r3d/shaders/common/screen.vert

/*
 * Copyright (c) 2025 Le Juez Victor
 *
 * This software is provided "as-is", without any express or implied warranty. In no event
 * will the authors be held liable for any damages arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose, including commercial
 * applications, and to alter it and redistribute it freely, subject to the following restrictions:
 *
 *   1. The origin of this software must not be misrepresented; you must not claim that you
 *   wrote the original software. If you use this software in a product, an acknowledgment
 *   in the product documentation would be appreciated but is not required.
 *
 *   2. Altered source versions must be plainly marked as such, and must not be misrepresented
 *   as being the original software.
 *
 *   3. This notice may not be removed or altered from any source distribution.
 */

#version 330 core

const vec2 positions[3] = vec2[]
(
    vec2(-1.0, -1.0),
    vec2( 3.0, -1.0),
    vec2(-1.0,  3.0)
);

noperspective out vec2 vTexCoord;

void main()
{
    gl_Position = vec4(positions[gl_VertexID], 0.0, 1.0);
    vTexCoord = (gl_Position.xy * 0.5) + 0.5;
}