qb: Support building with a system version of glslang.

Makefile.common

@@ -1547,8 +1547,8 @@ ifeq ($(HAVE_SHADERS_COMMON), 1)
    OBJ += gfx/video_shader_parse.o
 endif
 
-ifeq ($(HAVE_GLSLANG), 1)
-   DEFINES += -DHAVE_GLSLANG
+ifeq ($(HAVE_BUILTINGLSLANG), 1)
+   HAVE_GLSLANG_COMMON = 1
 
    ifneq ($(findstring Win32,$(OS)),)
       GLSLANG_PLATFORM := Windows
@@ -1562,8 +1562,7 @@ ifeq ($(HAVE_GLSLANG), 1)
       -I$(DEPS_DIR)/glslang/glslang \
       -I$(DEPS_DIR)/glslang/glslang/glslang/MachineIndependent \
       -I$(DEPS_DIR)/glslang/glslang/glslang/Public \
-      -I$(DEPS_DIR)/glslang/glslang/SPIRV \
-      -I$(DEPS_DIR)/glslang
+      -I$(DEPS_DIR)/glslang/glslang/SPIRV
 
    GLSLANG_SOURCES := \
       $(wildcard $(DEPS_DIR)/glslang/*.cpp) \
@@ -1578,7 +1577,23 @@ ifeq ($(HAVE_GLSLANG), 1)
       DEFINES += -DENABLE_HLSL
       GLSLANG_SOURCES += $(wildcard $(DEPS_DIR)/glslang/glslang/hlsl/*.cpp)
    endif
+else ifeq ($(HAVE_GLSLANG),1)
+   HAVE_GLSLANG_COMMON = 1
+   GLSLANG_SOURCES := $(DEPS_DIR)/glslang/glslang.cpp
 
+   # The order of these libs are somewhat specific
+   LIBS += $(GLSLANG_LIBS) \
+           $(GLSLANG_OSDEPENDENT_LIBS) \
+           $(GLSLANG_OGLCOMPILER_LIBS) \
+           $(GLSLANG_HLSL_LIBS) \
+           $(GLSLANG_SPIRV_LIBS) \
+           $(GLSLANG_SPIRV_TOOLS_OPT_LIBS) \
+           $(GLSLANG_SPIRV_TOOLS_LIBS)
+endif
+
+ifeq ($(HAVE_GLSLANG_COMMON), 1)
+   DEFINES += -DHAVE_GLSLANG
+   INCLUDE_DIRS += -I$(DEPS_DIR)/glslang
    OBJ += $(GLSLANG_SOURCES:.cpp=.o)
 endif
 

deps/glslang/glslang.cpp

@@ -15,8 +15,13 @@
 
 #include "glslang.hpp"
 
+#ifdef HAVE_BUILTINGLSLANG
 #include "glslang/glslang/Public/ShaderLang.h"
 #include "glslang/SPIRV/GlslangToSpv.h"
+#elif HAVE_GLSLANG
+#include <glslang/Public/ShaderLang.h>
+#include <glslang/SPIRV/GlslangToSpv.h>
+#endif
 #include <vector>
 #include <iostream>
 #include <cstring>

qb/config.libs.sh

@@ -564,6 +564,39 @@ check_enabled CXX SLANG slang 'The C++ compiler is' false
 check_enabled CXX GLSLANG glslang 'The C++ compiler is' false
 check_enabled CXX SPIRV_CROSS SPIRV-Cross 'The C++ compiler is' false
 
+check_enabled GLSLANG BUILTINGLSLANG 'builtin glslang' 'glslang is' true
+
+if [ "$HAVE_GLSLANG" != no ]; then
+   check_header cxx GLSLANG \
+      glslang/Public/ShaderLang.h \
+      glslang/SPIRV/GlslangToSpv.h
+
+   check_lib cxx GLSLANG -lglslang
+   check_lib cxx GLSLANG_OSDEPENDENT -lOSDependent
+   check_lib cxx GLSLANG_OGLCOMPILER -lOGLCompiler
+   check_lib cxx GLSLANG_HLSL -lHLSL
+   check_lib cxx GLSLANG_SPIRV -lSPIRV
+   check_lib cxx GLSLANG_SPIRV_TOOLS_OPT -lSPIRV-Tools-opt
+   check_lib cxx GLSLANG_SPIRV_TOOLS -lSPIRV-Tools
+
+   if [ "$HAVE_GLSLANG" = no ] ||
+      [ "$HAVE_GLSLANG_OSDEPENDENT" = no ] ||
+      [ "$HAVE_GLSLANG_OGLCOMPILER" = no ] ||
+      [ "$HAVE_GLSLANG_HLSL" = no ] ||
+      [ "$HAVE_GLSLANG_SPIRV" = no ] ||
+      [ "$HAVE_GLSLANG_SPIRV_TOOLS_OPT" = no ] ||
+      [ "$HAVE_GLSLANG_SPIRV_TOOLS" = no ]; then
+      if [ "$HAVE_BUILTINGLSLANG" != yes ]; then
+         die : 'Notice: System glslang libraries not found, disabling glslang support.'
+         HAVE_GLSLANG=no
+      else
+         HAVE_GLSLANG=yes
+      fi
+   else
+      HAVE_GLSLANG=yes
+   fi
+fi
+
 check_enabled SLANG GLSLANG glslang 'slang is' false
 check_enabled SLANG SPIRV_CROSS SPIRV-Cross 'slang is' false
 check_enabled SLANG OPENGL_CORE 'OpenGL core' 'slang is' false

qb/config.params.sh

@@ -161,6 +161,8 @@ HAVE_SLANG=auto            # slang support
 C89_SLANG=no
 HAVE_GLSLANG=auto          # glslang support (requires C++11)
 C89_GLSLANG=no
+HAVE_BUILTINGLSLANG=auto   # Bake in glslang support
+C89_BUILTINGLSLANG=no
 HAVE_SPIRV_CROSS=auto      # SPIRV-Cross support (requires C++11)
 C89_SPIRV_CROSS=no
 HAVE_METAL=no              # Metal support (macOS-only)