rhi: Improve the handling of HDR capable texture formats

Add some sort of autotest for both RGBA16F and the new RGB10A2. The
latter is introduced particularly because ideally we should have a
texture format that corresponds to the D3D/Vulkan swapchain color
buffer format with HDR10.

Change-Id: I1e1bbb7c7e32cb3db89275900811c0bcaeac39d6
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/gui/rhi/qrhi.cpp b/src/gui/rhi/qrhi.cpp
index 82c1de31f3..1585b4bbc0 100644
--- a/src/gui/rhi/qrhi.cpp
+++ b/src/gui/rhi/qrhi.cpp
@@ -2525,6 +2525,19 @@ bool QRhiRenderBuffer::createFrom(NativeRenderBuffer src)
 
     \value RGBA32F Four components, 32-bit float per component.
 
+    \value R16F One component, 16-bit float.
+
+    \value R32F One component, 32-bit float.
+
+    \value RGBA10A2 Four components, unsigned normalized 10 bit R, G, and B,
+    2-bit alpha. This is a packed format so native endianness applies. Note
+    that there is no BGR30A2: this format maps to DXGI_FORMAT_R10G10B10A2_UNORM
+    with D3D, MTLPixelFormatRGB10A2Unorm with Metal,
+    VK_FORMAT_A2B10G10R10_UNORM_PACK32 with Vulkan, and
+    GL_RGB10_A2/GL_RGB/GL_UNSIGNED_INT_2_10_10_10_REV on OpenGL (ES). This is
+    the only universally supported RGB30 option. The corresponding QImage
+    formats are QImage::Format_BGR30 and QImage::Format_A2BGR30_Premultiplied.
+
     \value D16 16-bit depth (normalized unsigned integer)
 
     \value D24 24-bit depth (normalized unsigned integer)
@@ -5032,6 +5045,10 @@ void QRhiImplementation::textureFormatInfo(QRhiTexture::Format format, const QSi
         bpc = 4;
         break;
 
+    case QRhiTexture::RGB10A2:
+        bpc = 4;
+        break;
+
     case QRhiTexture::D16:
         bpc = 2;
         break;