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2025-09-04 10:54:47 +08:00
commit 6bc8f61b18
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+/* Copyright (c) 2023, Mobica Limited
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#version 450
+
+layout(binding = 1) uniform UBOTessellation
+{
+	float tessellationFactor;
+}
+ubo_tessellation;
+
+layout(vertices = 3) out;
+
+layout(location = 0) in vec3 inPos[];
+layout(location = 1) in vec3 inNormal[];
+
+layout(location = 0) out vec3 outPos[3];
+layout(location = 1) out vec3 outNormal[3];
+
+void main()
+{
+	if (gl_InvocationID == 0)
+	{
+		if (ubo_tessellation.tessellationFactor > 0.0)
+		{
+			gl_TessLevelInner[0] = ubo_tessellation.tessellationFactor;
+			gl_TessLevelInner[1] = ubo_tessellation.tessellationFactor;
+			gl_TessLevelOuter[0] = ubo_tessellation.tessellationFactor;
+			gl_TessLevelOuter[1] = ubo_tessellation.tessellationFactor;
+			gl_TessLevelOuter[2] = ubo_tessellation.tessellationFactor;
+			gl_TessLevelOuter[3] = ubo_tessellation.tessellationFactor;
+		}
+		else
+		{
+			gl_TessLevelInner[0] = 1;
+			gl_TessLevelInner[1] = 1;
+			gl_TessLevelOuter[0] = 1;
+			gl_TessLevelOuter[1] = 1;
+			gl_TessLevelOuter[2] = 1;
+			gl_TessLevelOuter[3] = 1;
+		}
+	}
+
+	gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
+	outNormal[gl_InvocationID]          = inNormal[gl_InvocationID];
+	outPos[gl_InvocationID]             = inPos[gl_InvocationID];
+}