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// Copyright 2024 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_gpu_swap_chain.h"
#include "third_party/blink/renderer/modules/webgpu/gpu_device.h"
#include "third_party/blink/renderer/modules/xr/xr_layer_shared_image_manager.h"
namespace blink {
bool IsDepthFormat(wgpu::TextureFormat format) {
switch (format) {
case wgpu::TextureFormat::Depth24Plus:
case wgpu::TextureFormat::Depth16Unorm:
case wgpu::TextureFormat::Depth24PlusStencil8:
case wgpu::TextureFormat::Depth32Float:
case wgpu::TextureFormat::Depth32FloatStencil8:
return true;
default:
return false;
}
}
bool IsStencilFormat(wgpu::TextureFormat format) {
switch (format) {
case wgpu::TextureFormat::Stencil8:
case wgpu::TextureFormat::Depth24PlusStencil8:
case wgpu::TextureFormat::Depth32FloatStencil8:
return true;
default:
return false;
}
}
XRGPUSwapChain::XRGPUSwapChain(GPUDevice* device) : device_(device) {
CHECK(device);
}
// Clears the contents of the current texture to transparent black or 0 (for
// depth/stencil textures).
void XRGPUSwapChain::ClearCurrentTexture(wgpu::CommandEncoder command_encoder) {
GPUTexture* texture = current_texture();
if (!texture) {
return;
}
bool hasDepth = IsDepthFormat(texture->Format());
bool hasStencil = IsStencilFormat(texture->Format());
// Clear each level of the texture array.
for (uint32_t i = 0; i < texture->depthOrArrayLayers(); ++i) {
wgpu::TextureViewDescriptor view_desc = {
.dimension = wgpu::TextureViewDimension::e2D,
.baseMipLevel = 0,
.mipLevelCount = 1,
.baseArrayLayer = i,
.arrayLayerCount = 1,
};
wgpu::TextureView view = texture->GetHandle().CreateView(&view_desc);
wgpu::RenderPassEncoder render_pass;
if (hasDepth || hasStencil) {
wgpu::RenderPassDepthStencilAttachment depth_stencil_attachment = {
.view = view,
};
if (hasDepth) {
depth_stencil_attachment.depthLoadOp = wgpu::LoadOp::Clear;
depth_stencil_attachment.depthStoreOp = wgpu::StoreOp::Store;
depth_stencil_attachment.depthClearValue = 0;
}
if (hasStencil) {
depth_stencil_attachment.stencilLoadOp = wgpu::LoadOp::Clear;
depth_stencil_attachment.stencilStoreOp = wgpu::StoreOp::Store;
depth_stencil_attachment.stencilClearValue = 0;
}
wgpu::RenderPassDescriptor render_pass_desc = {
.depthStencilAttachment = &depth_stencil_attachment,
};
render_pass = command_encoder.BeginRenderPass(&render_pass_desc);
} else {
wgpu::RenderPassColorAttachment color_attachment = {
.view = view,
.loadOp = wgpu::LoadOp::Clear,
.storeOp = wgpu::StoreOp::Store,
.clearValue = {0, 0, 0, 0},
};
wgpu::RenderPassDescriptor render_pass_desc = {
.colorAttachmentCount = 1,
.colorAttachments = &color_attachment,
};
render_pass = command_encoder.BeginRenderPass(&render_pass_desc);
}
// Immediately end the render pass to clear the texture.
render_pass.End();
}
}
void XRGPUSwapChain::Trace(Visitor* visitor) const {
visitor->Trace(device_);
XRSwapChain::Trace(visitor);
}
XRGPUStaticSwapChain::XRGPUStaticSwapChain(GPUDevice* device,
const wgpu::TextureDescriptor& desc)
: XRGPUSwapChain(device) {
descriptor_ = desc;
}
GPUTexture* XRGPUStaticSwapChain::ProduceTexture() {
return GPUTexture::Create(device(), &descriptor_);
}
void XRGPUStaticSwapChain::OnFrameEnd() {
// TODO(crbug.com/5818595): Prior to shipping the spec needs to determine
// if texture re-use is appropriate or not. If re-use is not specified then
// it should at the very least be detached from the JavaScript wrapper and
// reattached to a new one here. In both cases the texture should be
// cleared.
wgpu::DawnEncoderInternalUsageDescriptor internal_usage_desc = {{
.useInternalUsages = true,
}};
wgpu::CommandEncoderDescriptor command_encoder_desc = {
.nextInChain = &internal_usage_desc,
.label = "XRGPUStaticSwapChain Clear",
};
wgpu::CommandEncoder command_encoder =
device()->GetHandle().CreateCommandEncoder(&command_encoder_desc);
ClearCurrentTexture(command_encoder);
wgpu::CommandBuffer command_buffer = command_encoder.Finish();
command_encoder = nullptr;
device()->GetHandle().GetQueue().Submit(1u, &command_buffer);
command_buffer = nullptr;
// Intentionally not calling ResetCurrentTexture() here to keep the previously
// produced texture for the next frame.
}
XRGPUMailboxSwapChain::XRGPUMailboxSwapChain(
GPUDevice* device,
const wgpu::TextureDescriptor& desc)
: XRGPUSwapChain(device) {
descriptor_ = desc;
// TODO(crbug.com/359418629): Internal Usage will not be necessary once we can
// use texture array mailboxes directly.
wgpu::TextureUsage internal_usage = wgpu::TextureUsage::CopyDst;
texture_internal_usage_ = {{
.internalUsage = internal_usage,
}};
descriptor_.nextInChain = &texture_internal_usage_;
}
GPUTexture* XRGPUMailboxSwapChain::ProduceTexture() {
const XRLayerSharedImages& shared_images = layer()->GetSharedImages();
// TODO(crbug.com/359418629): Allow for other mailboxes as well?
CHECK(shared_images.content_image_data.shared_image);
scoped_refptr<WebGPUMailboxTexture> mailbox_texture =
WebGPUMailboxTexture::FromExistingSharedImage(
device()->GetDawnControlClient(), device()->GetHandle(), descriptor_,
shared_images.content_image_data.shared_image,
shared_images.content_image_data.sync_token);
return MakeGarbageCollected<GPUTexture>(
device(), descriptor_.format, descriptor_.usage,
std::move(mailbox_texture), "WebXR Mailbox Swap Chain");
}
void XRGPUMailboxSwapChain::OnFrameEnd() {
GPUTexture* texture = ResetCurrentTexture();
if (texture) {
texture->DissociateMailbox();
}
}
} // namespace blink
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