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  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
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  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.   * \brief polygon stipple state
  30.   *
  31.   * Authors:
  32.   *   Brian Paul
  33.   */
  34.  
  35.  
  36. #include <assert.h>
  37.  
  38. #include "st_context.h"
  39. #include "st_atom.h"
  40. #include "pipe/p_context.h"
  41. #include "pipe/p_defines.h"
  42.  
  43.  
  44. /**
  45.  * OpenGL's polygon stipple is indexed with window coordinates in which
  46.  * the origin (0,0) is the lower-left corner of the window.
  47.  * With Gallium, the origin is the upper-left corner of the window.
  48.  * To convert GL's polygon stipple to what gallium expects we need to
  49.  * invert the pattern vertically and rotate the stipple rows according
  50.  * to the window height.
  51.  */
  52. static void
  53. invert_stipple(GLuint dest[32], const GLuint src[32], GLuint winHeight)
  54. {
  55.    GLuint i;
  56.  
  57.    for (i = 0; i < 32; i++) {
  58.       dest[i] = src[(winHeight - 1 - i) & 0x1f];
  59.    }
  60. }
  61.  
  62.  
  63.  
  64. static void
  65. update_stipple( struct st_context *st )
  66. {
  67.    const GLuint sz = sizeof(st->state.poly_stipple);
  68.    assert(sz == sizeof(st->ctx->PolygonStipple));
  69.  
  70.    if (memcmp(st->state.poly_stipple, st->ctx->PolygonStipple, sz)) {
  71.       /* state has changed */
  72.       struct pipe_poly_stipple newStipple;
  73.  
  74.       memcpy(st->state.poly_stipple, st->ctx->PolygonStipple, sz);
  75.  
  76.       invert_stipple(newStipple.stipple, st->ctx->PolygonStipple,
  77.                      st->ctx->DrawBuffer->Height);
  78.  
  79.       st->pipe->set_polygon_stipple(st->pipe, &newStipple);
  80.    }
  81. }
  82.  
  83.  
  84. /** Update the stipple when the pattern or window height changes */
  85. const struct st_tracked_state st_update_polygon_stipple = {
  86.    "st_update_polygon_stipple",                         /* name */
  87.    {                                                    /* dirty */
  88.       (_NEW_POLYGONSTIPPLE |
  89.        _NEW_BUFFERS),                                   /* mesa */
  90.       0,                                                /* st */
  91.    },
  92.    update_stipple                                       /* update */
  93. };
  94.