6 files changed, 20 insertions, 2 deletions
diff --git a/src/gui/rhi/qrhi.cpp b/src/gui/rhi/qrhi.cpp
index e4f6da6d46..c8ec8c7410 100644
--- a/src/gui/rhi/qrhi.cpp
+++ b/src/gui/rhi/qrhi.cpp
@@ -563,7 +563,10 @@ Q_LOGGING_CATEGORY(QRHI_LOG_INFO, "qt.rhi.general")
     \value BaseInstance Indicates that instanced draw commands support the \c
     firstInstance argument. When reported as not supported, the firstInstance
     value is ignored and the instance ID starts from 0.
- */
+
+    \value TriangleFanTopology Indicates that QRhiGraphicsPipeline::setTopology()
+    supports QRhiGraphicsPipeline::TriangleFan.
+*/
 
 /*!
     \enum QRhi::BeginFrameFlag
@@ -3123,6 +3126,7 @@ QDebug operator<<(QDebug dbg, const QRhiShaderResourceBindings &srb)
 
     \value Triangles (default)
     \value TriangleStrip
+    \value TriangleFan (only available if QRhi::TriangleFanTopology is supported)
     \value Lines
     \value LineStrip
     \value Points
diff --git a/src/gui/rhi/qrhi_p.h b/src/gui/rhi/qrhi_p.h
index 95e9213cac..5b371af727 100644
--- a/src/gui/rhi/qrhi_p.h
+++ b/src/gui/rhi/qrhi_p.h
@@ -1017,6 +1017,7 @@ public:
     enum Topology {
         Triangles,
         TriangleStrip,
+        TriangleFan,
         Lines,
         LineStrip,
         Points
@@ -1426,7 +1427,8 @@ public:
         WideLines,
         VertexShaderPointSize,
         BaseVertex,
-        BaseInstance
+        BaseInstance,
+        TriangleFanTopology
     };
 
     enum BeginFrameFlag {
diff --git a/src/gui/rhi/qrhid3d11.cpp b/src/gui/rhi/qrhid3d11.cpp
index 36c95f2306..f011d68ada 100644
--- a/src/gui/rhi/qrhid3d11.cpp
+++ b/src/gui/rhi/qrhid3d11.cpp
@@ -469,6 +469,8 @@ bool QRhiD3D11::isFeatureSupported(QRhi::Feature feature) const
         return true;
     case QRhi::BaseInstance:
         return true;
+    case QRhi::TriangleFanTopology:
+        return false;
     default:
         Q_UNREACHABLE();
         return false;
diff --git a/src/gui/rhi/qrhigles2.cpp b/src/gui/rhi/qrhigles2.cpp
index 17b40777b3..277cf12fd2 100644
--- a/src/gui/rhi/qrhigles2.cpp
+++ b/src/gui/rhi/qrhigles2.cpp
@@ -732,6 +732,8 @@ bool QRhiGles2::isFeatureSupported(QRhi::Feature feature) const
         return caps.baseVertex;
     case QRhi::BaseInstance:
         return false; // not in ES 3.2, so won't bother
+    case QRhi::TriangleFanTopology:
+        return true;
     default:
         Q_UNREACHABLE();
         return false;
@@ -1539,6 +1541,8 @@ static inline GLenum toGlTopology(QRhiGraphicsPipeline::Topology t)
         return GL_TRIANGLES;
     case QRhiGraphicsPipeline::TriangleStrip:
         return GL_TRIANGLE_STRIP;
+    case QRhiGraphicsPipeline::TriangleFan:
+        return GL_TRIANGLE_FAN;
     case QRhiGraphicsPipeline::Lines:
         return GL_LINES;
     case QRhiGraphicsPipeline::LineStrip:
diff --git a/src/gui/rhi/qrhimetal.mm b/src/gui/rhi/qrhimetal.mm
index 344be44d48..f9d9cdc01a 100644
--- a/src/gui/rhi/qrhimetal.mm
+++ b/src/gui/rhi/qrhimetal.mm
@@ -550,6 +550,8 @@ bool QRhiMetal::isFeatureSupported(QRhi::Feature feature) const
         return true;
     case QRhi::BaseInstance:
         return true;
+    case QRhi::TriangleFanTopology:
+        return false;
     default:
         Q_UNREACHABLE();
         return false;
diff --git a/src/gui/rhi/qrhivulkan.cpp b/src/gui/rhi/qrhivulkan.cpp
index c7d28a4f18..cb32aa08f3 100644
--- a/src/gui/rhi/qrhivulkan.cpp
+++ b/src/gui/rhi/qrhivulkan.cpp
@@ -3727,6 +3727,8 @@ bool QRhiVulkan::isFeatureSupported(QRhi::Feature feature) const
         return true;
     case QRhi::BaseInstance:
         return true;
+    case QRhi::TriangleFanTopology:
+        return true;
     default:
         Q_UNREACHABLE();
         return false;
@@ -4572,6 +4574,8 @@ static inline VkPrimitiveTopology toVkTopology(QRhiGraphicsPipeline::Topology t)
         return VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
     case QRhiGraphicsPipeline::TriangleStrip:
         return VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP;
+    case QRhiGraphicsPipeline::TriangleFan:
+        return VK_PRIMITIVE_TOPOLOGY_TRIANGLE_FAN;
     case QRhiGraphicsPipeline::Lines:
         return VK_PRIMITIVE_TOPOLOGY_LINE_LIST;
     case QRhiGraphicsPipeline::LineStrip: