src/Vulkan/VkImageView.cpp - SwiftShader - Git at Google

 // Copyright 2018 The SwiftShader Authors. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //    http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 #include "VkImageView.hpp"

 #include "VkImage.hpp"
 #include "System/Math.hpp"

 #include <climits>

 namespace vk {

 VkComponentMapping ResolveIdentityMapping(VkComponentMapping mapping)
 {
 	return {
 		(mapping.r == VK_COMPONENT_SWIZZLE_IDENTITY) ? VK_COMPONENT_SWIZZLE_R : mapping.r,
 		(mapping.g == VK_COMPONENT_SWIZZLE_IDENTITY) ? VK_COMPONENT_SWIZZLE_G : mapping.g,
 		(mapping.b == VK_COMPONENT_SWIZZLE_IDENTITY) ? VK_COMPONENT_SWIZZLE_B : mapping.b,
 		(mapping.a == VK_COMPONENT_SWIZZLE_IDENTITY) ? VK_COMPONENT_SWIZZLE_A : mapping.a,
 	};
 }

 VkComponentMapping ResolveComponentMapping(VkComponentMapping mapping, vk::Format format)
 {
 	mapping = vk::ResolveIdentityMapping(mapping);

 	// Replace non-present components with zero/one swizzles so that the sampler
 	// will give us correct interactions between channel replacement and texel replacement,
 	// where we've had to invent new channels behind the app's back (eg transparent decompression
 	// of ETC2 RGB -> BGRA8)
 	VkComponentSwizzle table[] = {
 		VK_COMPONENT_SWIZZLE_IDENTITY,
 		VK_COMPONENT_SWIZZLE_ZERO,
 		VK_COMPONENT_SWIZZLE_ONE,
 		VK_COMPONENT_SWIZZLE_R,
 		format.componentCount() < 2 ? VK_COMPONENT_SWIZZLE_ZERO : VK_COMPONENT_SWIZZLE_G,
 		format.componentCount() < 3 ? VK_COMPONENT_SWIZZLE_ZERO : VK_COMPONENT_SWIZZLE_B,
 		format.componentCount() < 4 ? VK_COMPONENT_SWIZZLE_ONE : VK_COMPONENT_SWIZZLE_A,
 	};

 	return { table[mapping.r], table[mapping.g], table[mapping.b], table[mapping.a] };
 }

 VkImageSubresourceRange ResolveRemainingLevelsLayers(VkImageSubresourceRange range, const vk::Image *image)
 {
 	return {
 		range.aspectMask,
 		range.baseMipLevel,
 		(range.levelCount == VK_REMAINING_MIP_LEVELS) ? (image->getMipLevels() - range.baseMipLevel) : range.levelCount,
 		range.baseArrayLayer,
 		(range.layerCount == VK_REMAINING_ARRAY_LAYERS) ? (image->getArrayLayers() - range.baseArrayLayer) : range.layerCount,
 	};
 }

 Identifier::Identifier(const Image *image, VkImageViewType type, VkFormat fmt, VkComponentMapping mapping)
 {
 	imageViewType = type;
 	format = Format::mapTo8bit(fmt);
 	r = mapping.r;
 	g = mapping.g;
 	b = mapping.b;
 	a = mapping.a;
 }

 Identifier::Identifier(VkFormat fmt)
 {
 	static_assert(vk::VK_IMAGE_VIEW_TYPE_END_RANGE == 6, "VkImageViewType does not allow using 7 to indicate buffer view");
 	imageViewType = 7;  // Still fits in 3-bit field
 	format = Format::mapTo8bit(fmt);
 }

 ImageView::ImageView(const VkImageViewCreateInfo *pCreateInfo, void *mem, const vk::SamplerYcbcrConversion *ycbcrConversion)
     : image(vk::Cast(pCreateInfo->image))
     , viewType(pCreateInfo->viewType)
     , format(pCreateInfo->format)
     , components(ResolveComponentMapping(pCreateInfo->components, format))
     , subresourceRange(ResolveRemainingLevelsLayers(pCreateInfo->subresourceRange, image))
     , ycbcrConversion(ycbcrConversion)
     , id(image, viewType, format.getAspectFormat(subresourceRange.aspectMask), components)
 {
 }

 size_t ImageView::ComputeRequiredAllocationSize(const VkImageViewCreateInfo *pCreateInfo)
 {
 	return 0;
 }

 void ImageView::destroy(const VkAllocationCallbacks *pAllocator)
 {
 }

 // Vulkan 1.2 Table 8. Image and image view parameter compatibility requirements
 bool ImageView::imageTypesMatch(VkImageType imageType) const
 {
 	uint32_t imageArrayLayers = image->getArrayLayers();

 	switch(viewType)
 	{
 		case VK_IMAGE_VIEW_TYPE_1D:
 			return (imageType == VK_IMAGE_TYPE_1D) &&
 			       (subresourceRange.layerCount == 1);
 		case VK_IMAGE_VIEW_TYPE_1D_ARRAY:
 			return imageType == VK_IMAGE_TYPE_1D;
 		case VK_IMAGE_VIEW_TYPE_2D:
 			return ((imageType == VK_IMAGE_TYPE_2D) ||
 			        ((imageType == VK_IMAGE_TYPE_3D) &&
 			         (imageArrayLayers == 1))) &&
 			       (subresourceRange.layerCount == 1);
 		case VK_IMAGE_VIEW_TYPE_2D_ARRAY:
 			return (imageType == VK_IMAGE_TYPE_2D) ||
 			       ((imageType == VK_IMAGE_TYPE_3D) &&
 			        (imageArrayLayers == 1));
 		case VK_IMAGE_VIEW_TYPE_CUBE:
 			return image->isCube() &&
 			       (imageArrayLayers >= subresourceRange.layerCount) &&
 			       (subresourceRange.layerCount == 6);
 		case VK_IMAGE_VIEW_TYPE_CUBE_ARRAY:
 			return image->isCube() &&
 			       (imageArrayLayers >= subresourceRange.layerCount) &&
 			       (subresourceRange.layerCount >= 6);
 		case VK_IMAGE_VIEW_TYPE_3D:
 			return (imageType == VK_IMAGE_TYPE_3D) &&
 			       (imageArrayLayers == 1) &&
 			       (subresourceRange.layerCount == 1);
 		default:
 			UNREACHABLE("Unexpected viewType %d", (int)viewType);
 	}

 	return false;
 }

 void ImageView::clear(const VkClearValue &clearValue, const VkImageAspectFlags aspectMask, const VkRect2D &renderArea)
 {
 	// Note: clearing ignores swizzling, so components is ignored.

 	ASSERT(imageTypesMatch(image->getImageType()));
 	ASSERT(format.isCompatible(image->getFormat()));

 	VkImageSubresourceRange sr = subresourceRange;
 	sr.aspectMask = aspectMask;
 	image->clear(clearValue, format, renderArea, sr);
 }

 void ImageView::clear(const VkClearValue &clearValue, const VkImageAspectFlags aspectMask, const VkClearRect &renderArea)
 {
 	// Note: clearing ignores swizzling, so components is ignored.

 	ASSERT(imageTypesMatch(image->getImageType()));
 	ASSERT(format.isCompatible(image->getFormat()));

 	VkImageSubresourceRange sr;
 	sr.aspectMask = aspectMask;
 	sr.baseMipLevel = subresourceRange.baseMipLevel;
 	sr.levelCount = subresourceRange.levelCount;
 	sr.baseArrayLayer = renderArea.baseArrayLayer + subresourceRange.baseArrayLayer;
 	sr.layerCount = renderArea.layerCount;

 	image->clear(clearValue, format, renderArea.rect, sr);
 }

 void ImageView::clearWithLayerMask(const VkClearValue &clearValue, VkImageAspectFlags aspectMask, const VkRect2D &renderArea, uint32_t layerMask)
 {
 	while(layerMask)
 	{
 		uint32_t layer = sw::log2i(layerMask);
 		layerMask &= ~(1 << layer);
 		VkClearRect r = { renderArea, layer, 1 };
 		r.baseArrayLayer = layer;
 		clear(clearValue, aspectMask, r);
 	}
 }

 void ImageView::resolve(ImageView *resolveAttachment, int layer)
 {
 	if((subresourceRange.levelCount != 1) || (resolveAttachment->subresourceRange.levelCount != 1))
 	{
 		UNIMPLEMENTED("b/148242443: levelCount != 1");  // FIXME(b/148242443)
 	}

 	VkImageResolve region;
 	region.srcSubresource = {
 		subresourceRange.aspectMask,
 		subresourceRange.baseMipLevel,
 		subresourceRange.baseArrayLayer + layer,
 		1
 	};
 	region.srcOffset = { 0, 0, 0 };
 	region.dstSubresource = {
 		resolveAttachment->subresourceRange.aspectMask,
 		resolveAttachment->subresourceRange.baseMipLevel,
 		resolveAttachment->subresourceRange.baseArrayLayer + layer,
 		1
 	};
 	region.dstOffset = { 0, 0, 0 };
 	region.extent = image->getMipLevelExtent(static_cast<VkImageAspectFlagBits>(subresourceRange.aspectMask),
 	                                         subresourceRange.baseMipLevel);

 	image->resolveTo(resolveAttachment->image, region);
 }

 void ImageView::resolve(ImageView *resolveAttachment)
 {
 	if((subresourceRange.levelCount != 1) || (resolveAttachment->subresourceRange.levelCount != 1))
 	{
 		UNIMPLEMENTED("b/148242443: levelCount != 1");  // FIXME(b/148242443)
 	}

 	VkImageResolve region;
 	region.srcSubresource = {
 		subresourceRange.aspectMask,
 		subresourceRange.baseMipLevel,
 		subresourceRange.baseArrayLayer,
 		subresourceRange.layerCount
 	};
 	region.srcOffset = { 0, 0, 0 };
 	region.dstSubresource = {
 		resolveAttachment->subresourceRange.aspectMask,
 		resolveAttachment->subresourceRange.baseMipLevel,
 		resolveAttachment->subresourceRange.baseArrayLayer,
 		resolveAttachment->subresourceRange.layerCount
 	};
 	region.dstOffset = { 0, 0, 0 };
 	region.extent = image->getMipLevelExtent(static_cast<VkImageAspectFlagBits>(subresourceRange.aspectMask),
 	                                         subresourceRange.baseMipLevel);

 	image->resolveTo(resolveAttachment->image, region);
 }

 void ImageView::resolveWithLayerMask(ImageView *resolveAttachment, uint32_t layerMask)
 {
 	while(layerMask)
 	{
 		int layer = sw::log2i(layerMask);
 		layerMask &= ~(1 << layer);
 		resolve(resolveAttachment, layer);
 	}
 }

 const Image *ImageView::getImage(Usage usage) const
 {
 	switch(usage)
 	{
 		case RAW:
 			return image;
 		case SAMPLING:
 			return image->getSampledImage(format);
 		default:
 			UNREACHABLE("usage %d", int(usage));
 			return nullptr;
 	}
 }

 Format ImageView::getFormat(Usage usage) const
 {
 	Format imageFormat = ((usage == RAW) || (getImage(usage) == image)) ? format : getImage(usage)->getFormat();
 	return imageFormat.getAspectFormat(subresourceRange.aspectMask);
 }

 int ImageView::rowPitchBytes(VkImageAspectFlagBits aspect, uint32_t mipLevel, Usage usage) const
 {
 	return getImage(usage)->rowPitchBytes(aspect, subresourceRange.baseMipLevel + mipLevel);
 }

 int ImageView::slicePitchBytes(VkImageAspectFlagBits aspect, uint32_t mipLevel, Usage usage) const
 {
 	return getImage(usage)->slicePitchBytes(aspect, subresourceRange.baseMipLevel + mipLevel);
 }

 int ImageView::getMipLevelSize(VkImageAspectFlagBits aspect, uint32_t mipLevel, Usage usage) const
 {
 	return getImage(usage)->getMipLevelSize(aspect, subresourceRange.baseMipLevel + mipLevel);
 }

 int ImageView::layerPitchBytes(VkImageAspectFlagBits aspect, Usage usage) const
 {
 	return static_cast<int>(getImage(usage)->getLayerSize(aspect));
 }

 VkExtent2D ImageView::getMipLevelExtent(uint32_t mipLevel) const
 {
 	VkExtent3D extent = image->getMipLevelExtent(static_cast<VkImageAspectFlagBits>(subresourceRange.aspectMask),
 	                                             subresourceRange.baseMipLevel + mipLevel);

 	return { extent.width, extent.height };
 }

 int ImageView::getDepthOrLayerCount(uint32_t mipLevel) const
 {
 	VkExtent3D extent = image->getMipLevelExtent(static_cast<VkImageAspectFlagBits>(subresourceRange.aspectMask),
 	                                             subresourceRange.baseMipLevel + mipLevel);
 	int layers = subresourceRange.layerCount;
 	int depthOrLayers = layers > 1 ? layers : extent.depth;

 	// For cube images the number of whole cubes is returned
 	if(viewType == VK_IMAGE_VIEW_TYPE_CUBE ||
 	   viewType == VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)
 	{
 		depthOrLayers /= 6;
 	}

 	return depthOrLayers;
 }

 void *ImageView::getOffsetPointer(const VkOffset3D &offset, VkImageAspectFlagBits aspect, uint32_t mipLevel, uint32_t layer, Usage usage) const
 {
 	ASSERT(mipLevel < subresourceRange.levelCount);

 	VkImageSubresource imageSubresource = {
 		static_cast<VkImageAspectFlags>(aspect),
 		subresourceRange.baseMipLevel + mipLevel,
 		subresourceRange.baseArrayLayer + layer,
 	};

 	return getImage(usage)->getTexelPointer(offset, imageSubresource);
 }

 }  // namespace vk
	// Copyright 2018 The SwiftShader Authors. All Rights Reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	#include "VkImageView.hpp"

	#include "VkImage.hpp"
	#include "System/Math.hpp"

	#include <climits>

	namespace vk {

	VkComponentMapping ResolveIdentityMapping(VkComponentMapping mapping)
	{
	return {
	(mapping.r == VK_COMPONENT_SWIZZLE_IDENTITY) ? VK_COMPONENT_SWIZZLE_R : mapping.r,
	(mapping.g == VK_COMPONENT_SWIZZLE_IDENTITY) ? VK_COMPONENT_SWIZZLE_G : mapping.g,
	(mapping.b == VK_COMPONENT_SWIZZLE_IDENTITY) ? VK_COMPONENT_SWIZZLE_B : mapping.b,
	(mapping.a == VK_COMPONENT_SWIZZLE_IDENTITY) ? VK_COMPONENT_SWIZZLE_A : mapping.a,
	};
	}

	VkComponentMapping ResolveComponentMapping(VkComponentMapping mapping, vk::Format format)
	{
	mapping = vk::ResolveIdentityMapping(mapping);

	// Replace non-present components with zero/one swizzles so that the sampler
	// will give us correct interactions between channel replacement and texel replacement,
	// where we've had to invent new channels behind the app's back (eg transparent decompression
	// of ETC2 RGB -> BGRA8)
	VkComponentSwizzle table[] = {
	VK_COMPONENT_SWIZZLE_IDENTITY,
	VK_COMPONENT_SWIZZLE_ZERO,
	VK_COMPONENT_SWIZZLE_ONE,
	VK_COMPONENT_SWIZZLE_R,
	format.componentCount() < 2 ? VK_COMPONENT_SWIZZLE_ZERO : VK_COMPONENT_SWIZZLE_G,
	format.componentCount() < 3 ? VK_COMPONENT_SWIZZLE_ZERO : VK_COMPONENT_SWIZZLE_B,
	format.componentCount() < 4 ? VK_COMPONENT_SWIZZLE_ONE : VK_COMPONENT_SWIZZLE_A,
	};

	return { table[mapping.r], table[mapping.g], table[mapping.b], table[mapping.a] };
	}

	VkImageSubresourceRange ResolveRemainingLevelsLayers(VkImageSubresourceRange range, const vk::Image *image)
	{
	return {
	range.aspectMask,
	range.baseMipLevel,
	(range.levelCount == VK_REMAINING_MIP_LEVELS) ? (image->getMipLevels() - range.baseMipLevel) : range.levelCount,
	range.baseArrayLayer,
	(range.layerCount == VK_REMAINING_ARRAY_LAYERS) ? (image->getArrayLayers() - range.baseArrayLayer) : range.layerCount,
	};
	}

	Identifier::Identifier(const Image *image, VkImageViewType type, VkFormat fmt, VkComponentMapping mapping)
	{
	imageViewType = type;
	format = Format::mapTo8bit(fmt);
	r = mapping.r;
	g = mapping.g;
	b = mapping.b;
	a = mapping.a;
	}

	Identifier::Identifier(VkFormat fmt)
	{
	static_assert(vk::VK_IMAGE_VIEW_TYPE_END_RANGE == 6, "VkImageViewType does not allow using 7 to indicate buffer view");
	imageViewType = 7; // Still fits in 3-bit field
	format = Format::mapTo8bit(fmt);
	}

	ImageView::ImageView(const VkImageViewCreateInfo pCreateInfo, void mem, const vk::SamplerYcbcrConversion *ycbcrConversion)
	: image(vk::Cast(pCreateInfo->image))
	, viewType(pCreateInfo->viewType)
	, format(pCreateInfo->format)
	, components(ResolveComponentMapping(pCreateInfo->components, format))
	, subresourceRange(ResolveRemainingLevelsLayers(pCreateInfo->subresourceRange, image))
	, ycbcrConversion(ycbcrConversion)
	, id(image, viewType, format.getAspectFormat(subresourceRange.aspectMask), components)
	{
	}

	size_t ImageView::ComputeRequiredAllocationSize(const VkImageViewCreateInfo *pCreateInfo)
	{
	return 0;
	}

	void ImageView::destroy(const VkAllocationCallbacks *pAllocator)
	{
	}

	// Vulkan 1.2 Table 8. Image and image view parameter compatibility requirements
	bool ImageView::imageTypesMatch(VkImageType imageType) const
	{
	uint32_t imageArrayLayers = image->getArrayLayers();

	switch(viewType)
	{
	case VK_IMAGE_VIEW_TYPE_1D:
	return (imageType == VK_IMAGE_TYPE_1D) &&
	(subresourceRange.layerCount == 1);
	case VK_IMAGE_VIEW_TYPE_1D_ARRAY:
	return imageType == VK_IMAGE_TYPE_1D;
	case VK_IMAGE_VIEW_TYPE_2D:
	return ((imageType == VK_IMAGE_TYPE_2D) \|\|
	((imageType == VK_IMAGE_TYPE_3D) &&
	(imageArrayLayers == 1))) &&
	(subresourceRange.layerCount == 1);
	case VK_IMAGE_VIEW_TYPE_2D_ARRAY:
	return (imageType == VK_IMAGE_TYPE_2D) \|\|
	((imageType == VK_IMAGE_TYPE_3D) &&
	(imageArrayLayers == 1));
	case VK_IMAGE_VIEW_TYPE_CUBE:
	return image->isCube() &&
	(imageArrayLayers >= subresourceRange.layerCount) &&
	(subresourceRange.layerCount == 6);
	case VK_IMAGE_VIEW_TYPE_CUBE_ARRAY:
	return image->isCube() &&
	(imageArrayLayers >= subresourceRange.layerCount) &&
	(subresourceRange.layerCount >= 6);
	case VK_IMAGE_VIEW_TYPE_3D:
	return (imageType == VK_IMAGE_TYPE_3D) &&
	(imageArrayLayers == 1) &&
	(subresourceRange.layerCount == 1);
	default:
	UNREACHABLE("Unexpected viewType %d", (int)viewType);
	}

	return false;
	}

	void ImageView::clear(const VkClearValue &clearValue, const VkImageAspectFlags aspectMask, const VkRect2D &renderArea)
	{
	// Note: clearing ignores swizzling, so components is ignored.

	ASSERT(imageTypesMatch(image->getImageType()));
	ASSERT(format.isCompatible(image->getFormat()));

	VkImageSubresourceRange sr = subresourceRange;
	sr.aspectMask = aspectMask;
	image->clear(clearValue, format, renderArea, sr);
	}

	void ImageView::clear(const VkClearValue &clearValue, const VkImageAspectFlags aspectMask, const VkClearRect &renderArea)
	{
	// Note: clearing ignores swizzling, so components is ignored.

	ASSERT(imageTypesMatch(image->getImageType()));
	ASSERT(format.isCompatible(image->getFormat()));

	VkImageSubresourceRange sr;
	sr.aspectMask = aspectMask;
	sr.baseMipLevel = subresourceRange.baseMipLevel;
	sr.levelCount = subresourceRange.levelCount;
	sr.baseArrayLayer = renderArea.baseArrayLayer + subresourceRange.baseArrayLayer;
	sr.layerCount = renderArea.layerCount;

	image->clear(clearValue, format, renderArea.rect, sr);
	}

	void ImageView::clearWithLayerMask(const VkClearValue &clearValue, VkImageAspectFlags aspectMask, const VkRect2D &renderArea, uint32_t layerMask)
	{
	while(layerMask)
	{
	uint32_t layer = sw::log2i(layerMask);
	layerMask &= ~(1 << layer);
	VkClearRect r = { renderArea, layer, 1 };
	r.baseArrayLayer = layer;
	clear(clearValue, aspectMask, r);
	}
	}

	void ImageView::resolve(ImageView *resolveAttachment, int layer)
	{
	if((subresourceRange.levelCount != 1) \|\| (resolveAttachment->subresourceRange.levelCount != 1))
	{
	UNIMPLEMENTED("b/148242443: levelCount != 1"); // FIXME(b/148242443)
	}

	VkImageResolve region;
	region.srcSubresource = {
	subresourceRange.aspectMask,
	subresourceRange.baseMipLevel,
	subresourceRange.baseArrayLayer + layer,
	1
	};
	region.srcOffset = { 0, 0, 0 };
	region.dstSubresource = {
	resolveAttachment->subresourceRange.aspectMask,
	resolveAttachment->subresourceRange.baseMipLevel,
	resolveAttachment->subresourceRange.baseArrayLayer + layer,
	1
	};
	region.dstOffset = { 0, 0, 0 };
	region.extent = image->getMipLevelExtent(static_cast<VkImageAspectFlagBits>(subresourceRange.aspectMask),
	subresourceRange.baseMipLevel);

	image->resolveTo(resolveAttachment->image, region);
	}

	void ImageView::resolve(ImageView *resolveAttachment)
	{
	if((subresourceRange.levelCount != 1) \|\| (resolveAttachment->subresourceRange.levelCount != 1))
	{
	UNIMPLEMENTED("b/148242443: levelCount != 1"); // FIXME(b/148242443)
	}

	VkImageResolve region;
	region.srcSubresource = {
	subresourceRange.aspectMask,
	subresourceRange.baseMipLevel,
	subresourceRange.baseArrayLayer,
	subresourceRange.layerCount
	};
	region.srcOffset = { 0, 0, 0 };
	region.dstSubresource = {
	resolveAttachment->subresourceRange.aspectMask,
	resolveAttachment->subresourceRange.baseMipLevel,
	resolveAttachment->subresourceRange.baseArrayLayer,
	resolveAttachment->subresourceRange.layerCount
	};
	region.dstOffset = { 0, 0, 0 };
	region.extent = image->getMipLevelExtent(static_cast<VkImageAspectFlagBits>(subresourceRange.aspectMask),
	subresourceRange.baseMipLevel);

	image->resolveTo(resolveAttachment->image, region);
	}

	void ImageView::resolveWithLayerMask(ImageView *resolveAttachment, uint32_t layerMask)
	{
	while(layerMask)
	{
	int layer = sw::log2i(layerMask);
	layerMask &= ~(1 << layer);
	resolve(resolveAttachment, layer);
	}
	}

	const Image *ImageView::getImage(Usage usage) const
	{
	switch(usage)
	{
	case RAW:
	return image;
	case SAMPLING:
	return image->getSampledImage(format);
	default:
	UNREACHABLE("usage %d", int(usage));
	return nullptr;
	}
	}

	Format ImageView::getFormat(Usage usage) const
	{
	Format imageFormat = ((usage == RAW) \|\| (getImage(usage) == image)) ? format : getImage(usage)->getFormat();
	return imageFormat.getAspectFormat(subresourceRange.aspectMask);
	}

	int ImageView::rowPitchBytes(VkImageAspectFlagBits aspect, uint32_t mipLevel, Usage usage) const
	{
	return getImage(usage)->rowPitchBytes(aspect, subresourceRange.baseMipLevel + mipLevel);
	}

	int ImageView::slicePitchBytes(VkImageAspectFlagBits aspect, uint32_t mipLevel, Usage usage) const
	{
	return getImage(usage)->slicePitchBytes(aspect, subresourceRange.baseMipLevel + mipLevel);
	}

	int ImageView::getMipLevelSize(VkImageAspectFlagBits aspect, uint32_t mipLevel, Usage usage) const
	{
	return getImage(usage)->getMipLevelSize(aspect, subresourceRange.baseMipLevel + mipLevel);
	}

	int ImageView::layerPitchBytes(VkImageAspectFlagBits aspect, Usage usage) const
	{
	return static_cast<int>(getImage(usage)->getLayerSize(aspect));
	}

	VkExtent2D ImageView::getMipLevelExtent(uint32_t mipLevel) const
	{
	VkExtent3D extent = image->getMipLevelExtent(static_cast<VkImageAspectFlagBits>(subresourceRange.aspectMask),
	subresourceRange.baseMipLevel + mipLevel);

	return { extent.width, extent.height };
	}

	int ImageView::getDepthOrLayerCount(uint32_t mipLevel) const
	{
	VkExtent3D extent = image->getMipLevelExtent(static_cast<VkImageAspectFlagBits>(subresourceRange.aspectMask),
	subresourceRange.baseMipLevel + mipLevel);
	int layers = subresourceRange.layerCount;
	int depthOrLayers = layers > 1 ? layers : extent.depth;

	// For cube images the number of whole cubes is returned
	if(viewType == VK_IMAGE_VIEW_TYPE_CUBE \|\|
	viewType == VK_IMAGE_VIEW_TYPE_CUBE_ARRAY)
	{
	depthOrLayers /= 6;
	}

	return depthOrLayers;
	}

	void *ImageView::getOffsetPointer(const VkOffset3D &offset, VkImageAspectFlagBits aspect, uint32_t mipLevel, uint32_t layer, Usage usage) const
	{
	ASSERT(mipLevel < subresourceRange.levelCount);

	VkImageSubresource imageSubresource = {
	static_cast<VkImageAspectFlags>(aspect),
	subresourceRange.baseMipLevel + mipLevel,
	subresourceRange.baseArrayLayer + layer,
	};

	return getImage(usage)->getTexelPointer(offset, imageSubresource);
	}

	} // namespace vk