On Mon, Dec 29, 2008 at 11:06 PM, Thomas Hansen <[email protected]>wrote:
>
> never mind figured it out. The following did the trick of saving the
> texture bound to the FBO to a file:
>
> myFBO.bind()
> buffer =(GLubyte * 3 * width* height)()
> glReadPixels(0, 0, width, height, GL_RGB,GL_UNSIGNED_BYTE, byref
> (buffer))
> image = Image.fromstring(mode="RGB", size=(width, height),
> data=buffer)
> image.save('output.png')
> myFBO.release()
>
The recommended way to create a mutable buffer is with
ctypes.create_string_buffer().
--
> Thomas
>
>
> On Dec 29, 7:48 pm, Thomas Hansen <[email protected]> wrote:
> > I'm using a framebuffer object to draw into a texture for a program I
> > am working on. I only have an ID for the texture which resides on the
> > GPU, but would like to save that texture to a file (png or jpeg).
> > However I am having some trouble figuring out how to read back the
> > image from the gpu using pyglet.
> >
> > I have tried using glReadPixles as follows, but cant get it to work:
> > glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, byref
> > (buffer))
> >
> > Does anyone know what type I have to make 'buffer' to make this work?
> > I tried buffer = c_uint(0) as well as c_ubyte(0), but that didnt seem
> > to work. Do I have to allocate the size for the data as well? if so
> > does anyone know how to declare a c array of a specific size in
> > python, or where I can read some more about the types? Amybe I am
> > totally off as well.
> >
> > I'd like to try to save the image after getting the data from
> > glReadPixles the following way using PIL, unless there is a better
> > way:
> > image = Image.fromstring(mode="RGB", size=(width, height),
> > data=buffer)
> > image.save('test.png')
> >
> > Any help is greatly apretiated!
> >
> > --
> > Thomas
> >
> > Here is the FBO class I am using...I'm trying to write a saveTexture
> > method for it:
> >
> > class Fbo:
> > def __init__(self, size=(1024,1024)):
> > self.framebuffer = c_uint(0)
> > self.depthbuffer = c_uint(0)
> > self.texture = c_uint(0)
> > self.size=size
> >
> > glGenFramebuffersEXT(1,byref(self.framebuffer))
> > glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, self.framebuffer)
> >
> > glGenRenderbuffersEXT(1, byref(self.depthbuffer));
> > glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, self.depthbuffer)
> > glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT,
> > GL_DEPTH_COMPONENT, size[0], size[1])
> > glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
> > GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, self.depthbuffer)
> >
> > glGenTextures (1, byref(self.texture))
> > glBindTexture (GL_TEXTURE_2D, self.texture)
> > glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
> > glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
> > GL_LINEAR)
> > glTexImage2D (GL_TEXTURE_2D, 0, GL_RGB, size[0], size[1],
> 0,GL_RGB,
> > GL_UNSIGNED_BYTE, 0)
> > glFramebufferTexture2DEXT (GL_FRAMEBUFFER_EXT,
> > GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, self.texture, 0)
> > glBindRenderbufferEXT (GL_RENDERBUFFER_EXT, 0)
> > glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0)
> >
> > status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
> > if status != GL_FRAMEBUFFER_COMPLETE_EXT:
> > print "Error in framebuffer activation"
> >
> > def bind(self):
> > glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, self.framebuffer)
> > glPushAttrib(GL_VIEWPORT_BIT)
> > glViewport(0,0,self.size[0], self.size[1])
> >
> > def release(self):
> > glPopAttrib()
> > glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0)
> >
>
--
Tristam MacDonald
http://swiftcoder.wordpress.com/
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