Android Open Source - Texample2 Batch Text Program

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Back to project page Texample2.

License

The source code is released under:

CC0 1.0 Universal http://creativecommons.org/publicdomain/zero/1.0/legalcode

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Java Source Code

package com.android.texample2.programs;
/*from ww w  .  j a va 2s .co m*/
import com.android.texample2.AttribVariable;



public class BatchTextProgram extends Program {

  private static final AttribVariable[] programVariables = {
    AttribVariable.A_Position, AttribVariable.A_TexCoordinate, AttribVariable.A_MVPMatrixIndex
  };
  
  private static final String vertexShaderCode =
      "uniform mat4 u_MVPMatrix[24];      \n"     // An array representing the combined 
                            // model/view/projection matrices for each sprite
      
      + "attribute float a_MVPMatrixIndex; \n"  // The index of the MVPMatrix of the particular sprite
      + "attribute vec4 a_Position;     \n"     // Per-vertex position information we will pass in.
      + "attribute vec2 a_TexCoordinate;\n"     // Per-vertex texture coordinate information we will pass in
      + "varying vec2 v_TexCoordinate;  \n"   // This will be passed into the fragment shader.
      + "void main()                    \n"     // The entry point for our vertex shader.
      + "{                              \n"
      + "   int mvpMatrixIndex = int(a_MVPMatrixIndex); \n"
      + "   v_TexCoordinate = a_TexCoordinate; \n"
      + "   gl_Position = u_MVPMatrix[mvpMatrixIndex]   \n"     // gl_Position is a special variable used to store the final position.
      + "               * a_Position;   \n"     // Multiply the vertex by the matrix to get the final point in
                            // normalized screen coordinates.
      + "}                              \n";    


  private static final String fragmentShaderCode =
      "uniform sampler2D u_Texture;       \n"    // The input texture.
      +  "precision mediump float;       \n"     // Set the default precision to medium. We don't need as high of a
          // precision in the fragment shader.
      + "uniform vec4 u_Color;          \n"
      + "varying vec2 v_TexCoordinate;  \n" // Interpolated texture coordinate per fragment.
      
      + "void main()                    \n"     // The entry point for our fragment shader.
      + "{                              \n"
      + "   gl_FragColor = texture2D(u_Texture, v_TexCoordinate).w * u_Color;\n" // texture is grayscale so take only grayscale value from  
                                             // it when computing color output (otherwise font is always black)
      + "}                             \n";

  @Override
  public void init() {
    super.init(vertexShaderCode, fragmentShaderCode, programVariables);
  }
  
}

Java Source Code List