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// Copyright 2019 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 "MetalSurface.hpp"
#include "Vulkan/VkDeviceMemory.hpp"
#include "Vulkan/VkImage.hpp"
#include <Metal/Metal.h>
#include <QuartzCore/CAMetalLayer.h>
#include <AppKit/NSView.h>
namespace vk {
class MetalLayer
{
public:
void initWithLayer(const void* pLayer) API_AVAILABLE(macosx(10.11))
{
view = nullptr;
layer = nullptr;
id<NSObject> obj = (id<NSObject>)pLayer;
if(!NSThread.isMainThread)
{
UNREACHABLE("MetalLayer::init(): not called from main thread");
}
if([obj isKindOfClass: [CAMetalLayer class]])
{
layer = (CAMetalLayer*)[obj retain];
layer.framebufferOnly = false;
layer.device = MTLCreateSystemDefaultDevice();
}
else
{
UNREACHABLE("MetalLayer::init(): view doesn't have metal backed layer");
}
}
void initWithView(const void* pView) API_AVAILABLE(macosx(10.11))
{
view = nullptr;
layer = nullptr;
id<NSObject> obj = (id<NSObject>)pView;
if([obj isKindOfClass: [NSView class]])
{
NSView* objView = (NSView*)[obj retain];
initWithLayer(objView.layer);
view = objView;
}
}
void release() API_AVAILABLE(macosx(10.11))
{
if(layer)
{
[layer.device release];
[layer release];
}
if(view)
{
[view release];
}
}
// Synchronizes the drawableSize to layer.bounds.size * layer.contentsScale and returns the new value of
// drawableSize.
VkExtent2D syncExtent() const API_AVAILABLE(macosx(10.11))
{
if(layer)
{
CGSize drawSize = layer.bounds.size;
CGFloat scaleFactor = layer.contentsScale;
drawSize.width = trunc(drawSize.width * scaleFactor);
drawSize.height = trunc(drawSize.height * scaleFactor);
[layer setDrawableSize: drawSize];
return { static_cast<uint32_t>(drawSize.width), static_cast<uint32_t>(drawSize.height) };
}
else
{
return { 0, 0 };
}
}
id<CAMetalDrawable> getNextDrawable() const API_AVAILABLE(macosx(10.11))
{
if(layer)
{
return [layer nextDrawable];
}
return nil;
}
VkExtent2D getDrawableSize() const API_AVAILABLE(macosx(10.11)) {
if (layer) {
return {
static_cast<uint32_t>([layer drawableSize].width),
static_cast<uint32_t>([layer drawableSize].height),
};
}
return {0, 0};
}
private:
NSView* view;
CAMetalLayer* layer API_AVAILABLE(macosx(10.11));
};
MetalSurface::MetalSurface(const void *pCreateInfo, void *mem) : metalLayer(reinterpret_cast<MetalLayer*>(mem))
{
}
void MetalSurface::destroySurface(const VkAllocationCallbacks *pAllocator) API_AVAILABLE(macosx(10.11))
{
if(metalLayer)
{
metalLayer->release();
}
vk::deallocate(metalLayer, pAllocator);
}
size_t MetalSurface::ComputeRequiredAllocationSize(const void *pCreateInfo) API_AVAILABLE(macosx(10.11))
{
return sizeof(MetalLayer);
}
void MetalSurface::getSurfaceCapabilities(VkSurfaceCapabilitiesKHR *pSurfaceCapabilities) const API_AVAILABLE(macosx(10.11))
{
SurfaceKHR::getSurfaceCapabilities(pSurfaceCapabilities);
// The value of drawableSize in CAMetalLayer is set the first time a drawable is queried but after that it is the
// (Metal) application's responsibility to resize the drawable when the window is resized. The best time for Swiftshader
// to resize the drawable is when querying the capabilities of the swapchain as that's done when the Vulkan application
// is trying to handle a window resize.
VkExtent2D extent = metalLayer->syncExtent();
pSurfaceCapabilities->currentExtent = extent;
pSurfaceCapabilities->minImageExtent = extent;
pSurfaceCapabilities->maxImageExtent = extent;
}
VkResult MetalSurface::present(PresentImage* image) API_AVAILABLE(macosx(10.11))
{
@autoreleasepool
{
auto drawable = metalLayer->getNextDrawable();
if(drawable)
{
const VkExtent3D &extent = image->getImage()->getExtent();
VkExtent2D drawableExtent = metalLayer->getDrawableSize();
if(drawableExtent.width != extent.width || drawableExtent.height != extent.height)
{
return VK_ERROR_OUT_OF_DATE_KHR;
}
[drawable.texture replaceRegion:MTLRegionMake2D(0, 0, extent.width, extent.height)
mipmapLevel:0
withBytes:image->getImageMemory()->getOffsetPointer(0)
bytesPerRow:image->getImage()->rowPitchBytes(VK_IMAGE_ASPECT_COLOR_BIT, 0)];
[drawable present];
}
}
return VK_SUCCESS;
}
#ifdef VK_USE_PLATFORM_METAL_EXT
MetalSurfaceEXT::MetalSurfaceEXT(const VkMetalSurfaceCreateInfoEXT *pCreateInfo, void *mem) API_AVAILABLE(macosx(10.11))
: MetalSurface(pCreateInfo, mem)
{
metalLayer->initWithLayer(pCreateInfo->pLayer);
}
#endif
#ifdef VK_USE_PLATFORM_MACOS_MVK
MacOSSurfaceMVK::MacOSSurfaceMVK(const VkMacOSSurfaceCreateInfoMVK *pCreateInfo, void *mem) API_AVAILABLE(macosx(10.11))
: MetalSurface(pCreateInfo, mem)
{
metalLayer->initWithView(pCreateInfo->pView);
}
#endif
}