зеркало из https://github.com/stride3d/xkslang.git
138 строки
5.0 KiB
Plaintext
138 строки
5.0 KiB
Plaintext
|
|
VERSION
|
|
--------------------------------------------------------------------------------
|
|
spirv-remap 0.97
|
|
|
|
INTRO:
|
|
--------------------------------------------------------------------------------
|
|
spirv-remap is a utility to improve compression of SPIR-V binary files via
|
|
entropy reduction, plus optional stripping of debug information and
|
|
load/store optimization. It transforms SPIR-V to SPIR-V, remapping IDs. The
|
|
resulting modules have an increased ID range (IDs are not as tightly packed
|
|
around zero), but will compress better when multiple modules are compressed
|
|
together, since compressor's dictionary can find better cross module
|
|
commonality.
|
|
|
|
Remapping is accomplished via canonicalization. Thus, modules can be
|
|
compressed one at a time with no loss of quality relative to operating on
|
|
many modules at once. The command line tool operates on multiple modules
|
|
only in the trivial repetition sense, for ease of use. The remapper API
|
|
only accepts a single module at a time.
|
|
|
|
There are two modes of use: command line, and a C++11 API. Both are
|
|
described below.
|
|
|
|
spirv-remap is currently in an alpha state. Although there are no known
|
|
remapping defects, it has only been exercised on one real world game shader
|
|
workload.
|
|
|
|
|
|
FEEDBACK
|
|
--------------------------------------------------------------------------------
|
|
Report defects, enhancements requests, code improvements, etc to:
|
|
spvremapper@lunarg.com
|
|
|
|
|
|
COMMAND LINE USAGE:
|
|
--------------------------------------------------------------------------------
|
|
Examples are given with a verbosity of one (-v), but more verbosity can be
|
|
had via -vv, -vvv, etc, or an integer parameter to --verbose, such as
|
|
"--verbose 4". With no verbosity, the command is silent and returns 0 on
|
|
success, and a positive integer error on failure.
|
|
|
|
Pre-built binaries for several OSs are available. Examples presented are
|
|
for Linux. Command line arguments can be provided in any order.
|
|
|
|
1. Basic ID remapping
|
|
|
|
Perform ID remapping on all shaders in "*.spv", writing new files with
|
|
the same basenames to /tmp/out_dir.
|
|
|
|
spirv-remap -v --map all --input *.spv --output /tmp/out_dir
|
|
|
|
2. Perform all possible size reductions
|
|
|
|
spirv-remap-linux-64 -v --do-everything --input *.spv --output /tmp/out_dir
|
|
|
|
Note that --do-everything is a synonym for:
|
|
|
|
--map all --dce all --opt all --strip all
|
|
|
|
API USAGE:
|
|
--------------------------------------------------------------------------------
|
|
|
|
The public interface to the remapper is defined in SPIRV/SPVRemapper.h as follows:
|
|
|
|
namespace spv {
|
|
|
|
class spirvbin_t
|
|
{
|
|
public:
|
|
enum Options { ... };
|
|
spirvbin_t(int verbose = 0); // construct
|
|
|
|
// remap an existing binary in memory
|
|
void remap(std::vector<std::uint32_t>& spv, std::uint32_t opts = DO_EVERYTHING);
|
|
|
|
// Type for error/log handler functions
|
|
typedef std::function<void(const std::string&)> errorfn_t;
|
|
typedef std::function<void(const std::string&)> logfn_t;
|
|
|
|
// Register error/log handling functions (can be c/c++ fn, lambda fn, or functor)
|
|
static void registerErrorHandler(errorfn_t handler) { errorHandler = handler; }
|
|
static void registerLogHandler(logfn_t handler) { logHandler = handler; }
|
|
};
|
|
|
|
} // namespace spv
|
|
|
|
The class definition is in SPVRemapper.cpp.
|
|
|
|
remap() accepts an std::vector of SPIR-V words, modifies them per the
|
|
request given in 'opts', and leaves the 'spv' container with the result.
|
|
It is safe to instantiate one spirvbin_t per thread and process a different
|
|
SPIR-V in each.
|
|
|
|
The "opts" parameter to remap() accepts a bit mask of desired remapping
|
|
options. See REMAPPING AND OPTIMIZATION OPTIONS.
|
|
|
|
On error, the function supplied to registerErrorHandler() will be invoked.
|
|
This can be a standard C/C++ function, a lambda function, or a functor.
|
|
The default handler simply calls exit(5); The error handler is a static
|
|
members, so need only be set up once, not once per spirvbin_t instance.
|
|
|
|
Log messages are supplied to registerLogHandler(). By default, log
|
|
messages are eaten silently. The log handler is also a static member.
|
|
|
|
BUILD DEPENDENCIES:
|
|
--------------------------------------------------------------------------------
|
|
1. C++11 compatible compiler
|
|
2. cmake
|
|
3. glslang
|
|
|
|
|
|
BUILDING
|
|
--------------------------------------------------------------------------------
|
|
The standalone remapper is built along side glslangValidator through its
|
|
normal build process.
|
|
|
|
|
|
REMAPPING AND OPTIMIZATION OPTIONS
|
|
--------------------------------------------------------------------------------
|
|
API:
|
|
These are bits defined under spv::spirvbin_t::, and can be
|
|
bitwise or-ed together as desired.
|
|
|
|
MAP_TYPES = canonicalize type IDs
|
|
MAP_NAMES = canonicalize named data
|
|
MAP_FUNCS = canonicalize function bodies
|
|
DCE_FUNCS = remove dead functions
|
|
DCE_VARS = remove dead variables
|
|
DCE_TYPES = remove dead types
|
|
OPT_LOADSTORE = optimize unneeded load/stores
|
|
MAP_ALL = (MAP_TYPES | MAP_NAMES | MAP_FUNCS)
|
|
DCE_ALL = (DCE_FUNCS | DCE_VARS | DCE_TYPES)
|
|
OPT_ALL = (OPT_LOADSTORE)
|
|
ALL_BUT_STRIP = (MAP_ALL | DCE_ALL | OPT_ALL)
|
|
DO_EVERYTHING = (STRIP | ALL_BUT_STRIP)
|
|
|