openglshader.h

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#ifndef __SOFTHDDEVICE_OPENGLSHADER_H
#define __SOFTHDDEVICE_OPENGLSHADER_H
 
/***********************************************************************
 * Rectangle shaders
 **********************************************************************/
const char *rectVertexShader =
"#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; \
} \
";
 
const char *rectFragmentShader =
"#version 100 \n\
precision mediump float; \
varying vec4 rectCol; \
\
void main() \
{ \
    gl_FragColor = rectCol; \
} \
";
 
/***********************************************************************
 * Texture shaders
 **********************************************************************/
const char *textureVertexShader =
"#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; \
} \
";
 
const char *textureFragmentShader =
"#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); \
} \
";
 
const char *textureFragmentShaderSwapBR =
"#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); \
} \
";
 
/***********************************************************************
 * Text shaders
 **********************************************************************/
const char *textVertexShader =
"#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; \
} \
";
 
const char *textFragmentShader =
"#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; \
} \
";
 
#endif