Re: [PyOpenGL-Users] glReadPixels

[Ian M. <geo...@gm...>]

On Sun, Aug 16, 2009 at 4:13 PM, Mike C. Fletcher <mcf...@vr...>wrote:
Well, the issue was me not knowing what I was doing :-)
It's working perfectly now, thanks!

>        """Test that glDrawBuffers with list argument where value is set"""
>        previous = glGetIntegerv( GL_READ_BUFFER )

Ah...not glGetString

>        fbo = glGenFramebuffersEXT(1)
>        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo)
>        try:
>            img1,img2 = glGenTextures(2)
>            for img in img1,img2:
>                glBindTexture( GL_TEXTURE_2D, img )
>                glTexImage2D(
>                    GL_TEXTURE_2D, 0, GL_RGB8,
>                    300, 300, 0, GL_RGB,
>                    GL_INT,
>                    None # no data transferred
>                )
>
>
>            glFramebufferTexture2DEXT(
>                GL_FRAMEBUFFER_EXT,
>                GL_COLOR_ATTACHMENT0_EXT,
>                GL_TEXTURE_2D, img1, 0
>            )
>            glFramebufferTexture2DEXT(
>                GL_FRAMEBUFFER_EXT,
>                GL_COLOR_ATTACHMENT1_EXT,
>                GL_TEXTURE_2D, img2, 0
>            )
>            a_type = constants.GLenum*2
>            drawingBuffers = a_type(
>                GL_COLOR_ATTACHMENT0_EXT,
>                GL_COLOR_ATTACHMENT1_EXT,
>            )
>            glDrawBuffers(2, drawingBuffers )
>            glReadBuffer( GL_COLOR_ATTACHMENT1_EXT )
>            pixels = glReadPixels( 0,0, 10,10, GL_RGB, GL_UNSIGNED_BYTE )
>            assert len(pixels) == 300, len(pixels)
>        finally:
>            glBindFramebufferEXT( GL_FRAMEBUFFER_EXT, 0 )

Ah...not GL_AUX*i*

>        glReadBuffer( previous )

Ah...not glReadBuffer(GL_BACK)

> Can you give me a script that shows the failure?
>
> Good luck,
> Mike

Ian