Android 设备上的 OpenGLES 3.0 着色器编译错误，用于输入和输出存储限定符

Question

所以我正在更新我的应用程序以使用 OpenGLES 3.0 来利用变换反馈，但着色器没有编译。

错误：

06-27 17:29:43.299  18593-18627/com.harmonicprocesses.penelopefree E/MyGLRenderer﹕ Could not compile shader 35633:
06-27 17:29:43.299  18593-18627/com.harmonicprocesses.penelopefree E/MyGLRenderer﹕ ERROR: 0:1: 'in' : Syntax error:  syntax error
INTERNAL ERROR: no main() function!
ERROR: 1 compilation errors.  No code generated.

这是顶点着色器代码：

    private final String vertexShaderSrc =
        "in float inValue;" +
        "out float outValue;" +

        "void main() {" +
        "    outValue = sqrt(inValue);" +
        "}";

编译代码如下：

        int vertexShader = MyGLRenderer.loadShader(GLES30.GL_VERTEX_SHADER,
            vertexShaderSrc);

...

    public static int loadShader(int shaderType, String source) {
    int shader = GLES30.glCreateShader(shaderType);
    if (shader != 0) {
        GLES30.glShaderSource(shader, source);
        GLES30.glCompileShader(shader);
        int[] compiled = new int[1];
        GLES30.glGetShaderiv(shader, GLES30.GL_COMPILE_STATUS, compiled, 0);
        if (compiled[0] == 0) {
            Log.e(TAG, "Could not compile shader " + shaderType + ":");
            Log.e(TAG, GLES30.glGetShaderInfoLog(shader));
            GLES30.glDeleteShader(shader);
            shader = 0;
        }
    }
    return shader;
}

有人看出这有什么问题吗？如果我将 in 和 out 分别更改为 attribute varying 它不会抛出错误，但 glUseProgram 会抛出 gl 错误 1282 "Invalid Operation"。

这是我为 es 3.0 版设置 GL 的方式：

public MyGLSurfaceViewLegacy(Context context) {
    super(context);
    setListenForTouchOnTouchListener();
    NoteSpectrum = DSPEngine.staticCalcNoteBins(AudioConstants.defaultBufferSize*2, 
            AudioConstants.sampleRate);
    // Create an OpenGL ES 2.0 context.
    setEGLContextClientVersion(3);
    // Set the Renderer for drawing on the GLSurfaceView
    mRenderer = new MyGLRenderer(context,this);
    setEGLConfigChooser(8, 8, 8, 8, 16, 0);
    mContextFactory = new MyContextFactory();
    setEGLContextFactory(mContextFactory);
    //mEGLWindowSurfaceFactory = new MyEGLWindowSurfaceFactory();
    //setEGLWindowSurfaceFactory(mEGLWindowSurfaceFactory);
    setRenderer(mRenderer);
    getHolder().setFormat(PixelFormat.TRANSLUCENT);

    // Render the view only when there is a change in the drawing data
    setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);



    mContext = context;


    drawOverlay = PreferenceManager.getDefaultSharedPreferences(mContext)
            .getBoolean("turn_on_visualization_key",true);
}


class MyContextFactory implements EGLContextFactory {
private int EGL_CONTEXT_CLIENT_VERSION = 0x3098;
private EGLContext mEGLContext;
private EGLDisplay mEGLDisplay;
private MyGLSurfaceView mMyGLSurfaceView;
private EGL10 mEGL;

@Override
public EGLContext createContext(EGL10 egl, EGLDisplay display,
        EGLConfig eglConfig) {
    int[] attrib_list = {EGL_CONTEXT_CLIENT_VERSION, 3,
            EGL10.EGL_NONE };
    mEGL = egl;
    mEGLContext = egl.eglGetCurrentContext();
    mEGLDisplay = display;
    mEGLContext = egl.eglCreateContext(display, eglConfig, 
            egl.eglGetCurrentContext(), attrib_list);
    return mEGLContext;
}

Answer 1

将 OpenGLES 3.0 版本说明符添加到着色器的开头：

#version 300 es

还要确保您在 GLSurfaceView 设置代码中调用了 setEGLContextClientVersion(3)。

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