[Mesa3d-dev] [Bug 27312] glCopyTexImage2D Doesnt seem to work correctly (returns incorrect alpha component )when internal format is GL_RGB

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=27312





--- Comment #8 from Chia-I Wu <ol...@gm...>  2010-03-28 01:51:22 PST ---
(In reply to comment #0)
> tmpBuf = (GLubyte *)malloc(4*sizeof(GLubyte));
> glReadPixels(12, 12, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, tmpBuf);  
> 
> /*##############################################################
> ##############################################################
> ##############################################################
> tmpBuf[0]=tmpBuf[1]=tmpBuf[2] = 143 //Expected
> tmpBuf[3] = 143 //Not expected - This should be 255 as we are not using this
> component. I have checked this with other vendors NVIDIA and ATI and they
> indeed report correct behavior (tmpBuf[3] = 255)
> ##############################################################
> ##############################################################
> ##############################################################*/
I've tested the demo with current git head, using egl_x11_swrast driver and
libGLESv2.  It has the correct behavior (tmpBuf[3] is 255).  Do you want to try
again with git head or the to-be-released 7.8?


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