diff options
author | sanine-a <sanine.not@pm.me> | 2020-11-29 15:16:42 -0600 |
---|---|---|
committer | sanine-a <sanine.not@pm.me> | 2020-11-29 15:16:42 -0600 |
commit | 140666204191b218b72274d8d14921c89a6631fd (patch) | |
tree | 8436c81dda007e934f6b5cadd41789c677306b44 /src/mesh/mesh.c | |
parent | 146d708c67172a05a62f944b16fdcb0dccc4713d (diff) |
refactor: eliminate src subdirectories for honey files
Diffstat (limited to 'src/mesh/mesh.c')
-rw-r--r-- | src/mesh/mesh.c | 232 |
1 files changed, 0 insertions, 232 deletions
diff --git a/src/mesh/mesh.c b/src/mesh/mesh.c deleted file mode 100644 index 68e39d7..0000000 --- a/src/mesh/mesh.c +++ /dev/null @@ -1,232 +0,0 @@ -#include "mesh.h" - -static int honey_mesh_lua_draw(lua_State* L) -{ - honey_mesh* mesh; - int shader; - honey_lua_parse_arguments(L, 2, - HONEY_USERDATA, &mesh, - HONEY_INTEGER, &shader); - honey_mesh_draw(*mesh, shader); - return 0; -} - -static int honey_mesh_lua_delete(lua_State* L) -{ - honey_mesh* mesh; - honey_lua_parse_arguments(L, 1, HONEY_USERDATA, &mesh); - honey_mesh_delete(*mesh); - return 0; -} - -void honey_setup_mesh(lua_State* L) -{ - honey_lua_element mesh_elements[] = { - { "load", HONEY_FUNCTION, { .function = honey_mesh_load } }, - { "draw", HONEY_FUNCTION, { .function = honey_mesh_lua_draw } }, - { "delete", HONEY_FUNCTION, { .function = honey_mesh_lua_delete } }, - }; - - honey_lua_create_table(L, mesh_elements, 2); -} - -/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ - -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_nodes_recursively(lua_State* L, - struct aiScene* scene, - struct aiNode* node, - int* n_meshes) -{ - for (int i=0; i<node->mNumMeshes; i++) { - honey_mesh* mesh = lua_newuserdata(L, sizeof(honey_mesh)); - struct aiMesh* assimp_mesh = scene->mMeshes[node->mMeshes[i]]; - *mesh = assimp_to_honey_mesh(assimp_mesh, scene); - lua_rawseti(L, -2, *n_meshes); - (*n_meshes)++; - } - - for (int i=0; i<node->mNumChildren; i++) { - process_nodes_recursively(L, scene, node->mChildren[i], n_meshes); - } -} - -/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ - -int honey_mesh_load(lua_State* L) -{ - char* filename; - honey_lua_parse_arguments(L, 1, HONEY_STRING, &filename); - - int n_meshes = 1; - - struct aiScene* scene = aiImportFile(filename, - aiProcess_Triangulate | - aiProcess_FlipUVs); - if (scene == NULL) { - char* error; - honey_format_string(&error, "could not open file '%s'", filename); - lua_pushstring(L, error); - free(error); - lua_error(L); - } - - if (scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE || - scene->mRootNode == NULL) { - char* error; - honey_format_string(&error, "could not read mesh(es) in '%s'", filename); - lua_pushstring(L, error); - free(error); - lua_error(L); - } - - lua_createtable(L, 0, 0); - - process_nodes_recursively(L, scene, scene->mRootNode, &n_meshes); - - return 1; -} - -/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ - -honey_result honey_mesh_new(honey_mesh* mesh, - float* vertices, - unsigned int n_vertices, - unsigned int n_attributes, - unsigned int* attribute_sizes, - unsigned int* indices, - unsigned int n_indices) { - if (vertices == NULL || n_vertices == 0) { - return HONEY_MESH_BAD_VERTEX_DATA; - } - if (indices == NULL || n_indices == 0) { - return HONEY_MESH_BAD_INDEX_DATA; - } - - unsigned int vertex_size = 0; - for (int i=0; i<n_attributes; i++) { - vertex_size += attribute_sizes[i]; - } - - (*mesh).n_vertices = n_vertices; - (*mesh).n_indices = n_indices; - - glGenVertexArrays(1, &((*mesh).vertex_array)); - glGenBuffers(1, &((*mesh).vertex_buffer)); - glGenBuffers(1, &((*mesh).element_buffer)); - - glBindVertexArray((*mesh).vertex_array); - - glBindBuffer(GL_ARRAY_BUFFER, (*mesh).vertex_buffer); - glBufferData(GL_ARRAY_BUFFER, - vertex_size * n_vertices * sizeof(float), - vertices, GL_STATIC_DRAW); - - glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, (*mesh).element_buffer); - glBufferData(GL_ELEMENT_ARRAY_BUFFER, - n_indices * sizeof(unsigned int), - indices, GL_STATIC_DRAW); - - /* set up vertex attributes */ - unsigned int offset = 0; - for (int i=0; i<n_attributes; i++) { - glEnableVertexAttribArray(i); - glVertexAttribPointer(i, - attribute_sizes[i], - GL_FLOAT, - GL_FALSE, - vertex_size*sizeof(float), - (void*) (offset*sizeof(float))); - offset += attribute_sizes[i]; - } - - glBindVertexArray(0); - - return HONEY_OK; -} - -/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ - -void honey_mesh_draw(honey_mesh mesh, int shader) { - glUseProgram(shader); - - glBindVertexArray(mesh.vertex_array); - glDrawElements(GL_TRIANGLES, mesh.n_indices, GL_UNSIGNED_INT, 0); - glBindVertexArray(0); -} - -/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ - -void honey_mesh_delete(honey_mesh mesh) { - glDeleteVertexArrays(1, &(mesh.vertex_array)); - glDeleteBuffers(1, &(mesh.vertex_buffer)); - glDeleteBuffers(1, &(mesh.element_buffer)); -} |