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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.
#include "third_party/blink/renderer/modules/xr/xr_webgl_swap_chain.h"
#include "third_party/blink/renderer/modules/webgl/webgl_framebuffer.h"
#include "third_party/blink/renderer/modules/webgl/webgl_rendering_context_base.h"
#include "third_party/blink/renderer/modules/webgl/webgl_texture.h"
#include "third_party/blink/renderer/modules/xr/xr_layer_shared_image_manager.h"
#include "third_party/blink/renderer/platform/graphics/gpu/xr_webgl_drawing_buffer.h"
namespace blink {
XRWebGLSwapChain::XRWebGLSwapChain(
WebGLRenderingContextBase* context,
const XRWebGLSwapChain::Descriptor& descriptor,
bool webgl2)
: webgl_context_(context), descriptor_(descriptor), webgl2_(webgl2) {
CHECK(context);
}
// Clears the contents of the current texture to transparent black or 0 (for
// depth/stencil textures).
void XRWebGLSwapChain::ClearCurrentTexture() {
WebGLUnownedTexture* texture = current_texture();
if (!texture) {
return;
}
gpu::gles2::GLES2Interface* gl = context()->ContextGL();
if (!gl) {
return;
}
GLenum attachment = descriptor_.attachment_target;
gl->BindFramebuffer(GL_FRAMEBUFFER, GetFramebuffer()->Object());
GLbitfield clear_bits = 0;
if (attachment == GL_COLOR_ATTACHMENT0) {
clear_bits |= GL_COLOR_BUFFER_BIT;
gl->ColorMask(true, true, true, true);
gl->ClearColor(0, 0, 0, 0);
} else if (attachment == GL_DEPTH_ATTACHMENT) {
clear_bits |= GL_DEPTH_BUFFER_BIT;
gl->DepthMask(true);
gl->ClearDepthf(1.0f);
} else if (attachment == GL_STENCIL_ATTACHMENT) {
clear_bits |= GL_STENCIL_BUFFER_BIT;
gl->StencilMaskSeparate(GL_FRONT, true);
gl->ClearStencil(0);
}
gl->Disable(GL_SCISSOR_TEST);
if (descriptor_.layers > 1) {
for (uint32_t i = 0; i < descriptor_.layers; ++i) {
gl->FramebufferTextureLayer(GL_FRAMEBUFFER, attachment, texture->Object(),
0, i);
gl->Clear(clear_bits);
}
} else {
gl->FramebufferTexture2D(GL_FRAMEBUFFER, attachment, GL_TEXTURE_2D,
texture->Object(), 0);
gl->Clear(clear_bits);
}
// WebGLRenderingContextBase inherits from DrawingBuffer::Client, but makes
// all the methods private. Downcasting allows us to access them.
DrawingBuffer::Client* client =
static_cast<DrawingBuffer::Client*>(context());
client->DrawingBufferClientRestoreScissorTest();
client->DrawingBufferClientRestoreMaskAndClearValues();
client->DrawingBufferClientRestoreFramebufferBinding();
}
WebGLFramebuffer* XRWebGLSwapChain::GetFramebuffer() {
if (!framebuffer_) {
framebuffer_ = webgl_context_->createFramebuffer();
}
return framebuffer_;
}
void XRWebGLSwapChain::Trace(Visitor* visitor) const {
visitor->Trace(webgl_context_);
visitor->Trace(framebuffer_);
XRSwapChain::Trace(visitor);
}
XRWebGLStaticSwapChain::XRWebGLStaticSwapChain(
WebGLRenderingContextBase* context,
const XRWebGLSwapChain::Descriptor& descriptor,
bool webgl2)
: XRWebGLSwapChain(context, descriptor, webgl2) {}
XRWebGLStaticSwapChain::~XRWebGLStaticSwapChain() {
if (owned_texture_) {
gpu::gles2::GLES2Interface* gl = context()->ContextGL();
if (!gl) {
return;
}
gl->DeleteTextures(1, &owned_texture_);
}
}
WebGLUnownedTexture* XRWebGLStaticSwapChain::ProduceTexture() {
gpu::gles2::GLES2Interface* gl = context()->ContextGL();
if (!gl) {
return nullptr;
}
GLenum target = descriptor().layers > 1 ? GL_TEXTURE_2D_ARRAY : GL_TEXTURE_2D;
gl->GenTextures(1, &owned_texture_);
gl->BindTexture(target, owned_texture_);
// WebGLRenderingContextBase inherits from DrawingBuffer::Client, but makes
// all the methods private. Downcasting allows us to access them.
DrawingBuffer::Client* client =
static_cast<DrawingBuffer::Client*>(context());
if (target == GL_TEXTURE_2D_ARRAY) {
CHECK(webgl2()); // Texture arrays are only available in WebGL 2
gl->TexStorage3D(target, 1, descriptor().internal_format,
descriptor().width, descriptor().height,
descriptor().layers);
client->DrawingBufferClientRestoreTexture2DArrayBinding();
} else {
if (webgl2()) {
gl->TexStorage2DEXT(target, 1, descriptor().internal_format,
descriptor().width, descriptor().height);
} else {
gl->TexImage2D(target, 0, descriptor().format, descriptor().width,
descriptor().height, 0, descriptor().format,
descriptor().type, nullptr);
}
client->DrawingBufferClientRestoreTexture2DBinding();
}
return MakeGarbageCollected<WebGLUnownedTexture>(context(), owned_texture_,
target);
}
void XRWebGLStaticSwapChain::OnFrameEnd() {
ClearCurrentTexture();
// Intentionally not calling ResetCurrentTexture() here to keep the previously
// produced texture for the next frame.
}
XRWebGLSharedImageSwapChain::XRWebGLSharedImageSwapChain(
WebGLRenderingContextBase* context,
const XRWebGLSwapChain::Descriptor& descriptor,
bool webgl2)
: XRWebGLSwapChain(context, descriptor, webgl2) {
// SharedImages cannot have multiple layers yet.
CHECK_EQ(descriptor.layers, 1);
}
WebGLUnownedTexture* XRWebGLSharedImageSwapChain::ProduceTexture() {
gpu::gles2::GLES2Interface* context_gl = context()->ContextGL();
if (!context_gl) {
return nullptr;
}
const XRLayerSharedImages& shared_images = layer()->GetSharedImages();
const XRSharedImageData& content_image_data =
shared_images.content_image_data;
CHECK(content_image_data.shared_image);
CHECK(content_image_data.sync_token.HasData());
// Create a texture backed by the shared image.
CHECK(!shared_image_texture_);
shared_image_texture_ =
content_image_data.shared_image->CreateGLTexture(context_gl);
shared_image_scoped_access_ =
shared_image_texture_->BeginAccess(content_image_data.sync_token,
/*readonly=*/false);
return MakeGarbageCollected<WebGLUnownedTexture>(
context(), shared_image_texture_->id(), GL_TEXTURE_2D);
}
void XRWebGLSharedImageSwapChain::OnFrameEnd() {
WebGLUnownedTexture* texture = ResetCurrentTexture();
if (texture) {
DCHECK(shared_image_texture_);
gpu::SharedImageTexture::ScopedAccess::EndAccess(
std::move(shared_image_scoped_access_));
shared_image_texture_.reset();
// Notify our WebGLUnownedTexture that we have deleted it.
static_cast<WebGLUnownedTexture*>(texture)->OnGLDeleteTextures();
}
}
} // namespace blink
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