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/* Copyright (c) 2023-2025 Valve Corporation
* Copyright (c) 2023-2025 LunarG, Inc.
*
* 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 "image_layout_utils.h"
static VkImageLayout NormalizeDepthImageLayout(VkImageLayout layout) {
switch (layout) {
case VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL:
case VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_STENCIL_ATTACHMENT_OPTIMAL:
return VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_OPTIMAL;
case VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL:
case VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_STENCIL_READ_ONLY_OPTIMAL:
return VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_OPTIMAL;
default:
return layout;
}
}
static VkImageLayout NormalizeStencilImageLayout(VkImageLayout layout) {
switch (layout) {
case VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL:
case VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_STENCIL_READ_ONLY_OPTIMAL:
return VK_IMAGE_LAYOUT_STENCIL_READ_ONLY_OPTIMAL;
case VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL:
case VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_STENCIL_ATTACHMENT_OPTIMAL:
return VK_IMAGE_LAYOUT_STENCIL_ATTACHMENT_OPTIMAL;
default:
return layout;
}
}
VkImageLayout NormalizeSynchronization2Layout(const VkImageAspectFlags aspect_mask, VkImageLayout layout) {
if (layout == VK_IMAGE_LAYOUT_ATTACHMENT_OPTIMAL) {
if (aspect_mask == VK_IMAGE_ASPECT_COLOR_BIT) {
layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
} else if (aspect_mask == (VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT)) {
layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_ATTACHMENT_OPTIMAL;
} else if (aspect_mask == VK_IMAGE_ASPECT_DEPTH_BIT) {
layout = VK_IMAGE_LAYOUT_DEPTH_ATTACHMENT_OPTIMAL;
} else if (aspect_mask == VK_IMAGE_ASPECT_STENCIL_BIT) {
layout = VK_IMAGE_LAYOUT_STENCIL_ATTACHMENT_OPTIMAL;
}
} else if (layout == VK_IMAGE_LAYOUT_READ_ONLY_OPTIMAL) {
if (aspect_mask == VK_IMAGE_ASPECT_COLOR_BIT) {
layout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
} else if (aspect_mask == (VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT)) {
layout = VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL;
} else if (aspect_mask == VK_IMAGE_ASPECT_DEPTH_BIT) {
layout = VK_IMAGE_LAYOUT_DEPTH_READ_ONLY_OPTIMAL;
} else if (aspect_mask == VK_IMAGE_ASPECT_STENCIL_BIT) {
layout = VK_IMAGE_LAYOUT_STENCIL_READ_ONLY_OPTIMAL;
}
}
return layout;
}
bool ImageLayoutMatches(const VkImageAspectFlags aspect_mask, VkImageLayout a, VkImageLayout b) {
if (a == b) {
return true;
}
// Map sync2 generic layouts (ATTACHMENT_OPTIMAL, READ_ONLY_OPTIMAL) to equivalent basic layouts
a = NormalizeSynchronization2Layout(aspect_mask, a);
b = NormalizeSynchronization2Layout(aspect_mask, b);
if (a == b) {
return true;
}
// Relaxed rules when referencing *only* the depth or stencil aspects.
// When accessing both, normalize layouts for aspects separately.
if (aspect_mask & (VK_IMAGE_ASPECT_DEPTH_BIT | VK_IMAGE_ASPECT_STENCIL_BIT)) {
bool matches = true;
if ((aspect_mask & VK_IMAGE_ASPECT_DEPTH_BIT) != 0) {
matches &= NormalizeDepthImageLayout(a) == NormalizeDepthImageLayout(b);
}
if ((aspect_mask & VK_IMAGE_ASPECT_STENCIL_BIT) != 0) {
matches &= NormalizeStencilImageLayout(a) == NormalizeStencilImageLayout(b);
}
return matches;
}
return false;
}
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