From 2da6a4aec9a249417a9e4c0106ab6bec0489a36f Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Sat, 15 Jun 2019 13:19:46 +0800
Subject: Added DevIL as an option for image loader.

---
 examples/makefile              |  2 +-
 smelt/glfw/gfx_glfw.cpp        | 26 ++++++++++++++++++++++++++
 smelt/glfw/gfx_glfw_compat.cpp | 24 ++++++++++++++++++++++--
 3 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/examples/makefile b/examples/makefile
index c927ae7..48b4891 100644
--- a/examples/makefile
+++ b/examples/makefile
@@ -1,7 +1,7 @@
 CC= g++
 CXXFLAGS= -I/usr/include/freetype2 -I../include -D_LINUX -g
 LINK= -lSDL2 -lvorbis -lvorbisfile -lopenal -ljpeg -lpng -lfreetype -lz -lsmeltext -lsmelt -lCxImage
-LINK_GLFW= -lglfw -lGLEW -lGL -lvorbis -lvorbisfile -lopenal -ljpeg -lpng -lfreetype -lz -lsmeltext -lsmelt -lCxImage
+LINK_GLFW= -lglfw -lGLEW -lGL -lvorbis -lvorbisfile -lopenal -ljpeg -lpng -lfreetype -lz -lsmeltext -lsmelt -lIL -lILU
 LINK_FOLDER= -L../smelt/sdl -L../extensions
 LINK_GLFW_FOLDER= -L../smelt/glfw -L../extensions
 
diff --git a/smelt/glfw/gfx_glfw.cpp b/smelt/glfw/gfx_glfw.cpp
index c545073..aa5f4bd 100644
--- a/smelt/glfw/gfx_glfw.cpp
+++ b/smelt/glfw/gfx_glfw.cpp
@@ -9,7 +9,13 @@
  *
  */
 #include "smelt_internal.hpp"
+
+#ifdef USE_CXIMAGE
 #include "CxImage/ximage.h"
+#else
+#include "IL/il.h"
+#endif
+
 #define dbg printf("%d: 0x%X\n",__LINE__,glGetError())
 #ifndef USE_OPENGL_COMPATIBILITY_PROFILE
 #include "smmath_priv.hpp"
@@ -575,6 +581,8 @@ DWORD* SMELT_IMPL::decodeImage(BYTE *data,const char *fn,DWORD size,int &w,int &
 		}
 		return px;
 	}
+
+#ifdef USE_CXIMAGE
 	CxImage img;
 	img.Decode(data,size,CXIMAGE_FORMAT_UNKNOWN);
 	if(img.IsValid())
@@ -593,6 +601,24 @@ DWORD* SMELT_IMPL::decodeImage(BYTE *data,const char *fn,DWORD size,int &w,int &
 			*(sptr++)=achannel?rgb.rgbReserved:0xFF;
 		}
 	}
+#else
+	ilInit();
+	ILuint iid;
+	ilGenImages(1,&iid);
+	if(ilLoadL(IL_TYPE_UNKNOWN,data,size))
+	{
+		w=ilGetInteger(IL_IMAGE_WIDTH);
+		h=ilGetInteger(IL_IMAGE_HEIGHT);
+		if(ilGetInteger(IL_IMAGE_FORMAT)!=IL_UNSIGNED_INT||ilGetInteger(IL_IMAGE_TYPE)!=IL_RGBA)
+		ilConvertImage(IL_UNSIGNED_INT,IL_RGBA);
+		px=new DWORD[w*h];
+		for(int i=0;i<h;++i)
+		memcpy(px+w*(h-1-i),ilGetData()+w*i*sizeof(DWORD)/sizeof(ILubyte),w*sizeof(DWORD));
+	}
+	ilDeleteImages(1,&iid);
+	ilShutDown();
+#endif
+
 	return px;
 }
 void SMELT_IMPL::bindTexture(glTexture *t)
diff --git a/smelt/glfw/gfx_glfw_compat.cpp b/smelt/glfw/gfx_glfw_compat.cpp
index 995f697..16ee500 100644
--- a/smelt/glfw/gfx_glfw_compat.cpp
+++ b/smelt/glfw/gfx_glfw_compat.cpp
@@ -582,6 +582,8 @@ DWORD* SMELT_IMPL::decodeImage(BYTE *data,const char *fn,DWORD size,int &w,int &
 		}
 		return px;
 	}
+
+#ifdef USE_CXIMAGE
 	CxImage img;
 	img.Decode(data,size,CXIMAGE_FORMAT_UNKNOWN);
 	if(img.IsValid())
@@ -589,7 +591,7 @@ DWORD* SMELT_IMPL::decodeImage(BYTE *data,const char *fn,DWORD size,int &w,int &
 		w=img.GetWidth();h=img.GetHeight();
 		px=new DWORD[w*h];
 		BYTE *sptr=(BYTE*)px;
-		bool atunnel=img.AlphaIsValid();
+		bool achannel=img.AlphaIsValid();
 		for(int i=0;i<h;++i)
 		for(int j=0;j<w;++j)
 		{
@@ -597,9 +599,27 @@ DWORD* SMELT_IMPL::decodeImage(BYTE *data,const char *fn,DWORD size,int &w,int &
 			*(sptr++)=rgb.rgbRed;
 			*(sptr++)=rgb.rgbGreen;
 			*(sptr++)=rgb.rgbBlue;
-			*(sptr++)=atunnel?rgb.rgbReserved:0xFF;
+			*(sptr++)=achannel?rgb.rgbReserved:0xFF;
 		}
 	}
+#else
+	ilInit();
+	ILuint iid;
+	ilGenImages(1,&iid);
+	if(ilLoadL(IL_TYPE_UNKNOWN,data,size))
+	{
+		w=ilGetInteger(IL_IMAGE_WIDTH);
+		h=ilGetInteger(IL_IMAGE_HEIGHT);
+		if(ilGetInteger(IL_IMAGE_FORMAT)!=IL_UNSIGNED_INT||ilGetInteger(IL_IMAGE_TYPE)!=IL_RGBA)
+		ilConvertImage(IL_UNSIGNED_INT,IL_RGBA);
+		px=new DWORD[w*h];
+		for(int i=0;i<h;++i)
+		memcpy(px+w*(h-1-i),ilGetData()+w*i*sizeof(DWORD)/sizeof(ILubyte),w*sizeof(DWORD));
+	}
+	ilDeleteImages(1,&iid);
+	ilShutDown();
+#endif
+
 	return px;
 }
 void SMELT_IMPL::bindTexture(glTexture *t)
-- 
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