Opengl es OpenglES alpha纹理深度

缺陷图像改变深度-z， crown的透明区域现在工作正常

我如何才能正确地看到bug的背后？

您需要：

对精灵进行排序，使其在不进行深度测试的情况下从后向前渲染，并仅依靠混合来提供透明度

向片段着色器添加alpha测试，以删除透明的片段（例如，如果（alpha<0.05）丢弃；，根据需要调整透明度阈值）

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谢谢你的第二个答案很有效。首先是我想避免它

glClear( GL_COLOR_BUFFER_BIT |GL_DEPTH_BUFFER_BIT );

glUseProgram(_program);
GLKVector2 poz= { 0, 0};
if (_Sprite2)
{
    float aspect = ( GLfloat ) _screenWidth/ ( GLfloat ) _screenHeight;
    [self esMatrixLoadIdentity : &perspective];
    [self esPerspective:&perspective pos_fovy:60.0f pos_aspect:aspect  pos_nearZ:1.0f pos_farZ:30.0f];


    [self esMatrixLoadIdentity : &modelview];
    [self esTranslate : &modelview trans_x:0.0f trans_y:-0.5f trans_z:-5 ];
    [self esRotate : &modelview gl_angle:0.0f _x:1.0 _y:0.0 _z:1.0];
    [self esMatrixMultiply :&mvpMatrix src_A:&modelview src_B:&perspective];

    glUniformMatrix4fv ( mvpLoc, 1, GL_FALSE, (GLfloat*) &mvpMatrix.m[0][0] );

    [_Sprite2 update : poz];
    [_Sprite2 draw];
}/// crown

if(_sprite)//bug
{
    float aspect = ( GLfloat ) _screenWidth/ ( GLfloat ) _screenHeight;
    [self esMatrixLoadIdentity : &perspective];
    [self esPerspective:&perspective pos_fovy:60.0f pos_aspect:aspect  pos_nearZ:1.0f pos_farZ:30.0f];

    [self esMatrixLoadIdentity : &modelview];
    [self esTranslate : &modelview trans_x:0.0f trans_y:0.0f trans_z:_zPoz + _zPoz_2];
    [self esRotate : &modelview gl_angle:0.0f _x:1.0 _y:0.0 _z:1.0];

    [self esMatrixMultiply :&mvpMatrix src_A:&modelview src_B:&perspective];

    glUniformMatrix4fv ( mvpLoc, 1, GL_FALSE, (GLfloat*) &mvpMatrix.m[0][0] );

    [_sprite update : poz];
    [_sprite draw];
}