testing tinygltf API

examples/render_groups/main.cpp

@@ -180,10 +180,10 @@ main()
 	rs->arena = arenaInit();
 	rs->asset_list =
 		(render_asset*) arenaAllocateBlock(rs->arena, sizeof(render_asset));
+	// TODO: need to update render_asset->next somewhere
 
-	//mesh_group mg;
-	//meLoadFromFile(mg, "../data/blender/icosphere.gltf");
-	render_asset* rass = assetLoadFromFile("../data/blender/icosphere.gltf");
+	render_asset* rass =
+		assetLoadFromFile(rs->arena, "../data/blender/icosphere.gltf");
 
 	renShutdown(rs);
 	return 0;

include/asset.h

@@ -37,5 +37,5 @@ struct render_asset
 };
 
 render_asset*
-assetLoadFromFile(const char* filename);
+assetLoadFromFile(memory_arena* arena, const char* filename);
 

src/asset.cpp

@@ -7,22 +7,77 @@
 #include "tiny_gltf.h"
 
 #include "asset.h"
+#include "dumbLog.h"
 
+const char*
+getTargetStr(int target)
+{
+	switch (target) {
+		case 34962: return "GL_ARRAY_BUFFER";
+		case 34963: return "GL_ELEMENT_ARRAY_BUFFER";
+		default: return "UNKNOWN";
+	}
+}
 
+const char*
+getElementType(int type)
+{
+	switch (type) {
+		case 2: return "VEC2";
+		case 3: return "VEC3";
+		case 4: return "VEC4";
+		case 65: return "TINYGLTF_TYPE_SCALAR";
+		default: return "UNKNOWN";
+	}
+}
+
+const char*
+getComponentType(int componentType)
+{
+	switch (componentType) {
+		case 5123: return "TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT";
+		case 5124: return "TINYGLTF_COMPONENT_TYPE_INT";
+		case 5125: return "TINYGLTF_COMPONENT_TYPE_UNSIGNED_INT";
+		case 5126: return "TINYGLTF_COMPONENT_TYPE_FLOAT";
+		case 5130: return "TINYGLTF_COMPONENT_TYPE_DOUBLE";
+		default: return "UNKOWN"; }
+}
 render_asset*
-assetLoadFromFile(const char* filename)
+assetLoadFromFile(memory_arena* arena, const char* filename)
 {
 	tinygltf::Model model;
 	// TODO: see if there's any impact in creating a new context for each file
 	tinygltf::TinyGLTF gltf_ctx;
 	std::string err;
 	std::string warn;
-	bool ret = false;
 
-	ret = gltf_ctx.LoadASCIIFromFile(&model, &err, &warn, filename);
+	if (!gltf_ctx.LoadASCIIFromFile(&model, &err, &warn, filename)) {
+		LOG(Error) << "Error loading file: " << filename << "\n";
+		return nullptr;
+	}
 
+	uint buf_count = model.bufferViews.size();
+	render_asset* ra =
+		(render_asset*) arenaAllocateBlock(arena, sizeof(render_asset));
+	ra->meshes =
+		(mesh_asset*) arenaAllocateBlock(arena, buf_count * sizeof(mesh_asset));
 
+	for (uint i = 0; i < model.accessors.size(); i++) {
+		tinygltf::Accessor acc = model.accessors[i];
+		size_t bv_idx = acc.bufferView;
+		assert(bv_idx >= 0 && bv_idx < model.bufferViews.size());
+		tinygltf::BufferView bv = model.bufferViews[bv_idx];
 
+		LOG(Debug) << "-----------------------\n";
+		LOG(Debug) << "buf idx: " << i << "\n";
+		LOG(Debug) << "buf target: " << getTargetStr(bv.target) << "\n";
+		LOG(Debug) << "buf len: " << bv.byteLength << "\n";
+		LOG(Debug) << "buf offset: " << bv.byteOffset << "\n";
+		LOG(Debug) << "buf stride: " << bv.byteStride << "\n";
+		LOG(Debug) << "buf component type: "
+			<< getComponentType(acc.componentType) << "\n";
+		LOG(Debug) << "buf element type: " << getElementType(acc.type) << "\n";
+	}
 
-	return nullptr;
+	return ra;
 }