在 PyOpenGL/PyQt 中创建大型 (2^13) 帧缓冲区对象时出现内存不足错误:
width = 8192
height = 8192
self.textureFbo = QtOpenGL.QGLFramebufferObject(width,height)
self.textureFbo.bind()
texture = self.bindTexture(QtGui.QPixmap(self.textureFilePath)) # 2^13
glClearColor (0.0, 0.0, 0.0, 0.0);
glClear (GL_COLOR_BUFFER_BIT);
glLoadIdentity()
glViewport(0, 0, width, height)
glMatrixMode(GL_PROJECTION);
glLoadIdentity()
glOrtho(0, +1, +1, 0, -0.1, 2.0);
glBegin(GL_POLYGON);
glTexCoord2d(1.0, 0.0)
glVertex3f (0.0, 0.0, 0.0)
glTexCoord2d(1.0, 1.0)
glVertex3f (1.0, 0.0, 0.0)
glTexCoord2d(0.0, 1.0)
glVertex3f (1.0, 1.0, 0.0)
glTexCoord2d(0.0, 0.0)
glVertex3f (0.0, 1.0, 0.0)
glEnd();
self.deleteTexture(texture)
self.textureFbo.release()
self.textureFboLoaded = True
给出:
OpenGL.error.GLError: GLError(
err = 1285,
description = 'out of memory',
baseOperation = glClear,
cArguments = (GL_COLOR_BUFFER_BIT,)
)
QGLFramebufferObject: Framebuffer incomplete attachment.
Traceback (most recent call last):
File "main.py", line 286, in paintGL
self.loadTextureFBO()
File "main.py", line 357, in loadTextureFBO
glEnable(GL_TEXTURE_2D)
File "C:\Python27\lib\site-packages\OpenGL\error.py", line 208, in glCheckErro
r
baseOperation = baseOperation,
OpenGL.error.GLError: GLError(
err = 1285,
description = 'out of memory',
baseOperation = glEnable,
cArguments = (GL_TEXTURE_2D,)
)
QImage: out of memory, returning null image
但是,如果我降级到 2^12 纹理或 FBO,这会很好。
在我看来,两个大约132mb 268mb(4 字节*8192^2)的图像(FBO+纹理)应该填满我的 1gb 视频内存,这似乎是不合理的。我错过了什么?