source: trunk/tools/neercs/video/text.lolfx @ 1588 Tweet

-- GLSL.Vert --

#version 130

attribute vec2 in_Position;
attribute uint in_Char, in_Attr;

varying vec4 pass_Foreground;
varying vec4 pass_Background;
varying vec2 pass_UV;

uniform mat4 in_Transform;

void main()
{
    float u = float(in_Char & 0xfu) / 32.0 + 0.0;
    float v = float((in_Char >> 4u) & 0xfu) / 32.0 + 0.5;
    pass_UV = vec2(u, v);

    float A = float(in_Attr >> 29u) / 7.0;
    float B = float((in_Attr >> 25u) & 0xfu) / 15.0;
    float C = float((in_Attr >> 21u) & 0xfu) / 15.0;
    float D = float((in_Attr >> 18u) & 0x7u) / 7.0;

    float E = float((in_Attr >> 15u) & 0x7u) / 7.0;
    float F = float((in_Attr >> 11u) & 0xfu) / 15.0;
    float G = float((in_Attr >> 7u) & 0xfu) / 15.0;
    float H = float((in_Attr >> 4u) & 0x7u) / 7.0;

    pass_Background = vec4(B, C, D, 1.0 - A);
    pass_Foreground = vec4(F, G, H, 1.0 - E);
    if (B + C + D < 0.01) A = 1.0;
    if (F + G + H < 0.01) E = 1.0;

    // This only works with glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
    //gl_PointSize = 40;

    gl_Position = in_Transform * vec4(in_Position, 0.0, 1.0);
}

-- GLSL.Frag --

#version 130

varying vec4 pass_Foreground;
varying vec4 pass_Background;
varying vec2 pass_UV;

uniform sampler2D in_Texture;

void main(void)
{
    vec2 c = gl_PointCoord * (1.0 / 32.0) + pass_UV;
    float t = texture2D(in_Texture, c).x;
    gl_FragColor = mix(pass_Background, pass_Foreground, t);
}