Remove StencilReferenceMode. Add SetStencilReference.

This moves the application of the stencil reference from the
DepthStencilState to Command::SetStencilReference

examples/HelloDepthStencil.cpp

@@ -170,10 +170,6 @@ void init() {
 		.SetInput(1, 6 * sizeof(float), nxt::InputStepMode::Vertex)
 		.GetResult();
 
-	auto depthStencilState = device.CreateDepthStencilStateBuilder()
-		.SetDepthEnabled(true)
-		.GetResult();
-
 	nxt::BindGroupLayout bgl = device.CreateBindGroupLayoutBuilder()
 		.SetBindingsType(nxt::ShaderStageBit::Vertex, nxt::BindingType::UniformBuffer, 0, 2)
 		.GetResult();
@@ -236,6 +232,12 @@ void init() {
 		.GetResult();
 
     CreateDefaultRenderPass(device, &renderpass, &framebuffer);
+
+	auto depthStencilState = device.CreateDepthStencilStateBuilder()
+		.SetDepthEnabled(true)
+		.SetStencilEnabled(false)
+		.GetResult();
+
     pipeline = device.CreatePipelineBuilder()
         .SetSubpass(renderpass, 0)
 		.SetLayout(pl)
@@ -249,8 +251,6 @@ void init() {
 		.SetDepthEnabled(true)
 		.SetDepthWrite(nxt::DepthWriteMode::Disabled)
 		.SetStencilEnabled(true)
-		.SetStencilReferenceMode(nxt::StencilReferenceMode::Static)
-		.SetStencilReference(nxt::Face::Both, 1)
 		.SetStencilCompareFunction(nxt::Face::Both, nxt::CompareFunction::Always)
 		.SetStencilOperation(nxt::Face::Both, nxt::StencilOperation::Keep, nxt::StencilOperation::Keep, nxt::StencilOperation::Replace)
 		.SetStencilMask(nxt::Face::Both, 0xff, 0xff)
@@ -269,8 +269,6 @@ void init() {
 		.SetDepthEnabled(true)
 		.SetDepthWrite(nxt::DepthWriteMode::Enabled)
 		.SetStencilEnabled(true)
-		.SetStencilReferenceMode(nxt::StencilReferenceMode::Static)
-		.SetStencilReference(nxt::Face::Both, 1)
 		.SetStencilCompareFunction(nxt::Face::Both, nxt::CompareFunction::Equal)
 		.SetStencilOperation(nxt::Face::Both, nxt::StencilOperation::Keep, nxt::StencilOperation::Keep, nxt::StencilOperation::Replace)
 		.SetStencilMask(nxt::Face::Both, 0xff, 0x00)
@@ -314,10 +312,12 @@ void frame() {
             .DrawElements(36, 1, 0, 0)
 
 			.SetPipeline(planePipeline)
+			.SetStencilReference(0x1, 0x1)
 			.SetVertexBuffers(0, 1, &planeBuffer, vertexBufferOffsets)
 			.DrawElements(6, 1, 0, 0)
 
 			.SetPipeline(reflectionPipeline)
+			.SetStencilReference(0x1, 0x1)
 			.SetVertexBuffers(0, 1, &vertexBuffer, vertexBufferOffsets)
 			.SetBindGroup(0, bindGroup[1])
 			.DrawElements(36, 1, 0, 0)

next.json

@@ -279,6 +279,13 @@
                     {"name": "first instance", "type": "uint32_t"}
                 ]
             },
+            {
+                "name": "set stencil reference",
+                "args": [
+                    {"name": "back reference", "type": "uint32_t"},
+                    {"name": "front reference", "type": "uint32_t"}
+                ]
+            },
             {
                 "name": "set bind group",
                 "args": [
@@ -465,12 +472,6 @@
                     {"name": "stencil enabled", "type": "bool"}
                 ]
             },
-            {
-                "name": "set stencil reference mode",
-                "args": [
-                    {"name": "reference mode", "type": "stencil reference mode"}
-                ]
-            },
             {
                 "name": "set stencil operation",
                 "args": [
@@ -494,13 +495,6 @@
                     {"name": "read mask", "type": "uint32_t"},
                     {"name": "write mask", "type": "uint32_t"}
                 ]
-            },
-            {
-                "name": "set stencil reference",
-                "args": [
-                    {"name": "face", "type": "face"},
-                    {"name": "reference", "type": "int"}
-                ]
             }
         ]
     },
@@ -788,13 +782,6 @@
             {"value": 4, "name": "compute"}
         ]
     },
-    "stencil reference mode": {
-        "category": "enum",
-        "values": [
-            {"value": 0, "name": "static"},
-            {"value": 1, "name": "dynamic"}
-        ]
-    },
     "stencil operation": {
         "category": "enum",
         "values": [
@@ -928,8 +915,5 @@
     },
     "bool": {
         "category": "native"
-    },
-    "int": {
-        "category": "native"
     }
 }

src/backend/common/CommandBuffer.cpp

@@ -110,6 +110,12 @@ namespace backend {
                         cmd->~SetPushConstantsCmd();
                     }
                     break;
+				case Command::SetStencilReference:
+					{
+						SetStencilReferenceCmd* cmd = commands->NextCommand<SetStencilReferenceCmd>();
+						cmd->~SetStencilReferenceCmd();
+					}
+					break;
                 case Command::SetBindGroup:
                     {
                         SetBindGroupCmd* cmd = commands->NextCommand<SetBindGroupCmd>();
@@ -564,6 +570,12 @@ namespace backend {
                     }
                     break;
                 
+                case Command::SetStencilReference:
+					{
+						SetStencilReferenceCmd* cmd = iterator.NextCommand<SetStencilReferenceCmd>();
+					}
+                    break;
+
                 case Command::SetBindGroup:
                     {
                         SetBindGroupCmd* cmd = iterator.NextCommand<SetBindGroupCmd>();
@@ -754,6 +766,13 @@ namespace backend {
         memcpy(values, data, count * sizeof(uint32_t));
     }
 
+    void CommandBufferBuilder::SetStencilReference(uint32_t backReference, uint32_t frontReference) {
+        SetStencilReferenceCmd* cmd = allocator.Allocate<SetStencilReferenceCmd>(Command::SetStencilReference);
+        new(cmd) SetStencilReferenceCmd;
+        cmd->backReference = backReference;
+        cmd->frontReference = frontReference;
+    }
+
     void CommandBufferBuilder::SetBindGroup(uint32_t groupIndex, BindGroupBase* group) {
         if (groupIndex >= kMaxBindGroups) {
             HandleError("Setting bind group over the max");

src/backend/common/CommandBuffer.h

@@ -68,6 +68,7 @@ namespace backend {
             void EndRenderPass();
             void SetPushConstants(nxt::ShaderStageBit stage, uint32_t offset, uint32_t count, const void* data);
             void SetPipeline(PipelineBase* pipeline);
+            void SetStencilReference(uint32_t backReference, uint32_t frontReference);
             void SetBindGroup(uint32_t groupIndex, BindGroupBase* group);
             void SetIndexBuffer(BufferBase* buffer, uint32_t offset, nxt::IndexFormat format);
 

src/backend/common/Commands.h

@@ -37,6 +37,7 @@ namespace backend {
         EndRenderPass,
         SetPipeline,
         SetPushConstants,
+        SetStencilReference,
         SetBindGroup,
         SetIndexBuffer,
         SetVertexBuffers,
@@ -94,6 +95,11 @@ namespace backend {
         uint32_t count;
     };
 
+    struct SetStencilReferenceCmd {
+        uint32_t backReference;
+        uint32_t frontReference;
+    };
+
     struct SetBindGroupCmd {
         uint32_t index;
         Ref<BindGroupBase> group;

src/backend/common/DepthStencilState.cpp

@@ -34,10 +34,6 @@ namespace backend {
 		return stencilEnabled;
 	}
 
-	nxt::StencilReferenceMode DepthStencilStateBase::GetStencilReferenceMode() const {
-		return referenceMode;
-	}
-
 	const DepthStencilStateBase::DepthInfo& DepthStencilStateBase::GetDepth() const {
 		return depthInfo;
 	}
@@ -79,10 +75,6 @@ namespace backend {
 		this->stencilEnabled = stencilEnabled;
 	}
 
-	void DepthStencilStateBuilder::SetStencilReferenceMode(nxt::StencilReferenceMode referenceMode) {
-		this->referenceMode = referenceMode;
-	}
-
     void DepthStencilStateBuilder::SetStencilOperation(nxt::Face face, nxt::StencilOperation stencilFail, 
             nxt::StencilOperation depthFail, nxt::StencilOperation stencilPass) {
         if (face & nxt::Face::Back) {
@@ -123,15 +115,4 @@ namespace backend {
 		}
     }
 	
-	void DepthStencilStateBuilder::SetStencilReference(nxt::Face face, int reference) {
-		if (face & nxt::Face::Back) {
-			auto& stencilInfo = stencilInfos[0];
-			stencilInfo.reference = reference;
-		}
-		if (face & nxt::Face::Front) {
-			auto& stencilInfo = stencilInfos[1];
-			stencilInfo.reference = reference;
-		}
-	}
-
 }

src/backend/common/DepthStencilState.h

@@ -40,19 +40,16 @@ namespace backend {
 				nxt::StencilOperation stencilPass = nxt::StencilOperation::Keep;
                 uint32_t readMask = 0xff;
                 uint32_t writeMask = 0xff;
-				int reference = 0;
             };
 
 			bool DepthIsEnabled() const;
 			bool StencilIsEnabled() const;
-			nxt::StencilReferenceMode GetStencilReferenceMode() const;
             const DepthInfo& GetDepth() const;
             const StencilInfo& GetStencil(nxt::Face face) const;
 
         private:
 			bool depthEnabled = false;
 			bool stencilEnabled = false;
-            nxt::StencilReferenceMode referenceMode = nxt::StencilReferenceMode::Static;
             DepthInfo depthInfo;
             StencilInfo stencilInfos[2];
     };
@@ -66,12 +63,10 @@ namespace backend {
 			void SetDepthCompareFunction(nxt::CompareFunction depthCompareFunction);
             void SetDepthWrite(nxt::DepthWriteMode depthWriteMode);
 			void SetStencilEnabled(bool stencilEnabled);
-            void SetStencilReferenceMode(nxt::StencilReferenceMode referenceMode);
             void SetStencilOperation(nxt::Face face, nxt::StencilOperation stencilFail, 
                     nxt::StencilOperation depthFail, nxt::StencilOperation stencilPass);
             void SetStencilCompareFunction(nxt::Face face, nxt::CompareFunction stencilCompareFunction);
             void SetStencilMask(nxt::Face face, uint32_t readMask, uint32_t writeMask);
-			void SetStencilReference(nxt::Face face, int reference);
 
         private:
             friend class DepthStencilStateBase;
@@ -80,7 +75,6 @@ namespace backend {
 
 			bool depthEnabled;
 			bool stencilEnabled;
-            nxt::StencilReferenceMode referenceMode;
             DepthStencilStateBase::DepthInfo depthInfo;
             DepthStencilStateBase::StencilInfo stencilInfos[2];
     };

src/backend/opengl/CommandBufferGL.cpp

@@ -178,6 +178,14 @@ namespace opengl {
                     }
                     break;
                 
+                case Command::SetStencilReference:
+                    {
+                        SetStencilReferenceCmd* cmd = commands.NextCommand<SetStencilReferenceCmd>();
+                        DepthStencilState* depthStencilState = ToBackend(lastPipeline->GetDepthStencilState());
+                        depthStencilState->ApplyStencilReferenceNow(cmd->backReference, cmd->frontReference);
+                    }
+					break;
+
                 case Command::SetBindGroup:
                     {
                         SetBindGroupCmd* cmd = commands.NextCommand<SetBindGroupCmd>();

src/backend/opengl/OpenGLBackend.cpp

@@ -184,12 +184,14 @@ namespace opengl {
         : BufferViewBase(builder), device(device) {
     }
 
+    // DepthStencilState
+
 	DepthStencilState::DepthStencilState(Device* device, DepthStencilStateBuilder* builder)
 		: DepthStencilStateBase(builder), device(device) {
 
 	}
 
-	void DepthStencilState::Apply() {
+	void DepthStencilState::ApplyNow() {
 		if (DepthIsEnabled()) {
 			glEnable(GL_DEPTH_TEST);
 			auto& depth = GetDepth();
@@ -210,30 +212,47 @@ namespace opengl {
 			glDisable(GL_DEPTH_TEST);
 		}
 
-		static const GLuint GL_FACES[2] = { GL_BACK, GL_FRONT };
-		static const nxt::Face NXT_FACES[2] = { nxt::Face::Back, nxt::Face::Front };
 		if (StencilIsEnabled()) {
 			glEnable(GL_STENCIL_TEST);
-			for (uint32_t i = 0; i < 2; ++i) {
+            auto& back = GetStencil(nxt::Face::Back);
-				auto& stencil = GetStencil(NXT_FACES[i]);
+            auto& front = GetStencil(nxt::Face::Front);
-				glStencilFuncSeparate(GL_FACES[i],
+
-					OpenGLCompareFunction(stencil.compareFunction),
+            glStencilOpSeparate(GL_BACK,
-					stencil.reference,
+                OpenGLStencilOperation(back.stencilFail),
-					stencil.readMask
+                OpenGLStencilOperation(back.depthFail),
-				);
+                OpenGLStencilOperation(back.stencilPass)
-				glStencilOpSeparate(GL_FACES[i],
+            );
-					OpenGLStencilOperation(stencil.stencilFail),
+            glStencilOpSeparate(GL_FRONT,
-					OpenGLStencilOperation(stencil.depthFail),
+                OpenGLStencilOperation(front.stencilFail),
-					OpenGLStencilOperation(stencil.stencilPass)
+                OpenGLStencilOperation(front.depthFail),
-				);
+                OpenGLStencilOperation(front.stencilPass)
-				glStencilMaskSeparate(GL_FACES[i], stencil.writeMask);
+            );
-			}
+
+			glStencilMaskSeparate(GL_BACK, back.writeMask);
+            glStencilMaskSeparate(GL_FRONT, front.writeMask);
 		}
 		else {
 			glDisable(GL_STENCIL_TEST);
 		}
 	}
 
+    void DepthStencilState::ApplyStencilReferenceNow(uint32_t backReference, uint32_t frontReference) {
+        if (StencilIsEnabled()) {
+            auto& back = GetStencil(nxt::Face::Back);
+            auto& front = GetStencil(nxt::Face::Front);
+            glStencilFuncSeparate(GL_BACK,
+                OpenGLCompareFunction(back.compareFunction),
+                backReference,
+                back.readMask
+            );
+            glStencilFuncSeparate(GL_FRONT,
+                OpenGLCompareFunction(front.compareFunction),
+                frontReference,
+                front.readMask
+            );
+        }
+    }
+
     // InputState
 
     InputState::InputState(Device* device, InputStateBuilder* builder)

src/backend/opengl/OpenGLBackend.h

@@ -139,7 +139,8 @@ namespace opengl {
 	class DepthStencilState : public DepthStencilStateBase {
 		public:
 			DepthStencilState(Device* device, DepthStencilStateBuilder* builder);
-			void Apply();
+			void ApplyNow();
+            void ApplyStencilReferenceNow(uint32_t backReference, uint32_t frontReference);
 
 		private:
 			Device* device;

src/backend/opengl/PipelineGL.cpp

@@ -208,7 +208,7 @@ namespace opengl {
         auto inputState = ToBackend(GetInputState());
         glBindVertexArray(inputState->GetVAO());
         auto depthStencilState = ToBackend(GetDepthStencilState());
-        depthStencilState->Apply();
+        depthStencilState->ApplyNow();
     }
 
 }