*r_uv, false, "Out of memory.");
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*r_index = (int *)memalloc(sizeof(int) * output.indexCount);
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ERR_FAIL_NULL_V_MSG(*r_index, false, "Out of memory.");
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float max_x = 0;
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float max_y = 0;
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for (uint32_t i = 0; i < output.vertexCount; i++) {
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(*r_vertex)[i] = output.vertexArray[i].xref;
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(*r_uv)[i * 2 + 0] = output.vertexArray[i].uv[0] / w;
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(*r_uv)[i * 2 + 1] = output.vertexArray[i].uv[1] / h;
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max_x = MAX(max_x, output.vertexArray[i].uv[0]);
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max_y = MAX(max_y, output.vertexArray[i].uv[1]);
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}
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*r_vertex_count = output.vertexCount;
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for (uint32_t i = 0; i < output.indexCount; i++) {
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(*r_index)[i] = output.indexArray[i];
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}
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*r_index_count = output.indexCount;
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xatlas::Destroy(atlas);
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}
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if (*r_use_cache) {
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// Build cache data for current mesh
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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
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new_cache_size *= sizeof(int);
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int *new_cache_data = (int *)memalloc(new_cache_size);
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unsigned int new_cache_idx = 0;
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// hash
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memcpy(&new_cache_data[new_cache_idx], hash, 16);
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new_cache_idx += 4;
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// size hint
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new_cache_data[new_cache_idx] = *r_size_hint_x;
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new_cache_data[new_cache_idx + 1] = *r_size_hint_y;
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new_cache_idx += 2;
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// vertex count
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new_cache_data[new_cache_idx] = *r_vertex_count;
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new_cache_idx++;
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// vertices
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memcpy(&new_cache_data[new_cache_idx], *r_vertex, sizeof(int) * (*r_vertex_count));
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new_cache_idx += *r_vertex_count;
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// uvs
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memcpy(&new_cache_data[new_cache_idx], *r_uv, sizeof(float) * (*r_vertex_count) * 2);
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new_cache_idx += *r_vertex_count * 2;
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// index count
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new_cache_data[new_cache_idx] = *r_index_count;
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new_cache_idx++;
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// indices
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memcpy(&new_cache_data[new_cache_idx], *r_index, sizeof(int) * (*r_index_count));
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// Return cache data to the caller
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*r_mesh_cache = (uint8_t *)new_cache_data;
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*r_mesh_cache_size = new_cache_size;
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}
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*r_use_cache = cached; // Return whether cache was used.
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return true;
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}
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void register_xatlas_unwrap_types() {
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array_mesh_lightmap_unwrap_callback = xatlas_mesh_lightmap_unwrap_callback;
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}
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void unregister_xatlas_unwrap_types() {
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}
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