src/mesa/state_tracker/st_cb_readpixels.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "main/imports.h"
  30 #include "main/readpix.h"
  31
  32 #include "st_atom.h"
  33 #include "st_context.h"
  34 #include "st_cb_bitmap.h"
  35 #include "st_cb_readpixels.h"
  36
  37
  38 /**
  39  * The only special thing we need to do for the state tracker's
  40  * glReadPixels is to validate state (to be sure we have up-to-date
  41  * framebuffer surfaces) and flush the bitmap cache prior to reading.
  42  */
  43 static void
  44 st_readpixels(struct gl_context *ctx, GLint x, GLint y,
  45               GLsizei width, GLsizei height,
  46               GLenum format, GLenum type,
  47               const struct gl_pixelstore_attrib *pack,
  48               GLvoid *dest)
  49 {
  50    struct st_context *st = st_context(ctx);
  51
  52    st_validate_state(st);
  53    st_flush_bitmap_cache(st);
  54    _mesa_readpixels(ctx, x, y, width, height, format, type, pack, dest);
  55 }
  56
  57
  58 void st_init_readpixels_functions(struct dd_function_table *functions)
  59 {
  60    functions->ReadPixels = st_readpixels;
  61 }