Tom Stellard
71877143b6
If an instruction reads from a constant register that contains
immediates using an invalid swizzle, we can avoid generating MOV
instructions to fix up the swizzle by loading the immediates into a
different constant register that can be read using a valid swizzle.
This only affects r300 and r400 cards.
For example:
CONST[1] = { -3.5000 3.5000 2.5000 1.5000 }
MAD temp[4].xy, const[0].xy__, const[1].xz__, input[0].xy__;
========== Before this change would be lowered to: =========
CONST[1] = { -3.5000 3.5000 2.5000 1.5000 }
MOV temp[0].x, const[1].x___;
MOV temp[0].y, const[1]._z__;
MAD temp[4].xy, const[0].xy__, temp[0].xy__, input[0].xy__;
========== After this change is lowered to: ===============
CONST[1] = { -3.5000 3.5000 2.5000 1.5000 }
CONST[2] = { 0.0000 -3.5000 2.5000 0.0000 }
MAD temp[4].xy, const[0].xy__, const[2].yz__, input[0].xy__;
============================================================
This change reduces one of the Lightsmark shaders from 133 to 91
instructions.
v2:
- Fix crash caused by swizzles with only inline constants.
File: docs/README.WIN32 Last updated: 23 April 2011 Quick Start ----- ----- Windows drivers are build with SCons. Makefiles or Visual Studio projects are no longer shipped or supported. Run scons osmesa mesagdi to build classic mesa Windows GDI drivers; or 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. 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.