Infrastructure: add include search paths (-I, etc.).

StandAlone/DirStackFileIncluder.h

@@ -48,6 +48,8 @@
 // Can be overridden to customize.
 class DirStackFileIncluder : public glslang::TShader::Includer {
 public:
+    DirStackFileIncluder() : externalLocalDirectoryCount(0) { }
+
     virtual IncludeResult* includeLocal(const char* headerName,
                                         const char* includerName,
                                         size_t inclusionDepth) override
@@ -62,6 +64,18 @@ public:
         return readSystemPath(headerName);
     }
 
+    // Externally set directories. E.g., from a command-line -I<dir>.
+    //  - Most-recently pushed are checked first.
+    //  - All these are checked after the parse-time stack of local directories
+    //    is checked.
+    //  - This only applies to the "local" form of #include.
+    //  - Makes its own copy of the path.
+    virtual void pushExternalLocalDirectory(const std::string& dir)
+    {
+        directoryStack.push_back(dir);
+        externalLocalDirectoryCount = directoryStack.size();
+    }
+
     virtual void releaseInclude(IncludeResult* result) override
     {
         if (result != nullptr) {
@@ -75,17 +89,19 @@ public:
 protected:
     typedef char tUserDataElement;
     std::vector<std::string> directoryStack;
+    int externalLocalDirectoryCount;
 
     // Search for a valid "local" path based on combining the stack of include
     // directories and the nominal name of the header.
     virtual IncludeResult* readLocalPath(const char* headerName, const char* includerName, int depth)
     {
-        // Discard popped include directories, and if first level, initialize.
-        directoryStack.resize(depth);
+        // Discard popped include directories, and
+        // initialize when at parse-time first level.
+        directoryStack.resize(depth + externalLocalDirectoryCount);
         if (depth == 1)
-            directoryStack.front() = getDirectory(includerName);
+            directoryStack.back() = getDirectory(includerName);
 
-        // find a directory that works, reverse search of include stack
+        // Find a directory that works, using a reverse search of the include stack.
         for (auto it = directoryStack.rbegin(); it != directoryStack.rend(); ++it) {
             std::string path = *it + '/' + headerName;
             std::replace(path.begin(), path.end(), '\\', '/');

StandAlone/StandAlone.cpp

@@ -167,6 +167,7 @@ const char* entryPointName = nullptr;
 const char* sourceEntryPointName = nullptr;
 const char* shaderStageName = nullptr;
 const char* variableName = nullptr;
+std::vector<std::string> IncludeDirectoryList;
 
 std::array<unsigned int, EShLangCount> baseSamplerBinding;
 std::array<unsigned int, EShLangCount> baseTextureBinding;
@@ -407,6 +408,13 @@ void ProcessArguments(std::vector<std::unique_ptr<glslang::TWorkItem>>& workItem
                     Options |= EOptionLinkProgram;
                 }
                 break;
+            case 'I':
+                if (argv[0][2] == 0) {
+                    printf("include path must immediately follow (no spaces) -I\n");
+                    exit(EFailUsage);
+                }
+                IncludeDirectoryList.push_back(argv[0]+2);
+                break;
             case 'V':
                 Options |= EOptionSpv;
                 Options |= EOptionVulkanRules;
@@ -668,6 +676,8 @@ void CompileAndLinkShaderUnits(std::vector<ShaderCompUnit> compUnits)
         const int defaultVersion = Options & EOptionDefaultDesktop? 110: 100;
 
         DirStackFileIncluder includer;
+        std::for_each(IncludeDirectoryList.rbegin(), IncludeDirectoryList.rend(), [&includer](const std::string& dir) {
+            includer.pushExternalLocalDirectory(dir); });
         if (Options & EOptionOutputPreprocessed) {
             std::string str;
             if (shader->preprocess(&Resources, defaultVersion, ENoProfile, false, false,
@@ -1031,6 +1041,8 @@ void usage()
            "  -G          create SPIR-V binary, under OpenGL semantics; turns on -l;\n"
            "              default file name is <stage>.spv (-o overrides this)\n"
            "  -H          print human readable form of SPIR-V; turns on -V\n"
+           "  -I<dir>     add dir to the include search path; includer's directory\n"
+           "              is searched first, followed by left-to-right order of -I\n"
            "  -E          print pre-processed GLSL; cannot be used with -l;\n"
            "              errors will appear on stderr.\n"
            "  -S <stage>  uses specified stage rather than parsing the file extension\n"

Test/baseResults/hlsl.dashI.vert.out

@@ -0,0 +1,69 @@
+hlsl.dashI.vert
+// Module Version 10000
+// Generated by (magic number): 80001
+// Id's are bound by 40
+
+                              Capability Shader
+               1:             ExtInstImport  "GLSL.std.450"
+                              MemoryModel Logical GLSL450
+                              EntryPoint Vertex 4  "main" 38
+                              Source HLSL 500
+                              Name 4  "main"
+                              Name 9  "@main("
+                              Name 11  "$Global"
+                              MemberName 11($Global) 0  "i1"
+                              MemberName 11($Global) 1  "p1"
+                              MemberName 11($Global) 2  "p2"
+                              MemberName 11($Global) 3  "p3"
+                              MemberName 11($Global) 4  "i4"
+                              Name 13  ""
+                              Name 38  "@entryPointOutput"
+                              MemberDecorate 11($Global) 0 Offset 0
+                              MemberDecorate 11($Global) 1 Offset 16
+                              MemberDecorate 11($Global) 2 Offset 32
+                              MemberDecorate 11($Global) 3 Offset 48
+                              MemberDecorate 11($Global) 4 Offset 64
+                              Decorate 11($Global) Block
+                              Decorate 13 DescriptorSet 0
+                              Decorate 38(@entryPointOutput) BuiltIn Position
+               2:             TypeVoid
+               3:             TypeFunction 2
+               6:             TypeFloat 32
+               7:             TypeVector 6(float) 4
+               8:             TypeFunction 7(fvec4)
+     11($Global):             TypeStruct 7(fvec4) 7(fvec4) 7(fvec4) 7(fvec4) 7(fvec4)
+              12:             TypePointer Uniform 11($Global)
+              13:     12(ptr) Variable Uniform
+              14:             TypeInt 32 1
+              15:     14(int) Constant 0
+              16:             TypePointer Uniform 7(fvec4)
+              19:     14(int) Constant 4
+              23:     14(int) Constant 1
+              27:     14(int) Constant 2
+              31:     14(int) Constant 3
+              37:             TypePointer Output 7(fvec4)
+38(@entryPointOutput):     37(ptr) Variable Output
+         4(main):           2 Function None 3
+               5:             Label
+              39:    7(fvec4) FunctionCall 9(@main()
+                              Store 38(@entryPointOutput) 39
+                              Return
+                              FunctionEnd
+       9(@main():    7(fvec4) Function None 8
+              10:             Label
+              17:     16(ptr) AccessChain 13 15
+              18:    7(fvec4) Load 17
+              20:     16(ptr) AccessChain 13 19
+              21:    7(fvec4) Load 20
+              22:    7(fvec4) FAdd 18 21
+              24:     16(ptr) AccessChain 13 23
+              25:    7(fvec4) Load 24
+              26:    7(fvec4) FAdd 22 25
+              28:     16(ptr) AccessChain 13 27
+              29:    7(fvec4) Load 28
+              30:    7(fvec4) FAdd 26 29
+              32:     16(ptr) AccessChain 13 31
+              33:    7(fvec4) Load 32
+              34:    7(fvec4) FAdd 30 33
+                              ReturnValue 34
+                              FunctionEnd

Test/hlsl.dashI.vert

@@ -0,0 +1,13 @@
+// For -Iinc1/path1 -Iinc1/path2
+// bar.h from local directory will define i1, while the ones from inc1/path1 and inc1/path2 will not.
+// notHere.h is only in inc1/path1 and inc2/path2, and only inc1/path1 defines p1, p2, and p3
+// parent.h is local again, and defines i4
+
+#include "bar.h"
+#include "notHere.h"
+#include "parent.h"
+
+float4 main() : SV_Position
+{
+    return i1 + i4 + p1 + p2 + p3;
+}

Test/inc1/path1/bar.h

@@ -0,0 +1 @@
+float4 i9991;

Test/inc1/path1/local.h

@@ -0,0 +1 @@
+float4 p2;

Test/inc1/path1/notHere.h

@@ -0,0 +1,4 @@
+float4 p1;
+
+#include "local.h"
+#include "remote.h"

Test/inc1/path2/bar.h

@@ -0,0 +1 @@
+float4 i9991;

Test/inc1/path2/notHere.h

@@ -0,0 +1 @@
+float4 paoeu1;

Test/inc1/path2/remote.h

@@ -0,0 +1 @@
+float4 p3;

Test/runtests

@@ -116,6 +116,8 @@ $EXE -D -e main -H hlsl.includeNegative.vert > $TARGETDIR/hlsl.includeNegative.v
 diff -b $BASEDIR/hlsl.includeNegative.vert.out $TARGETDIR/hlsl.includeNegative.vert.out || HASERROR=1
 $EXE -l -i include.vert > $TARGETDIR/include.vert.out
 diff -b $BASEDIR/include.vert.out $TARGETDIR/include.vert.out || HASERROR=1
+$EXE -D -e main -H -Iinc1/path1 -Iinc1/path2 hlsl.dashI.vert > $TARGETDIR/hlsl.dashI.vert.out
+diff -b $BASEDIR/hlsl.dashI.vert.out $TARGETDIR/hlsl.dashI.vert.out || HASERROR=1
 
 #
 # Final checking