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#include "main/context.h"
30#include "main/viewport.h"
31#include "st_context.h"
32#include "st_atom.h"
33#include "pipe/p_context.h"
34#include "cso_cache/cso_context.h"
35
36/**
37 * Update the viewport transformation matrix.  Depends on:
38 *  - viewport pos/size
39 *  - depthrange
40 *  - window pos/size or FBO size
41 */
42static void
43update_viewport( struct st_context *st )
44{
45   struct gl_context *ctx = st->ctx;
46   GLfloat yScale, yBias;
47   unsigned i;
48   /* _NEW_BUFFERS
49    */
50   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
51      /* Drawing to a window.  The corresponding gallium surface uses
52       * Y=0=TOP but OpenGL is Y=0=BOTTOM.  So we need to invert the viewport.
53       */
54      yScale = -1;
55      yBias = (GLfloat)ctx->DrawBuffer->Height;
56   }
57   else {
58      /* Drawing to an FBO where Y=0=BOTTOM, like OpenGL - don't invert */
59      yScale = 1.0;
60      yBias = 0.0;
61   }
62
63   /* _NEW_VIEWPORT
64    */
65   for (i = 0; i < ctx->Const.MaxViewports; i++)
66   {
67      float scale[3], translate[3];
68      _mesa_get_viewport_xform(ctx, i, scale, translate);
69
70      st->state.viewport[i].scale[0] = scale[0];
71      st->state.viewport[i].scale[1] = scale[1] * yScale;
72      st->state.viewport[i].scale[2] = scale[2];
73
74      st->state.viewport[i].translate[0] = translate[0];
75      st->state.viewport[i].translate[1] = translate[1] * yScale + yBias;
76      st->state.viewport[i].translate[2] = translate[2];
77   }
78
79   cso_set_viewport(st->cso_context, &st->state.viewport[0]);
80   if (ctx->Const.MaxViewports > 1)
81      st->pipe->set_viewport_states(st->pipe, 1, ctx->Const.MaxViewports - 1, &st->state.viewport[1]);
82}
83
84
85const struct st_tracked_state st_update_viewport = {
86   update_viewport					/* update */
87};
88