47 lines
1.7 KiB
GLSL
47 lines
1.7 KiB
GLSL
/*
|
||
* 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_frag.glsl
|
||
* Author: Mark Allyn
|
||
* Component: 02_text_description
|
||
*
|
||
* Fragment shader for FreeType glyph rendering.
|
||
* Glyphs are uploaded as GL_RED single-channel textures; the red channel
|
||
* drives the alpha so the background shows through unfilled pixels.
|
||
*/
|
||
|
||
#version 430 core
|
||
|
||
in vec2 tex_coords;
|
||
out vec4 frag_color;
|
||
|
||
uniform sampler2D text_sampler; // bound to texture unit 0
|
||
uniform vec3 text_color; // RGB, 0.0–1.0
|
||
|
||
void main() {
|
||
float alpha = texture(text_sampler, tex_coords).r;
|
||
frag_color = vec4(text_color, alpha);
|
||
}
|