mirror of
https://github.com/bailwillharr/engine.git
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548 lines
26 KiB
C++
548 lines
26 KiB
C++
#include "util/gltf_loader.h"
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#include "log.h"
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#include "util/files.h"
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#include "libs/mikktspace.h"
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#include "libs/weldmesh.h"
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#include "libs/tiny_gltf.h"
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#include "components/mesh_renderable.h"
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#include <components/transform.h>
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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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pos.x = transform[3][0];
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pos.y = transform[3][1];
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pos.z = transform[3][2];
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// remove position from matrix
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transform[3][0] = 0.0f;
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transform[3][1] = 0.0f;
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transform[3][2] = 0.0f;
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// get scale
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scale.x = sqrtf(transform[0][0] * transform[0][0] + transform[0][1] * transform[0][1] + transform[0][2] * transform[0][2]);
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scale.y = sqrtf(transform[1][0] * transform[1][0] + transform[1][1] * transform[1][1] + transform[1][2] * transform[1][2]);
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scale.z = sqrtf(transform[2][0] * transform[2][0] + transform[2][1] * transform[2][1] + transform[2][2] * transform[2][2]);
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// remove scaling from matrix
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for (int row = 0; row < 3; row++) {
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transform[0][row] /= scale.x;
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transform[1][row] /= scale.y;
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transform[2][row] /= scale.z;
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}
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// get rotation
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rot = glm::quat_cast(transform);
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}
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static glm::mat4 MatFromDoubleArray(const std::vector<double>& arr)
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{
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glm::mat4 mat{};
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for (int i = 0; i < 4; ++i) {
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mat[i][0] = static_cast<float>(arr[static_cast<size_t>(i) * 4 + 0]);
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mat[i][1] = static_cast<float>(arr[static_cast<size_t>(i) * 4 + 1]);
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mat[i][2] = static_cast<float>(arr[static_cast<size_t>(i) * 4 + 2]);
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mat[i][3] = static_cast<float>(arr[static_cast<size_t>(i) * 4 + 3]);
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}
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return mat;
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}
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engine::Entity LoadGLTF(Scene& scene, const std::string& path, bool isStatic)
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{
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tg::TinyGLTF loader;
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tg::Model model;
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std::string err, warn;
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loader.SetParseStrictness(tg::ParseStrictness::Strict);
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const bool success = loader.LoadBinaryFromFile(&model, &err, &warn, path);
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if (!warn.empty()) {
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LOG_WARN("glTF Loader: {}", warn);
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}
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if (!err.empty()) {
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LOG_ERROR("glTF Loader: {}", err);
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}
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if (!success) {
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throw std::runtime_error("Failed to load glTF file!");
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}
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// test model loading
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if (model.scenes.size() < 1) {
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throw std::runtime_error("Need at least 1 scene");
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}
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int scene_index = 0;
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if (model.defaultScene != -1) scene_index = model.defaultScene;
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const tg::Scene& s = model.scenes.at(scene_index);
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/* load all textures found in the model */
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std::vector<std::shared_ptr<Texture>> textures{};
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textures.reserve(model.textures.size());
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for (const tg::Texture& texture : model.textures) {
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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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// default to trilinear filtering even if mipmaps are not specified
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samplerInfo.minify = gfx::Filter::kLinear;
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samplerInfo.magnify = gfx::Filter::kLinear;
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samplerInfo.mipmap = gfx::Filter::kLinear;
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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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}
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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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}
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}
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// use aniso if min filter is LINEAR_MIPMAP_LINEAR
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samplerInfo.anisotropic_filtering = (samplerInfo.minify == gfx::Filter::kLinear && samplerInfo.mipmap == gfx::Filter::kLinear);
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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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// TODO: somehow detect if the textue should be srgb or not
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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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/* load all materials found in model */
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// store some 1x1 colour textures as a hack to render solid colours
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struct Color {
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uint8_t r, g, b, a;
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Color(const double* doubles)
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{
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r = static_cast<uint8_t>(lround(doubles[0] * 255.0));
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g = static_cast<uint8_t>(lround(doubles[1] * 255.0));
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b = static_cast<uint8_t>(lround(doubles[2] * 255.0));
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a = static_cast<uint8_t>(lround(doubles[3] * 255.0));
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}
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};
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//std::unordered_map<Color, std::shared_ptr<Texture>> colour_textures;
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std::vector<std::shared_ptr<Material>> materials{};
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materials.reserve(model.materials.size());
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for (const tg::Material& material : model.materials) {
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if (material.alphaMode != "OPAQUE") {
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LOG_WARN("Material {} contains alphaMode {} which isn't supported yet", material.name, material.alphaMode);
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LOG_WARN("Material will be opaque");
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}
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if (material.doubleSided == true) {
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LOG_WARN("Material {} specifies double-sided mesh rendering which isn't supported yet", material.name);
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LOG_WARN("Material will be single-sided.");
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}
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if (material.emissiveTexture.index != -1 || material.emissiveFactor[0] != 0.0 || material.emissiveFactor[1] != 0.0 ||
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material.emissiveFactor[2] != 0.0) {
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LOG_WARN("Material {} contains an emissive texture or non-zero emissive factor. Emission is currently unsupported.", material.name);
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LOG_WARN("Material will be created without emission.");
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}
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if (material.occlusionTexture.index != -1) {
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LOG_WARN("Material {} contains an ambient occlusion texture which isn't supported yet.", material.name);
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LOG_WARN("Material will be created without an occlusion map.");
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}
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const auto& baseColorFactor4 = material.pbrMetallicRoughness.baseColorFactor;
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if (baseColorFactor4[0] != 1.0 || baseColorFactor4[1] != 1.0 || baseColorFactor4[2] != 1.0 || baseColorFactor4[3] != 1.0) {
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if (material.pbrMetallicRoughness.baseColorTexture.index == -1) {
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LOG_INFO("Making color texture!");
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throw std::runtime_error("TODO");
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// convert double colors to integers
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//Color col(baseColorFactor4.data());
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//if (colour_textures.contains(col)) {
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// }
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}
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else {
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LOG_WARN("Material {} contains a base color multiplier which isn't supported yet.", material.name);
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LOG_WARN("The material's base color texture will be used as-is.");
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}
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}
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if (material.pbrMetallicRoughness.metallicRoughnessTexture.index != -1) {
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LOG_WARN("Material {} contains a metallic-roughness texture which isn't supported yet.", material.name);
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LOG_WARN("This texture will be ignored.");
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}
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if (material.pbrMetallicRoughness.metallicFactor != 1.0) {
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LOG_WARN("Material {} contains a metallic factor != 1.0 which isn't supported yet.", material.name);
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LOG_WARN("Material will be created as fully metallic");
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}
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if (material.pbrMetallicRoughness.roughnessFactor != 1.0) {
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LOG_WARN("Material {} contains a roughness factor != 1.0 which isn't supported yet.", material.name);
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LOG_WARN("Material will be created as fully rough");
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}
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materials.emplace_back(std::make_shared<Material>(scene.app()->renderer(), scene.app()->GetResource<Shader>("builtin.fancy")));
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materials.back()->SetAlbedoTexture(scene.app()->GetResource<Texture>("builtin.white"));
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if (material.pbrMetallicRoughness.baseColorTexture.index != -1) {
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if (material.pbrMetallicRoughness.baseColorTexture.texCoord == 0) {
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materials.back()->SetAlbedoTexture(textures.at(material.pbrMetallicRoughness.baseColorTexture.index));
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}
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else {
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LOG_WARN("Material {} base color texture specifies a UV channel other than zero which is unsupported.");
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LOG_WARN("Material will be created with a white base color");
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}
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}
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materials.back()->SetNormalTexture(scene.app()->GetResource<Texture>("builtin.normal"));
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if (material.normalTexture.index != -1) {
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if (material.normalTexture.texCoord == 0) {
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materials.back()->SetNormalTexture(textures.at(material.normalTexture.index));
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}
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else {
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LOG_WARN("Material {} normal texture specifies a UV channel other than zero which is unsupported.");
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LOG_WARN("Material will be created with no normal map");
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}
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}
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}
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/* load all meshes found in model */
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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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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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bool generate_tangents = false; // generating tangents creates a new index list and therefore all attribute accessors must be reassigned
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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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generate_tangents = true;
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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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std::vector<Vertex> vertices;
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if (generate_tangents) {
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// generate tangents if they're not in the file
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struct MeshData {
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Attribute<glm::vec3>* positions;
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Attribute<glm::vec3>* normals;
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Attribute<glm::vec2>* uvs;
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const uint32_t* indices;
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size_t num_indices;
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std::vector<Vertex>* new_vertices;
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};
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MeshData meshData{};
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meshData.positions = &positions;
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meshData.normals = &normals;
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meshData.uvs = &uv0s;
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meshData.indices = indices.data();
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meshData.num_indices = num_indices;
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meshData.new_vertices = &vertices;
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vertices.resize(num_indices);
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SMikkTSpaceInterface mts_interface{};
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mts_interface.m_getNumFaces = [](const SMikkTSpaceContext* pContext) -> int {
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const MeshData* meshData = static_cast<const MeshData*>(pContext->m_pUserData);
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assert(meshData->num_indices % 3 == 0);
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return meshData->num_indices / 3;
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};
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mts_interface.m_getNumVerticesOfFace = [](const SMikkTSpaceContext*, const int) -> int { return 3; };
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mts_interface.m_getPosition = [](const SMikkTSpaceContext* pContext, float fvPosOut[], const int iFace, const int iVert) -> void {
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const MeshData* const meshData = static_cast<const MeshData*>(pContext->m_pUserData);
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const size_t i = iFace * 3 + iVert;
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assert(i < meshData->num_indices);
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const size_t vertex_index = meshData->indices[i];
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const glm::vec3 pos = meshData->positions->operator[](vertex_index);
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fvPosOut[0] = pos.x;
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fvPosOut[1] = pos.y;
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fvPosOut[2] = pos.z;
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};
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mts_interface.m_getNormal = [](const SMikkTSpaceContext* pContext, float fvNormOut[], const int iFace, const int iVert) -> void {
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const MeshData* const meshData = static_cast<const MeshData*>(pContext->m_pUserData);
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const size_t i = iFace * 3 + iVert;
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assert(i < meshData->num_indices);
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const size_t vertex_index = meshData->indices[i];
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const glm::vec3 norm = meshData->normals->operator[](vertex_index);
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fvNormOut[0] = norm.x;
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fvNormOut[1] = norm.y;
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fvNormOut[2] = norm.z;
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};
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mts_interface.m_getTexCoord = [](const SMikkTSpaceContext* pContext, float fvTexcOut[], const int iFace, const int iVert) -> void {
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const MeshData* const meshData = static_cast<const MeshData*>(pContext->m_pUserData);
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const size_t i = iFace * 3 + iVert;
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assert(i < meshData->num_indices);
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const size_t vertex_index = meshData->indices[i];
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const glm::vec2 uv = meshData->uvs->operator[](vertex_index);
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fvTexcOut[0] = uv.x;
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fvTexcOut[1] = uv.y;
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};
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mts_interface.m_setTSpaceBasic = [](const SMikkTSpaceContext* pContext, const float fvTangent[], const float fSign, const int iFace,
|
|
const int iVert) -> void {
|
|
MeshData* const meshData = static_cast<MeshData*>(pContext->m_pUserData);
|
|
const size_t i = iFace * 3 + iVert;
|
|
assert(i < meshData->num_indices);
|
|
const size_t vertex_index = meshData->indices[i];
|
|
|
|
Vertex& new_v = meshData->new_vertices->operator[](i);
|
|
|
|
new_v.pos = meshData->positions->operator[](vertex_index);
|
|
new_v.norm = meshData->normals->operator[](vertex_index);
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|
new_v.uv = meshData->uvs->operator[](vertex_index);
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|
new_v.tangent.x = fvTangent[0];
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|
new_v.tangent.y = fvTangent[1];
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|
new_v.tangent.z = fvTangent[2];
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|
new_v.tangent.w = fSign;
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|
};
|
|
SMikkTSpaceContext mts_context{};
|
|
mts_context.m_pInterface = &mts_interface;
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|
mts_context.m_pUserData = &meshData;
|
|
|
|
bool tan_result = genTangSpaceDefault(&mts_context);
|
|
if (tan_result == false) throw std::runtime_error("Failed to generate tangents!");
|
|
|
|
// regenerate indices as simple ones
|
|
indices.clear();
|
|
indices.reserve(meshData.new_vertices->size());
|
|
// temp generate simple indices
|
|
for (uint32_t i = 0; i < meshData.new_vertices->size(); ++i) {
|
|
indices.push_back(i);
|
|
}
|
|
}
|
|
else {
|
|
// combine vertices into one array
|
|
vertices.clear();
|
|
vertices.reserve(num_vertices);
|
|
for (size_t i = 0; i < num_vertices; ++i) {
|
|
Vertex v{.pos = positions[i], .norm = normals[i], .tangent = tangents[i], .uv = uv0s[i]};
|
|
vertices.push_back(v);
|
|
}
|
|
}
|
|
|
|
// generate mesh on GPU
|
|
std::shared_ptr<Mesh> engine_mesh = std::make_shared<Mesh>(scene.app()->renderer()->GetDevice(), vertices, indices);
|
|
|
|
// get material
|
|
std::shared_ptr<Material> engine_material = nullptr;
|
|
if (primitive.material != -1) {
|
|
engine_material = materials.at(primitive.material);
|
|
}
|
|
else {
|
|
engine_material = scene.app()->GetResource<Material>("builtin.default");
|
|
}
|
|
|
|
primitive_array.emplace_back(engine_mesh, engine_material);
|
|
}
|
|
else {
|
|
// skip primitive's rendering
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* now create the entities and traverse the glTF scene hierarchy */
|
|
const std::filesystem::path filePath(path);
|
|
const std::string name = filePath.stem().string();
|
|
|
|
// glTF uses the Y-up convention so the parent object must be rotated to Z-up
|
|
const Entity parent = scene.CreateEntity(name, 0, glm::vec3{}, glm::quat{glm::one_over_root_two<float>(), glm::one_over_root_two<float>(), 0.0f, 0.0f});
|
|
|
|
std::vector<Entity> entities(model.nodes.size(), 0);
|
|
std::function<void(Entity, const tg::Node&)> generateEntities = [&](Entity parent_entity, const tg::Node& node) -> void {
|
|
const Entity e = scene.CreateEntity(node.name.empty() ? "anode" : node.name, parent_entity);
|
|
|
|
// transform
|
|
auto t = scene.GetComponent<TransformComponent>(e);
|
|
t->position.x = 0.0f;
|
|
t->position.y = 0.0f;
|
|
t->position.z = 0.0f;
|
|
t->rotation.x = 0.0f;
|
|
t->rotation.y = 0.0f;
|
|
t->rotation.z = 0.0f;
|
|
t->rotation.w = 1.0f;
|
|
t->scale.x = 1.0f;
|
|
t->scale.y = 1.0f;
|
|
t->scale.z = 1.0f;
|
|
|
|
if (node.matrix.size() == 16) {
|
|
const glm::mat4 matrix = MatFromDoubleArray(node.matrix);
|
|
DecomposeTransform(matrix, t->position, t->rotation, t->scale);
|
|
}
|
|
else {
|
|
if (node.translation.size() == 3) {
|
|
t->position.x = static_cast<float>(node.translation[0]);
|
|
t->position.y = static_cast<float>(node.translation[1]);
|
|
t->position.z = static_cast<float>(node.translation[2]);
|
|
}
|
|
if (node.rotation.size() == 4) {
|
|
t->rotation.x = static_cast<float>(node.rotation[0]);
|
|
t->rotation.y = static_cast<float>(node.rotation[1]);
|
|
t->rotation.z = static_cast<float>(node.rotation[2]);
|
|
t->rotation.w = static_cast<float>(node.rotation[3]);
|
|
}
|
|
if (node.scale.size() == 3) {
|
|
t->scale.x = static_cast<float>(node.scale[0]);
|
|
t->scale.y = static_cast<float>(node.scale[1]);
|
|
t->scale.z = static_cast<float>(node.scale[2]);
|
|
}
|
|
}
|
|
|
|
// ignoring cameras
|
|
// ignoring skin
|
|
// ignoring weights
|
|
|
|
if (node.mesh != -1) {
|
|
const auto& primitives = primitive_arrays.at(node.mesh);
|
|
int i = 0;
|
|
for (const EnginePrimitive& prim : primitives) {
|
|
auto prim_entity = scene.CreateEntity(std::string("_mesh") + std::to_string(i), e);
|
|
auto meshren = scene.AddComponent<MeshRenderableComponent>(prim_entity);
|
|
meshren->mesh = prim.mesh;
|
|
meshren->material = prim.material;
|
|
++i;
|
|
}
|
|
}
|
|
|
|
for (int i : node.children) {
|
|
generateEntities(e, model.nodes.at(i));
|
|
}
|
|
};
|
|
|
|
for (int i : s.nodes) {
|
|
generateEntities(parent, model.nodes.at(i));
|
|
}
|
|
|
|
LOG_INFO("Loaded glTF model: {}", path);
|
|
|
|
return parent;
|
|
}
|
|
|
|
} // namespace engine::util
|