> In short, SSO allow to match by name but you can't make any hypothesis on the
> previous/next stage. Therefore you must consider all inputs and output as
> actives.
New version based on Ian's feedbacks.
* Real interstage variables of the program are still optimized
* Both output and input of the program remains active
* An old bug still remains if name and explicit location rendezvous are mixed
Commits decription:
1/ add a not_interstage parameter that will be 1 when variable is either an
input of output of the program. I didn't know where to put the
ir_set_not_interstage_io
function. Maybe it can be moved in linker.cpp.
2/ Set the interstage parameter based on the shader position in the pipeline
program. Potentially can be squased with the previous one.
3/ Don't do deadcode removal of not_interstage variable with the exception
of the built-in varyings because they don't impact location of others
variables
Gregory Hainaut (4):
glsl IR: add not_interstage attribute to ir_variable
glsl link: annotate not_interstage attribute of the ir_var after link
phase
glsl IR: only allow optimization of interstage variable
allow compilation on my system
configure.ac | 6 ++++--
src/glsl/ir.h | 6 ++++++
src/glsl/ir_optimization.h | 2 ++
src/glsl/linker.cpp | 47 ++++++++++++++++++++++++++++++++++++++++++++++
src/glsl/opt_dead_code.cpp | 37 ++++++++++++++++++++++++++++++++++++
5 files changed, 96 insertions(+), 2 deletions(-)
--
2.1.4
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