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de505f7d7b
dEQP-GLES31.functional.fbo.no_attachments.* draws a quad with no
framebuffer attachments, using a shader that discards based on
gl_FragCoord. It uses occlusion queries to inspect whether pixels
are rendered or not.
Unfortunately, the hardware is not dispatching any pixel shaders,
so discards never happen, and the full quad of pixels increments
PS_DEPTH_COUNT, making the occlusion query results bogus.
To understand why, we have to delve into the WM_INT internal
signalling mechanism's formulas.
The "WM_INT::Pixel Shader Kill Pixel" signal is defined as:
3DSTATE_WM::ForceKillPixel == ON ||
(3DSTATE_WM::ForceKillPixel != Off &&
!WM_INT::WM_HZ_OP &&
3DSTATE_WM::EDSC_Mode != PREPS &&
(WM_INT::Depth Write Enable || WM_INT::Stencil Write Enable) &&
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
(3DSTATE_PS_EXTRA::PixelShaderKillsPixels ||
3DSTATE_PS_EXTRA:: oMask Present to RenderTarget ||
3DSTATE_PS_BLEND::AlphaToCoverageEnable ||
3DSTATE_PS_BLEND::AlphaTestEnable ||
3DSTATE_WM_CHROMAKEY::ChromaKeyKillEnable))
Because there is no depth or stencil buffer, writes to those buffers
are disabled. So the highlighted condition is false, making the whole
"Kill Pixel" condition false. This then feeds into the following
"WM_INT::ThreadDispatchEnable" condition:
3DSTATE_WM::ForceThreadDispatch != OFF &&
!WM_INT::WM_HZ_OP &&
3DSTATE_PS_EXTRA::PixelShaderValid &&
(3DSTATE_PS_EXTRA::PixelShaderHasUAV ||
WM_INT::Pixel Shader Kill Pixel ||
WM_INT::RTIndependentRasterizationEnable ||
(!3DSTATE_PS_EXTRA::PixelShaderDoesNotWriteRT &&
3DSTATE_PS_BLEND::HasWriteableRT) ||
(WM_INT::Pixel Shader Computed Depth Mode != PSCDEPTH_OFF &&
(WM_INT::Depth Test Enable || WM_INT::Depth Write Enable)) ||
(3DSTATE_PS_EXTRA::Computed Stencil && WM_INT::Stencil Test Enable) ||
(3DSTATE_WM::EDSC_Mode == 1 && (WM_INT::Depth Test Enable ||
WM_INT::Depth Write Enable ||
WM_INT::Stencil Test Enable)))
Given that there's no depth/stencil testing, no writeable render target,
and the hardware thinks kill pixel doesn't happen, all of these
conditions are false. We have to whack some bit to make PS invocations
happen. There are many options.
Curro suggested using the UAV bit. There's some precedence in doing
that - we set it for fragment shaders that do SSBO/image/atomic writes
when no color buffer writes are enabled. We can simply include discard
here too.
Fixes 64 dEQP-GLES31.functional.fbo.no_attachments.* tests.
v2: Add a comment suggested and written by Jason Ekstrand.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
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File: docs/README.WIN32 Last updated: 21 June 2013 Quick Start ----- ----- Windows drivers are build with SCons. Makefiles or Visual Studio projects are no longer shipped or supported. Run scons libgl-gdi to build gallium based GDI driver. This will work both with MSVS or Mingw. Windows Drivers ------- ------- At this time, only the gallium GDI driver is known to work. Source code also exists in the tree for other drivers in src/mesa/drivers/windows, but the status of this code is unknown. Recipe ------ Building on windows requires several open-source packages. These are steps that work as of this writing. - install python 2.7 - install scons (latest) - install mingw, flex, and bison - install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe - install git - download mesa from git see http://www.mesa3d.org/repository.html - run scons General ------- After building, you can copy the above DLL files to a place in your PATH such as $SystemRoot/SYSTEM32. If you don't like putting things in a system directory, place them in the same directory as the executable(s). Be careful about accidentially overwriting files of the same name in the SYSTEM32 directory. The DLL files are built so that the external entry points use the stdcall calling convention. Static LIB files are not built. The LIB files that are built with are the linker import files associated with the DLL files. The si-glu sources are used to build the GLU libs. This was done mainly to get the better tessellator code. If you have a Windows-related build problem or question, please post to the mesa-dev or mesa-users list.