例如,我有以下代码:
//Create a vbo and bind it to the GL_ARRAY_BUFFER
glGenBuffers(1, &positionBufferObject);
glBindBuffer(GL_ARRAY_BUFFER, positionBufferObject);
//vertexPosition is an array of floats that stores the position of 3 vertices (x, y, z, w)
glBufferData(GL_ARRAY_BUFFER, sizeof(vertexPositions), vertexPositions, GL_STATIC_DRAW);
//Enable the vbo at index 0 of the vao (assuming I have stored it previously at index 0)
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, 0);
//Finally draw the triangle
glDrawArrays(GL_TRIANGLES, 0, 3);
我的问题是,glDrawArrays() 怎么知道绑定到 GL_ARRAY_BUFFER 的内容是指关于位置的信息,而不是关于颜色的信息?