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https://github.com/bailwillharr/engine.git
synced 2024-09-21 04:51:18 +00:00
get gltf mesh loading working
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620525758d
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b947cc68e0
@ -13,6 +13,14 @@ namespace tg = tinygltf;
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namespace engine::util {
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template <typename T>
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struct Attribute {
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const uint8_t* buffer;
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size_t offset;
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size_t stride;
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const T& operator[](size_t i) { return *reinterpret_cast<const T*>(&buffer[offset + stride * i]); }
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};
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static void DecomposeTransform(glm::mat4 transform, glm::vec3& pos, glm::quat& rot, glm::vec3& scale)
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{
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// get position
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@ -98,7 +106,7 @@ engine::Entity LoadGLTF(Scene& scene, const std::string& path, bool isStatic)
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// find the image first
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// use missing texture image by default
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textures.emplace_back(scene.app()->GetResource<Texture>("builtin.white"));
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if (texture.source == -1) continue;
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gfx::SamplerInfo samplerInfo{};
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@ -109,36 +117,36 @@ engine::Entity LoadGLTF(Scene& scene, const std::string& path, bool isStatic)
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if (texture.sampler != -1) {
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const tg::Sampler& sampler = model.samplers.at(texture.sampler);
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switch (sampler.minFilter) {
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case TINYGLTF_TEXTURE_FILTER_NEAREST:
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case TINYGLTF_TEXTURE_FILTER_NEAREST_MIPMAP_LINEAR:
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samplerInfo.minify = gfx::Filter::kNearest;
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samplerInfo.mipmap = gfx::Filter::kLinear;
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break;
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case TINYGLTF_TEXTURE_FILTER_NEAREST_MIPMAP_NEAREST:
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samplerInfo.minify = gfx::Filter::kNearest;
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samplerInfo.mipmap = gfx::Filter::kNearest;
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break;
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case TINYGLTF_TEXTURE_FILTER_LINEAR:
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case TINYGLTF_TEXTURE_FILTER_LINEAR_MIPMAP_LINEAR:
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samplerInfo.minify = gfx::Filter::kLinear;
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samplerInfo.mipmap = gfx::Filter::kLinear;
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break;
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case TINYGLTF_TEXTURE_FILTER_LINEAR_MIPMAP_NEAREST:
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samplerInfo.minify = gfx::Filter::kLinear;
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samplerInfo.mipmap = gfx::Filter::kNearest;
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break;
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default:
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break;
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case TINYGLTF_TEXTURE_FILTER_NEAREST:
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case TINYGLTF_TEXTURE_FILTER_NEAREST_MIPMAP_LINEAR:
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samplerInfo.minify = gfx::Filter::kNearest;
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samplerInfo.mipmap = gfx::Filter::kLinear;
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break;
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case TINYGLTF_TEXTURE_FILTER_NEAREST_MIPMAP_NEAREST:
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samplerInfo.minify = gfx::Filter::kNearest;
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samplerInfo.mipmap = gfx::Filter::kNearest;
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break;
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case TINYGLTF_TEXTURE_FILTER_LINEAR:
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case TINYGLTF_TEXTURE_FILTER_LINEAR_MIPMAP_LINEAR:
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samplerInfo.minify = gfx::Filter::kLinear;
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samplerInfo.mipmap = gfx::Filter::kLinear;
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break;
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case TINYGLTF_TEXTURE_FILTER_LINEAR_MIPMAP_NEAREST:
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samplerInfo.minify = gfx::Filter::kLinear;
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samplerInfo.mipmap = gfx::Filter::kNearest;
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break;
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default:
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break;
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}
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switch (sampler.magFilter) {
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case TINYGLTF_TEXTURE_FILTER_NEAREST:
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samplerInfo.magnify = gfx::Filter::kNearest;
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break;
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case TINYGLTF_TEXTURE_FILTER_LINEAR:
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samplerInfo.magnify = gfx::Filter::kLinear;
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break;
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default:
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break;
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case TINYGLTF_TEXTURE_FILTER_NEAREST:
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samplerInfo.magnify = gfx::Filter::kNearest;
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break;
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case TINYGLTF_TEXTURE_FILTER_LINEAR:
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samplerInfo.magnify = gfx::Filter::kLinear;
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break;
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default:
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break;
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}
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}
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// use aniso if min filter is LINEAR_MIPMAP_LINEAR
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@ -147,8 +155,7 @@ engine::Entity LoadGLTF(Scene& scene, const std::string& path, bool isStatic)
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const tg::Image& image = model.images.at(texture.source);
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if (image.as_is == false && image.bits == 8 && image.component == 4 && image.pixel_type == TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE) {
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// create texture on GPU
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textures.back() = std::make_shared<Texture>(scene.app()->renderer(), image.image.data(), image.width,
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image.height, samplerInfo, true);
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textures.back() = std::make_shared<Texture>(scene.app()->renderer(), image.image.data(), image.width, image.height, samplerInfo, true);
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}
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}
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@ -163,16 +170,143 @@ engine::Entity LoadGLTF(Scene& scene, const std::string& path, bool isStatic)
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/* load all meshes found in model */
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std::vector<std::shared_ptr<Mesh>> meshes{};
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meshes.reserve(model.meshes.size());
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struct EnginePrimitive {
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std::shared_ptr<Mesh> mesh;
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std::shared_ptr<Material> material;
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};
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std::vector<std::vector<EnginePrimitive>> primitive_arrays{}; // sub-array is all primitives for a given mesh
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primitive_arrays.reserve(model.meshes.size());
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for (const tg::Mesh& mesh : model.meshes) {
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// placeholder mesh for now
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auto& primitive_array = primitive_arrays.emplace_back();
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for (const tg::Primitive& primitive : mesh.primitives) {
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if (primitive.attributes.contains("POSITION")) {
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const tg::Accessor& pos_accessor = model.accessors.at(primitive.attributes.at("POSITION"));
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const size_t num_vertices = pos_accessor.count;
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// these checks are probably unneccesary assuming a valid glTF file
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// if (pos_accessor.componentType != TINYGLTF_COMPONENT_TYPE_FLOAT) throw std::runtime_error("Position att. must be float!");
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// if (pos_accessor.type != 3) throw std::runtime_error("Position att. dim. must be 3!");
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const tg::BufferView& pos_bufferview = model.bufferViews.at(pos_accessor.bufferView);
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const tg::Buffer& pos_buffer = model.buffers.at(pos_bufferview.buffer);
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Attribute<glm::vec3> positions{.buffer = pos_buffer.data.data(),
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.offset = pos_accessor.byteOffset + pos_bufferview.byteOffset,
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.stride = static_cast<size_t>(pos_accessor.ByteStride(pos_bufferview))};
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Attribute<glm::vec3> normals{};
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if (primitive.attributes.contains("NORMAL")) {
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const tg::Accessor& norm_accessor = model.accessors.at(primitive.attributes.at("NORMAL"));
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const tg::BufferView& norm_bufferview = model.bufferViews.at(norm_accessor.bufferView);
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const tg::Buffer& norm_buffer = model.buffers.at(norm_bufferview.buffer);
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normals.buffer = norm_buffer.data.data();
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normals.offset = norm_accessor.byteOffset + norm_bufferview.byteOffset;
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normals.stride = static_cast<size_t>(norm_accessor.ByteStride(norm_bufferview));
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}
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else {
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// TODO: generate flat normals
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throw std::runtime_error(std::string("No normals found in primitive from ") + mesh.name);
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}
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Attribute<glm::vec4> tangents{};
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if (primitive.attributes.contains("TANGENT")) {
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const tg::Accessor& tang_accessor = model.accessors.at(primitive.attributes.at("TANGENT"));
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const tg::BufferView& tang_bufferview = model.bufferViews.at(tang_accessor.bufferView);
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const tg::Buffer& tang_buffer = model.buffers.at(tang_bufferview.buffer);
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tangents.buffer = tang_buffer.data.data();
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tangents.offset = tang_accessor.byteOffset + tang_bufferview.byteOffset;
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tangents.stride = static_cast<size_t>(tang_accessor.ByteStride(tang_bufferview));
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}
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else {
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// TODO: use MikkTSpace to generate tangents
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throw std::runtime_error(std::string("No tangents found in primitive from ") + mesh.name);
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}
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// UV0
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Attribute<glm::vec2> uv0s{};
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if (primitive.attributes.contains("TEXCOORD_0")) {
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const tg::Accessor& uv0_accessor = model.accessors.at(primitive.attributes.at("TEXCOORD_0"));
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const tg::BufferView& uv0_bufferview = model.bufferViews.at(uv0_accessor.bufferView);
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const tg::Buffer& uv0_buffer = model.buffers.at(uv0_bufferview.buffer);
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uv0s.buffer = uv0_buffer.data.data();
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uv0s.offset = uv0_accessor.byteOffset + uv0_bufferview.byteOffset;
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uv0s.stride = static_cast<size_t>(uv0_accessor.ByteStride(uv0_bufferview));
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}
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else {
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// TODO: Possibly create a shader variant that doesn't need UVs?
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throw std::runtime_error(std::string("No TEXCOORD_0 found in primitive from ") + mesh.name);
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}
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// Indices
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const tg::Accessor& indices_accessor = model.accessors.at(primitive.indices);
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const tg::BufferView& indices_bufferview = model.bufferViews.at(indices_accessor.bufferView);
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const tg::Buffer& indices_buffer = model.buffers.at(indices_bufferview.buffer);
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const uint8_t* const indices_data_start = indices_buffer.data.data() + indices_accessor.byteOffset + indices_bufferview.byteOffset;
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const size_t num_indices = indices_accessor.count;
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std::vector<uint32_t> indices;
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indices.reserve(num_indices);
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if (indices_accessor.componentType == TINYGLTF_COMPONENT_TYPE_UNSIGNED_BYTE) {
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for (size_t i = 0; i < num_indices; ++i) {
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indices.push_back(*reinterpret_cast<const uint8_t*>(&indices_data_start[i * 1]));
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}
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}
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else if (indices_accessor.componentType == TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT) {
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for (size_t i = 0; i < num_indices; ++i) {
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indices.push_back(*reinterpret_cast<const uint16_t*>(&indices_data_start[i * 2]));
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}
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}
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else if (indices_accessor.componentType == TINYGLTF_COMPONENT_TYPE_UNSIGNED_INT) {
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for (size_t i = 0; i < num_indices; ++i) {
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indices.push_back(*reinterpret_cast<const uint32_t*>(&indices_data_start[i * 4]));
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}
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}
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else {
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throw std::runtime_error(std::string("Invalid index buffer in primtive from: ") + mesh.name);
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}
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// combine vertices into one array
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std::vector<Vertex> vertices;
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vertices.reserve(num_vertices);
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for (size_t i = 0; i < num_vertices; ++i) {
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Vertex v;
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v.pos = positions[i];
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v.norm = normals[i];
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v.tangent = tangents[i];
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v.uv = uv0s[i];
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vertices.push_back(v);
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}
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// generate mesh on GPU
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std::shared_ptr<Mesh> engine_mesh = std::make_shared<Mesh>(scene.app()->renderer()->GetDevice(), vertices, indices);
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// get material
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std::shared_ptr<Material> engine_material = nullptr;
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if (primitive.material != -1) {
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engine_material = materials.at(primitive.material);
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}
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else {
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engine_material = scene.app()->GetResource<Material>("builtin.default");
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}
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primitive_array.emplace_back(engine_mesh, engine_material);
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}
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else {
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// skip primitive's rendering
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continue;
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}
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}
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}
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const Entity parent =
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scene.CreateEntity("test_node", 0, glm::vec3{}, glm::quat{glm::one_over_root_two<float>(), glm::one_over_root_two<float>(), 0.0f, 0.0f});
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auto ren = scene.AddComponent<MeshRenderableComponent>(parent);
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ren->material = primitive_arrays.at(0).at(0).material;
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ren->mesh = primitive_arrays.at(0).at(0).mesh;
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return parent;
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}
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@ -196,12 +196,12 @@ void PlayGame(GameSettings settings)
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auto teapot = engine::util::LoadGLTF(*scene2, app.GetResourcePath("models/teapot_with_tangents.glb"));
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scene2->GetComponent<engine::TransformComponent>(teapot)->scale *= 10.0f;
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auto teapot2 = engine::util::LoadGLTF(*scene2, app.GetResourcePath("models/teapot.glb"));
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scene2->GetComponent<engine::TransformComponent>(teapot2)->scale *= 10.0f;
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scene2->GetComponent<engine::TransformComponent>(teapot2)->position.y += 5.0f;
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scene2->GetComponent<engine::TransformComponent>(teapot2)->rotation = glm::angleAxis(glm::pi<float>(), glm::vec3{ 0.0f, 0.0f, 1.0f });
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scene2->GetComponent<engine::TransformComponent>(teapot2)->rotation *= glm::angleAxis(glm::half_pi<float>(), glm::vec3{1.0f, 0.0f, 0.0f});
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auto walls = engine::util::LoadGLTF(*scene2, app.GetResourcePath("models/walls.glb"));
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//auto teapot2 = engine::util::LoadGLTF(*scene2, app.GetResourcePath("models/teapot.glb"));
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//scene2->GetComponent<engine::TransformComponent>(teapot2)->scale *= 10.0f;
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//scene2->GetComponent<engine::TransformComponent>(teapot2)->position.y += 5.0f;
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//scene2->GetComponent<engine::TransformComponent>(teapot2)->rotation = glm::angleAxis(glm::pi<float>(), glm::vec3{ 0.0f, 0.0f, 1.0f });
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//scene2->GetComponent<engine::TransformComponent>(teapot2)->rotation *= glm::angleAxis(glm::half_pi<float>(), glm::vec3{1.0f, 0.0f, 0.0f});
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//auto walls = engine::util::LoadGLTF(*scene2, app.GetResourcePath("models/walls.glb"));
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}
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my_scene->GetSystem<CameraControllerSystem>()->next_scene_ = scene2;
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