diff --git a/src/opengl.c b/src/opengl.c
index 7240184..f82eaa1 100644
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -320,13 +320,17 @@ SDL_Surface* gl_prepareSurface(SDL_Surface* surface) {
   return surface;
 }
 
-/*
- * Return the texture id.
- * Stores real sizes in rw/rh (from POT padding).
+/**
+ * @brief Load a surface into an opengl texture.
+ *    @param surface Surface to load into a texture.
+ *    @param[out] rw Real width of the texture.
+ *    @param[out] rh Real height of the texture.
+ *    @return The opengl texture id.
  */
 static GLuint gl_loadSurface(SDL_Surface* surface, int *rw, int* rh) {
   GLuint texture;
 
+  /* Prepare the surface. */
   surface = gl_prepareSurface(surface);
   if(rw != NULL) (*rw) = surface->w;
   if(rh != NULL) (*rh) = surface->h;
@@ -337,8 +341,13 @@ static GLuint gl_loadSurface(SDL_Surface* surface, int *rw, int* rh) {
 
   /* Filtering, LINEAR is better for scaling, nearest looks nicer, LINEAR */
   /* also seems to create a bit of artifacts around the edges. */
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  if(gl_screen.scale != 1.) {
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  } else {
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 
+  }
 
   /* Always wrap just in case. */
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
@@ -358,7 +367,11 @@ static GLuint gl_loadSurface(SDL_Surface* surface, int *rw, int* rh) {
   return texture;
 }
 
-/* Load the SDL_Surface to an openGL texture. */
+/**
+ * @brief Load the SDL_Surface to a glTexture.
+ *    @param surface Surface to load.
+ *    @return The glTexture for surface.
+ */
 glTexture* gl_loadImage(SDL_Surface* surface) {
   int rw, rh;
 
@@ -382,7 +395,13 @@ glTexture* gl_loadImage(SDL_Surface* surface) {
   return texture;
 }
 
-/* Load the image if not already done. */
+/**
+ * @brief Load an image as a texture.
+ *
+ * May not necessarily load the image but use one of it's already open.
+ *    @param path Image to load.
+ *    @return Texture loaded from image.
+ */
 glTexture* gl_newImage(const char* path) {
   glTexList* cur, *last;
 
@@ -414,11 +433,15 @@ glTexture* gl_newImage(const char* path) {
   return cur->tex;
 }
 
-/* Load the image as an opengl texture directly. */
+/**
+ * @brief Only loads the image, does not add to stack unlike gl_newImage.
+ *    @param path Image to load.
+ *    @return Texture loaded from image.
+ */
 static glTexture* gl_loadNewImage(const char* path) {
   SDL_Surface* tmp, *surface;
   glTexture* t;
-  uint8_t* trans = NULL;
+  uint8_t* trans;
   uint32_t filesize;
   char* buf;
 
@@ -463,7 +486,13 @@ static glTexture* gl_loadNewImage(const char* path) {
   return t;
 }
 
-/* Load the texture immediately, but also set is as a sprite. */
+/**
+ * @brief Load the texture immediately, but also set it as a sprite.
+ *    @param path Image to load.
+ *    @param sx Number of X sprites in image.
+ *    @param sy Number of Y sprites in image.
+ *    @return Texture loaded.
+ */
 glTexture* gl_newSprite(const char* path, const int sx, const int sy) {
   glTexture* texture;
   if((texture = gl_newImage(path)) == NULL)
@@ -480,7 +509,10 @@ glTexture* gl_newSprite(const char* path, const int sx, const int sy) {
   return texture;
 }
 
-/* Free the texture. */
+/**
+ * @brief Free a texture.
+ *    @param texture Texture to free.
+ */
 void gl_freeTexture(glTexture* texture) {
   glTexList* cur, *last;
 
@@ -530,12 +562,27 @@ void gl_freeTexture(glTexture* texture) {
   gl_checkErr();
 }
 
-/* Return true if pixel at pos (x,y) is transparent. */
+/**
+ * @brief Check to see if a pixel is transparent in a texture.
+ *    @param t Texture to check for transparency.
+ *    @param x X position of the pixel.
+ *    @param y Y position of the pixel.
+ *    @return 1 if the pixel is transparent or 0 if it isn't.
+ */
 int gl_isTrans(const glTexture* t, const int x, const int y) {
   return !(t->trans[(y*(int)(t->w)+x)/8] & (1<<((y*(int)(t->w)+x)%8)));
 }
 
-/* Set x and y to be the appropriate sprite for glTexture using dir. */
+/**
+ * @brief Set x and y to be the appropriate sprite for glTexture using dir.
+ *
+ * Very slow, try to cache if possible, like the pilots do instead of using
+ * in O(n^2) or worse functions.
+ *    @param[out] x X sprite to use.
+ *    @param[out] y Y sprite to use.
+ *    @param t Texture to get sprite from.
+ *    @param dir Direction to get sprite from.
+ */
 void gl_getSpriteFromDir(int* x, int* y, const glTexture* t, const double dir) {
   int s, sx, sy;
 
@@ -563,6 +610,15 @@ void gl_getSpriteFromDir(int* x, int* y, const glTexture* t, const double dir) {
 /* BLITTING! */
 /* ================ */
 
+/**
+ * @brief Blits a texture.
+ *    @param texture Texture to blit.
+ *    @param x X position of the texture on the screen.
+ *    @param y Y position of the texture on the screen.
+ *    @param tx X position within the texture.
+ *    @param ty Y position within the texture.
+ *    @param c Colour to use (modifies texture colour).
+ */
 static void gl_blitTexture(const glTexture* texture,
     const double x, const double y,
     const double tx, const double ty, const glColour* c) {
@@ -598,7 +654,15 @@ static void gl_blitTexture(const glTexture* texture,
   gl_checkErr();
 }
 
-/* Blit the sprite at given position. */
+/**
+ * @brief Blits a sprite, position is relative to the player.
+ *    @param texture Sprite to blit.
+ *    @param bx X position of the texture relative to the player.
+ *    @param by Y position of the texture relative to the player.
+ *    @param sx X position of the sprite to use.
+ *    @param sy Y position of the sprite to use.
+ *    @param c Colour to use (modifies texture colour).
+ */
 void gl_blitSprite(const glTexture* sprite, const double bx, const double by,
                    const int sx, const int sy, const glColour* c) {
 
@@ -621,7 +685,15 @@ void gl_blitSprite(const glTexture* sprite, const double bx, const double by,
   gl_blitTexture(sprite, x, y, tx, ty, c);
 }
 
-/* Blit the sprite at pos (blits absolute position). */
+/**
+ * @brief Blits a sprite, position is in absolute screen coordinates.
+ *    @param texture Sprite to blit.
+ *    @param bx X position of the texture in screen coordinates.
+ *    @param by Y position of the texture in screen coordinates.
+ *    @param sx X position of the sprite to use.
+ *    @param sy Y position of the sprite to use.
+ *    @param c Colour to use (modifies texture colour).
+ */
 void gl_blitStaticSprite(const glTexture* sprite, const double bx,
     const double by, const int sx, const int sy, const glColour* c) {
   
@@ -638,7 +710,14 @@ void gl_blitStaticSprite(const glTexture* sprite, const double bx,
   gl_blitTexture(sprite, x, y, tx, ty, c); 
 }
 
-/* Like gl_blitStatic but scales to size. */
+/**
+ * @brief Blit a texture scaling it.
+ *    @param bx X position of the texture in screen coordinates.
+ *    @param by Y position of the texture in screen coordinates.
+ *    @param bw Width to scale to.
+ *    @param bh Height to scale to.
+ *    @param c Colour to use (modifies texture colour).
+ */
 void gl_blitScale(const glTexture* texture,
     const double bx, const double by,
     const double bw, const double bh, const glColour* c) {
@@ -681,7 +760,13 @@ void gl_blitScale(const glTexture* texture,
   gl_checkErr();
 }
 
-/* Just straight out blit the thing at position. */
+/**
+ * @brief Blits a texture to a position
+ *    @param texture Texture to blit.
+ *    @param bx X position of the texture in screen coordinates.
+ *    @param by Y position of the texture in screen coordinates.
+ *    @param c Colour to use (modifies texture colour).
+ */
 void gl_blitStatic(const glTexture* texture, const double bx, const double by,
                    const glColour* c) {
   double x, y;
@@ -694,12 +779,23 @@ void gl_blitStatic(const glTexture* texture, const double bx, const double by,
   gl_blitTexture(texture, x, y, 0, 0, c);
 }
 
-/* Bind our precious camera to a vector. */
-void gl_bindCamera(const Vec2* pos) {
-  gl_camera = (Vec2*)pos;
+/**
+ * @brief Bind the camera to a vector.
+ *  
+ * All stuff displayed with relative functions will be affected by the camera's
+ * position. Does not affect stuff in screen coordinates.
+ *    @param pos Vector to use as camera.
+ */
+void gl_bindCamera(Vec2* pos) {
+  gl_camera = pos;
 }
 
-/* Draw circles. */
+/**
+ * @brief Draws a circle.
+ *    @param cx X position of the center in screen coordinates.
+ *    @param cy Y position of the center in screen coordinates.
+ *    @param r Radius of the circle.
+ */
 void gl_drawCircle(const double cx, const double cy, const double r) {
   double x, y, p;
 
@@ -746,11 +842,23 @@ void gl_drawCircle(const double cx, const double cy, const double r) {
   gl_checkErr();
 }
 
-/* Draw a cirlce in a rect. */
+/**
+ * @brief Only displays the pixel if it's in the screen.
+ */
 #define PIXEL(x,y) \
   if((x>rx) && (y>ry) && (x<rxw) && (y<ryh)) \
   glVertex2d(x,y)
 
+/**
+ * @brief Draw a circle in a rectangle.
+ *    @param cx X position of the center in screen coordinates.
+ *    @param cy Y position of the center in screen coordinates.
+ *    @param r Radius of the circle.
+ *    @param rx X position of the rectangle limiting the circle in screen coords.
+ *    @param ry Y position of the rectangle limiting the circle in screen coords.
+ *    @param rw Width of the limiting rectangle.
+ *    @param rh Height of the limiting rectangle.
+ */
 void gl_drawCircleInRect(const double cx, const double cy, const double r,
                          const double rx, const double ry, const double rw, const double rh) {
 
@@ -975,7 +1083,7 @@ int gl_init(void) {
          "  going to try to create it anyway...",
          SCREEN_W, SCREEN_H, gl_screen.depth);
   if(depth != gl_screen.depth)
-    LOG("Depth: %d bpp unavailable, will use %d bpp", gl_screen.depth, depth);
+    DEBUG("Depth: %d bpp unavailable, will use %d bpp", gl_screen.depth, depth);
 
   gl_screen.depth = depth;
 
@@ -1001,6 +1109,7 @@ int gl_init(void) {
   SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER,        &doublebuf);
   SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES,  &fsaa);
   if(doublebuf) gl_screen.flags |= OPENGL_DOUBLEBUF;
+  /* Calculate real depth. */
   gl_screen.depth = gl_screen.r + gl_screen.g + gl_screen.b + gl_screen.a;
 
   /* Get info about some extensions. */
@@ -1038,29 +1147,35 @@ int gl_init(void) {
   /* Some openGL options. */
   glClearColor(0., 0., 0., 1.);
 
-  /* Enable/Disable. */
+  /* Set default opengl state. */
   glDisable(GL_DEPTH_TEST);   /* Set for doing 2D shidazles. */
   /*glEnable(GL_TEXTURE_2D);  // Don't enable globally, it will break non-texture blits. */
   glDisable(GL_LIGHTING);     /* No lighting, it is done when rendered. */
   glEnable(GL_BLEND);         /* Alpha blending ftw. */
 
-  /* Models. */
+  /* Set the blending/shading model to use. */
   glShadeModel(GL_FLAT);      /* Default shade model. Functions should keep this when done.. */
   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); /* Good blend model. */
 
   /* Set up the proper viewport to use. */
   gl_screen.rw = SCREEN_W;
   gl_screen.rh = SCREEN_H;
+  gl_screen.scale = 1.;
   if((SCREEN_W < 640) && (SCREEN_W <= SCREEN_H)) {
+    gl_screen.scale = (double)gl_screen.w / 640.;
+    /* Must keep the proportion the same for the screen. */
     gl_screen.w   = (gl_screen.w  * 640)      / SCREEN_H;
     gl_screen.rw  = (gl_screen.rw * SCREEN_H) / 640;
     gl_screen.h   = 640;
   }
   else if((SCREEN_W < 640) && (SCREEN_W >= SCREEN_H)) {
+    gl_screen.scale = (double)gl_screen.h / 640.;
+    /* Must keep the proportion the same for the screen. */
     gl_screen.w   = (gl_screen.w  * 640)      / SCREEN_H;
     gl_screen.rw  = (gl_screen.rw * SCREEN_H) / 640;
     gl_screen.h   = 640; 
   }
+  /* Handle setting the default viewport. */
   gl_defViewport();
 
   /* Finishing touches. */
@@ -1070,7 +1185,9 @@ int gl_init(void) {
   return 0;
 }
 
-/* Reset viewport to default. */
+/**
+ * @brief Reset viewport to default.
+ */
 void gl_defViewport(void) {
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
@@ -1081,8 +1198,8 @@ void gl_defViewport(void) {
           -1.,            /* Near. */
           1.);            /* Far. */
   /* Take into account possible scaling. */
-  glScaled((double)gl_screen.w / (double)gl_screen.rw,
-      (double)gl_screen.h / (double)gl_screen.rh, 1.);
+  if(gl_screen.scale != 1.)
+    glScaled(gl_screen.scale, gl_screen.scale, 1.);
 }
 
 /**
diff --git a/src/opengl.h b/src/opengl.h
index 17d22ea..583d64c 100644
--- a/src/opengl.h
+++ b/src/opengl.h
@@ -42,6 +42,7 @@ typedef struct glInfo_ {
   int h;            /**< Window viewport height. */
   int rw;           /**< Real window width. */
   int rh;           /**< Real window height. */
+  double scale;     /**< Scale factor. */
   int depth;        /**< Depth in bpp. */
   int r;            /**< Amount of red bits. */
   int g;            /**< Amount of green bits. */
@@ -117,7 +118,7 @@ void gl_blitStatic(const glTexture* texture, const double bx, const double by,
 				   const glColour* c);
 
 /* Bind the camera to a vector. */
-void gl_bindCamera(const Vec2* pos);
+void gl_bindCamera(Vec2* pos);
 
 /* Circle drawing. */
 void gl_drawCircle(const double x, const double y, const double r);