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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/** \file
* \ingroup GHOST
*/
#include <cassert>
#include "GHOST_C-api.h"
#include "GHOST_IXrGraphicsBinding.h"
#include "GHOST_XrException.h"
#include "GHOST_XrSession.h"
#include "GHOST_Xr_intern.h"
#include "GHOST_XrSwapchain.h"
struct OpenXRSwapchainData {
using ImageVec = std::vector<XrSwapchainImageBaseHeader *>;
XrSwapchain swapchain = XR_NULL_HANDLE;
ImageVec swapchain_images;
};
static OpenXRSwapchainData::ImageVec swapchain_images_create(XrSwapchain swapchain,
GHOST_IXrGraphicsBinding &gpu_binding)
{
std::vector<XrSwapchainImageBaseHeader *> images;
uint32_t image_count;
CHECK_XR(xrEnumerateSwapchainImages(swapchain, 0, &image_count, nullptr),
"Failed to get count of swapchain images to create for the VR session.");
images = gpu_binding.createSwapchainImages(image_count);
CHECK_XR(xrEnumerateSwapchainImages(swapchain, images.size(), &image_count, images[0]),
"Failed to create swapchain images for the VR session.");
return images;
}
GHOST_XrSwapchain::GHOST_XrSwapchain(GHOST_IXrGraphicsBinding &gpu_binding,
const XrSession &session,
const XrViewConfigurationView &view_config)
: m_oxr(std::make_unique<OpenXRSwapchainData>())
{
XrSwapchainCreateInfo create_info = {XR_TYPE_SWAPCHAIN_CREATE_INFO};
uint32_t format_count = 0;
CHECK_XR(xrEnumerateSwapchainFormats(session, 0, &format_count, nullptr),
"Failed to get count of swapchain image formats.");
std::vector<int64_t> swapchain_formats(format_count);
CHECK_XR(xrEnumerateSwapchainFormats(
session, swapchain_formats.size(), &format_count, swapchain_formats.data()),
"Failed to get swapchain image formats.");
assert(swapchain_formats.size() == format_count);
std::optional chosen_format = gpu_binding.chooseSwapchainFormat(
swapchain_formats, m_format, m_is_srgb_buffer);
if (!chosen_format) {
throw GHOST_XrException(
"Error: No format matching OpenXR runtime supported swapchain formats found.");
}
create_info.usageFlags = XR_SWAPCHAIN_USAGE_SAMPLED_BIT |
XR_SWAPCHAIN_USAGE_COLOR_ATTACHMENT_BIT;
create_info.format = *chosen_format;
create_info.sampleCount = view_config.recommendedSwapchainSampleCount;
create_info.width = view_config.recommendedImageRectWidth;
create_info.height = view_config.recommendedImageRectHeight;
create_info.faceCount = 1;
create_info.arraySize = 1;
create_info.mipCount = 1;
CHECK_XR(xrCreateSwapchain(session, &create_info, &m_oxr->swapchain),
"Failed to create OpenXR swapchain.");
m_image_width = create_info.width;
m_image_height = create_info.height;
m_oxr->swapchain_images = swapchain_images_create(m_oxr->swapchain, gpu_binding);
}
GHOST_XrSwapchain::GHOST_XrSwapchain(GHOST_XrSwapchain &&other)
: m_oxr(std::move(other.m_oxr)),
m_image_width(other.m_image_width),
m_image_height(other.m_image_height),
m_format(other.m_format),
m_is_srgb_buffer(other.m_is_srgb_buffer)
{
/* Prevent xrDestroySwapchain call for the moved out item. */
other.m_oxr = nullptr;
}
GHOST_XrSwapchain::~GHOST_XrSwapchain()
{
/* m_oxr may be NULL after move. */
if (m_oxr && m_oxr->swapchain != XR_NULL_HANDLE) {
CHECK_XR_ASSERT(xrDestroySwapchain(m_oxr->swapchain));
}
}
XrSwapchainImageBaseHeader *GHOST_XrSwapchain::acquireDrawableSwapchainImage()
{
XrSwapchainImageAcquireInfo acquire_info = {XR_TYPE_SWAPCHAIN_IMAGE_ACQUIRE_INFO};
XrSwapchainImageWaitInfo wait_info = {XR_TYPE_SWAPCHAIN_IMAGE_WAIT_INFO};
uint32_t image_idx;
CHECK_XR(xrAcquireSwapchainImage(m_oxr->swapchain, &acquire_info, &image_idx),
"Failed to acquire swapchain image for the VR session.");
wait_info.timeout = XR_INFINITE_DURATION;
CHECK_XR(xrWaitSwapchainImage(m_oxr->swapchain, &wait_info),
"Failed to acquire swapchain image for the VR session.");
return m_oxr->swapchain_images[image_idx];
}
void GHOST_XrSwapchain::updateCompositionLayerProjectViewSubImage(XrSwapchainSubImage &r_sub_image)
{
r_sub_image.swapchain = m_oxr->swapchain;
r_sub_image.imageRect.offset = {0, 0};
r_sub_image.imageRect.extent = {m_image_width, m_image_height};
}
GHOST_TXrSwapchainFormat GHOST_XrSwapchain::getFormat() const
{
return m_format;
}
bool GHOST_XrSwapchain::isBufferSRGB() const
{
return m_is_srgb_buffer;
}
void GHOST_XrSwapchain::releaseImage()
{
XrSwapchainImageReleaseInfo release_info = {XR_TYPE_SWAPCHAIN_IMAGE_RELEASE_INFO};
CHECK_XR(xrReleaseSwapchainImage(m_oxr->swapchain, &release_info),
"Failed to release swapchain image used to submit VR session frame.");
}
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