package shaders;
import box2dLight.RayHandler;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.glutils.ShaderProgram;
public class Gaussian {
public static ShaderProgram createBlurShader(int width, int heigth) {
final String FBO_W = Integer.toString(width);
final String FBO_H = Integer.toString(heigth);
final String rgb = RayHandler.isDiffuse ? ".rgb" : "";
final String vertexShader = "attribute vec4 a_position;\n" //
+ "uniform vec2 dir;\n" //
+ "attribute vec2 a_texCoord;\n" //
+ "varying vec2 v_texCoords0;\n" //
+ "varying vec2 v_texCoords1;\n" //
+ "varying vec2 v_texCoords2;\n" //
+ "varying vec2 v_texCoords3;\n" //
+ "varying vec2 v_texCoords4;\n" //
+ "#define FBO_W "
+ FBO_W
+ ".0\n"//
+ "#define FBO_H "
+ FBO_H
+ ".0\n"//
+ "const vec2 futher = vec2(3.2307692308 / FBO_W, 3.2307692308 / FBO_H );\n" //
+ "const vec2 closer = vec2(1.3846153846 / FBO_W, 1.3846153846 / FBO_H );\n" //
+ "void main()\n" //
+ "{\n" //
+ "vec2 f = futher * dir;\n" //
+ "vec2 c = closer * dir;\n" //
+ "v_texCoords0 = a_texCoord - f;\n" //
+ "v_texCoords1 = a_texCoord - c;\n" //
+ "v_texCoords2 = a_texCoord;\n" //
+ "v_texCoords3 = a_texCoord + c;\n" //
+ "v_texCoords4 = a_texCoord + f;\n" //
+ "gl_Position = a_position;\n" //
+ "}\n";
final String fragmentShader = "#ifdef GL_ES\n" //
+ "precision lowp float;\n" //
+ "#define MED mediump\n"
+ "#else\n"
+ "#define MED \n"
+ "#endif\n" //
+ "uniform sampler2D u_texture;\n" //
+ "varying MED vec2 v_texCoords0;\n" //
+ "varying MED vec2 v_texCoords1;\n" //
+ "varying MED vec2 v_texCoords2;\n" //
+ "varying MED vec2 v_texCoords3;\n" //
+ "varying MED vec2 v_texCoords4;\n" //
+ "const float center = 0.2270270270;\n" //
+ "const float close = 0.3162162162;\n" //
+ "const float far = 0.0702702703;\n" //
+ "void main()\n" //
+ "{ \n" //
+ "gl_FragColor"+rgb+" = far * texture2D(u_texture, v_texCoords0)"+rgb+"\n" //
+ " + close * texture2D(u_texture, v_texCoords1)"+rgb+"\n" //
+ " + center * texture2D(u_texture, v_texCoords2)"+rgb+"\n" //
+ " + close * texture2D(u_texture, v_texCoords3)"+rgb+"\n" //
+ " + far * texture2D(u_texture, v_texCoords4)"+rgb+";\n"//
+ "}\n";
ShaderProgram.pedantic = false;
ShaderProgram blurShader = new ShaderProgram(vertexShader,
fragmentShader);
if (blurShader.isCompiled() == false) {
Gdx.app.log("ERROR", blurShader.getLog());
}
return blurShader;
}
}