這個用於android的opengl es 2.o代碼有什麼問題嗎？

Question

我正在學習OpenGL ES 2 for Android的一本快速入門指南，學習opengl es 2.0 for android的教程。我在第3.5節，我的「編譯」代碼不會編譯。我已經檢查並進行了雙重檢查，但是我的代碼與本書相匹配。我搜索了SO和其他網站，但它似乎只是我有這個代碼有問題。我已經嘗試過使用AVD和jellybean物理設備，但我總是得到Compilation of shader failed以下是我正在編譯的代碼。

頂點編碼：

attribute vec4 a_Position; 
void main(){ 
gl_Position = a_Position; 
} 

片段編碼：

precision mediump float; 
uniform vec4 u_Color; 
void main(){ 
gl_FragColor = u_Color; 
} 

助手類定位該資源並編譯的OpenGL的代碼：

public class ShaderHelper { 

private static final String TAG = "ShaderHelper"; 

public static int compileVertexShader(String shaderCode){ 
    return compileShader(GL_VERTEX_SHADER, shaderCode); 
} 

public static int compileFragmentShader(String shaderCode){ 
    return compileShader(GL_FRAGMENT_SHADER, shaderCode); 
} 

public static int compileShader(int type, String shaderCode){ 
    final int shaderObjectId = glCreateShader(type); 
    if(shaderObjectId == 0){ 
     if(LoggerConfig.ON){ 
      Log.w(TAG, "Could not create new shader."); 

     } 
    } 

    final int[] compileStatus = new int[1]; 
    glGetShaderiv(shaderObjectId, GL_COMPILE_STATUS, compileStatus, 0); 

    if(LoggerConfig.ON){ 
     Log.v(TAG, "Results of compiling source:" + "\n" + shaderCode + "\n:" + glGetShaderInfoLog(shaderObjectId)); 
    } 

    if(compileStatus[0] == 0){ 
     glDeleteShader(shaderObjectId); 
     if(LoggerConfig.ON){ 
      Log.w(TAG, "Compilation of shader failed."); <--This is where I get notification that the code did not compile... 
     } 
     return 0; 
    } 
    return shaderObjectId; 
} 

public static int linkProgram(int vertexShaderId, int fragmentShaderId){ 
    final int programObjectId = glCreateProgram(); 
    if(programObjectId == 0){ 
     if (LoggerConfig.ON){ 
      Log.w(TAG, "Could not create new program."); 
     } 
     return 0; 
    } 
    glAttachShader(programObjectId, vertexShaderId); 
    glAttachShader(programObjectId, fragmentShaderId); 

    final int[] linkStatus = new int[1]; 
    glGetProgramiv(programObjectId, GL_LINK_STATUS, linkStatus, 0); 

    if(LoggerConfig.ON){ 
     Log.v(TAG, "Results of linking program:\n" + glGetProgramInfoLog(programObjectId)); 
    } 

    if(linkStatus[0] == 0){ 
     glDeleteProgram(programObjectId); 
     if(LoggerConfig.ON){ 
      Log.w(TAG, "Linking of program failed."); 
     } 
     return 0; 
    } 

    return programObjectId; 
} 

public static boolean validateProgram(int programObjectId){ 
    glValidateProgram(programObjectId); 

    final int[] validateStatus = new int[1]; 
    glGetProgramiv(programObjectId, GL_VALIDATE_STATUS, validateStatus, 0); 
    Log.v(TAG, "Results of validating program: " + "\nLog:" + glGetProgramInfoLog(programObjectId)); 
    return validateStatus[0] != 0; 
} 

}

Answer 1

找到了一些本書中的錯誤，在後面的章節中增加了額外的代碼行，這些代碼使以前的版本能夠工作。