/*
 * MIT License
 *
 * Copyright (c) 2026 Mark Allyn
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * 02_text_description_vert.glsl
 * Author: Mark Allyn
 * Component: 02_text_description
 *
 * Vertex shader for FreeType glyph quad rendering.
 * Each vertex carries both its screen position and its texture coordinate
 * packed into a single vec4 to minimise attribute slots.
 */

#version 430 core

layout (location = 0) in vec4 vertex; // xy = screen position (pixels), zw = texture coords

out vec2 tex_coords;

uniform mat4 projection; // orthographic: maps pixel space to NDC for current viewport

void main() {
    gl_Position = projection * vec4(vertex.xy, 0.0, 1.0);
    tex_coords  = vertex.zw;
}