diff --git a/include/ZE_Defines.h b/include/ZE_Defines.h
index c795132..293f9a8 100644
--- a/include/ZE_Defines.h
+++ b/include/ZE_Defines.h
@@ -22,6 +22,20 @@
 
 //Defines- undefine any of these if you dont have the indicated SDL extension//
 
+/*!
+    \brief Defines for graphics backend selection.
+
+    Various graphics backends, default is OpenGL, but to port to systems with SDL but no OpenGL
+    use of SDL is possible. .
+**/
+enum GFXBackend 
+{ 
+    OGL, /*!< OpenGL 2D Rendering Target.  */
+    SDL  /*!< SDL Rendering Target.  */
+};
+
+//! Define the graphics backend for ZEngine to use. (Options are OGL,SDL,DX)
+#define GFX_BACKEND OGL
 //! Define to include font support.
 #define USE_SDL_TTF
 //! Define to include non-bmp image file support.
diff --git a/include/ZE_Includes.h b/include/ZE_Includes.h
index 34ee62b..542b1c0 100644
--- a/include/ZE_Includes.h
+++ b/include/ZE_Includes.h
@@ -24,8 +24,10 @@
 #include "ZE_Defines.h"
 
 #include "SDL.h"
+#if GFX_BACKEND == OGL
 #include "SDL_opengl.h"
 #include "external/SDLGL_Util.h"
+#endif
 #ifdef USE_SDL_IMAGE
 #include "SDL_image.h"
 #endif
diff --git a/include/ZE_ZEngine.h b/include/ZE_ZEngine.h
index 2e1a3f4..5707684 100644
--- a/include/ZE_ZEngine.h
+++ b/include/ZE_ZEngine.h
@@ -13,7 +13,7 @@
     \brief Definition file for core ZEngine class.
 
     ZEngine Game Engine core Engine definition.
-    <br>$Id: ZE_ZEngine.h,v 1.44 2003/07/12 01:25:42 cozman Exp $<br>
+    <br>$Id: ZE_ZEngine.h,v 1.45 2003/08/01 21:57:32 cozman Exp $<br>
     \author James Turk
 **/
 
@@ -233,13 +233,14 @@ class ZEngine
             \brief Clear screen to a certain color (Black by default).
 
             Clears a rectangle on screen to a color, defaults to solid black.
-            \param red Red component (0.0-1.0) of new color.
-            \param green Green component (0.0-1.0) of new color.
-            \param blue Blue component (0.0-1.0) of new color.
-            \param alpha Alpha component (0.0-1.0) of new color.
+            \param red Red component (0-255) of new color.
+            \param green Green component (0-255) of new color.
+            \param blue Blue component (0-255) of new color.
+            \param alpha Alpha component (0-255) of new color.
         **/
-        void Clear(float red=0.0f, float green=0.0f, float blue=0.0f, float alpha=1.0f);
+        void Clear(Uint8 red=0, Uint8 green=0, Uint8 blue=0, Uint8 alpha=255);
 
+#if GFX_BACKEND == OGL
     /////////////////////////////
     //OpenGL Specific Functions//
     /////////////////////////////
@@ -251,6 +252,7 @@ class ZEngine
             unless you change the OpenGL mode manually.
         **/
         void SetGL2D();
+#endif //GFX_BACKEND
 
     ////////////////////////////////////////////
     //Timer and Framerate Independent Movement//
diff --git a/include/ZE_ZImage.h b/include/ZE_ZImage.h
index 84b2f56..a6fb796 100644
--- a/include/ZE_ZImage.h
+++ b/include/ZE_ZImage.h
@@ -13,7 +13,7 @@
     \brief Definition file for ZImage.
 
     Definition file for ZImage, the OpenGL version of the ZImage class for ZEngine.
-    <br>$Id: ZE_ZImage.h,v 1.19 2003/06/11 00:15:26 cozman Exp $<br>
+    <br>$Id: ZE_ZImage.h,v 1.20 2003/08/01 21:57:32 cozman Exp $<br>
     \author James Turk
 **/
 
@@ -35,6 +35,11 @@ class ZImage
     protected:
         //! Pointer to ZEngine Object
         ZEngine* rEngine;
+        //! Stored texture.
+        SDL_Surface *rImage;
+        //! Stored alpha value for drawing texture.
+        Uint8 rAlpha;
+#if GFX_BACKEND == OGL
         //! Texture lower X, used internally for flip.
         GLfloat rTexMinX;
         //! Texture lower Y, used internally for flip
@@ -43,16 +48,13 @@ class ZImage
         GLfloat rTexMaxX;
         //! Texture Y width ratio, used internally by OpenGL.
         GLfloat rTexMaxY;
-        //! Stored texture for future use.
-        SDL_Surface *rImage;
         //! Texture ID for OpenGL.
         unsigned int rTexID;
         //! Current draw width of Texture.
         unsigned int rWidth;
         //! Current draw height of Texture.
         unsigned int rHeight;
-        //! Stored alpha value for drawing texture.
-        Uint8 rAlpha;
+#endif //GFX_BACKEND == OGL
     
     public:
 
@@ -203,6 +205,47 @@ class ZImage
         **/
         void SetColorKey(Uint8 red, Uint8 green, Uint8 blue);
 
+        /*!
+            \brief Draw Image to Screen.
+
+            Draw Image to screen at specified location.
+            \param x X coord to draw Image to.
+            \param y Y coord to draw Image to.
+        **/
+        void Draw(int x, int y) const;
+
+#if GFX_BACKEND == OGL
+        /*!
+            \brief Draw Image to Screen.
+
+            Draw Image to screen at specified location.
+            \since 0.8.3
+            \param x X coord to draw Image to.
+            \param y Y coord to draw Image to.
+        **/
+        void Draw(float x, float y) const;
+
+        /*!
+            \brief Draw Image rotated to screen.
+
+            Image is rotated about it's own center by specified angle, then drawn to screen.
+            \param x X coord to draw Image to.
+            \param y Y coord to draw Image to.
+            \param angle Angle in degrees to rotate image.
+        **/
+        void DrawRotated(int x, int y, float angle) const;
+
+        /*!
+            \brief Draw Image rotated to screen.
+
+            Image is rotated about it's own center by specified angle, then drawn to screen.
+            \since 0.8.3
+            \param x X coord to draw Image to.
+            \param y Y coord to draw Image to.
+            \param angle Angle in degrees to rotate image.
+        **/
+        void DrawRotated(float x, float y, float angle) const;
+
         /*!
             \brief Flip image over one or both axes.
 
@@ -237,46 +280,7 @@ class ZImage
             Draw uses this but the average user should never need to call this.
         **/
         void Bind() const;
-
-        /*!
-            \brief Draw Image to Screen.
-
-            Draw Image to screen at specified location.
-            \param x X coord to draw Image to.
-            \param y Y coord to draw Image to.
-        **/
-        void Draw(int x, int y) const;
-
-        /*!
-            \brief Draw Image to Screen.
-
-            Draw Image to screen at specified location.
-            \since 0.8.3
-            \param x X coord to draw Image to.
-            \param y Y coord to draw Image to.
-        **/
-        void Draw(float x, float y) const;
-
-        /*!
-            \brief Draw Image rotated to screen.
-
-            Image is rotated about it's own center by specified angle, then drawn to screen.
-            \param x X coord to draw Image to.
-            \param y Y coord to draw Image to.
-            \param angle Angle in degrees to rotate image.
-        **/
-        void DrawRotated(int x, int y, float angle) const;
-
-        /*!
-            \brief Draw Image rotated to screen.
-
-            Image is rotated about it's own center by specified angle, then drawn to screen.
-            \since 0.8.3
-            \param x X coord to draw Image to.
-            \param y Y coord to draw Image to.
-            \param angle Angle in degrees to rotate image.
-        **/
-        void DrawRotated(float x, float y, float angle) const;
+#endif //GFX_BACKEND == OGL
 
         /////////////
         //Accessors//
diff --git a/include/ZE_ZRect.h b/include/ZE_ZRect.h
index 16c5208..2cff327 100644
--- a/include/ZE_ZRect.h
+++ b/include/ZE_ZRect.h
@@ -13,7 +13,7 @@
     \brief Definition file for ZRect.
 
     Definition file for ZRect, the Rectangle class for ZEngine.
-    <br>$Id: ZE_ZRect.h,v 1.11 2003/05/13 01:30:51 cozman Exp $<br>
+    <br>$Id: ZE_ZRect.h,v 1.12 2003/08/01 21:57:32 cozman Exp $<br>
     \author James Turk
 **/
 
@@ -32,7 +32,9 @@ namespace ZE
 **/
 class ZRect
 {
-    protected:  
+    protected:
+        //! Pointer to ZEngine Object
+        ZEngine* rEngine;
         //! X Position of top left corner of rectangle.
         float rX;
         //! Y Position of top left corner of rectangle.
diff --git a/include/external/SDLGL_Util.h b/include/external/SDLGL_Util.h
index 0921df8..36c896a 100755
--- a/include/external/SDLGL_Util.h
+++ b/include/external/SDLGL_Util.h
@@ -6,7 +6,9 @@
 
 #include "ZE_Includes.h"
 
+#if GFX_BACKEND == OGL
 int power_of_two(int input);
 GLuint SDL_GL_LoadTexture(SDL_Surface *surface, GLfloat *texcoord);
+#endif
 
 #endif //__sdlgl_h__