[英]Java Android OpenGL ES 2.0 Can't link program
我尝试将基本着色器程序与顶点和片段着色器链接。 两个着色器都可以成功编译,但是如果我尝试链接程序,则链接始终会失败。 怎么了,为什么链接失败了? 信息日志为空,但链接时出现GL_INVALID_OPERATION错误。 我从GLSurfaceView.Renderer接口的“ onSurfaceCreated”方法中运行MAIN代码。
主要:
String vertexShaderSource = "attribute vec4 a_Position; " +
"void main() " +
"{ " +
" gl_Position = a_Position; " +
"} ";
String fragmentShaderSource = "precision mediump float; " +
"void main() " +
"{ " +
" gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);" +
"} ";
int vertexShaderHandle = GLES20.glCreateShader(GLES20.GL_VERTEX_SHADER);
GLES20.glShaderSource(vertexShaderHandle, vertexShaderSource);
ShaderHelper.compileShader(vertexShaderHandle);
int fragmentShaderHandle = GLES20.glCreateShader(GLES20.GL_FRAGMENT_SHADER);
GLES20.glShaderSource(fragmentShaderHandle, fragmentShaderSource);
ShaderHelper.compileShader(fragmentShaderHandle);
programHandle = GLES20.glCreateProgram();
GLES20.glAttachShader(programHandle, vertexShaderHandle);
GLES20.glAttachShader(programHandle, fragmentShaderHandle);
ProgramHelper.linkProgram(fragmentShaderHandle);
帮手:
public static void compileShader(int shaderHandle)
{
GLES20.glCompileShader(shaderHandle);
int[] results = new int[1];
GLES20.glGetShaderiv(shaderHandle, GLES20.GL_COMPILE_STATUS, results, 0);
if(results[0] != GLES20.GL_TRUE)
{
String infoLog = GLES20.glGetShaderInfoLog(shaderHandle);
throw new RuntimeException("Failed to compile shader!" + '\n' + infoLog);
}
}
public static void linkProgram(int programHandle)
{
GLES20.glLinkProgram(programHandle);
int[] results = new int[1];
GLES20.glGetProgramiv(programHandle, GLES20.GL_LINK_STATUS, results, 0);
if(results[0] != GLES20.GL_TRUE)
{
String infoLog = GLES20.glGetProgramInfoLog(programHandle);
throw new RuntimeException("Failed to link program!" + '\n' + infoLog);
}
}
编辑:
WTF,如果我不使用helper方法进行链接,则程序可以很好地链接。 为什么???
您的代码将错误的参数传递给linkProgram()
方法:
programHandle = GLES20.glCreateProgram();
...
ProgramHelper.linkProgram(fragmentShaderHandle);
顾名思义, fragmentShaderHandle
是片段着色器对象。 要链接程序,您需要传递程序对象:
ProgramHelper.linkProgram(programHandle);
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