Asset manager refactor begin.

archive/asset/asset.c

@@ -0,0 +1,156 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "asset.h"
+#include "util/memory.h"
+#include "console/console.h"
+#include "util/string.h"
+#include "assert/assert.h"
+
+#define ASSET_ASSET_FILE "dusk.dsk"
+
+asset_t ASSET;
+
+errorret_t assetInit(void) {
+  memoryZero(&ASSET, sizeof(asset_t));
+
+  // Open zip file
+  char_t searchPath[FILENAME_MAX];
+  consolevar_t *var = consoleVarGet("sys_path");
+  const char_t *sysPath = var ? var->value : ".";
+  for(int32_t i = 0; i < ASSET_SEARCH_PATHS_COUNT; i++) {
+    sprintf(
+      searchPath,
+      ASSET_SEARCH_PATHS[i],
+      sysPath,
+      ASSET_ASSET_FILE
+    );
+
+    // Try open
+    ASSET.zip = zip_open(searchPath, ZIP_RDONLY, NULL);
+    if(ASSET.zip == NULL) continue;
+    consolePrint("Opened asset file: %s", searchPath);
+    break;
+  }
+  
+  // Did we open the asset?
+  if(ASSET.zip == NULL) errorThrow("Failed to open asset file.");
+
+  errorOk();
+}
+
+void assetLoad(
+  const char_t *filename,
+  void (*callback)(void* data),
+  void *data
+) {
+  assertNotNull(filename, "Filename cannot be NULL.");
+  assertTrue(strlen(filename) < ASSET_FILENAME_MAX, "Filename too long.");
+  assertTrue(strlen(filename) > 0, "Filename cannot be empty.");
+
+  assertTrue(
+    ASSET.state != ASSET_STATE_LOADING,
+    "Asset system is already loading an asset."
+  );
+
+  // Determine the asset map type we are expecting based on the extension.
+  const assetmap_t *expected = &ASSET_MAP[0];
+  do {
+    if(stringEndsWith(filename, expected->extension)) break;
+    expected++;
+  } while(expected->extension);
+  assertNotNull(expected->extension, "Unknown asset type.");
+  
+  // Pass off to the thread to begin loading.
+  ASSET.callback = callback;
+  ASSET.callbackData = data;
+  ASSET.errorState = ERROR_STATE_INIT;
+  ASSET.state = ASSET_STATE_LOADING;
+  stringCopy(ASSET.filename, filename, ASSET_FILENAME_MAX);
+  memoryZero(&ASSET.data, sizeof(ASSET.data));
+
+  // For the sake of testing I'm going to do blocking load, fun stuff.
+  zip_file_t *file = zip_fopen(ASSET.zip, filename, 0);
+  if(file == NULL) {
+    ASSET.state = ASSET_STATE_ERROR;
+    ASSET.error = errorCreate(
+      &ASSET.errorState,
+      "Failed to open asset: %s",
+      filename
+    );
+    if(ASSET.callback) ASSET.callback(ASSET.callbackData);
+    return;
+  }
+
+  printf("Loading asset: %s\n", filename);
+
+  // Determine length of the file (uncompressed)
+  struct zip_stat st;
+  if(zip_stat(ASSET.zip, filename, 0, &st) != 0) {
+    zip_fclose(file);
+    ASSET.state = ASSET_STATE_ERROR;
+    ASSET.error = errorCreate(
+      &ASSET.errorState,
+      "Failed to stat asset: %s",
+      filename
+    );
+    if(ASSET.callback) ASSET.callback(ASSET.callbackData);
+    return;
+  }
+
+  if(st.size > sizeof(ASSET.data.palette)) {
+    zip_fclose(file);
+    ASSET.state = ASSET_STATE_ERROR;
+    ASSET.error = errorCreate(
+      &ASSET.errorState,
+      "Asset size mismatch: %s (got %d, expected %d)",
+      filename,
+      (int)st.size,
+      (int)sizeof(ASSET.data.palette)
+    );
+    if(ASSET.callback) ASSET.callback(ASSET.callbackData);
+    return;
+  }
+
+  // Read entire file into the asset data.
+  zip_fread(file, &ASSET.data, st.size); 
+  zip_fclose(file);
+  ASSET.state = ASSET_STATE_LOADED;
+
+  if(memoryCompare(
+    ASSET.data.header, expected->header, ASSET_HEADER_LENGTH
+  ) != 0) {
+    ASSET.state = ASSET_STATE_ERROR;
+    ASSET.error = errorCreate(
+      &ASSET.errorState,
+      "Asset header mismatch: %s (got %c%c%c, expected %c%c%c)",
+      filename,
+      ASSET.data.header[0],
+      ASSET.data.header[1],
+      ASSET.data.header[2],
+      expected->header[0],
+      expected->header[1],
+      expected->header[2]
+    );
+    if(ASSET.callback) ASSET.callback(ASSET.callbackData);
+    return;
+  }
+
+  // Parse the asset.
+  assertNotNull(expected->parser, "Asset parser cannot be NULL.");
+  expected->parser();
+
+  printf("Loaded asset: %s\n", filename);
+  if(ASSET.callback) ASSET.callback(ASSET.callbackData);
+}
+
+void assetDispose(void) {
+  if(ASSET.zip != NULL) {
+    zip_close(ASSET.zip);
+    ASSET.zip = NULL;
+  }
+}