openglshader.h File Reference

Shader definitions for OpenGL osd class. More...

Go to the source code of this file.

Variables
const char *	rectVertexShader
const char *	rectFragmentShader
const char *	textureVertexShader
const char *	textureFragmentShader
const char *	textureFragmentShaderSwapBR
	In difference to the textureFragmentShader this one does a blue/red color component swap.
const char *	textVertexShader
const char *	textFragmentShader

Detailed Description

Shader definitions for OpenGL osd class.

Note

This code was originally authored by Stefan Braun (see README), but there was never set any copyright info.

Copyright

(c) 2025 by Andreas Baierl. All Rights Reserved.

License

AGPLv3

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

Definition in file openglshader.h.

Variable Documentation

rectFragmentShader

const char* rectFragmentShader

Initial value:

=
"#version 100 \n\
precision mediump float; \
varying vec4 rectCol; \
\
void main() \
{ \
    gl_FragColor = rectCol; \
} \
"

Definition at line 43 of file openglshader.h.

Referenced by cOglShader::Load().

rectVertexShader

const char* rectVertexShader

Initial value:

=
"#version 100 \n\
\
attribute vec2 position; \
varying vec4 rectCol; \
uniform vec4 inColor; \
uniform mat4 projection; \
\
void main() \
{ \
    gl_Position = projection * vec4(position.x, position.y, 0.0, 1.0); \
    rectCol = inColor; \
} \
"

Definition at line 28 of file openglshader.h.

Referenced by cOglShader::Load().

textFragmentShader

const char* textFragmentShader

Initial value:

=
"#version 100 \n\
precision mediump float; \
varying vec2 TexCoords; \
varying vec4 textColor; \
\
uniform sampler2D glyphTexture; \
\
void main() \
{  \
    vec4 sampled = vec4(1.0, 1.0, 1.0, texture2D(glyphTexture, TexCoords).r); \
    gl_FragColor = textColor * sampled; \
} \
"

Definition at line 158 of file openglshader.h.

Referenced by cOglShader::Load().

textureFragmentShader

const char* textureFragmentShader

Initial value:

=
"#version 100 \n\
precision mediump float; \
varying vec2 TexCoords; \
varying vec4 alphaValue; \
varying vec4 bColorValue; \
\
uniform sampler2D screenTexture; \
\
float clamp_to_border_factor (vec2 coords) \
{ \
    bvec2 out1 = greaterThan (coords, vec2 (1,1)); \
    bvec2 out2 = lessThan (coords, vec2 (0,0)); \
    bool do_clamp = (any (out1) || any (out2)); \
    return float (!do_clamp); \
} \
\
void main() \
{ \
    vec4 color = texture2D(screenTexture, TexCoords) * alphaValue; \
    float f = clamp_to_border_factor (TexCoords); \
    gl_FragColor = mix (bColorValue, color, f); \
} \
"

Definition at line 80 of file openglshader.h.

Referenced by cOglShader::Load().

textureFragmentShaderSwapBR

const char* textureFragmentShaderSwapBR

Initial value:

=
"#version 100 \n\
precision mediump float; \
varying vec2 TexCoords; \
varying vec4 alphaValue; \
varying vec4 bColorValue; \
\
uniform sampler2D screenTexture; \
\
float clamp_to_border_factor (vec2 coords) \
{ \
    bvec2 out1 = greaterThan (coords, vec2 (1,1)); \
    bvec2 out2 = lessThan (coords, vec2 (0,0)); \
    bool do_clamp = (any (out1) || any (out2)); \
    return float (!do_clamp); \
} \
\
void main() \
{ \
    vec4 color = texture2D(screenTexture, TexCoords) * alphaValue; \
    vec4 color_swapped = vec4(color.b, color.g, color.r, color.a); \
    float f = clamp_to_border_factor (TexCoords); \
    gl_FragColor = mix (bColorValue, color_swapped, f); \
} \
"

In difference to the textureFragmentShader this one does a blue/red color component swap.

Definition at line 109 of file openglshader.h.

Referenced by cOglShader::Load().

textureVertexShader

const char* textureVertexShader

Initial value:

=
"#version 100 \n\
\
attribute vec2 position; \
attribute vec2 texCoords; \
\
varying vec2 TexCoords; \
varying vec4 alphaValue;\
varying vec4 bColorValue;\
\
uniform vec4 bColor; \
uniform mat4 projection; \
uniform vec4 alpha; \
\
void main() \
{ \
    gl_Position = projection * vec4(position.x, position.y, 0.0, 1.0); \
    TexCoords = texCoords; \
    alphaValue = alpha; \
    bColorValue = bColor; \
} \
"

Definition at line 57 of file openglshader.h.

Referenced by cOglShader::Load().

textVertexShader

const char* textVertexShader

Initial value:

=
"#version 100 \n\
\
attribute vec2 position; \
attribute vec2 texCoords; \
\
varying vec2 TexCoords; \
varying vec4 textColor; \
\
uniform mat4 projection; \
uniform vec4 inColor; \
\
void main() \
{ \
    gl_Position = projection * vec4(position.x, position.y, 0.0, 1.0); \
    TexCoords = texCoords; \
    textColor = inColor; \
} \
"

Definition at line 138 of file openglshader.h.

Referenced by cOglShader::Load().