我目前正在连接一个 OpenGL 应用程序并且正在获取GL_INVALID_OPERATION. 整个 GL 分散在几个文件中，很难从中创建一个示例，但我使用apitrace. 这是造成错误的一大块：
glMatrixMode(mode = GL_PROJECTION)
glLoadIdentity()
glViewport(x = 0, y = 0, width = 1190, height = 746)
glOrtho(left = 0, right = 1190, bottom = 0, top = 746, zNear = 0, zFar = 128)
glBegin(mode = GL_QUADS)
glColor4f(red = 0.5, green = 0.5, blue = 0.5, alpha = 1)
glVertex3f(x = 1190, y = 746, z = 0)
glColor4f(red = 0.5, green = 0.5, blue = 0.5, alpha = 1)
glVertex3f(x = 0, y = 746, z = 0)
glColor4f(red = 0.5, green = 0.5, blue = 0.5, alpha = 1)
glVertex3f(x = 0, y = 100, z = 0)
glColor4f(red = 0.5, green = 0.5, blue = 0.5, alpha = 1)
glVertex3f(x = 1190, y = 100, z = 0)
glEnd()
glGetError() = GL_INVALID_OPERATION
有人对此有任何想法吗？