On 04/21/2017 12:25 AM, green we wrote:
I tried to use OSMesa to do offscreen rendering, refer to the osdemo and
the tutorial here: http://www.alecjacobson.com/weblog/?p=2827
There are obvious serrations on the edge of the model.
I have tried these solution but all failed, can any one gieve me some
suggestions? the solution I have tried:
1. Using post processing -- pp_jimenezmlaa
the result is not good enough.
2. Try to using MSAA by FBO, but the multisamled fbo can't be created
correctly.
Detail desctription here:
http://stackoverflow.com/questions/43532454/osmesa-gl-framebuffer-incomplete-attachment-error-when-create-a-multisampling-fb
I'm not 100% sure, but I think the Intel "swr" render works with OSMesa
and supports MSAA. That would be the only software driver that would
possibly support AA FBOs.
3. Try to modify the sampling function in mesa, according the thread:
https://sourceforge.net/p/mesa3d/mailman/message/24438334/ , set the
stop = 16 and add exit(__LINE__) in the function.
but it seems the function is not used anymore.
It's used, but only by the "legacy" swrast driver, not the llvmpipe,
softpipe or swr drivers. In any case glEnable(GL_POLYGON_SMOOTH) is not
a great approach to AA. And we don't support it with any gallium driver.
I suspect you're using either softpipe or llvmpipe. You could try swr
by setting GALLIUM_DRIVER=swr, if you build the swr driver.
-Brian
The mesa swrast AA triangle code is in src/mesa/swrast/s_aatriangle.c
and s_aatritemp.h
The compute_coverage() functions (different versions for RGB vs. CI
mode) basically count how many sub-pixel samples lie inside the
triangle for each pixel. A jittered 4x4 sample pattern is used. You
could probably increase the number of samples to improve AA quality a
little.
-Brian
Thanks!
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