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Fixes long standing bug on NV10 and NV20 where using a non-1x RGB or A
post-scale with GL_DOT3_RGB or GL_DOT3_RGBA texture environment would
not work.
The old combiner math uses HALF_BIAS_NORMAL and HALF_BIAS_NEGATE. The
GL_NV_register_combiners defines these as
HALF_BIAS_NORMAL_NV max(0.0, e) - 0.5
HALF_BIAS_NEGATE_NV -max(0.0, e) + 0.5
In order to get the correct result from the dot-product, the
intermediate dot-product must be multiplied by 4. This is a literal
implementation of the GL_ARB_texture_env_dot3 spec. It also requires
using the register combiner post-scale. As a result, the post-scale
cannot be used for the post-scale set by the application.
The new combiner math uses EXPAND_NORMAL and EXPAND_NEGATE. The
GL_NV_register_combiners defines these as
EXPAND_NORMAL_NV 2.0 * max(0.0, e) - 1.0
EXPAND_NEGATE_NV -2.0 * max(0.0, e) + 1.0
Since this fully expands the value to [-1, 1] range, the intermediate
dot-product result is the desired value. This leaves the register
combiner post-scale available for application use.
NOTE: I have not actually tested this.
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Acked-by: Ilia Mirkin <imirkin@alum.mit.edu>
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| Android.common.mk | ||
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| appveyor.yml | ||
| autogen.sh | ||
| CleanSpec.mk | ||
| common.py | ||
| configure.ac | ||
| install-gallium-links.mk | ||
| install-lib-links.mk | ||
| Makefile.am | ||
| REVIEWERS | ||
| SConstruct | ||
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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.