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// 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 { namespace 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(DawnTextureFormat format,
DawnTextureUsage usage,
uint32_t width,
uint32_t height) {
if (format != DAWN_TEXTURE_FORMAT_RGBA8_UNORM) {
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.BlitFramebuffer(0, 0, mWidth, mHeight, 0, mHeight, mWidth, 0, GL_COLOR_BUFFER_BIT,
GL_NEAREST);
mPresentCallback(mPresentUserdata);
return DAWN_SWAP_CHAIN_NO_ERROR;
}
dawn::TextureFormat NativeSwapChainImpl::GetPreferredFormat() const {
return dawn::TextureFormat::RGBA8Unorm;
}
}} // namespace dawn_native::opengl
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