- convert triangle fan to triangle list on macOS

src/rendering/vulkan/renderer/vk_renderstate.cpp

@@ -614,3 +614,34 @@ void VkRenderState::EndFrame()
 	mStreamDataOffset = 0;
 	mDataIndex = -1;
 }
+
+/////////////////////////////////////////////////////////////////////////////
+
+void VkRenderStateMolten::Draw(int dt, int index, int count, bool apply)
+{
+	if (dt == DT_TriangleFan)
+	{
+		IIndexBuffer *oldIndexBuffer = mIndexBuffer;
+		mIndexBuffer = GetVulkanFrameBuffer()->FanToTrisIndexBuffer.get();
+
+		if (apply || mNeedApply)
+			Apply(DT_Triangles);
+		else
+			ApplyVertexBuffers();
+
+		drawcalls.Clock();
+		mCommandBuffer->drawIndexed((count - 2) * 3, 1, 0, index, 0);
+		drawcalls.Unclock();
+
+		mIndexBuffer = oldIndexBuffer;
+	}
+	else
+	{
+		if (apply || mNeedApply)
+			Apply(dt);
+
+		drawcalls.Clock();
+		mCommandBuffer->draw(count, 1, index, 0);
+		drawcalls.Unclock();
+	}
+}

src/rendering/vulkan/renderer/vk_renderstate.h

@@ -17,6 +17,7 @@ class VkRenderState : public FRenderState
 {
 public:
 	VkRenderState();
+	virtual ~VkRenderState() = default;
 
 	// Draw commands
 	void ClearScreen() override;
@@ -45,7 +46,7 @@ public:
 	void EndRenderPass();
 	void EndFrame();
 
-private:
+protected:
 	void Apply(int dt);
 	void ApplyRenderPass(int dt);
 	void ApplyStencilRef();
@@ -106,3 +107,11 @@ private:
 	bool mLastModelMatrixEnabled = true;
 	bool mLastTextureMatrixEnabled = true;
 };
+
+class VkRenderStateMolten : public VkRenderState
+{
+public:
+	using VkRenderState::VkRenderState;
+
+	void Draw(int dt, int index, int count, bool apply = true) override;
+};

src/rendering/vulkan/system/vk_framebuffer.cpp

@@ -120,6 +120,8 @@ void VulkanFrameBuffer::InitializeState()
 	mViewpoints = new GLViewpointBuffer;
 	mLights = new FLightBuffer();
 
+	CreateFanToTrisIndexBuffer();
+
 	// To do: move this to HW renderer interface maybe?
 	MatricesUBO = (VKDataBuffer*)CreateDataBuffer(-1, false);
 	StreamUBO = (VKDataBuffer*)CreateDataBuffer(-1, false);
@@ -129,7 +131,11 @@ void VulkanFrameBuffer::InitializeState()
 	mShaderManager.reset(new VkShaderManager(device));
 	mSamplerManager.reset(new VkSamplerManager(device));
 	mRenderPassManager->Init();
+#ifdef __APPLE__
+	mRenderState.reset(new VkRenderStateMolten());
+#else
 	mRenderState.reset(new VkRenderState());
+#endif
 }
 
 void VulkanFrameBuffer::Update()
@@ -621,3 +627,17 @@ void VulkanFrameBuffer::PrintStartupLog()
 	Printf("Max. uniform buffer range: %d\n", limits.maxUniformBufferRange);
 	Printf("Min. uniform buffer offset alignment: %d\n", limits.minUniformBufferOffsetAlignment);
 }
+
+void VulkanFrameBuffer::CreateFanToTrisIndexBuffer()
+{
+	TArray<uint32_t> data;
+	for (int i = 2; i < 1000; i++)
+	{
+		data.Push(0);
+		data.Push(i - 1);
+		data.Push(i);
+	}
+
+	FanToTrisIndexBuffer.reset(CreateIndexBuffer());
+	FanToTrisIndexBuffer->SetData(sizeof(uint32_t) * data.Size(), data.Data());
+}

src/rendering/vulkan/system/vk_framebuffer.h

@@ -42,6 +42,8 @@ public:
 	VKDataBuffer *MatricesUBO = nullptr;
 	VKDataBuffer *StreamUBO = nullptr;
 
+	std::unique_ptr<IIndexBuffer> FanToTrisIndexBuffer;
+
 	std::vector<std::unique_ptr<VulkanBuffer>> mFrameDeleteList;
 
 	std::unique_ptr<SWSceneDrawer> swdrawer;
@@ -86,6 +88,7 @@ private:
 	sector_t *RenderViewpoint(FRenderViewpoint &mainvp, AActor * camera, IntRect * bounds, float fov, float ratio, float fovratio, bool mainview, bool toscreen);
 	void DrawScene(HWDrawInfo *di, int drawmode);
 	void PrintStartupLog();
+	void CreateFanToTrisIndexBuffer();
 
 	std::unique_ptr<VkShaderManager> mShaderManager;
 	std::unique_ptr<VkSamplerManager> mSamplerManager;