src/mesa/state_tracker/st_atom_viewport.c

   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,
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  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
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  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "main/context.h"
  30 #include "main/viewport.h"
  31 #include "st_context.h"
  32 #include "st_atom.h"
  33 #include "st_util.h"
  34 #include "pipe/p_context.h"
  35 #include "cso_cache/cso_context.h"
  36
  37 /**
  38  * Update the viewport transformation matrix.  Depends on:
  39  *  - viewport pos/size
  40  *  - depthrange
  41  *  - window pos/size or FBO size
  42  */
  43 void
  44 st_update_viewport( struct st_context *st )
  45 {
  46    struct gl_context *ctx = st->ctx;
  47    unsigned i;
  48
  49    /* _NEW_VIEWPORT
  50     */
  51    for (i = 0; i < st->state.num_viewports; i++) {
  52       float *scale = st->state.viewport[i].scale;
  53       float *translate = st->state.viewport[i].translate;
  54
  55       _mesa_get_viewport_xform(ctx, i, scale, translate);
  56
  57       /* _NEW_BUFFERS */
  58       /* Drawing to a window where the coordinate system is upside down. */
  59       if (st->state.fb_orientation == Y_0_TOP) {
  60          scale[1] *= -1;
  61          translate[1] = st->state.fb_height - translate[1];
  62       }
  63    }
  64
  65    cso_set_viewport(st->cso_context, &st->state.viewport[0]);
  66
  67    if (st->state.num_viewports > 1) {
  68       struct pipe_context *pipe = st->pipe;
  69
  70       pipe->set_viewport_states(pipe, 1, st->state.num_viewports - 1,
  71                                 &st->state.viewport[1]);
  72    }
  73 }