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// Copyright 2017 The Dawn Authors
//
// 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 "utils/BackendBinding.h"
#include "common/Assert.h"
#include "common/SwapChainUtils.h"
#include "dawn_native/MetalBackend.h"
#define GLFW_EXPOSE_NATIVE_COCOA
#include "GLFW/glfw3.h"
#include "GLFW/glfw3native.h"
#import <QuartzCore/CAMetalLayer.h>
namespace utils {
class SwapChainImplMTL {
public:
using WSIContext = DawnWSIContextMetal;
SwapChainImplMTL(id nsWindow) : mNsWindow(nsWindow) {
}
~SwapChainImplMTL() {
[mCurrentTexture release];
[mCurrentDrawable release];
}
void Init(DawnWSIContextMetal* ctx) {
mMtlDevice = ctx->device;
mCommandQueue = ctx->queue;
}
DawnSwapChainError Configure(WGPUTextureFormat format,
WGPUTextureUsage usage,
uint32_t width,
uint32_t height) {
if (format != WGPUTextureFormat_BGRA8Unorm) {
return "unsupported format";
}
ASSERT(width > 0);
ASSERT(height > 0);
NSView* contentView = [mNsWindow contentView];
[contentView setWantsLayer:YES];
CGSize size = {};
size.width = width;
size.height = height;
mLayer = [CAMetalLayer layer];
[mLayer setDevice:mMtlDevice];
[mLayer setPixelFormat:MTLPixelFormatBGRA8Unorm];
[mLayer setDrawableSize:size];
constexpr uint32_t kFramebufferOnlyTextureUsages =
WGPUTextureUsage_RenderAttachment | WGPUTextureUsage_Present;
bool hasOnlyFramebufferUsages = !(usage & (~kFramebufferOnlyTextureUsages));
if (hasOnlyFramebufferUsages) {
[mLayer setFramebufferOnly:YES];
}
[contentView setLayer:mLayer];
return DAWN_SWAP_CHAIN_NO_ERROR;
}
DawnSwapChainError GetNextTexture(DawnSwapChainNextTexture* nextTexture) {
[mCurrentDrawable release];
mCurrentDrawable = [mLayer nextDrawable];
[mCurrentDrawable retain];
[mCurrentTexture release];
mCurrentTexture = mCurrentDrawable.texture;
[mCurrentTexture retain];
nextTexture->texture.ptr = reinterpret_cast<void*>(mCurrentTexture);
return DAWN_SWAP_CHAIN_NO_ERROR;
}
DawnSwapChainError Present() {
id<MTLCommandBuffer> commandBuffer = [mCommandQueue commandBuffer];
[commandBuffer presentDrawable:mCurrentDrawable];
[commandBuffer commit];
return DAWN_SWAP_CHAIN_NO_ERROR;
}
private:
id mNsWindow = nil;
id<MTLDevice> mMtlDevice = nil;
id<MTLCommandQueue> mCommandQueue = nil;
CAMetalLayer* mLayer = nullptr;
id<CAMetalDrawable> mCurrentDrawable = nil;
id<MTLTexture> mCurrentTexture = nil;
};
class MetalBinding : public BackendBinding {
public:
MetalBinding(GLFWwindow* window, WGPUDevice device) : BackendBinding(window, device) {
}
uint64_t GetSwapChainImplementation() override {
if (mSwapchainImpl.userData == nullptr) {
mSwapchainImpl = CreateSwapChainImplementation(
new SwapChainImplMTL(glfwGetCocoaWindow(mWindow)));
}
return reinterpret_cast<uint64_t>(&mSwapchainImpl);
}
WGPUTextureFormat GetPreferredSwapChainTextureFormat() override {
return WGPUTextureFormat_BGRA8Unorm;
}
private:
DawnSwapChainImplementation mSwapchainImpl = {};
};
BackendBinding* CreateMetalBinding(GLFWwindow* window, WGPUDevice device) {
return new MetalBinding(window, device);
}
}