Add feature for per render target blending

Task-number: QTBUG-130334 Change-Id: I30ae0023ce8b5c26360e4255d64c209ebe404ede Reviewed-by: Laszlo Agocs <[email protected]>
isolovev · Nov 15, 2024 · c06c8eb · c06c8eb
1 parent 36dca3c
commit c06c8eb
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Showing 8 changed files with 21 additions and 2 deletions.
diff --git a/src/gui/rhi/qrhi.cpp b/src/gui/rhi/qrhi.cpp
@@ -1069,6 +1069,11 @@ Q_STATIC_LOGGING_CATEGORY(QRHI_LOG_RUB, "qt.rhi.rub")
     specification of the shading rate is supported via regular textures. In
     practice this may be supported with Direct 3D 12 and Vulkan. This enum value
     has been introduced in Qt 6.9.
+
+    \value PerRenderTargetBlending Indicates that per rendertarget blending is
+    supported i.e. different render targets in MRT framebuffer can have different
+    blending modes. Currently always returns false for OpenGL.
+    This enum value has been introduced in Qt 6.9.
  */
 
 /*!

diff --git a/src/gui/rhi/qrhi.h b/src/gui/rhi/qrhi.h
@@ -1907,7 +1907,8 @@ class Q_GUI_EXPORT QRhi
         ResolveDepthStencil,
         VariableRateShading,
         VariableRateShadingMap,
-        VariableRateShadingMapWithTexture
+        VariableRateShadingMapWithTexture,
+        PerRenderTargetBlending,
     };
 
     enum BeginFrameFlag {

diff --git a/src/gui/rhi/qrhid3d11.cpp b/src/gui/rhi/qrhid3d11.cpp
@@ -656,6 +656,8 @@ bool QRhiD3D11::isFeatureSupported(QRhi::Feature feature) const
     case QRhi::VariableRateShadingMap:
     case QRhi::VariableRateShadingMapWithTexture:
         return false;
+    case QRhi::PerRenderTargetBlending:
+        return true;
     default:
         Q_UNREACHABLE();
         return false;

diff --git a/src/gui/rhi/qrhid3d12.cpp b/src/gui/rhi/qrhid3d12.cpp
@@ -807,6 +807,8 @@ bool QRhiD3D12::isFeatureSupported(QRhi::Feature feature) const
     case QRhi::VariableRateShadingMap:
     case QRhi::VariableRateShadingMapWithTexture:
         return caps.vrsMap;
+    case QRhi::PerRenderTargetBlending:
+        return true;
     }
     return false;
 }

diff --git a/src/gui/rhi/qrhigles2.cpp b/src/gui/rhi/qrhigles2.cpp
@@ -1117,6 +1117,7 @@ bool QRhiGles2::create(QRhi::Flags flags)
     }
 
     caps.unpackRowLength = !caps.gles || caps.ctxMajor >= 3;
+    caps.perRenderTargetBlending = false;
 
     nativeHandlesStruct.context = ctx;
 
@@ -1507,6 +1508,8 @@ bool QRhiGles2::isFeatureSupported(QRhi::Feature feature) const
     case QRhi::VariableRateShadingMap:
     case QRhi::VariableRateShadingMapWithTexture:
         return false;
+    case QRhi::PerRenderTargetBlending:
+        return caps.perRenderTargetBlending;
     default:
         Q_UNREACHABLE_RETURN(false);
     }

diff --git a/src/gui/rhi/qrhigles2_p.h b/src/gui/rhi/qrhigles2_p.h
@@ -1025,7 +1025,8 @@ class QRhiGles2 : public QRhiImplementation
               objectLabel(false),
               glesMultisampleRenderToTexture(false),
               glesMultiviewMultisampleRenderToTexture(false),
-              unpackRowLength(false)
+              unpackRowLength(false),
+              perRenderTargetBlending(false)
         { }
         int ctxMajor;
         int ctxMinor;
@@ -1085,6 +1086,7 @@ class QRhiGles2 : public QRhiImplementation
         uint glesMultisampleRenderToTexture : 1;
         uint glesMultiviewMultisampleRenderToTexture : 1;
         uint unpackRowLength : 1;
+        uint perRenderTargetBlending : 1;
     } caps;
     QGles2SwapChain *currentSwapChain = nullptr;
     QSet<GLint> supportedCompressedFormats;

diff --git a/src/gui/rhi/qrhimetal.mm b/src/gui/rhi/qrhimetal.mm
@@ -867,6 +867,8 @@ inline Int aligned(Int v, Int byteAlign)
         return caps.shadingRateMap;
     case QRhi::VariableRateShadingMapWithTexture:
         return false;
+    case QRhi::PerRenderTargetBlending:
+        return true;
     default:
         Q_UNREACHABLE();
         return false;

diff --git a/src/gui/rhi/qrhivulkan.cpp b/src/gui/rhi/qrhivulkan.cpp
@@ -5202,6 +5202,8 @@ bool QRhiVulkan::isFeatureSupported(QRhi::Feature feature) const
     case QRhi::VariableRateShadingMap:
     case QRhi::VariableRateShadingMapWithTexture:
         return caps.renderPass2KHR && caps.imageBasedShadingRate;
+    case QRhi::PerRenderTargetBlending:
+        return true;
     default:
         Q_UNREACHABLE_RETURN(false);
     }