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Simplified glTF buffer code

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Added Android build files
This commit is contained in:
Sascha Willems 2022-01-22 10:03:39 +01:00
parent aad5a7dd81
commit 704aeec6b0
5 changed files with 200 additions and 28 deletions
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46
examples/vertexattributes/vertexattributes.cpp
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@ -54,34 +54,25 @@ void VulkanExample::loadSceneNode(const tinygltf::Node& inputNode, const tinyglt
const float* tangentsBuffer = nullptr;
size_t vertexCount = 0;
// Get buffer data for vertex positions
if (glTFPrimitive.attributes.find("POSITION") != glTFPrimitive.attributes.end()) {
const tinygltf::Accessor& accessor = input.accessors[glTFPrimitive.attributes.find("POSITION")->second];
const tinygltf::BufferView& view = input.bufferViews[accessor.bufferView];
positionBuffer = reinterpret_cast<const float*>(&(input.buffers[view.buffer].data[accessor.byteOffset + view.byteOffset]));
vertexCount = accessor.count;
}
// Get buffer data for vertex normals
if (glTFPrimitive.attributes.find("NORMAL") != glTFPrimitive.attributes.end()) {
const tinygltf::Accessor& accessor = input.accessors[glTFPrimitive.attributes.find("NORMAL")->second];
const tinygltf::BufferView& view = input.bufferViews[accessor.bufferView];
normalsBuffer = reinterpret_cast<const float*>(&(input.buffers[view.buffer].data[accessor.byteOffset + view.byteOffset]));
}
// Get buffer data for vertex texture coordinates
// glTF supports multiple sets, we only load the first one
if (glTFPrimitive.attributes.find("TEXCOORD_0") != glTFPrimitive.attributes.end()) {
const tinygltf::Accessor& accessor = input.accessors[glTFPrimitive.attributes.find("TEXCOORD_0")->second];
const tinygltf::BufferView& view = input.bufferViews[accessor.bufferView];
texCoordsBuffer = reinterpret_cast<const float*>(&(input.buffers[view.buffer].data[accessor.byteOffset + view.byteOffset]));
}
// POI: This sample uses normal mapping, so we also need to load the tangents from the glTF file
if (glTFPrimitive.attributes.find("TANGENT") != glTFPrimitive.attributes.end()) {
const tinygltf::Accessor& accessor = input.accessors[glTFPrimitive.attributes.find("TANGENT")->second];
const tinygltf::BufferView& view = input.bufferViews[accessor.bufferView];
tangentsBuffer = reinterpret_cast<const float*>(&(input.buffers[view.buffer].data[accessor.byteOffset + view.byteOffset]));
}
// Anonymous functions to simplify buffer view access
auto getBuffer = [glTFPrimitive, input, &vertexCount](const std::string attributeName, const float* &bufferTarget) {
if (glTFPrimitive.attributes.find(attributeName) != glTFPrimitive.attributes.end()) {
const tinygltf::Accessor& accessor = input.accessors[glTFPrimitive.attributes.find(attributeName)->second];
const tinygltf::BufferView& view = input.bufferViews[accessor.bufferView];
bufferTarget = reinterpret_cast<const float*>(&(input.buffers[view.buffer].data[accessor.byteOffset + view.byteOffset]));
if (attributeName == "POSITION") {
vertexCount = accessor.count;
}
}
};
// Append data to model's vertex buffer
// Get buffer pointers to the vertex attributes used in this sample
getBuffer("POSITION", positionBuffer);
getBuffer("NORMAL", normalsBuffer);
getBuffer("TEXCOORD_0", texCoordsBuffer);
getBuffer("TANGENT", tangentsBuffer);
// Append attributes to the vertex buffers
for (size_t v = 0; v < vertexCount; v++) {
// Append interleaved attributes
@ -97,7 +88,6 @@ void VulkanExample::loadSceneNode(const tinygltf::Node& inputNode, const tinyglt
vertexAttributeBuffers.normal.push_back(glm::normalize(glm::vec3(normalsBuffer ? glm::make_vec3(&normalsBuffer[v * 3]) : glm::vec3(0.0f))));
vertexAttributeBuffers.tangent.push_back(tangentsBuffer ? glm::make_vec4(&tangentsBuffer[v * 4]) : glm::vec4(0.0f));
vertexAttributeBuffers.uv.push_back(texCoordsBuffer ? glm::make_vec2(&texCoordsBuffer[v * 2]) : glm::vec3(0.0f));
}
// Indices