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#include "model.h"
static honey_mesh assimp_to_honey_mesh(struct aiMesh* mesh, struct aiScene* scene) {
unsigned int vertex_step = 6;
bool mesh_has_uvs = false;
unsigned int n_vertices = mesh->mNumVertices;
if (mesh->mTextureCoords[0]) {
mesh_has_uvs = true;
vertex_step = 8;
}
float* vertices = malloc(sizeof(float) * vertex_step * n_vertices);
for (int i=0; i<n_vertices; i++) {
int j = i*vertex_step;
/* positions */
vertices[j+0] = mesh->mVertices[i].x;
vertices[j+1] = mesh->mVertices[i].y;
vertices[j+2] = mesh->mVertices[i].z;
/* normals */
vertices[j+3] = mesh->mNormals[i].x;
vertices[j+4] = mesh->mNormals[i].y;
vertices[j+5] = mesh->mNormals[i].z;
/* uvs? */
if (mesh_has_uvs) {
vertices[j+6] = mesh->mTextureCoords[0][i].x;
vertices[j+7] = mesh->mTextureCoords[0][i].y;
}
}
unsigned int n_indices = mesh->mNumFaces*3;
unsigned int* indices = malloc(sizeof(unsigned int) * n_indices);
for (int i=0; i<mesh->mNumFaces; i++) {
int j = 3*i;
struct aiFace face = mesh->mFaces[i];
indices[j+0] = face.mIndices[0];
indices[j+1] = face.mIndices[1];
indices[j+2] = face.mIndices[2];
}
honey_mesh result;
if (mesh_has_uvs) {
unsigned int n_attributes = 3;
unsigned int attribute_sizes[] = { 3, 3, 2 };
honey_mesh_new(&result,
vertices, n_vertices,
n_attributes, attribute_sizes,
indices, n_indices);
}
else {
unsigned int n_attributes = 2;
unsigned int attribute_sizes[] = { 3, 3 };
honey_mesh_new(&result,
vertices, n_vertices,
n_attributes, attribute_sizes,
indices, n_indices);
}
free(vertices);
free(indices);
return result;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
static void process_assimp_node(honey_model* model, struct aiNode* node, struct aiScene* scene) {
for (int i=0; i<node->mNumMeshes; i++) {
struct aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];
model->meshes[model->n_meshes] = assimp_to_honey_mesh(mesh, scene);
model->n_meshes++;
}
for (int i=0; i<node->mNumChildren; i++) {
process_assimp_node(model, node->mChildren[i], scene);
}
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
honey_result honey_model_load(honey_model* model,
char* path) {
model->n_meshes = 0;
struct aiScene* scene = aiImportFile(path,
aiProcess_Triangulate |
aiProcess_FlipUVs);
if (scene == NULL) {
honey_error_set_string1(path);
return HONEY_FILE_READ_ERROR;
}
if (scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE ||
scene->mRootNode == NULL) {
honey_error_set_string1(path);
return HONEY_MODEL_LOAD_ERROR;
}
process_assimp_node(model, scene->mRootNode, scene);
return HONEY_OK;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_model_draw(honey_model* model, honey_shader shader) {
for (int i=0; i<model->n_meshes; i++) {
honey_mesh_draw(model->meshes[i], shader);
}
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_model_delete(honey_model* model) {
for (int i=0; i<model->n_meshes; i++) {
honey_mesh_delete(model->meshes[i]);
}
}
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