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Use GLSLANG_ANGLE to strip features to what ANGLE requires

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This change strips a few features similar to GLSLANG_WEB but doesn't
remove every detail like the latter.  It also hardcodes profile/version
to core/450.

In particular, TBuiltIns::initialize is specialized to remove most of
what is not supported or won't be supported by ANGLE.  The result of
this function is parsed with TParseContext::parseShaderStrings which is
a performance bottleneck.

This change shaves about 300KB off of ANGLE's binary size and reduces
the cost of SetupBuiltinSymbolTable to nearly a sixth.

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
This commit is contained in:
Shahbaz Youssefi 2020-07-03 15:42:53 -04:00
parent 7ab4564696
commit 1ef2e250fc
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GPG key ID: C6149357EC6727E0
17 changed files with 214 additions and 102 deletions
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7
BUILD.gn
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@ -109,7 +109,6 @@ template("glslang_sources_common") {
"SPIRV/SpvBuilder.cpp",
"SPIRV/SpvBuilder.h",
"SPIRV/SpvPostProcess.cpp",
"SPIRV/SpvTools.cpp",
"SPIRV/SpvTools.h",
"SPIRV/bitutils.h",
"SPIRV/disassemble.cpp",
@ -208,8 +207,12 @@ template("glslang_sources_common") {
defines = []
if (invoker.enable_opt) {
sources += [ "SPIRV/SpvTools.cpp" ]
defines += [ "ENABLE_OPT=1" ]
}
if (invoker.is_angle) {
defines += [ "GLSLANG_ANGLE" ]
}
if (is_win) {
sources += [ "glslang/OSDependent/Windows/ossource.cpp" ]
@ -257,11 +260,13 @@ template("glslang_sources_common") {
glslang_sources_common("glslang_lib_sources") {
enable_opt = !glslang_angle
enable_hlsl = !glslang_angle
is_angle = glslang_angle
}
glslang_sources_common("glslang_sources") {
enable_opt = true
enable_hlsl = true
is_angle = false
}
source_set("glslang_default_resource_limits_sources") {