[#26] Some improvements to first mesh test project.

This commit fixes an issue where the indices of a vertex group would
always be handled as uint16_t regardless of what the IndexType was.

Additionally, the vertex attributes are now printed as well.

projects/first_mesh/src/main.cpp

@@ -21,23 +21,41 @@ int main(int argc, const char** argv) {
 		"points", "lines", "line loop", "line strip", "triangles",
 		"triangle strip", "triangle fan"
 	};
+	const char *primitive_types[] = {
+		"unknown", "position", "normal", "texcoord0"
+	};
 	printf("Mesh %s (%s) has %lu vertex group(s) and %lu material(s):\n",
 			mesh.name.c_str(), path, mesh.vertexGroups.size(),
 			mesh.materials.size());
 	for (size_t i = 0; i < mesh.vertexGroups.size(); i++) {
-		char *buf;
 		printf("--- vertex group %lu ---\n", i);
 		const auto &vg = mesh.vertexGroups[i];
 		printf("primitive mode: %d (%s)\n", vg.mode,
 				primitive_modes[vg.mode]);
-		printf("index buffer: %lu bytes for %lu indices (%p)\n",
-				vg.indexBuffer.data.size(), vg.numIndices,
-				vg.indexBuffer.data.data());
-		buf = (char*)vg.indexBuffer.data.data();
-		uint16_t *indices = (uint16_t*)buf;
+		printf("index buffer: %lu bytes for %lu indices ",
+				vg.indexBuffer.data.size(), vg.numIndices);
+		const auto itype = vg.indexBuffer.type;
+		printf("(%s @ %p)\n",
+				itype == vkcv::asset::UINT32 ? "UINT32" :
+				itype == vkcv::asset::UINT16 ? "UINT16" :
+				"UINT8", vg.indexBuffer.data.data());
 		printf("\tindices: ");
-		for (size_t j = 0; j < vg.numIndices; j++) {
-			printf("%u ", indices[j]);
+		const size_t n = vg.numIndices;
+		if (vg.indexBuffer.type == vkcv::asset::UINT32) {
+			uint32_t *idx = (uint32_t*)vg.indexBuffer.data.data();
+			for (size_t j = 0; j < n; j++) printf("%u ", idx[j]);
+		} else
+		if (vg.indexBuffer.type == vkcv::asset::UINT16) {
+			uint16_t *idx = (uint16_t*)vg.indexBuffer.data.data();
+			for (size_t j = 0; j < n; j++) printf("%u ", idx[j]);
+		} else
+		if (vg.indexBuffer.type == vkcv::asset::UINT8) {
+			uint8_t *idx = (uint8_t*)vg.indexBuffer.data.data();
+			for (size_t j = 0; j < n; j++) printf("%u ", idx[j]);
+		} else {
+			fprintf(stderr, "ERROR Invalid IndexType: %d\n",
+					vg.indexBuffer.type);
+			return 0;
 		}
 		printf("\n");
 		printf("vertex buffer: %lu bytes for %lu vertices with %lu "
@@ -45,6 +63,13 @@ int main(int argc, const char** argv) {
 				vg.vertexBuffer.data.size(), vg.numVertices,
 				vg.vertexBuffer.attributes.size(),
 				vg.vertexBuffer.data.data());
+		printf("attributes:\toffset\tlength\tstride\tcomponents\n");
+		for (const auto att : vg.vertexBuffer.attributes) {
+			printf("%11s\t%u\t%u\t%u\t%hhux%hu\n",
+					primitive_types[att.type],
+					att.offset, att.length, att.stride,
+					att.componentCount, att.componentType);
+		}
 	}
 	
 	return 0;