[BROKEN] This compiles if we use fastgltf 0.9.0, but it says Error::UnsupportedVersion for the file. Earlier versions can't compile because either simdjson has code errors, or the .a/.so is missing important functions.

vk_engine.cpp

@@ -14,7 +14,7 @@
 #define VMA_IMPLEMENTATION
 #include "vk_mem_alloc.h"
 
-constexpr bool bUseValidationLayers = true;
+constexpr bool bUseValidationLayers = false;
 
 VulkanEngine* loadedEngine = nullptr;
 
@@ -202,6 +202,7 @@ void VulkanEngine::draw_geometry(VkCommandBuffer cmd)
 
   vkCmdDraw(cmd, 3, 1, 0, 0);
 
+  // draw rectangle
   vkCmdBindPipeline(cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, _meshPipeline);
 
   GPUDrawPushConstants push_constants{
@@ -215,6 +216,30 @@ void VulkanEngine::draw_geometry(VkCommandBuffer cmd)
 
   vkCmdDrawIndexed(cmd, 6, 1, 0, 0, 0);
 
+
+  // draw monkey
+  size_t model_idx = 2; // 0 cube; 1 sphere; 2 monkey
+
+  push_constants.vertexBuffer = testMeshes[model_idx]->meshBuffers.vertexBufferAddress;
+
+  vkCmdPushConstants(cmd,
+      _meshPipelineLayout,
+      VK_SHADER_STAGE_VERTEX_BIT,
+      0,
+      sizeof(GPUDrawPushConstants),
+      &push_constants);
+
+  vkCmdBindIndexBuffer(cmd,
+      testMeshes[model_idx]->meshBuffers.indexBuffer.buffer,
+      0,
+      VK_INDEX_TYPE_UINT32);
+
+  vkCmdDrawIndexed(cmd,
+      testMeshes[model_idx]->surfaces[0].count,
+      1, 
+      testMeshes[model_idx]->surfaces[0].startIndex,
+      0, 0);
+
   vkCmdEndRendering(cmd);
 }
 
@@ -711,7 +736,6 @@ void VulkanEngine::destroy_buffer(const AllocatedBuffer& buffer)
   vmaDestroyBuffer(_allocator, buffer.buffer, buffer.allocation);
 }
 
-
 GPUMeshBuffers VulkanEngine::uploadMesh(std::span<uint32_t> indices, std::span<Vertex> vertices)
 {
   const size_t vertexBufferSize = vertices.size() * sizeof(Vertex);
@@ -796,6 +820,11 @@ void VulkanEngine::init_default_data() {
 
   rectangle = uploadMesh(rect_indices, rect_vertices);
 
+  auto basicmesh = loadGltfMeshes(this, "basicmesh.glb");
+  assert(basicmesh != std::nullopt && "Failed to load basicmesh.glb");
+
+  testMeshes = *basicmesh;
+
   _mainDeletionQueue.push_function([&](){
     destroy_buffer(rectangle.indexBuffer);
     destroy_buffer(rectangle.vertexBuffer);