| // Copyright 2019 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 "dawn/native/opengl/NativeSwapChainImplGL.h" |
| |
| #include "dawn/native/opengl/DeviceGL.h" |
| |
| namespace dawn::native::opengl { |
| |
| NativeSwapChainImpl::NativeSwapChainImpl(Device* device, |
| PresentCallback present, |
| void* presentUserdata) |
| : mPresentCallback(present), mPresentUserdata(presentUserdata), mDevice(device) { |
| } |
| |
| NativeSwapChainImpl::~NativeSwapChainImpl() { |
| const OpenGLFunctions& gl = mDevice->gl; |
| gl.DeleteTextures(1, &mBackTexture); |
| gl.DeleteFramebuffers(1, &mBackFBO); |
| } |
| |
| void NativeSwapChainImpl::Init(DawnWSIContextGL* /*context*/) { |
| const OpenGLFunctions& gl = mDevice->gl; |
| gl.GenTextures(1, &mBackTexture); |
| gl.BindTexture(GL_TEXTURE_2D, mBackTexture); |
| gl.TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 0, 0, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr); |
| |
| gl.GenFramebuffers(1, &mBackFBO); |
| gl.BindFramebuffer(GL_READ_FRAMEBUFFER, mBackFBO); |
| gl.FramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, |
| mBackTexture, 0); |
| } |
| |
| DawnSwapChainError NativeSwapChainImpl::Configure(WGPUTextureFormat format, |
| WGPUTextureUsage usage, |
| uint32_t width, |
| uint32_t height) { |
| if (format != WGPUTextureFormat_RGBA8Unorm) { |
| return "unsupported format"; |
| } |
| ASSERT(width > 0); |
| ASSERT(height > 0); |
| mWidth = width; |
| mHeight = height; |
| |
| const OpenGLFunctions& gl = mDevice->gl; |
| gl.BindTexture(GL_TEXTURE_2D, mBackTexture); |
| // Reallocate the texture |
| gl.TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, |
| nullptr); |
| |
| return DAWN_SWAP_CHAIN_NO_ERROR; |
| } |
| |
| DawnSwapChainError NativeSwapChainImpl::GetNextTexture(DawnSwapChainNextTexture* nextTexture) { |
| nextTexture->texture.u32 = mBackTexture; |
| return DAWN_SWAP_CHAIN_NO_ERROR; |
| } |
| |
| DawnSwapChainError NativeSwapChainImpl::Present() { |
| const OpenGLFunctions& gl = mDevice->gl; |
| gl.BindFramebuffer(GL_READ_FRAMEBUFFER, mBackFBO); |
| gl.BindFramebuffer(GL_DRAW_FRAMEBUFFER, 0); |
| gl.Scissor(0, 0, mWidth, mHeight); |
| gl.BlitFramebuffer(0, 0, mWidth, mHeight, 0, mHeight, mWidth, 0, GL_COLOR_BUFFER_BIT, |
| GL_NEAREST); |
| |
| mPresentCallback(mPresentUserdata); |
| |
| return DAWN_SWAP_CHAIN_NO_ERROR; |
| } |
| |
| wgpu::TextureFormat NativeSwapChainImpl::GetPreferredFormat() const { |
| return wgpu::TextureFormat::RGBA8Unorm; |
| } |
| |
| } // namespace dawn::native::opengl |