basically chunk loading

src/asset/assettype.h

@@ -10,6 +10,7 @@
 #include "type/assetalphaimage.h"
 #include "type/assetlanguage.h"
 #include "type/assetmap.h"
+#include "type/assetchunk.h"
 #include <zip.h>
 
 typedef enum {
@@ -19,6 +20,7 @@ typedef enum {
   ASSET_TYPE_ALPHA_IMAGE,
   ASSET_TYPE_LANGUAGE,
   ASSET_TYPE_MAP,
+  ASSET_TYPE_CHUNK,
 
   ASSET_TYPE_COUNT,
 } assettype_t;
@@ -73,5 +75,11 @@ static const assettypedef_t ASSET_TYPE_DEFINITIONS[ASSET_TYPE_COUNT] = {
     .loadStrategy = ASSET_LOAD_STRAT_ENTIRE,
     .dataSize = sizeof(assetmap_t),
     .entire = assetMapLoad
+  },
+
+  [ASSET_TYPE_CHUNK] = {
+    .header = "DCF",
+    .loadStrategy = ASSET_LOAD_STRAT_CUSTOM,
+    .custom = assetChunkLoad
   }
 };

src/asset/type/CMakeLists.txt

@@ -10,4 +10,5 @@ target_sources(${DUSK_TARGET_NAME}
     assetpaletteimage.c
     assetlanguage.c
     assetmap.c
+    assetchunk.c
 )

src/asset/type/assetchunk.c

@@ -0,0 +1,122 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "asset/asset.h"
+#include "assert/assert.h"
+
+#pragma pack(push, 1)
+typedef struct {
+  uint32_t tileCount;
+  uint8_t modelCount;
+} assetchunkheader_t;
+#pragma pack(pop)
+
+#pragma pack(push, 1)
+typedef struct {
+  tile_t tile;
+} assetchunktiledata_t;
+#pragma pack(pop)
+
+#pragma pack(push, 1)
+typedef struct {
+  uint32_t vertexCount;
+} assetchunkmodelheader_t;
+#pragma pack(pop)
+
+errorret_t assetChunkLoad(assetcustom_t custom) {
+  assertNotNull(custom.output, "Output pointer cannot be NULL");
+  assertNotNull(custom.zipFile, "Zip file pointer cannot be NULL");
+
+  chunk_t *chunk = (chunk_t *)custom.output;
+
+  // Read header
+  assetchunkheader_t header;
+  size_t bytesRead = zip_fread(
+    custom.zipFile, &header, sizeof(assetchunkheader_t)
+  );
+  if(bytesRead != sizeof(assetchunkheader_t)) {
+    zip_fclose(custom.zipFile);
+    errorThrow("Failed to read chunk asset header.");
+  }
+
+  if(header.tileCount != CHUNK_TILE_COUNT) {
+    zip_fclose(custom.zipFile);
+    errorThrow(
+      "Chunk asset has invalid tile count: %d (expected %d).",
+      header.tileCount,
+      CHUNK_TILE_COUNT
+    );
+  }
+
+  if(header.modelCount > CHUNK_MESH_COUNT_MAX) {
+    zip_fclose(custom.zipFile);
+    errorThrow(
+      "Chunk asset has too many models: %d (max %d).",
+      header.modelCount,
+      CHUNK_MESH_COUNT_MAX
+    );
+  }
+
+  chunk->meshCount = header.modelCount;
+
+  // Read tile data
+  bytesRead = zip_fread(
+    custom.zipFile,
+    chunk->tiles,
+    sizeof(assetchunktiledata_t) * header.tileCount
+  );
+  if(bytesRead != sizeof(assetchunktiledata_t) * header.tileCount) {
+    zip_fclose(custom.zipFile);
+    errorThrow("Failed to read chunk tile data.");
+  }
+
+  // For each model...
+  uint32_t vertexIndex = 0;
+  for(uint8_t i = 0; i < header.modelCount; i++) {
+    assetchunkmodelheader_t modelHeader;
+    bytesRead = zip_fread(
+      custom.zipFile, &modelHeader, sizeof(assetchunkmodelheader_t)
+    );
+    if(bytesRead != sizeof(assetchunkmodelheader_t)) {
+      zip_fclose(custom.zipFile);
+      errorThrow("Failed to read chunk model header.");
+    }
+
+    if(
+      vertexIndex + modelHeader.vertexCount >
+      CHUNK_VERTEX_COUNT_MAX
+    ) {
+      zip_fclose(custom.zipFile);
+      errorThrow("Chunk model vertex count exceeds maximum.");
+    }
+    
+    // Read vertex data.
+    bytesRead = zip_fread(
+      custom.zipFile,
+      &chunk->vertices[vertexIndex],
+      sizeof(meshvertex_t) * modelHeader.vertexCount
+    );
+    if(bytesRead != sizeof(meshvertex_t) * modelHeader.vertexCount) {
+      zip_fclose(custom.zipFile);
+      errorThrow("Failed to read chunk model vertex data.");
+    }
+
+
+    // Init the mesh
+    mesh_t *mesh = &chunk->meshes[i];
+    meshInit(
+      mesh,
+      MESH_PRIMITIVE_TRIANGLES,
+      modelHeader.vertexCount,
+      &chunk->vertices[vertexIndex]
+    );
+
+    vertexIndex += modelHeader.vertexCount;
+  }
+
+  errorOk();
+}

src/asset/type/assetchunk.h

@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "error/error.h"
+#include "rpg/world/chunk.h"
+
+typedef struct assetcustom_s assetcustom_t;
+
+/**
+ * Handles loading of chunk data from a chunk asset file.
+ * 
+ * @param custom The custom asset loading parameters.
+ * @return An error code.
+ */
+errorret_t assetChunkLoad(assetcustom_t custom);