tint->dawn: Move src/dawn_native -> src/dawn/native

Bug: dawn:1275
Change-Id: Ic60a00107a015bc677ff929c492f1085ffc38482
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/79083
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ben Clayton <bclayton@chromium.org>

src/dawn/native/opengl/NativeSwapChainImplGL.cpp

@@ -0,0 +1,88 @@
+// 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