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Replaced gli with libktx for cubemap texture loading sample

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This commit is contained in:
Sascha Willems 2019-08-03 10:00:29 +02:00
parent 7e2bd36dfa
commit 40a16ac48a
2 changed files with 32 additions and 20 deletions
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50
examples/texturecubemap/texturecubemap.cpp
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@ -17,13 +17,13 @@
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <gli/gli.hpp>
#include <vulkan/vulkan.h>
#include "vulkanexamplebase.h"
#include "VulkanBuffer.hpp"
#include "VulkanTexture.hpp"
#include "VulkanModel.hpp"
#include <ktx.h>
#include <ktxvulkan.h>
#define ENABLE_VALIDATION false
@ -127,11 +127,16 @@ public:
void loadCubemap(std::string filename, VkFormat format, bool forceLinearTiling)
{
ktxResult result;
ktxTexture* ktxTexture;
#if defined(__ANDROID__)
// Textures are stored inside the apk on Android (compressed)
// So they need to be loaded via the asset manager
AAsset* asset = AAssetManager_open(androidApp->activity->assetManager, filename.c_str(), AASSET_MODE_STREAMING);
assert(asset);
if (!asset) {
vks::tools::exitFatal("Could not load texture from " + filename + "\n\nThe file may be part of the additional asset pack.\n\nRun \"download_assets.py\" in the repository root to download the latest version.", -1);
}
size_t size = AAsset_getLength(asset);
assert(size > 0);
@ -139,16 +144,23 @@ public:
AAsset_read(asset, textureData, size);
AAsset_close(asset);
gli::texture_cube texCube(gli::load((const char*)textureData, size));
result = ktxTexture_CreateFromMemory(textureData, size, KTX_TEXTURE_CREATE_LOAD_IMAGE_DATA_BIT, target);
free(textureData);
#else
gli::texture_cube texCube(gli::load(filename));
#endif
if (!vks::tools::fileExists(filename)) {
vks::tools::exitFatal("Could not load texture from " + filename + "\n\nThe file may be part of the additional asset pack.\n\nRun \"download_assets.py\" in the repository root to download the latest version.", -1);
}
result = ktxTexture_CreateFromNamedFile(filename.c_str(), KTX_TEXTURE_CREATE_LOAD_IMAGE_DATA_BIT, &ktxTexture);
#endif
assert(result == KTX_SUCCESS);
assert(!texCube.empty());
cubeMap.width = texCube.extent().x;
cubeMap.height = texCube.extent().y;
cubeMap.mipLevels = texCube.levels();
// Get properties required for using and upload texture data from the ktx texture object
cubeMap.width = ktxTexture->baseWidth;
cubeMap.height = ktxTexture->baseHeight;
cubeMap.mipLevels = ktxTexture->numLevels;
ktx_uint8_t *ktxTextureData = ktxTexture_GetData(ktxTexture);
ktx_size_t ktxTextureSize = ktxTexture_GetSize(ktxTexture);
VkMemoryAllocateInfo memAllocInfo = vks::initializers::memoryAllocateInfo();
VkMemoryRequirements memReqs;
@ -158,7 +170,7 @@ public:
VkDeviceMemory stagingMemory;
VkBufferCreateInfo bufferCreateInfo = vks::initializers::bufferCreateInfo();
bufferCreateInfo.size = texCube.size();
bufferCreateInfo.size = ktxTextureSize;
// This buffer is used as a transfer source for the buffer copy
bufferCreateInfo.usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT;
bufferCreateInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
@ -176,7 +188,7 @@ public:
// Copy texture data into staging buffer
uint8_t *data;
VK_CHECK_RESULT(vkMapMemory(device, stagingMemory, 0, memReqs.size, 0, (void **)&data));
memcpy(data, texCube.data(), texCube.size());
memcpy(data, ktxTextureData, ktxTextureSize);
vkUnmapMemory(device, stagingMemory);
// Create optimal tiled target image
@ -215,20 +227,19 @@ public:
{
for (uint32_t level = 0; level < cubeMap.mipLevels; level++)
{
// Calculate offset into staging buffer for the current mip level and face
ktx_size_t offset;
assert(ktxTexture_GetImageOffset(ktxTexture, level, 0, face, &offset) == KTX_SUCCESS);
VkBufferImageCopy bufferCopyRegion = {};
bufferCopyRegion.imageSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
bufferCopyRegion.imageSubresource.mipLevel = level;
bufferCopyRegion.imageSubresource.baseArrayLayer = face;
bufferCopyRegion.imageSubresource.layerCount = 1;
bufferCopyRegion.imageExtent.width = texCube[face][level].extent().x;
bufferCopyRegion.imageExtent.height = texCube[face][level].extent().y;
bufferCopyRegion.imageExtent.width = ktxTexture->baseWidth >> level;
bufferCopyRegion.imageExtent.height = ktxTexture->baseHeight >> level;
bufferCopyRegion.imageExtent.depth = 1;
bufferCopyRegion.bufferOffset = offset;
bufferCopyRegions.push_back(bufferCopyRegion);
// Increase offset into staging buffer for next level / face
offset += texCube[face][level].size();
}
}
@ -306,6 +317,7 @@ public:
// Clean up staging resources
vkFreeMemory(device, stagingMemory, nullptr);
vkDestroyBuffer(device, stagingBuffer, nullptr);
ktxTexture_Destroy(ktxTexture);
}
void loadTextures()