Question

我是Android OpenGl2.0的新手。我在从.obj文件创建3D模型时遇到了一个问题。在渲染3D模型时，我得到了空白屏幕。分享下面的代码，

@Override
public void onSurfaceCreated(GL10 glUnused, EGLConfig config) 
{
    GLES20.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

    // Enable texture mapping
     GLES20.glEnable(GLES20.GL_TEXTURE_2D);

    // Position the eye in front of the origin.
    final float eyeX = 0.0f;
    final float eyeY = 0.0f;
    final float eyeZ = -0.5f;

    // We are looking toward the distance
    final float lookX = 0.0f;
    final float lookY = 0.0f;
    final float lookZ = -8.0f;

    // Set our up vector. This is where our head would be pointing were we holding the camera.
    final float upX = 0.0f;
    final float upY = 1.0f;
    final float upZ = 0.0f;

    Matrix.setLookAtM(mViewMatrix, 0, eyeX, eyeY, eyeZ, lookX, lookY, lookZ, upX, upY, upZ);        

    final String vertexShader = RawResourceReader.readTextFileFromRawResource(mActivityContext, R.raw.per_pixel_vertex_shader_tex_and_light);           
    final String fragmentShader = RawResourceReader.readTextFileFromRawResource(mActivityContext, R.raw.per_pixel_fragment_shader_tex_and_light);           

    final int vertexShaderHandle = ShaderHelper.compileShader(GLES20.GL_VERTEX_SHADER, vertexShader);       
    final int fragmentShaderHandle = ShaderHelper.compileShader(GLES20.GL_FRAGMENT_SHADER, fragmentShader);     

    mProgramHandle = ShaderHelper.createAndLinkProgram(vertexShaderHandle, fragmentShaderHandle, 
            new String[] {"a_Position",  "a_Normal", "a_TexCoordinate"});   

     // Load the texture
    mTextureDataHandle = TextureHelper.loadTexture(mActivityContext, R.drawable.bumpy_bricks_public_domain);

    // Initialize the accumulated rotation matrix
    Matrix.setIdentityM(mAccumulatedRotation, 0);
}

*加载纹理函数（）

        // Read in the resource
        final Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resourceId, options);

        // Bind to the texture in OpenGL
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandle[0]);

        // Set filtering
        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);

        // Load the bitmap into the bound texture.
        GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);

        // Recycle the bitmap, since its data has been loaded into OpenGL.
        bitmap.recycle();

渲染器的OnDrawFrame（） -

//将活动纹理单元设置为纹理单元0。 GLES20.glActiveTexture（GLES20.GL_TEXTURE0）;

    // Bind the texture to this unit.
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureDataHandle);

...

    GLES20.glUniform1i(mTextureUniformHandle, 0);

    // Pass in the position information
    mCubePositions.position(0);
    GLES20.glVertexAttribPointer(mPositionHandle, POSITION_DATA_SIZE_IN_ELEMENTS, GLES20.GL_FLOAT, false, 0, mCubePositions);
    GLES20.glEnableVertexAttribArray(mPositionHandle);

    // Pass in the normal information
    mCubeNormals.position(0);
    GLES20.glVertexAttribPointer(mNormalHandle, NORMAL_DATA_SIZE_IN_ELEMENTS, GLES20.GL_FLOAT, false, 0, mCubeNormals);
    GLES20.glEnableVertexAttribArray(mNormalHandle);

    // Pass in the texture information
    mCubeTextureCoordinates.position(0);
    GLES20.glVertexAttribPointer(mTextureCoordinateHandle, TEXTURE_DATA_SIZE_IN_ELEMENTS, GLES20.GL_FLOAT, false,
            0, mCubeTextureCoordinates);
    GLES20.glEnableVertexAttribArray(mTextureCoordinateHandle);

    GLES20.glDrawElements(GLES20.GL_TRIANGLE_STRIP ,m3DModel.getIndicesLength(), GLES20.GL_UNSIGNED_SHORT, m3DModel.getIndices());

如果有人有想法或知道这个问题，请给我回复，我没有得到我在代码中犯错误的地方，

OpenGl2.0 Android在渲染带纹理的3D模型时显示空白屏幕

0 个答案: