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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_XR_XR_WEBGL_SWAP_CHAIN_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_XR_XR_WEBGL_SWAP_CHAIN_H_
#include "third_party/blink/renderer/modules/webgl/webgl_rendering_context_base.h"
#include "third_party/blink/renderer/modules/webgl/webgl_unowned_texture.h"
#include "third_party/blink/renderer/modules/xr/xr_swap_chain.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/member.h"
namespace blink {
class WebGLRenderingContextBase;
class WebGLUnownedTexture;
class XRWebGLSwapChain : public XRSwapChain<WebGLUnownedTexture> {
public:
struct Descriptor {
GLenum format;
GLenum internal_format;
GLenum type;
GLenum attachment_target;
uint16_t width;
uint16_t height;
uint16_t layers;
};
XRWebGLSwapChain(WebGLRenderingContextBase*,
const XRWebGLSwapChain::Descriptor&,
bool webgl_2);
~XRWebGLSwapChain() override = default;
WebGLRenderingContextBase* context() { return webgl_context_.Get(); }
const XRWebGLSwapChain::Descriptor& descriptor() const { return descriptor_; }
bool webgl2() const { return webgl2_; }
void Trace(Visitor* visitor) const override;
void ClearCurrentTexture();
virtual scoped_refptr<StaticBitmapImage> TransferToStaticBitmapImage() {
return nullptr;
}
protected:
WebGLFramebuffer* GetFramebuffer();
private:
Member<WebGLRenderingContextBase> webgl_context_;
Member<WebGLFramebuffer> framebuffer_;
XRWebGLSwapChain::Descriptor descriptor_;
bool webgl2_;
};
// A texture swap chain that is not communicated back to the compositor, used
// for things like depth/stencil attachments that don't assist reprojection.
class XRWebGLStaticSwapChain final : public XRWebGLSwapChain {
public:
XRWebGLStaticSwapChain(WebGLRenderingContextBase*,
const XRWebGLSwapChain::Descriptor&,
bool webgl2);
~XRWebGLStaticSwapChain() override;
WebGLUnownedTexture* ProduceTexture() override;
void OnFrameEnd() override;
private:
GLuint owned_texture_;
};
// A swap chain backed by SharedImages
class XRWebGLSharedImageSwapChain final : public XRWebGLSwapChain {
public:
XRWebGLSharedImageSwapChain(WebGLRenderingContextBase*,
const XRWebGLSwapChain::Descriptor&,
bool webgl2);
~XRWebGLSharedImageSwapChain() override = default;
WebGLUnownedTexture* ProduceTexture() override;
void OnFrameEnd() override;
private:
std::unique_ptr<gpu::SharedImageTexture> shared_image_texture_;
std::unique_ptr<gpu::SharedImageTexture::ScopedAccess>
shared_image_scoped_access_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_XR_XR_WEBGL_SWAP_CHAIN_H_
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