X-Git-Url: https://git.jsancho.org/?a=blobdiff_plain;f=gacela_draw.lisp;h=2e9ddbaf005ff06972684fb8eab94f70864b37e2;hb=66161b212a87260a997193821426f06bca51da7b;hp=40a6c4ccf0a5e7bbab41da7f4a01f587f000b267;hpb=84698444ef733ef255a1a8d7bf3830b73f97bbe7;p=gacela.git

diff --git a/gacela_draw.lisp b/gacela_draw.lisp
index 40a6c4c..2e9ddba 100644
--- a/gacela_draw.lisp
+++ b/gacela_draw.lisp
@@ -54,19 +54,37 @@
 (defun draw-color (color)
   (apply #'glColor3f color))
 
-(defun load-texture (filename &optional (min-filter GL_LINEAR) (mag-filter GL_LINEAR))
-  (init-textures)
+(defun load-image-for-texture (filename)
   (init-video-mode)
   (let ((image (IMG_Load filename)))
     (cond ((/= image 0)
-	   (let ((width (surface-w image)) (height (surface-h image))
-		 (texture (car (glGenTextures 1))))
-	     (glBindTexture GL_TEXTURE_2D texture)
-	     (glTexImage2D GL_TEXTURE_2D 0 3 width height 0 GL_RGB GL_UNSIGNED_BYTE (surface-pixels image))
-	     (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER min-filter)
-	     (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER mag-filter)
-	     (SDL_FreeSurface image)
-	     (values texture width height))))))
+	   (let* ((width (surface-w image)) (height (surface-h image))
+		  (power-2 (nearest-power-of-two (min width height)))
+		  (zoomx (/ power-2 width)) (zoomy (/ power-2 height))
+		  zoomed-image)
+	     (cond ((and (= zoomx 1) (= zoomy 1)) (values image width height))
+		   (t (setq zoomed-image (zoomSurface image zoomx zoomy 0))
+		      (SDL_FreeSurface image)
+		      (cond ((/= zoomed-image 0) (values zoomed-image width height))))))))))
+
+(defun load-texture (filename &optional (min-filter GL_LINEAR) (mag-filter GL_LINEAR))
+  (init-textures)
+  (init-video-mode)
+  (multiple-value-bind
+   (image real-w real-h) (load-image-for-texture filename)
+        (cond (image
+	       (let ((width (surface-w image)) (height (surface-h image))
+		     (byteorder (if (= (SDL_ByteOrder) SDL_LIL_ENDIAN)
+				    (if (= (surface-format-BytesPerPixel image) 3) GL_BGR GL_BGRA)
+				    (if (= (surface-format-BytesPerPixel image) 3) GL_RGB GL_RGBA)))
+
+		     (texture (car (glGenTextures 1))))
+		 (glBindTexture GL_TEXTURE_2D texture)
+		 (glTexImage2D GL_TEXTURE_2D 0 3 width height 0 byteorder GL_UNSIGNED_BYTE (surface-pixels image))
+		 (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER min-filter)
+		 (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER mag-filter)
+		 (SDL_FreeSurface image)
+		 (values texture real-w real-h))))))
 
 (defun draw-image-function (filename)
   (multiple-value-bind
@@ -126,4 +144,4 @@
   (cond (zrot (glRotatef zrot 0 0 1))))
 
 (defun enable (&key textures)
-  (cond (textures (glEnable GL_TEXTURE_2D))))
\ No newline at end of file
+  (cond (textures (glEnable GL_TEXTURE_2D))))