1 /**************************************************************************
3 * Copyright 2007 VMware, Inc.
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 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.
26 **************************************************************************/
29 #include "main/context.h"
30 #include "main/viewport.h"
31 #include "st_context.h"
33 #include "pipe/p_context.h"
34 #include "cso_cache/cso_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 struct gl_context
*ctx
= st
->ctx
;
46 GLfloat yScale
, yBias
;
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.
55 yBias
= (GLfloat
)ctx
->DrawBuffer
->Height
;
58 /* Drawing to an FBO where Y=0=BOTTOM, like OpenGL - don't invert */
65 for (i
= 0; i
< ctx
->Const
.MaxViewports
; i
++)
67 float scale
[3], translate
[3];
68 _mesa_get_viewport_xform(ctx
, i
, scale
, translate
);
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];
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];
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]);
85 const struct st_tracked_state st_update_viewport
= {
86 update_viewport
/* update */