Question

我的代码有问题:( OpenGL 4.1核心上下文，我正在使用VertexArrayObjects）

//This is a member method, vertexArrayObject and vertexBufferObject are of course generated using glGenVertexArrays & glGenBuffers
glBindVertexArray(vertexArrayObject);
glBindBuffer(GL_ARRAY_BUFFER, vertexBufferObject);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(float) * 8, 0);
Draw::debugLogGLError(); // OpenGL Error #0
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(float) * 8, (void*)(sizeof(float) * 3));
Draw::debugLogGLError(); // OpenGL Error #1282
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 8, (void*)(sizeof(float) * 6));
Draw::debugLogGLError(); // OpenGL Error #1282
glBindVertexArray(0);

Draw :: debugLogGLError（）只是将最新的错误代码输出到控制台

void Draw::debugLogGLError(void){
     std::cout << "OpenGL Error #" << glGetError() << std::endl;
}

如果我删除偏移量(void*)(sizeof(float) * 3)，它就会运行得很好。所以我假设(void*)有问题。然而，在我开始在课堂上实现它之前，它工作得很好。我可能错过了一些代码

OS：Mavericks，HD5000，Xcode中的Clang编译器

Answer 1

根据http://www.opengl.org/wiki/GLAPI/glVertexAttribPointer：

GL_INVALID_OPERATION is generated if size is GL_BGRA and type is not GL_UNSIGNED_BYTE, GL_INT_2_10_10_10_REV or GL_UNSIGNED_INT_2_10_10_10_REV.
GL_INVALID_OPERATION is generated if type is GL_INT_2_10_10_10_REV or GL_UNSIGNED_INT_2_10_10_10_REV and size is not 4 or GL_BGRA.
GL_INVALID_OPERATION is generated if type is GL_UNSIGNED_INT_10F_11F_11F_REV and size is not 3.
GL_INVALID_OPERATION is generated by glVertexAttribPointer if size is GL_BGRA and noramlized is GL_FALSE.
GL_INVALID_OPERATION is generated if zero is bound to the GL_ARRAY_BUFFER buffer object binding point and the pointer argument is not NULL.
GL_INVALID_OPERATION is generated if no vertex array object is bound.

前4个显然不是这样，所以它必须是最后的2个之一。最后一个不可能是这种情况，因为它并不总是抛出错误，最后一个会。所以根据维基的问题是：

GL_INVALID_OPERATION is generated if zero is bound to the GL_ARRAY_BUFFER buffer object binding point and the pointer argument is not NULL.

这意味着代码中的vertexBufferObject为0，因此不是有效的缓冲区对象。如果不是这种情况，我认为你偶然发现了一个主要的驱动程序错误。

glVertexAttribPointer（Offset？）给出了GL_INVALID_OPERATION

1 个答案: