1 /**************************************************************************
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
31 #include "st_context.h"
32 #include "pipe/p_context.h"
37 * Update the viewport transformation matrix. Depends on:
40 * - window pos/size or FBO size
43 update_viewport( struct st_context
*st
)
45 GLcontext
*ctx
= st
->ctx
;
46 GLfloat yScale
, yBias
;
50 if (st_fb_orientation(ctx
->DrawBuffer
) == Y_0_TOP
) {
52 yBias
= ctx
->DrawBuffer
->Height
;
62 GLfloat x
= ctx
->Viewport
.X
;
63 GLfloat y
= ctx
->Viewport
.Y
;
64 GLfloat z
= ctx
->Viewport
.Near
;
65 GLfloat half_width
= ctx
->Viewport
.Width
/ 2.0;
66 GLfloat half_height
= ctx
->Viewport
.Height
/ 2.0;
67 GLfloat half_depth
= (ctx
->Viewport
.Far
- ctx
->Viewport
.Near
) / 2.0;
68 struct pipe_viewport_state vp
;
70 vp
.scale
[0] = half_width
;
71 vp
.scale
[1] = half_height
* yScale
;
72 vp
.scale
[2] = half_depth
;
75 vp
.translate
[0] = half_width
+ x
;
76 vp
.translate
[1] = (half_height
+ y
) * yScale
+ yBias
;
77 vp
.translate
[2] = half_depth
+ z
;
78 vp
.translate
[3] = 0.0;
80 if (memcmp(&vp
, &st
->state
.viewport
, sizeof(vp
)) != 0) {
81 st
->state
.viewport
= vp
;
82 st
->pipe
->set_viewport_state(st
->pipe
, &vp
);
88 const struct st_tracked_state st_update_viewport
= {
89 .name
= "st_update_viewport",
91 .mesa
= _NEW_BUFFERS
| _NEW_VIEWPORT
,
94 .update
= update_viewport