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Remove buffer copies for gltf indices

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Directly access the values from the buffer instead
Fixes #894
This commit is contained in:
Sascha Willems 2021-10-24 12:07:01 +02:00
parent d72ff3c8d5
commit 6f723ea1e0
3 changed files with 13 additions and 22 deletions
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13
examples/gltfloading/gltfloading.cpp
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@ -1,7 +1,7 @@
/*
* Vulkan Example - glTF scene loading and rendering
*
* Copyright (C) 2020 by Sascha Willems - www.saschawillems.de
* Copyright (C) 2020-2021 by Sascha Willems - www.saschawillems.de
*
* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
*/
@ -163,7 +163,7 @@ public:
// Load texture from image buffer
images[i].texture.fromBuffer(buffer, bufferSize, VK_FORMAT_R8G8B8A8_UNORM, glTFImage.width, glTFImage.height, vulkanDevice, copyQueue);
if (deleteBuffer) {
delete buffer;
delete[] buffer;
}
}
}
@ -280,24 +280,21 @@ public:
// glTF supports different component types of indices
switch (accessor.componentType) {
case TINYGLTF_PARAMETER_TYPE_UNSIGNED_INT: {
uint32_t* buf = new uint32_t[accessor.count];
memcpy(buf, &buffer.data[accessor.byteOffset + bufferView.byteOffset], accessor.count * sizeof(uint32_t));
const uint32_t* buf = reinterpret_cast<const uint32_t*>(&buffer.data[accessor.byteOffset + bufferView.byteOffset]);
for (size_t index = 0; index < accessor.count; index++) {
indexBuffer.push_back(buf[index] + vertexStart);
}
break;
}
case TINYGLTF_PARAMETER_TYPE_UNSIGNED_SHORT: {
uint16_t* buf = new uint16_t[accessor.count];
memcpy(buf, &buffer.data[accessor.byteOffset + bufferView.byteOffset], accessor.count * sizeof(uint16_t));
const uint16_t* buf = reinterpret_cast<const uint16_t*>(&buffer.data[accessor.byteOffset + bufferView.byteOffset]);
for (size_t index = 0; index < accessor.count; index++) {
indexBuffer.push_back(buf[index] + vertexStart);
}
break;
}
case TINYGLTF_PARAMETER_TYPE_UNSIGNED_BYTE: {
uint8_t* buf = new uint8_t[accessor.count];
memcpy(buf, &buffer.data[accessor.byteOffset + bufferView.byteOffset], accessor.count * sizeof(uint8_t));
const uint8_t* buf = reinterpret_cast<const uint8_t*>(&buffer.data[accessor.byteOffset + bufferView.byteOffset]);
for (size_t index = 0; index < accessor.count; index++) {
indexBuffer.push_back(buf[index] + vertexStart);
}