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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 (at) vmware.com>
     31   */
     32 
     33 
     34 #include "st_context.h"
     35 #include "pipe/p_context.h"
     36 #include "st_atom.h"
     37 #include "st_program.h"
     38 #include "util/u_debug.h"
     39 #include "cso_cache/cso_context.h"
     40 
     41 
     42 /* Second state atom for user clip planes:
     43  */
     44 static void update_clip( struct st_context *st )
     45 {
     46    struct pipe_clip_state clip;
     47    const struct gl_context *ctx = st->ctx;
     48    bool use_eye = FALSE;
     49 
     50    STATIC_ASSERT(sizeof(clip.ucp) <= sizeof(ctx->Transform._ClipUserPlane));
     51 
     52    /* if we have a vertex shader that writes clip vertex we need to pass
     53       the pre-projection transformed coordinates into the driver. */
     54    if (st->vp) {
     55       if (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX])
     56          use_eye = TRUE;
     57    }
     58 
     59    /* _ClipUserPlane = _NEW_TRANSFORM | _NEW_PROJECTION
     60     * EyeUserPlane = _NEW_TRANSFORM
     61     */
     62    memcpy(clip.ucp,
     63           use_eye ? ctx->Transform.EyeUserPlane
     64                   : ctx->Transform._ClipUserPlane, sizeof(clip.ucp));
     65 
     66    if (memcmp(&st->state.clip, &clip, sizeof(clip)) != 0) {
     67       st->state.clip = clip;
     68       st->pipe->set_clip_state(st->pipe, &clip);
     69    }
     70 }
     71 
     72 
     73 const struct st_tracked_state st_update_clip = {
     74    update_clip						/* update */
     75 };
     76