| /************************************************************************** |
| * |
| * 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 "intel_context.h" |
| #include "macros.h" |
| |
| GLuint intel_compressed_alignment(GLenum internalFormat) |
| { |
| GLuint alignment = 4; |
| |
| switch (internalFormat) { |
| case GL_COMPRESSED_RGB_FXT1_3DFX: |
| case GL_COMPRESSED_RGBA_FXT1_3DFX: |
| alignment = 8; |
| break; |
| |
| default: |
| break; |
| } |
| |
| return alignment; |
| } |
| |
| 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; |
| |
| if (mt->compressed) { |
| align_w = intel_compressed_alignment(mt->internal_format); |
| mt->pitch = ALIGN(mt->width0, align_w); |
| } |
| |
| /* 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; |
| |
| if (mt->compressed) { |
| mip1_width = ALIGN(minify(mt->width0), align_w) |
| + ALIGN(minify(minify(mt->width0)), align_w); |
| } else { |
| mip1_width = ALIGN(minify(mt->width0), align_w) |
| + minify(minify(mt->width0)); |
| } |
| |
| if (mip1_width > mt->pitch) { |
| 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); |
| } |
| } |