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using System;
using OpenTK.Graphics.OpenGL;
namespace go.GLBackend
{
public class FontShader : Shader
{
protected int coef1Location, coef2Location, coef3Location, coefALocation;
public float coef1 {
set {GL.Uniform1 (coef1Location, value);}
}
public float coef2 {
set {GL.Uniform1 (coef2Location, value);}
}
public float coef3 {
set {GL.Uniform1 (coef3Location, value);}
}
public float coefA {
set {GL.Uniform1 (coefALocation, value);}
}
public FontShader ()
{
vertSource = @"
#version 130
precision highp float;
uniform mat4 projection_matrix;
uniform mat4 modelview_matrix;
in vec2 in_position;
in vec2 in_tex;
out vec2 texCoord;
void main(void)
{
texCoord = in_tex;
gl_Position = projection_matrix * modelview_matrix * vec4(in_position,0, 1);
}";
fragSource = @"
#version 130
precision highp float;
uniform vec4 color;
uniform sampler2D tex;
uniform sampler2D backTex;
uniform sampler2D stencil;
uniform vec2 resolution;
uniform float coef1;
uniform float coef2;
uniform float coef3;
uniform float coefA;
in vec2 texCoord;
out vec4 out_frag_color;
void main(void)
{
vec2 uv = gl_FragCoord.xy / resolution;
vec2 pix = 1.0 / resolution;
float c = texture( tex, texCoord).r;
vec4 bc = texture( backTex, uv);
vec4 diff = bc - color;
if (c==0.)
discard;
// if (c > 0.75)
// out_frag_color = vec4(color.rgb,c);
// else{
float p = texture( tex, texCoord + vec2(-pix.x,0)).r;
float n = texture( tex, texCoord + vec2( pix.x,0)).r;
vec3 current = vec3(0,0,0);
float a = n - c;
current.r += coef1 * a * diff.r;
current.g += coef2 * a * diff.g;
current.b += coef3 * a * diff.b;
//current.a *= coefA * a * diff.a;
a = p - c;
current.r += coef3 * a * diff.r;
current.g += coef2 * a * diff.g;
current.b += coef1 * a * diff.b;
//current.a *= coefA * a * diff.a;
out_frag_color = vec4(color.rgb+current,c*coefA);
// }
}";
Compile ();
}
protected override void GetUniformLocations ()
{
base.GetUniformLocations ();
coef1Location = GL.GetUniformLocation (pgmId, "coef1");
coef2Location = GL.GetUniformLocation (pgmId, "coef2");
coef3Location = GL.GetUniformLocation (pgmId, "coef3");
coefALocation = GL.GetUniformLocation (pgmId, "coefA");
}
protected override void BindVertexAttributes ()
{
base.BindVertexAttributes ();
GL.BindAttribLocation(pgmId, 1, "in_tex");
}
protected override void BindSamplesSlots ()
{
GL.Uniform1(GL.GetUniformLocation (pgmId, "tex"),0);
GL.Uniform1(GL.GetUniformLocation (pgmId, "backTex"),1);
//GL.Uniform1(GL.GetUniformLocation (pgmId, "stencil"),1);
}
}
}
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