1 files changed, 124 insertions, 0 deletions
diff --git a/src/OpenGL/GLBackend/Font/FontShader.cs b/src/OpenGL/GLBackend/Font/FontShader.cs
new file mode 100644
index 00000000..c12c45c4
--- /dev/null
+++ b/src/OpenGL/GLBackend/Font/FontShader.cs
@@ -0,0 +1,124 @@
+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);
+		}
+	}
+}
+