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rhi: gl: Enable depth texture for multiview

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Cannot just do like with other APIs and expose a view of multiple
array layers. The only option is to use the multiview-specific API
and specify layers 0..view_count-1 in the depth texture.

This allows having depth in a multiview render pass with OpenGL.
Note that this does not cover stencil. D24S8 does not work, so
we may need to explore having a dedicated, separate stencil
texture.

Task-number: QTBUG-114896
Change-Id: I06ede1d77fef199148d595a55d144c96dc3cbc9d
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
This commit is contained in:
Laszlo Agocs 2023-06-27 15:03:37 +02:00
parent 3b7f99d04c
commit 4b233526f2
2 changed files with 11 additions and 4 deletions
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13
src/gui/rhi/qrhigles2.cpp
View File

@ -5634,6 +5634,7 @@ bool QGles2TextureRenderTarget::create()
d.colorAttCount = 0;
int attIndex = 0;
int multiViewCount = 0;
for (auto it = m_desc.cbeginColorAttachments(), itEnd = m_desc.cendColorAttachments(); it != itEnd; ++it, ++attIndex) {
d.colorAttCount += 1;
const QRhiColorAttachment &colorAtt(*it);
@ -5644,10 +5645,11 @@ bool QGles2TextureRenderTarget::create()
QGles2Texture *texD = QRHI_RES(QGles2Texture, texture);
Q_ASSERT(texD->texture && texD->specified);
if (texD->flags().testFlag(QRhiTexture::ThreeDimensional) || texD->flags().testFlag(QRhiTexture::TextureArray)) {
if (it->multiViewCount() < 2) {
if (colorAtt.multiViewCount() < 2) {
rhiD->f->glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + uint(attIndex), texD->texture,
colorAtt.level(), colorAtt.layer());
} else {
multiViewCount = colorAtt.multiViewCount();
rhiD->glFramebufferTextureMultiviewOVR(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + uint(attIndex), texD->texture,
colorAtt.level(), colorAtt.layer(), colorAtt.multiViewCount());
}
@ -5696,8 +5698,13 @@ bool QGles2TextureRenderTarget::create()
}
} else {
QGles2Texture *depthTexD = QRHI_RES(QGles2Texture, m_desc.depthTexture());
rhiD->f->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, depthTexD->target,
depthTexD->texture, 0);
if (multiViewCount < 2) {
rhiD->f->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, depthTexD->target,
depthTexD->texture, 0);
} else {
rhiD->glFramebufferTextureMultiviewOVR(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, depthTexD->texture,
0, 0, multiViewCount);
}
if (d.colorAttCount == 0) {
d.pixelSize = depthTexD->pixelSize();
d.sampleCount = 1;

2
tests/manual/rhi/multiview/multiview.cpp
View File

@ -96,7 +96,7 @@ void Window::customInit()
// rendered with depth test/write enabled. The catch here is that we must
// use a texture array for depth/stencil as well, so QRhiRenderBuffer is
// not an option anymore.
d.ds = m_r->newTextureArray(QRhiTexture::D24S8, 2, QSize(512, 512), sampleCount, QRhiTexture::RenderTarget);
d.ds = m_r->newTextureArray(QRhiTexture::D24, 2, QSize(512, 512), sampleCount, QRhiTexture::RenderTarget);
d.releasePool << d.ds;
d.ds->create();