From 8dd523fa67f03add766aaf094409d468b20d9542 Mon Sep 17 00:00:00 2001
From: bkaradzic <branimirkaradzic@gmail.com>
Date: Tue, 26 Jun 2012 20:55:33 -0700
Subject: [PATCH] Added support for outputing makefile style dependencies when
 compiling shaders.

---
 3rdparty/fcpp/cpp1.c   |  1 +
 3rdparty/fcpp/cpp3.c   |  7 ++++++
 3rdparty/fcpp/cppadd.h |  2 ++
 3rdparty/fcpp/fpp.h    |  3 +++
 tools/shaderc.cpp      | 52 ++++++++++++++++++++++++++++++++++++------
 5 files changed, 58 insertions(+), 7 deletions(-)

diff --git a/3rdparty/fcpp/cpp1.c b/3rdparty/fcpp/cpp1.c
index 4456ea2f..5c8fd813 100644
--- a/3rdparty/fcpp/cpp1.c
+++ b/3rdparty/fcpp/cpp1.c
@@ -99,6 +99,7 @@ int fppPreProcess(struct fppTag *tags)
   global->macro=NULL;
   global->evalue=0;
 
+  global->depends=NULL;
   global->input=NULL;
   global->output=NULL;
   global->error=NULL;
diff --git a/3rdparty/fcpp/cpp3.c b/3rdparty/fcpp/cpp3.c
index 2f77fbc5..7d3cfcf0 100644
--- a/3rdparty/fcpp/cpp3.c
+++ b/3rdparty/fcpp/cpp3.c
@@ -40,6 +40,10 @@ ReturnCode openfile(struct Global *global, char *filename)
   else
     ret=addfile(global, fp, filename);
 
+  if(!ret && global->depends) {
+	global->depends(filename, global->userdata);
+  }
+
   if(!ret && global->showincluded) {
           /* no error occured! */
           Error(global, "cpp: included \"");
@@ -237,6 +241,9 @@ int dooptions(struct Global *global, struct fppTag *tags)
       strcpy(global->work, tags->data);    /* Remember input filename */
       global->first_file=tags->data;
       break;
+	case FPPTAG_DEPENDS:
+      global->depends=(void (*)(char *, void *))tags->data;
+	  break;
     case FPPTAG_INPUT:
       global->input=(char *(*)(char *, int, void *))tags->data;
       break;
diff --git a/3rdparty/fcpp/cppadd.h b/3rdparty/fcpp/cppadd.h
index a088af3d..b65db92e 100644
--- a/3rdparty/fcpp/cppadd.h
+++ b/3rdparty/fcpp/cppadd.h
@@ -199,6 +199,8 @@ struct Global {
 
   int evalue;                   /* Current value from evallex() */
 
+  void (*depends)(char *filename, void *); /* depends function */
+
   char *(*input)(char *, int, void *);  /* Input function */
 
   char *first_file;             /* Preprocessed file. */
diff --git a/3rdparty/fcpp/fpp.h b/3rdparty/fcpp/fpp.h
index bf774dca..fe25ac52 100644
--- a/3rdparty/fcpp/fpp.h
+++ b/3rdparty/fcpp/fpp.h
@@ -156,4 +156,7 @@ struct fppTag {
 /* Switch on WWW-mode */
 #define FPPTAG_WEBMODE 33
 
+/* Depends function: */
+#define FPPTAG_DEPENDS 34 /* data is an depends funtion */
+
 int fppPreProcess(struct fppTag *);
diff --git a/tools/shaderc.cpp b/tools/shaderc.cpp
index edc67496..d4d8122b 100644
--- a/tools/shaderc.cpp
+++ b/tools/shaderc.cpp
@@ -268,7 +268,7 @@ void printCode(const char* _code)
 
 bool compileGLSLShader(CommandLine& _cmdLine, const std::string& _code, const char* _outFilePath)
 {
-	const glslopt_shader_type type = (0 == _stricmp(_cmdLine.findOption('\0', "type"), "fragment") ) ? kGlslOptShaderFragment : kGlslOptShaderVertex;
+	const glslopt_shader_type type = tolower(_cmdLine.findOption('\0', "type")[0]) == 'f' ? kGlslOptShaderFragment : kGlslOptShaderVertex;
 
 	glslopt_ctx* ctx = glslopt_initialize(false);
 
@@ -500,6 +500,10 @@ struct Preprocessor
 		m_tagptr->data = this;
 		m_tagptr++;
 
+		m_tagptr->tag = FPPTAG_DEPENDS;
+		m_tagptr->data = (void*)fppDepends;
+		m_tagptr++; 
+
 		m_tagptr->tag = FPPTAG_INPUT;
 		m_tagptr->data = (void*)fppInput;
 		m_tagptr++; 
@@ -550,11 +554,22 @@ struct Preprocessor
 		m_default += temp;
 	}
 
+	void addDependency(const char* _fileName)
+	{
+		m_depends += " \\\n ";
+		m_depends += _fileName;
+	}
+
 	bool run()
 	{
 		m_fgetsPos = 0;
 
 		FILE* file = fopen(m_filePath, "r");
+		if (NULL == file)
+		{
+			return false;
+		}
+
 		long int size = fsize(file);
 		char* input = new char[size+1];
 		size = fread(input, 1, size, file);
@@ -593,6 +608,12 @@ struct Preprocessor
 		return NULL;
 	}
 
+	static void fppDepends(char* _fileName, void* _userData)
+	{
+		Preprocessor* thisClass = (Preprocessor*)_userData;
+		thisClass->addDependency(_fileName);
+	}
+
 	static char* fppInput(char* _buffer, int _size, void* _userData)
 	{
 		Preprocessor* thisClass = (Preprocessor*)_userData;
@@ -623,6 +644,7 @@ struct Preprocessor
 	fppTag* m_tagptr;
 
 	char* m_filePath;
+	std::string m_depends;
 	std::string m_default;
 	std::string m_input;
 	std::string m_preprocessed;
@@ -673,6 +695,7 @@ int main(int _argc, const char* _argv[])
 		return EXIT_FAILURE;
 	}
 
+	bool depends = cmdLine.hasArg("depends");
 	bool preprocessOnly = cmdLine.hasArg("preprocess");
 
 	Preprocessor preprocessor(filePath);
@@ -788,19 +811,34 @@ int main(int _argc, const char* _argv[])
 			return EXIT_SUCCESS;
 		}
 
+		bool compiled = false;
+
 		if (glsl)
 		{
-			if (compileGLSLShader(cmdLine, preprocessor.m_preprocessed, outFilePath) )
-			{
-				return EXIT_SUCCESS;
-			}
+			compiled = compileGLSLShader(cmdLine, preprocessor.m_preprocessed, outFilePath);
 		}
 		else
 		{
-			if (compileHLSLShader(cmdLine, preprocessor.m_preprocessed, outFilePath) )
+			compiled = compileHLSLShader(cmdLine, preprocessor.m_preprocessed, outFilePath);
+		}
+
+		if (compiled
+		&&  depends)
+		{
+			std::string ofp = outFilePath;
+			ofp += ".d";
+			FILE* out = fopen(ofp.c_str(), "wb");
+			if (NULL != out)
 			{
-				return EXIT_SUCCESS;
+				Stream stream(out);
+				stream.write(outFilePath);
+				stream.write(":");
+				stream.write(preprocessor.m_depends.c_str() );
+				stream.write("\n");
+				stream.close();
+				fclose(out);
 			}
+			return EXIT_SUCCESS;
 		}
 	}