1 files changed, 102 insertions, 0 deletions
diff --git a/shared/intel_tex_layout.c b/shared/intel_tex_layout.c
new file mode 100644
index 0000000..39a443c
--- /dev/null
+++ b/shared/intel_tex_layout.c
@@ -0,0 +1,102 @@
+/**************************************************************************
+ * 
+ * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+ /*
+  * Authors:
+  *   Keith Whitwell <keith@tungstengraphics.com>
+  *   Michel Dänzer <michel@tungstengraphics.com>
+  */
+
+#include "intel_mipmap_tree.h"
+#include "intel_tex_layout.h"
+#include "macros.h"
+
+
+static int align(int value, int alignment)
+{
+   return (value + alignment - 1) & ~(alignment - 1);
+}
+
+void i945_miptree_layout_2d( struct intel_context *intel, struct intel_mipmap_tree *mt )
+{
+   GLint align_h = 2, align_w = 4;
+   GLuint level;
+   GLuint x = 0;
+   GLuint y = 0;
+   GLuint width = mt->width0;
+   GLuint height = mt->height0;
+
+   mt->pitch = mt->width0;
+
+   /* May need to adjust pitch to accomodate the placement of
+    * the 2nd mipmap.  This occurs when the alignment
+    * constraints of mipmap placement push the right edge of the
+    * 2nd mipmap out past the width of its parent.
+    */
+   if (mt->first_level != mt->last_level) {
+      GLuint mip1_width = align(minify(mt->width0), align_w)
+			+ minify(minify(mt->width0));
+
+      if (mip1_width > mt->width0)
+	 mt->pitch = mip1_width;
+   }
+
+   /* Pitch must be a whole number of dwords, even though we
+    * express it in texels.
+    */
+   mt->pitch = intel_miptree_pitch_align (intel, mt, mt->pitch);
+   mt->total_height = 0;
+
+   for ( level = mt->first_level ; level <= mt->last_level ; level++ ) {
+      GLuint img_height;
+
+      intel_miptree_set_level_info(mt, level, 1, x, y, width, 
+				   height, 1);
+
+      if (mt->compressed)
+	 img_height = MAX2(1, height/4);
+      else
+	 img_height = align(height, align_h);
+
+
+      /* Because the images are packed better, the final offset
+       * might not be the maximal one:
+       */
+      mt->total_height = MAX2(mt->total_height, y + img_height);
+
+      /* Layout_below: step right after second mipmap.
+       */
+      if (level == mt->first_level + 1) {
+	 x += align(width, align_w);
+      }
+      else {
+	 y += img_height;
+      }
+
+      width  = minify(width);
+      height = minify(height);
+   }
+}