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The Vulkan rules for point size are a bit whacky. If you only have a
vertex shader and you use points, then you must write PointSize in your
vertex shader. If you have a geometry or tessellation shader, then it's
dependent on the shaderTessellationAndGeometryPointSize device feature.
From the Vulkan 1.0.38 specification:
"shaderTessellationAndGeometryPointSize indicates whether the
PointSize built-in decoration is available in the tessellation
control, tessellation evaluation, and geometry shader stages. If this
feature is not enabled, members decorated with the PointSize built-in
decoration must not be read from or written to and all points written
from a tessellation or geometry shader will have a size of 1.0. This
also indicates whether shader modules can declare the
TessellationPointSize capability for tessellation control and
evaluation shaders, or if the shader modules can declare the
GeometryPointSize capability for geometry shaders. An implementation
supporting this feature must also support one or both of the
tessellationShader or geometryShader features."
In other words, if the feature is disbled (the client can disable
features!) then they don't write PointSize and we provide a 1.0 default
but if the feature is enabled, they do write PointSize and we use the
one they wrote in the shader. There are at least two valid ways we can
implement this:
1) Track whether or not shaderTessellationAndGeometryPointSize is
enabled and set the 3DSTATE_SF bits based on that and what stages
are enabled, ignoring the shader source.
2) Just look at the last geometry stage VUE map and see if they wrote
PointSize and set the 3DSTATE_SF accordingly.
The second solution is the easiest and the most robust against invalid
usage of the Vulkan API, so we choose to go with that one.
This fixes all of the dEQP-VK.tessellation.primitive_discard.*point_mode
tests. The tests are also broken because they unconditionally enable
shaderTessellationAndGeometryPointSize if it's supported by the
implementation and then don't write PointSize in the evaluation shader.
However, since this is the "robust against invalid API usage" solution,
the tests happily pass. :-)
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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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.