A

Signed-off-by: Slendi <slendi@socopon.com>

meson.build

@@ -60,6 +60,17 @@ add_project_arguments(
 		'-Wno-implicit-int-float-conversion',
 		'-Wno-implicit-float-conversion',
 		'-Wno-c++98-compat',
+		# Thanks fastgltf
+		'-Wno-ctad-maybe-unsupported',
+		'-Wno-switch-default',
+		'-Wno-nrvo',
+		'-Wno-shadow-field-in-constructor',
+		'-Wno-deprecated-copy-with-dtor',
+		'-Wno-double-promotion',
+		'-Wno-weak-vtables',
+		'-Wno-switch-enum',
+		'-Wno-sign-conversion',
+		'-Wno-documentation',
 	],
 	language : 'cpp'
 )
@@ -99,6 +110,7 @@ exe = executable('vr-compositor',
 		'src/DescriptorLayoutBuilder.cpp',
 		'src/DescriptorAllocator.cpp',
 		'src/GraphicsPipelineBuilder.cpp',
+		'src/Loader.cpp',
 		'src/VulkanRenderer.cpp',
 		'src/Application.cpp',
 	],

src/Application.h

@@ -10,7 +10,7 @@
 
 namespace Lunar {
 
-class VulkanRenderer;
+struct VulkanRenderer;
 
 struct Application {
 	Application();

src/Loader.cpp

@@ -0,0 +1,201 @@
+#include "Loader.h"
+
+#include <fastgltf/core.hpp>
+#include <fastgltf/tools.hpp>
+#include <fastgltf/util.hpp>
+
+#include "VulkanRenderer.h"
+
+namespace fastgltf {
+template<>
+struct ElementTraits<smath::Vec4>
+    : ElementTraitsBase<smath::Vec4, AccessorType::Vec4, float> { };
+template<>
+struct ElementTraits<smath::Vec3>
+    : ElementTraitsBase<smath::Vec3, AccessorType::Vec3, float> { };
+template<>
+struct ElementTraits<smath::Vec2>
+    : ElementTraitsBase<smath::Vec2, AccessorType::Vec2, float> { };
+}
+
+#ifndef __cpp_lib_format_path
+
+#	include <filesystem>
+#	include <format>
+#	include <string>
+#	include <type_traits>
+
+template<class CharT>
+struct std::formatter<std::filesystem::path, CharT>
+    : std::formatter<std::basic_string<CharT>, CharT> {
+	template<class FormatContext>
+	auto format(std::filesystem::path const &p, FormatContext &ctx) const
+	{
+		std::basic_string<CharT> s;
+
+		if constexpr (std::is_same_v<CharT, char>) {
+			s = p.generic_string();
+		} else if constexpr (std::is_same_v<CharT, wchar_t>) {
+			s = p.generic_wstring();
+		}
+#	if defined(__cpp_lib_char8_t)
+		else if constexpr (std::is_same_v<CharT, char8_t>) {
+			s = p.generic_u8string();
+		}
+#	endif
+		else if constexpr (std::is_same_v<CharT, char16_t>) {
+			s = p.generic_u16string();
+		} else if constexpr (std::is_same_v<CharT, char32_t>) {
+			s = p.generic_u32string();
+		}
+
+		return std::formatter<std::basic_string<CharT>, CharT>::format(s, ctx);
+	}
+};
+
+namespace Lunar {
+
+auto Mesh::load_gltf_meshes(
+    VulkanRenderer &renderer, std::filesystem::path const path)
+    -> std::optional<std::vector<std::shared_ptr<Mesh>>>
+{
+	renderer.logger().debug("Loading GLTF from file: {}", path);
+
+	auto data = fastgltf::GltfDataBuffer::FromPath(path);
+	if (data.error() != fastgltf::Error::None) {
+		renderer.logger().err("Failed to open glTF file: {} (error {})", path,
+		    fastgltf::to_underlying(data.error()));
+		return {};
+	}
+
+	constexpr auto gltfOptions { fastgltf::Options::LoadExternalBuffers };
+
+	fastgltf::Parser parser;
+
+	auto load { parser.loadGltf(data.get(), path.parent_path(), gltfOptions) };
+	if (load.error() != fastgltf::Error::None) {
+		renderer.logger().err(
+		    "Failed to load glTF: {}", fastgltf::to_underlying(load.error()));
+		return {};
+	}
+	fastgltf::Asset gltf { std::move(load.get()) };
+
+	std::vector<std::shared_ptr<Mesh>> meshes;
+
+	std::vector<uint32_t> indices;
+	std::vector<Vertex> vertices;
+	for (auto &mesh : gltf.meshes) {
+		Mesh new_mesh;
+
+		new_mesh.name = mesh.name;
+
+		indices.clear();
+		vertices.clear();
+
+		for (auto &&p : mesh.primitives) {
+			Surface new_surface;
+			new_surface.start_index = static_cast<uint32_t>(indices.size());
+			new_surface.count = static_cast<uint32_t>(
+			    gltf.accessors[p.indicesAccessor.value()].count);
+
+			size_t initial_vertex = vertices.size();
+
+			{ // Indices
+				auto &accessor = gltf.accessors[p.indicesAccessor.value()];
+				indices.reserve(indices.size() + accessor.count);
+				fastgltf::iterateAccessor<std::uint32_t>(
+				    gltf, accessor, [&](std::uint32_t idx) {
+					    indices.emplace_back(idx + initial_vertex);
+				    });
+			}
+
+			{ // Vertex positions
+				auto &accessor = gltf.accessors[p.findAttribute("POSITION")
+				        ->accessorIndex];
+
+				for (auto pos :
+				    fastgltf::iterateAccessor<smath::Vec3>(gltf, accessor)) {
+					Vertex v {
+						.position = pos,
+						.u = 0,
+						.normal = { 0, 0, 0 },
+						.v = 0,
+						.color = { 1.0f, 1.0f, 1.0f, 1.0f },
+					};
+					vertices.emplace_back(v);
+				}
+			}
+
+			if (auto attr = p.findAttribute("NORMAL")) { // Normals
+				auto &accessor = gltf.accessors[attr->accessorIndex];
+				size_t local_index = 0;
+				for (auto normal :
+				    fastgltf::iterateAccessor<smath::Vec3>(gltf, accessor)) {
+					vertices[initial_vertex + local_index].normal = normal;
+					local_index++;
+				}
+			}
+
+			if (auto attr = p.findAttribute("TEXCOORD_0")) { // UVs
+				auto &accessor = gltf.accessors[attr->accessorIndex];
+				size_t local_index = 0;
+				for (auto uv :
+				    fastgltf::iterateAccessor<smath::Vec2>(gltf, accessor)) {
+					uv.unpack(vertices[initial_vertex + local_index].u,
+					    vertices[initial_vertex + local_index].v);
+					local_index++;
+				}
+			}
+
+			if (auto attr = p.findAttribute("COLOR_0")) { // Colors
+				auto &accessor = gltf.accessors[attr->accessorIndex];
+				size_t local_index = 0;
+
+				switch (accessor.type) {
+				case fastgltf::AccessorType::Vec3: {
+					for (auto c3 : fastgltf::iterateAccessor<smath::Vec3>(
+					         gltf, accessor)) {
+						auto &dst
+						    = vertices[initial_vertex + local_index].color;
+						dst = { c3.x(), c3.y(), c3.z(), 1.0f };
+						++local_index;
+					}
+					break;
+				}
+				case fastgltf::AccessorType::Vec4: {
+					for (auto c4 : fastgltf::iterateAccessor<smath::Vec4>(
+					         gltf, accessor)) {
+						vertices[initial_vertex + local_index].color = c4;
+						++local_index;
+					}
+					break;
+				}
+				default:
+					renderer.logger().warn(
+					    "Unsupported COLOR_0 accessor type ({}) on mesh '{}'",
+					    static_cast<int>(accessor.type), new_mesh.name);
+					break;
+				}
+			}
+
+			constexpr bool OVERRIDE_COLORS = true;
+			if (OVERRIDE_COLORS) {
+				for (auto &vtx : vertices) {
+					vtx.color = smath::Vec4(vtx.normal, 1.f);
+				}
+			}
+
+			new_mesh.surfaces.emplace_back(new_surface);
+		}
+
+		new_mesh.mesh_buffers = renderer.upload_mesh(indices, vertices);
+
+		meshes.emplace_back(std::make_shared<Mesh>(std::move(new_mesh)));
+	}
+
+	return meshes;
+}
+
+#endif // __cpp_lib_format_path
+
+} // namespace Lunar

src/Loader.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <cstdint>
+#include <filesystem>
+#include <optional>
+#include <string>
+#include <vector>
+
+#include "Types.h"
+
+namespace Lunar {
+
+struct VulkanRenderer;
+
+struct Mesh {
+	struct Surface {
+		uint32_t start_index;
+		uint32_t count;
+	};
+
+	std::string name;
+	std::vector<Surface> surfaces;
+	GPUMeshBuffers mesh_buffers;
+
+	static auto load_gltf_meshes(
+	    VulkanRenderer &renderer, std::filesystem::path const path)
+	    -> std::optional<std::vector<std::shared_ptr<Mesh>>>;
+};
+
+} // namespace Lunar

src/Types.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <smath.hpp>
+#include <vk_mem_alloc.h>
+#include <vulkan/vulkan_core.h>
+
+#include "DeletionQueue.h"
+
+namespace Lunar {
+
+struct AllocatedImage {
+	VkImage image;
+	VkImageView image_view;
+	VmaAllocation allocation;
+	VkExtent3D extent;
+	VkFormat format;
+};
+
+struct AllocatedBuffer {
+	VkBuffer buffer;
+	VmaAllocation allocation;
+	VmaAllocationInfo info;
+};
+
+struct FrameData {
+	VkCommandPool command_pool;
+	VkCommandBuffer main_command_buffer;
+	VkSemaphore swapchain_semaphore;
+	VkFence render_fence;
+
+	DeletionQueue deletion_queue;
+};
+
+struct Vertex {
+	smath::Vec3 position;
+	float u;
+	smath::Vec3 normal;
+	float v;
+	smath::Vec4 color;
+};
+
+struct GPUMeshBuffers {
+	AllocatedBuffer index_buffer, vertex_buffer;
+	VkDeviceAddress vertex_buffer_address;
+};
+
+} // namespace Lunar

src/VulkanRenderer.cpp

@@ -151,7 +151,8 @@ auto VulkanRenderer::vk_init() -> void
 	features_13.pNext = nullptr;
 	features_13.synchronization2 = VK_TRUE;
 	features_13.dynamicRendering = VK_TRUE;
-	VkPhysicalDeviceBufferDeviceAddressFeatures buffer_device_address_features {};
+	VkPhysicalDeviceBufferDeviceAddressFeatures
+	    buffer_device_address_features {};
 	buffer_device_address_features.sType
 	    = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_BUFFER_DEVICE_ADDRESS_FEATURES;
 	buffer_device_address_features.bufferDeviceAddress = VK_TRUE;
@@ -587,7 +588,15 @@ auto VulkanRenderer::default_data_init() -> void
 
 	m_vk.rectangle = upload_mesh(rect_indices, rect_vertices);
 
+	m_vk.test_meshes
+	    = Mesh::load_gltf_meshes(*this, "assets/basicmesh.glb").value();
+
 	m_vk.deletion_queue.emplace([&]() {
+		for (auto &mesh : m_vk.test_meshes) {
+			destroy_buffer(mesh->mesh_buffers.index_buffer);
+			destroy_buffer(mesh->mesh_buffers.vertex_buffer);
+		}
+
 		destroy_buffer(m_vk.rectangle.index_buffer);
 		destroy_buffer(m_vk.rectangle.vertex_buffer);
 	});
@@ -763,6 +772,25 @@ auto VulkanRenderer::draw_geometry(VkCommandBuffer cmd) -> void
 
 	vkCmdDrawIndexed(cmd, 6, 1, 0, 0, 0);
 
+	push_constants.vertex_buffer
+	    = m_vk.test_meshes[2]->mesh_buffers.vertex_buffer_address;
+
+	auto const view { smath::translate(smath::Vec3 { 0, 0, -0.1 }) };
+	auto projection { smath::matrix_perspective(smath::deg(70.0f),
+		static_cast<float>(m_vk.draw_extent.width)
+		    / static_cast<float>(m_vk.draw_extent.height),
+		10000.0f, 0.1f) };
+	push_constants.world_matrix = projection * view;
+
+	vkCmdPushConstants(cmd, m_vk.mesh_pipeline_layout,
+	    VK_SHADER_STAGE_VERTEX_BIT, 0, sizeof(push_constants), &push_constants);
+	vkCmdBindIndexBuffer(cmd,
+	    m_vk.test_meshes[2]->mesh_buffers.index_buffer.buffer, 0,
+	    VK_INDEX_TYPE_UINT32);
+
+	vkCmdDrawIndexed(cmd, m_vk.test_meshes[2]->surfaces[0].count, 1,
+	    m_vk.test_meshes[2]->surfaces[0].start_index, 0, 0);
+
 	vkCmdEndRendering(cmd);
 }
 

src/VulkanRenderer.h

@@ -11,46 +11,12 @@
 
 #include "DeletionQueue.h"
 #include "DescriptorAllocator.h"
+#include "Loader.h"
 #include "Logger.h"
+#include "Types.h"
 
 namespace Lunar {
 
-struct AllocatedImage {
-	VkImage image;
-	VkImageView image_view;
-	VmaAllocation allocation;
-	VkExtent3D extent;
-	VkFormat format;
-};
-
-struct AllocatedBuffer {
-	VkBuffer buffer;
-	VmaAllocation allocation;
-	VmaAllocationInfo info;
-};
-
-struct FrameData {
-	VkCommandPool command_pool;
-	VkCommandBuffer main_command_buffer;
-	VkSemaphore swapchain_semaphore;
-	VkFence render_fence;
-
-	DeletionQueue deletion_queue;
-};
-
-struct Vertex {
-	smath::Vec3 position;
-	float uv_x;
-	smath::Vec3 normal;
-	float uv_y;
-	smath::Vec4 color;
-};
-
-struct GPUMeshBuffers {
-	AllocatedBuffer index_buffer, vertex_buffer;
-	VkDeviceAddress vertex_buffer_address;
-};
-
 struct GPUDrawPushConstants {
 	smath::Mat4 world_matrix;
 	VkDeviceAddress vertex_buffer;
@@ -58,8 +24,7 @@ struct GPUDrawPushConstants {
 
 constexpr unsigned FRAME_OVERLAP = 2;
 
-class VulkanRenderer {
+struct VulkanRenderer {
-public:
 	VulkanRenderer(SDL_Window *window, Logger &logger);
 	~VulkanRenderer();
 
@@ -68,6 +33,10 @@ public:
 
 	auto immediate_submit(std::function<void(VkCommandBuffer cmd)> &&function)
 	    -> void;
+	auto upload_mesh(std::span<uint32_t> indices, std::span<Vertex> vertices)
+	    -> GPUMeshBuffers;
+
+	auto logger() const -> Logger & { return m_logger; }
 
 private:
 	auto vk_init() -> void;
@@ -96,8 +65,6 @@ private:
 	auto create_buffer(size_t alloc_size, VkBufferUsageFlags usage,
 	    VmaMemoryUsage memory_usage) -> AllocatedBuffer;
 	auto destroy_buffer(AllocatedBuffer &buffer) -> void;
-	auto upload_mesh(std::span<uint32_t> indices, std::span<Vertex> vertices)
-	    -> GPUMeshBuffers;
 
 	struct {
 		vkb::Instance instance;
@@ -154,6 +121,8 @@ private:
 		VkCommandPool imm_command_pool {};
 
 		uint64_t frame_number { 0 };
+
+		std::vector<std::shared_ptr<Mesh>> test_meshes;
 	} m_vk;
 
 	SDL_Window *m_window { nullptr };