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()
--
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)
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