Android Open Source - DivisionByZero Shader Utils

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Back to project page DivisionByZero.

License

The source code is released under:

Apache License

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Java Source Code

package com.ggstudios.utils;
/*from   w  ww. jav a2  s.  c om*/
import android.opengl.GLES20;

public class ShaderUtils {
  /** 
   * Helper function to compile a shader.
   * 
   * @param shaderType The shader type.
   * @param shaderSource The shader source code.
   * @return An OpenGL handle to the shader.
   */
  public static int compileShader(final int shaderType, final String shaderSource) {
    int shaderHandle = GLES20.glCreateShader(shaderType);

    if (shaderHandle != 0) {
      // Pass in the shader source.
      GLES20.glShaderSource(shaderHandle, shaderSource);

      // Compile the shader.
      GLES20.glCompileShader(shaderHandle);

      // Get the compilation status.
      final int[] compileStatus = new int[1];
      GLES20.glGetShaderiv(shaderHandle, GLES20.GL_COMPILE_STATUS, compileStatus, 0);

      // If the compilation failed, delete the shader.
      if (compileStatus[0] == 0) {
        GLES20.glDeleteShader(shaderHandle);
        shaderHandle = 0;
        throw new RuntimeException("Error compiling shader: " + GLES20.glGetShaderInfoLog(shaderHandle));
      }
    }

    if (shaderHandle == 0) {      
      throw new RuntimeException("Error creating shader.");
    }

    return shaderHandle;
  }

  /**
   * Helper function to compile and link a program.
   * 
   * @param vertexShaderHandle An OpenGL handle to an already-compiled vertex shader.
   * @param fragmentShaderHandle An OpenGL handle to an already-compiled fragment shader.
   * @param attributes Attributes that need to be bound to the program.
   * @return An OpenGL handle to the program.
   */
  public static int createAndLinkProgram(final int vertexShaderHandle, final int fragmentShaderHandle, final String[] attributes) 
  {
    int programHandle = GLES20.glCreateProgram();

    if (programHandle != 0) {
      // Bind the vertex shader to the program.
      GLES20.glAttachShader(programHandle, vertexShaderHandle);      

      // Bind the fragment shader to the program.
      GLES20.glAttachShader(programHandle, fragmentShaderHandle);

      // Bind attributes
      if (attributes != null)
      {
        final int size = attributes.length;
        for (int i = 0; i < size; i++)
        {
          GLES20.glBindAttribLocation(programHandle, i, attributes[i]);
        }            
      }

      // Link the two shaders together into a program.
      GLES20.glLinkProgram(programHandle);

      // Get the link status.
      final int[] linkStatus = new int[1];
      GLES20.glGetProgramiv(programHandle, GLES20.GL_LINK_STATUS, linkStatus, 0);

      // If the link failed, delete the program.
      if (linkStatus[0] == 0) {  
        GLES20.glDeleteProgram(programHandle);
        programHandle = 0;
        throw new RuntimeException("Error compiling program: " + GLES20.glGetProgramInfoLog(programHandle));
      }
    }

    if (programHandle == 0) {
      throw new RuntimeException("Error creating program.");
    }

    return programHandle;
  }
}

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