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LLVMPIPE -- a fork of softpipe that employs LLVM for code generation.
Requirements
============
- Linux
- LLVM. On Debian based distributions do:
aptitude install llvm-dev
There is a type in one of the llvm-dev 2.5 headers, that causes compilation
errors in the debug build:
--- /usr/include/llvm-c/Core.h.orig 2009-08-10 15:38:54.000000000 +0100
+++ /usr/include/llvm-c/Core.h 2009-08-10 15:38:25.000000000 +0100
@@ -831,7 +831,7 @@
template<typename T>
inline T **unwrap(LLVMValueRef *Vals, unsigned Length) {
#if DEBUG
- for (LLVMValueRef *I = Vals, E = Vals + Length; I != E; ++I)
+ for (LLVMValueRef *I = Vals, *E = Vals + Length; I != E; ++I)
cast<T>(*I);
#endif
return reinterpret_cast<T**>(Vals);
- A x86 or amd64 processor with support for sse2, sse3, and sse4.1 SIMD
instructions. This is necessary because we emit several SSE intrinsics for
convenience. See /proc/cpuinfo to know what your CPU supports.
- scons (although it should be straightforward to fix the Makefiles as well)
Building
========
To build everything invoke scons as:
scons debug=yes statetrackers=mesa drivers=llvmpipe winsys=xlib dri=false -k
Using
=====
Building will create a drop-in alternative for libGL.so. To use it set the
environment variables:
export LD_LIBRARY_PATH=$PWD/build/linux-x86-debug/lib:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH=$PWD/build/linux-x86_64-debug/lib:$LD_LIBRARY_PATH
Unit testing
============
Building will also create several unit tests in
build/linux-???-debug/gallium/drivers/llvmpipe:
- lp_test_blend: blending
- lp_test_conv: SIMD vector conversion
- lp_test_format: pixel unpacking/packing
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