Android NDK GLThread

Question

我正在尝试使用NDK在Android中创建一个简单的动画，不幸的是我的代码抛出了Exception。

A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 16198 (GLThread 739)

我不知道这个错误是什么意思。

这些是我的一些代码。

Coin.cpp

void Coin::Render(GLuint textureId, GLuint positionHandle, GLuint texCoord, GLint matrixHandle, GLint samplerLoc) {
    // Bind the texture to this unit
    glBindTexture(GL_TEXTURE_2D, textureId);

    // Enable generic vertex attribute array
    glEnableVertexAttribArray(positionHandle);
    glEnableVertexAttribArray(texCoord);

    // Prepare the triangle coordinate data
    glVertexAttribPointer(positionHandle, 3, GL_FLOAT, GL_FALSE, 0, mVertices);
    // Prepare the texture coordinates
    glVertexAttribPointer(texCoord, 2, GL_FLOAT, GL_FALSE, 0, mUVCoord);
    // Apply the projection and view transformation
    glUniformMatrix4fv(matrixHandle, 1, GL_FALSE, 0);
    //  Set the sampler texture unit to 0, where we have saved the texture
    glUniform1i(samplerLoc, 0);

    // Draw the triangle
    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, mIndices);

    // Disable vertex array
    glDisableVertexAttribArray(positionHandle);
    glDisableVertexAttribArray(texCoord);
}

这就是我声明我的数组Coin对象的方式，我认为它看起来像Java中的ArrayList<Coin>。

CoinRenderer.h

vector<Coin> mCoinCollection;

这是错误抛出的部分，代码在没有coin.Render()或coin.translate()的情况下工作，但是如果我取消注释这段代码代码不起作用。

CoinRenderer.cpp

void CoinRenderer::drawCoin() {
    // glUseProgram(programHandle);
    glUseProgram(imageHandle);

    long slowTime = GLUtils::currentTimeMillis() % 100000L;
    int elapse = (int) ((0.01f) * (slowTime));

    for (int i = 0; i < mCoinCollection.size(); i++) {
        Coin coin = mCoinCollection[i];
        if (mCurrentTime < elapse) {
            //int nextCoinFace = coin.getNextCoinFace();
            //coin.setTextureId(textures[i]);
            // This is also the line where the error is throwing.
            //coin.translate(0.0f, 0.20f);
        }
        // This line where the error is throwing.
        coin.Render(coin.getTextureId(), mPositionHandle, mTexCoord, mMatrixHandle, mSamplerLoc);
    }

    if (!hasVisibleCoin()) {
        LOGD("All coins y < 0");
        glDeleteProgram(imageHandle);
    }

    mCurrentTime = elapse;
}

如果需要，这里有一些额外的代码。

CoinRenderer.kt

class CoinRenderer(private val context: Context) : GLSurfaceView.Renderer {

    override fun onDrawFrame(gl: GL10?) {
        nativeDrawFrame()
    }

    override fun onSurfaceChanged(gl: GL10?, width: Int, height: Int) {
        nativeSurfaceChange(width, height)
    }

    override fun onSurfaceCreated(gl: GL10?, config: EGLConfig?) {
        val assetManager = context.assets
        nativeSurfaceCreate(assetManager)
    }

    external fun nativeSurfaceCreate(assetManager: AssetManager)
    external fun nativeSurfaceChange(width: Int, height: Int)
    external fun nativeDrawFrame()
    external fun drawNewCoin(coinSize: Int)
    external fun nativeClearSurface(isClearSurface: Boolean)

    companion object {
        init {
            System.loadLibrary("coin-lib")
        }
    }
}

CoinGL.kt

class CoinGL(context: Context) : GLSurfaceView(context) {

    private var mRenderer : CoinRenderer? = null

    init {
        // Set openGL version
        setEGLContextClientVersion(2)

        setZOrderOnTop(true)
        setEGLConfigChooser(8, 8, 8, 8, 16, 0)
        holder.setFormat(PixelFormat.RGBA_8888)

        mRenderer = CoinRenderer(context)
        setRenderer(mRenderer)

        renderMode = RENDERMODE_CONTINUOUSLY
    }

    fun drawNewCoin(coinSize: Int) {
        queueEvent ({
            mRenderer?.drawNewCoin(coinSize)
            mRenderer?.nativeClearSurface(false)
        })
    }
}

PS：我只是Android OPENGL NDK或C ++中的新手，如果您发现或看到一些非常错误的声明或善意使用请向我解释。谢谢。

任何帮助将不胜感激。谢谢。

Answer 1

将vector<Coin> mCoinCollection;改为vector<Coin*> mCoinCollection;