51 lines
2.4 KiB
Plaintext
51 lines
2.4 KiB
Plaintext
Glide3 (for Linux) was originally written for x86 only but work has been done
|
|
and is ongoing to make it work on other platforms too:
|
|
|
|
Glide3 was not only written for Linux-x86 but also for dos,windows and mac.
|
|
The triangle setup code of the dos/windows/linux-x86 code is written in
|
|
x86-assembler. Luckily there are C-equivalents for those functions written
|
|
for the mac. These C-equivalents are enabled by defining GLIDE_USE_C_TRISETUP.
|
|
|
|
The x86-asm triangle setup code comes in multiple variants for different
|
|
x86-CPU's. Glide3 chooses runtime between these variants depending on the
|
|
CPU it is actually running on. The cpu detection (cpuid) code nescesarry for
|
|
this is also written in assembler. Recently this code has been wrapped with
|
|
#ifdef GL_X86.
|
|
|
|
The defining of GL_X86 or GLIDE_USE_C_TRISETUP is controleled by passing
|
|
USE_X86=1 to the makefile. Glide3 has been successfully tested on x86 without
|
|
USE_X86=1 passed to the makefile for the cvg h3 and h5 asics. IOW this has not
|
|
been tested for the sst1 and sst96 asics.
|
|
|
|
Even if compiled without GL_X86 defined and with GLIDE_USE_C_TRISETUP
|
|
defined the Glide3 code still contains a small piece of assembler: The
|
|
P6FENCE macro, this macro is used for io synchronisation and needs to be
|
|
defined for each platform you want to compile Glide3 on. You can find it in,
|
|
and to add a new platfrom need to add a define to:
|
|
cvg/init/sst1init.h
|
|
cvg/glide3/src/fxglide.h
|
|
h3/minihwc/minihwc.c
|
|
h3/minihwc/linhwc.c
|
|
h3/glide3/src/fxglide.h
|
|
h5/minihwc/minihwc.c
|
|
h5/minihwc/linhwc.c
|
|
h5/glide3/src/fxglide.h
|
|
sst1/init/initvg/sst1init.h
|
|
Currently for Linux there is a version of the P6FENCE macro for the following
|
|
platforms: x86, x86_64, ia64, alpha .
|
|
|
|
The original Glide3 code is not 64 bit clean, longs where used for 32 bits
|
|
registers, ptrs casted to and stored as ints, etc. RedHat has created and
|
|
tested a 64bit clean version of Glide3 for h5 and h3. This work has been
|
|
merged into current CVS, however this was based in an older Glide3 version,
|
|
so h5 and h3 might not be completely 64 bit clean. The other asics are far
|
|
from 64 bit clean. The Debian Glide3 package also contain some 64 bit
|
|
patches, these are probably equivalent to the RedHat ones, but might be
|
|
worth a look.
|
|
|
|
Last but not least some C-functions take the address of their first parameter
|
|
and assume this can be used as an array, iow they assume a certain stack
|
|
layout. Known functions doing this are:
|
|
cvg/glide3/src/gdraw.c:1142: _vptrisetup_cull
|
|
h5/glide3/src/gdraw.c:279: grDrawLine
|