rhi: Add support for 3D textures

Supported on OpenGL (and ES) 3.0+ and everywhere else.

Can also be a render target, targeting a single slice at a time.

Can be mipmapped, cannot be multisample.

Reading back a given slice from a 3D texture is left as a future
exercise, for now it is documented to be not supported.

Upload is going to be limited to one slice in one upload entry,
just like we specify one face or one miplevel for cubemap and
mipmapped textures.

This also involves some welcome hardening of how texture subresources
are described internally: as we no longer can count on a layer index
between 0..5 (as is the case with cubemaps), simply arrays with
MAX_LAYER==6 are no longer sufficient. Switch to sufficiently dynamic
data structures where applicable.

On Vulkan rendering to a slice needs Vulkan 1.1 (and 1.1 enabled on the
VkInstance).

Task-number: QTBUG-89703
Change-Id: Ide6c20124ec9201d94ffc339dd479cd1ece777b0
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/gui/rhi/qrhiprofiler.cpp b/src/gui/rhi/qrhiprofiler.cpp
index 364a247ea1..76798dc396 100644
--- a/src/gui/rhi/qrhiprofiler.cpp
+++ b/src/gui/rhi/qrhiprofiler.cpp
@@ -387,7 +387,7 @@ void QRhiProfilerPrivate::newRenderBuffer(QRhiRenderBuffer *rb, bool transientBa
     const QSize sz = rb->pixelSize();
     // just make up something, ds is likely D24S8 while color is RGBA8 or similar
     const QRhiTexture::Format assumedFormat = type == QRhiRenderBuffer::DepthStencil ? QRhiTexture::D32F : QRhiTexture::RGBA8;
-    quint32 byteSize = rhiDWhenEnabled->approxByteSizeForTexture(assumedFormat, sz, 1, 1);
+    quint32 byteSize = rhiDWhenEnabled->approxByteSizeForTexture(assumedFormat, sz, 1, 1, 1);
     if (sampleCount > 1)
         byteSize *= uint(sampleCount);
 
@@ -418,7 +418,8 @@ void QRhiProfilerPrivate::newTexture(QRhiTexture *tex, bool owns, int mipCount,
 
     const QRhiTexture::Format format = tex->format();
     const QSize sz = tex->pixelSize();
-    quint32 byteSize = rhiDWhenEnabled->approxByteSizeForTexture(format, sz, mipCount, layerCount);
+    const int depth = tex->depth();
+    quint32 byteSize = rhiDWhenEnabled->approxByteSizeForTexture(format, sz, depth, mipCount, layerCount);
     if (sampleCount > 1)
         byteSize *= uint(sampleCount);
 
@@ -470,7 +471,7 @@ void QRhiProfilerPrivate::resizeSwapChain(QRhiSwapChain *sc, int bufferCount, in
         return;
 
     const QSize sz = sc->currentPixelSize();
-    quint32 byteSize = rhiDWhenEnabled->approxByteSizeForTexture(QRhiTexture::BGRA8, sz, 1, 1);
+    quint32 byteSize = rhiDWhenEnabled->approxByteSizeForTexture(QRhiTexture::BGRA8, sz, 1, 1, 1);
     byteSize = byteSize * uint(bufferCount) + byteSize * uint(msaaBufferCount) * uint(sampleCount);
 
     startEntry(QRhiProfiler::ResizeSwapChain, ts.elapsed(), sc);