cleanup and refactoring

raytracer/ray_tracing_gltf/shaders/passthrough.vert

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2019-2021, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * 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.
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2019-2021 NVIDIA CORPORATION
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#version 450
+layout(location = 0) out vec2 outUV;
+
+
+out gl_PerVertex
+{
+  vec4 gl_Position;
+};
+
+
+void main()
+{
+  outUV       = vec2((gl_VertexIndex << 1) & 2, gl_VertexIndex & 2);
+  gl_Position = vec4(outUV * 2.0f - 1.0f, 1.0f, 1.0f);
+}