Entity does not own mesh.

2026-04-13 09:40:40 -05:00
parent d02673e04a
commit 2b9ee8f721
8 changed files with 40 additions and 189 deletions
@@ -1,122 +0,0 @@
-/**
- * Copyright (c) 2026 Dominic Masters
- *
- * This software is released under the MIT License.
- * https://opensource.org/licenses/MIT
- */
-
-#include "assetmeshloader.h"
-#include "assert/assert.h"
-#include "util/memory.h"
-#define FAST_OBJ_IMPLEMENTATION
-#include "fast_obj.h"
-
-// Wraps assetfile_t for fast_obj callbacks. Only the primary OBJ file is
-// opened through the ZIP; returning NULL for any secondary path (e.g. .mtl)
-// causes fast_obj to skip material loading, which is fine for our use case.
-static void* meshFileOpen(const char *path, void *user_data) {
-  assetfile_t *file = (assetfile_t *)user_data;
-  if(file->zipFile != NULL) return NULL;
-  errorret_t ret = assetFileOpen(file);
-  if(ret.code != ERROR_OK) return NULL;
-  return file;
-}
-
-static void meshFileClose(void *handle, void *user_data) {
-  if(handle == NULL) return;
-  assetfile_t *file = (assetfile_t *)handle;
-  errorCatch(assetFileClose(file));
-}
-
-static size_t meshFileRead(void *handle, void *dst, size_t bytes, void *user_data) {
-  if(handle == NULL) return 0;
-  assetfile_t *file = (assetfile_t *)handle;
-  errorret_t ret = assetFileRead(file, dst, bytes);
-  if(ret.code != ERROR_OK) return 0;
-  return (size_t)file->lastRead;
-}
-
-static unsigned long meshFileSize(void *handle, void *user_data) {
-  if(handle == NULL) return 0;
-  assetfile_t *file = (assetfile_t *)handle;
-  return (unsigned long)file->size;
-}
-
-errorret_t assetMeshLoader(assetfile_t *file) {
-  assertNotNull(file, "Asset file cannot be NULL.");
-  assertNotNull(file->output, "Asset file output cannot be NULL.");
-
-  fastObjCallbacks callbacks = {
-    .file_open  = meshFileOpen,
-    .file_close = meshFileClose,
-    .file_read  = meshFileRead,
-    .file_size  = meshFileSize,
-  };
-
-  fastObjMesh *obj = fast_obj_read_with_callbacks(file->filename, &callbacks, file);
-  if(obj == NULL) {
-    errorThrow("Failed to parse OBJ: %s", file->filename);
-  }
-
-  // Count output vertices, triangulating any polygons via fan decomposition.
-  int32_t vertexCount = 0;
-  for(unsigned int i = 0; i < obj->face_count; i++) {
-    if(obj->face_vertices[i] >= 3) {
-      vertexCount += (int32_t)(obj->face_vertices[i] - 2) * 3;
-    }
-  }
-
-  if(vertexCount == 0) {
-    fast_obj_destroy(obj);
-    errorThrow("OBJ has no valid faces: %s", file->filename);
-  }
-
-  meshvertex_t *vertices = (meshvertex_t *)memoryAllocate(
-    sizeof(meshvertex_t) * vertexCount
-  );
-  memoryZero(vertices, sizeof(meshvertex_t) * vertexCount);
-
-  int32_t vi = 0;
-  fastObjIndex *idx = obj->indices;
-  for(unsigned int fi = 0; fi < obj->face_count; fi++) {
-    unsigned int fv = obj->face_vertices[fi];
-    // Fan triangulation: anchor at idx[0], triangle (0, j, j+1).
-    for(unsigned int j = 1; j + 1 < fv; j++) {
-      fastObjIndex corners[3] = { idx[0], idx[j], idx[j + 1] };
-      for(int c = 0; c < 3; c++) {
-        vertices[vi].color = COLOR_WHITE_4B;
-
-        unsigned int p = corners[c].p;
-        if(p > 0 && p < obj->position_count) {
-          vertices[vi].pos[0] = obj->positions[p * 3 + 0];
-          vertices[vi].pos[1] = obj->positions[p * 3 + 1];
-          vertices[vi].pos[2] = obj->positions[p * 3 + 2];
-        }
-
-        unsigned int t = corners[c].t;
-        if(t > 0 && t < obj->texcoord_count) {
-          vertices[vi].uv[0] = obj->texcoords[t * 2 + 0];
-          vertices[vi].uv[1] = obj->texcoords[t * 2 + 1];
-        }
-
-        vi++;
-      }
-    }
-    idx += fv;
-  }
-
-  fast_obj_destroy(obj);
-
-  errorret_t ret = meshInit(
-    (mesh_t *)file->output,
-    MESH_PRIMITIVE_TYPE_TRIANGLES,
-    vertexCount,
-    vertices
-  );
-  memoryFree(vertices);
-  return ret;
-}
-
-errorret_t assetMeshLoad(const char_t *path, mesh_t *out) {
-  return assetLoad(path, assetMeshLoader, NULL, out);
-}