Add QRhiTexture::RG16 format

Those are needed to handle 16bit YUV formats in Qt Multimedia.

Change-Id: I39c67bf4fcf558487b7819ea38e578f99c12a3ed
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

src/gui/rhi/qrhi.cpp

@@ -2378,6 +2378,8 @@ QRhiResource::Type QRhiRenderBuffer::resourceType() const
 
     \value R16 One component, unsigned normalized 16 bit.
 
+    \value RG16 Two component, unsigned normalized 16 bit.
+
     \value RED_OR_ALPHA8 Either same as R8, or is a similar format with the component swizzled to alpha,
     depending on \l{QRhi::RedOrAlpha8IsRed}{RedOrAlpha8IsRed}.
 
@@ -4533,6 +4535,9 @@ void QRhiImplementation::textureFormatInfo(QRhiTexture::Format format, const QSi
     case QRhiTexture::R16:
         bpc = 2;
         break;
+    case QRhiTexture::RG16:
+        bpc = 4;
+        break;
     case QRhiTexture::RED_OR_ALPHA8:
         bpc = 1;
         break;

src/gui/rhi/qrhi_p.h

@@ -765,6 +765,7 @@ public:
         R8,
         RG8,
         R16,
+        RG16,
         RED_OR_ALPHA8,
 
         RGBA16F,

src/gui/rhi/qrhid3d11.cpp

@@ -1214,6 +1214,8 @@ static inline DXGI_FORMAT toD3DTextureFormat(QRhiTexture::Format format, QRhiTex
         return DXGI_FORMAT_R8G8_UNORM;
     case QRhiTexture::R16:
         return DXGI_FORMAT_R16_UNORM;
+    case QRhiTexture::RG16:
+        return DXGI_FORMAT_R16G16_UNORM;
     case QRhiTexture::RED_OR_ALPHA8:
         return DXGI_FORMAT_R8_UNORM;
 
@@ -1300,6 +1302,8 @@ static inline QRhiTexture::Format colorTextureFormatFromDxgiFormat(DXGI_FORMAT f
         return QRhiTexture::RG8;
     case DXGI_FORMAT_R16_UNORM:
         return QRhiTexture::R16;
+    case DXGI_FORMAT_R16G16_UNORM:
+        return QRhiTexture::RG16;
     default: // this cannot assert, must warn and return unknown
         qWarning("DXGI_FORMAT %d is not a recognized uncompressed color format", format);
         break;

src/gui/rhi/qrhigles2.cpp

@@ -160,6 +160,10 @@ QT_BEGIN_NAMESPACE
 #define GL_R16                            0x822A
 #endif
 
+#ifndef GL_RG16
+#define GL_RG16                           0x822C
+#endif
+
 #ifndef GL_RED
 #define GL_RED                            0x1903
 #endif
@@ -822,6 +826,12 @@ static inline void toGlTextureFormat(QRhiTexture::Format format, const QRhiGles2
         *glformat = GL_RED;
         *gltype = GL_UNSIGNED_SHORT;
         break;
+    case QRhiTexture::RG16:
+        *glintformat = GL_RG16;
+        *glsizedintformat = *glintformat;
+        *glformat = GL_RG;
+        *gltype = GL_UNSIGNED_SHORT;
+        break;
     case QRhiTexture::R8:
         *glintformat = GL_R8;
         *glsizedintformat = *glintformat;
@@ -926,6 +936,9 @@ bool QRhiGles2::isTextureFormatSupported(QRhiTexture::Format format, QRhiTexture
     case QRhiTexture::R16:
         return caps.r16Format;
 
+    case QRhiTexture::RG16:
+        return caps.r16Format;
+
     case QRhiTexture::RGBA16F:
     case QRhiTexture::RGBA32F:
         return caps.floatFormats;

src/gui/rhi/qrhimetal.mm

@@ -2348,6 +2348,8 @@ static inline MTLPixelFormat toMetalTextureFormat(QRhiTexture::Format format, QR
 #endif
     case QRhiTexture::R16:
         return MTLPixelFormatR16Unorm;
+    case QRhiTexture::RG16:
+        return MTLPixelFormatRG16Unorm;
     case QRhiTexture::RED_OR_ALPHA8:
         return MTLPixelFormatR8Unorm;
 

src/gui/rhi/qrhivulkan.cpp

@@ -886,6 +886,8 @@ static inline VkFormat toVkTextureFormat(QRhiTexture::Format format, QRhiTexture
         return srgb ? VK_FORMAT_R8G8_SRGB : VK_FORMAT_R8G8_UNORM;
     case QRhiTexture::R16:
         return VK_FORMAT_R16_UNORM;
+    case QRhiTexture::RG16:
+        return VK_FORMAT_R16G16_UNORM;
     case QRhiTexture::RED_OR_ALPHA8:
         return VK_FORMAT_R8_UNORM;
 
@@ -993,6 +995,8 @@ static inline QRhiTexture::Format colorTextureFormatFromVkFormat(VkFormat format
         return QRhiTexture::RG8;
     case VK_FORMAT_R16_UNORM:
         return QRhiTexture::R16;
+    case VK_FORMAT_R16G16_UNORM:
+        return QRhiTexture::RG16;
     default: // this cannot assert, must warn and return unknown
         qWarning("VkFormat %d is not a recognized uncompressed color format", format);
         break;