glDraw*返回GL_INVALID_ENUM

Question

我正在尝试在OpenGL中渲染一些对象,但即使我glDrawElements用正确的模式调用它,它仍然给了我一个GL_INVALID_ENUM.这是AMD的CodeXL记录的呼叫记录,从设置到渲染:

glBindVertexArray(1) 

... creating shaders/programs and getting uniform locations ...

# the vertex buffer
glGenBuffers(1, 0x008A945C) 
glBindBuffer(GL_ARRAY_BUFFER, 1) 
glBufferData(GL_ARRAY_BUFFER, 96, 0x008A94A0, GL_STATIC_DRAW) 

# the element index buffer
glGenBuffers(1, 0x008A9460) 
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 2) 
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 96, 0x008A9508, GL_STATIC_DRAW) 

glClearColor(0.12, 0.63999999, 0.55000001, 1) 
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) 


glEnableVertexAttribArray(0) 
glUseProgram(1)

glUniformMatrix4fv(0, 1, FALSE, ... MVP Matrix ...)
glBindBuffer(GL_ARRAY_BUFFER, 1) 
glVertexAttribPointer(0, 3, GL_FLOAT, FALSE, 0, 0x00000000) 
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 2) 


glDrawElements(GL_QUADS, 24, GL_UNSIGNED_INT, 0x00000000) # GL_INVALID_ENUM here <----


glUseProgram(0)
glDisableVertexAttribArray(0) 
wglSwapBuffers(0x09011214) 

我已经尝试换glDrawElements用glDrawArrays(GL_QUADS, 0, 4)(用正确的参数),它仍然给了我同样的错误.可能是什么导致了这个？CodeXL似乎很确定错误是在绘制调用时准确引发的,而不是之前.

Answer 1

那是因为GL_QUADS在OpenGL 3中已被弃用,请参阅文档glDrawArrays.

你可以:

1. 绘制三角形(推荐).
2. 使用兼容性配置文件创建opengl上下文.(如何做到这一点完全取决于您首先使用什么来创建上下文,SDL,glfw等)