Re: [Mesa3d-users] Is Off-screen rendering possible with EGL and OpenVG?

[Nicholas L. <Nic...@gm...>]

Chia-I Wu-2 wrote:
> 
>> The only thing I can think to maybe try is draw my VGPath to presumably
>> the
>> surface, then call either vgReadPixels to add it to memory and then
>> create a
>> ppm file.  Does that make sense?
> You can create a pbuffer (eglCreatePbufferSurface) and make it current.
> You then start drawing as usual, and read the result using vgReadPixels.
> The only difference is that the pbuffer surface will not be shown on the
> screen.  Note that not all drivers support pbuffer.  It is
> egl_softpipe.so that I am using.
> 

I am using softpipe.  

If I go from pbuffer surface to VGImage with the following:

eglMakeCurrent(eglDisplay, pbuffer, pbuffer, eglContext);
drawTriangle();
VGImage triangle = vgCreateImage(...);
vgGetPixels(triangle, 0, 0, 0, 0, imgW, imgH);
eglMakeCurrent(eglDisplay, windowSurface, windowSurface, eglContext);
vgDrawImage(triangle);
eglSwapBuffers(eglDispla, windowSurface);

I will get my blue triangle displayed to the window but "IN[0]: Register
never used" is printed out.  This message is printed during the vgDrawImage
call.  What is it talking about?  

I also went from pbuffer to memory to VGImage:

void *picture = malloc(...);
vgReadPixels(picture, ...);
vgImageSubData(triangle, picture, ...);

and I get the same results (a displayed triangle with the message).

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