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/*
* Copyright (C) 2021 Igalia, S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* aint with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "OpenXRLayer.h"
#if ENABLE(WEBXR) && USE(OPENXR)
using namespace WebCore;
namespace PlatformXR {
// OpenXRLayerProjection
std::unique_ptr<OpenXRLayerProjection> OpenXRLayerProjection::create(XrInstance instance, XrSession session, uint32_t width, uint32_t height, int64_t format, uint32_t sampleCount)
{
if (!width || !height || !sampleCount)
return nullptr;
auto info = createStructure<XrSwapchainCreateInfo, XR_TYPE_SWAPCHAIN_CREATE_INFO>();
info.arraySize = 1;
info.format = format;
info.width = width;
info.height = height;
info.mipCount = 1;
info.faceCount = 1;
info.arraySize = 1;
info.sampleCount = sampleCount;
info.usageFlags = XR_SWAPCHAIN_USAGE_SAMPLED_BIT | XR_SWAPCHAIN_USAGE_COLOR_ATTACHMENT_BIT;
auto swapchain = OpenXRSwapchain::create(instance, session, info);
if (!swapchain)
return nullptr;
return std::unique_ptr<OpenXRLayerProjection>(new OpenXRLayerProjection(makeUniqueRefFromNonNullUniquePtr(WTFMove(swapchain))));
}
OpenXRLayerProjection::OpenXRLayerProjection(UniqueRef<OpenXRSwapchain>&& swapchain)
: m_swapchain(WTFMove(swapchain))
, m_layerProjection(createStructure<XrCompositionLayerProjection, XR_TYPE_COMPOSITION_LAYER_PROJECTION>())
{
}
std::optional<Device::FrameData::LayerData> OpenXRLayerProjection::startFrame()
{
auto texture = m_swapchain->acquireImage();
if (!texture)
return std::nullopt;
return Device::FrameData::LayerData { *texture };
}
XrCompositionLayerBaseHeader* OpenXRLayerProjection::endFrame(const Device::Layer& layer, XrSpace space, const Vector<XrView>& frameViews)
{
ASSERT(layer.views.size() == frameViews.size());
auto viewCount = frameViews.size();
m_projectionViews.fill(createStructure<XrCompositionLayerProjectionView, XR_TYPE_COMPOSITION_LAYER_PROJECTION_VIEW>(), viewCount);
m_layerProjection.layerFlags = XR_COMPOSITION_LAYER_BLEND_TEXTURE_SOURCE_ALPHA_BIT;
for (uint32_t i = 0; i < viewCount; ++i) {
m_projectionViews[i].pose = frameViews[i].pose;
m_projectionViews[i].fov = frameViews[i].fov;
m_projectionViews[i].subImage.swapchain = m_swapchain->swapchain();
auto& viewport = layer.views[i].viewport;
m_projectionViews[i].subImage.imageRect.offset = { viewport.x(), viewport.y() };
m_projectionViews[i].subImage.imageRect.extent = { viewport.width(), viewport.height() };
}
m_layerProjection.space = space;
m_layerProjection.viewCount = m_projectionViews.size();
m_layerProjection.views = m_projectionViews.data();
m_swapchain->releaseImage();
return reinterpret_cast<XrCompositionLayerBaseHeader*>(&m_layerProjection);
}
} // namespace PlatformXR
#endif // ENABLE(WEBXR) && USE(OPENXR)
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