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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2007 VMware, Inc.
  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 VMWARE 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.   * Authors:
  30.   *   Keith Whitwell <keithw@vmware.com>
  31.   */
  32.  
  33.  
  34. #include "main/macros.h"
  35. #include "st_context.h"
  36. #include "pipe/p_context.h"
  37. #include "st_atom.h"
  38.  
  39.  
  40. /**
  41.  * Scissor depends on the scissor box, and the framebuffer dimensions.
  42.  */
  43. static void
  44. update_scissor( struct st_context *st )
  45. {
  46.    struct pipe_scissor_state scissor[PIPE_MAX_VIEWPORTS];
  47.    const struct gl_context *ctx = st->ctx;
  48.    const struct gl_framebuffer *fb = ctx->DrawBuffer;
  49.    GLint miny, maxy;
  50.    unsigned i;
  51.    bool changed = false;
  52.    for (i = 0 ; i < ctx->Const.MaxViewports; i++) {
  53.       scissor[i].minx = 0;
  54.       scissor[i].miny = 0;
  55.       scissor[i].maxx = fb->Width;
  56.       scissor[i].maxy = fb->Height;
  57.  
  58.       if (ctx->Scissor.EnableFlags & (1 << i)) {
  59.          /* need to be careful here with xmax or ymax < 0 */
  60.          GLint xmax = MAX2(0, ctx->Scissor.ScissorArray[i].X + ctx->Scissor.ScissorArray[i].Width);
  61.          GLint ymax = MAX2(0, ctx->Scissor.ScissorArray[i].Y + ctx->Scissor.ScissorArray[i].Height);
  62.  
  63.          if (ctx->Scissor.ScissorArray[i].X > (GLint)scissor[i].minx)
  64.             scissor[i].minx = ctx->Scissor.ScissorArray[i].X;
  65.          if (ctx->Scissor.ScissorArray[i].Y > (GLint)scissor[i].miny)
  66.             scissor[i].miny = ctx->Scissor.ScissorArray[i].Y;
  67.  
  68.          if (xmax < (GLint) scissor[i].maxx)
  69.             scissor[i].maxx = xmax;
  70.          if (ymax < (GLint) scissor[i].maxy)
  71.             scissor[i].maxy = ymax;
  72.          
  73.          /* check for null space */
  74.          if (scissor[i].minx >= scissor[i].maxx || scissor[i].miny >= scissor[i].maxy)
  75.             scissor[i].minx = scissor[i].miny = scissor[i].maxx = scissor[i].maxy = 0;
  76.       }
  77.  
  78.       /* Now invert Y if needed.
  79.        * Gallium drivers use the convention Y=0=top for surfaces.
  80.        */
  81.       if (st_fb_orientation(fb) == Y_0_TOP) {
  82.          miny = fb->Height - scissor[i].maxy;
  83.          maxy = fb->Height - scissor[i].miny;
  84.          scissor[i].miny = miny;
  85.          scissor[i].maxy = maxy;
  86.       }
  87.  
  88.       if (memcmp(&scissor[i], &st->state.scissor[i], sizeof(scissor[0])) != 0) {
  89.          /* state has changed */
  90.          st->state.scissor[i] = scissor[i];  /* struct copy */
  91.          changed = true;
  92.       }
  93.    }
  94.    if (changed)
  95.       st->pipe->set_scissor_states(st->pipe, 0, ctx->Const.MaxViewports, scissor); /* activate */
  96. }
  97.  
  98.  
  99. const struct st_tracked_state st_update_scissor = {
  100.    "st_update_scissor",                                 /* name */
  101.    {                                                    /* dirty */
  102.       (_NEW_SCISSOR | _NEW_BUFFERS),                    /* mesa */
  103.       0,                                                /* st */
  104.    },
  105.    update_scissor                                       /* update */
  106. };
  107.