fullscreenquad.vert.glsl

/*
 * Copyright (c) 2014-2021, 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) 2014-2021 NVIDIA CORPORATION
 * SPDX-License-Identifier: Apache-2.0
 */


#version 430
/**/

#extension GL_ARB_shading_language_include : enable
#include "common.h"

out vec2 texCoord;

void main()
{
  uint idx = gl_VertexID % 3; // allows rendering multiple fullscreen triangles
  vec4 pos =  vec4(
      (float( idx     &1U)) * 4.0 - 1.0,
      (float((idx>>1U)&1U)) * 4.0 - 1.0,
      0, 1.0);
  gl_Position = pos;
  texCoord = pos.xy * 0.5 + 0.5;
}