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 **************************************************************************/
30 * Keith Whitwell <keithw@vmware.com>
34 #include "main/macros.h"
35 #include "main/framebuffer.h"
36 #include "st_context.h"
37 #include "pipe/p_context.h"
43 * Scissor depends on the scissor box, and the framebuffer dimensions.
46 st_update_scissor( struct st_context
*st
)
48 struct pipe_scissor_state scissor
[PIPE_MAX_VIEWPORTS
];
49 const struct gl_context
*ctx
= st
->ctx
;
50 const struct gl_framebuffer
*fb
= ctx
->DrawBuffer
;
51 const unsigned int fb_width
= _mesa_geometric_width(fb
);
52 const unsigned int fb_height
= _mesa_geometric_height(fb
);
57 for (i
= 0 ; i
< st
->state
.num_viewports
; i
++) {
60 scissor
[i
].maxx
= fb_width
;
61 scissor
[i
].maxy
= fb_height
;
63 if (ctx
->Scissor
.EnableFlags
& (1 << i
)) {
64 /* need to be careful here with xmax or ymax < 0 */
65 GLint xmax
= MAX2(0, ctx
->Scissor
.ScissorArray
[i
].X
+ ctx
->Scissor
.ScissorArray
[i
].Width
);
66 GLint ymax
= MAX2(0, ctx
->Scissor
.ScissorArray
[i
].Y
+ ctx
->Scissor
.ScissorArray
[i
].Height
);
68 if (ctx
->Scissor
.ScissorArray
[i
].X
> (GLint
)scissor
[i
].minx
)
69 scissor
[i
].minx
= ctx
->Scissor
.ScissorArray
[i
].X
;
70 if (ctx
->Scissor
.ScissorArray
[i
].Y
> (GLint
)scissor
[i
].miny
)
71 scissor
[i
].miny
= ctx
->Scissor
.ScissorArray
[i
].Y
;
73 if (xmax
< (GLint
) scissor
[i
].maxx
)
74 scissor
[i
].maxx
= xmax
;
75 if (ymax
< (GLint
) scissor
[i
].maxy
)
76 scissor
[i
].maxy
= ymax
;
78 /* check for null space */
79 if (scissor
[i
].minx
>= scissor
[i
].maxx
|| scissor
[i
].miny
>= scissor
[i
].maxy
)
80 scissor
[i
].minx
= scissor
[i
].miny
= scissor
[i
].maxx
= scissor
[i
].maxy
= 0;
83 /* Now invert Y if needed.
84 * Gallium drivers use the convention Y=0=top for surfaces.
86 if (st
->state
.fb_orientation
== Y_0_TOP
) {
87 miny
= fb
->Height
- scissor
[i
].maxy
;
88 maxy
= fb
->Height
- scissor
[i
].miny
;
89 scissor
[i
].miny
= miny
;
90 scissor
[i
].maxy
= maxy
;
93 if (memcmp(&scissor
[i
], &st
->state
.scissor
[i
], sizeof(scissor
[0])) != 0) {
94 /* state has changed */
95 st
->state
.scissor
[i
] = scissor
[i
]; /* struct copy */
101 struct pipe_context
*pipe
= st
->pipe
;
103 pipe
->set_scissor_states(pipe
, 0, st
->state
.num_viewports
, scissor
);
108 st_update_window_rectangles(struct st_context
*st
)
110 struct pipe_scissor_state new_rects
[PIPE_MAX_WINDOW_RECTANGLES
];
111 const struct gl_context
*ctx
= st
->ctx
;
112 const struct gl_scissor_attrib
*scissor
= &ctx
->Scissor
;
114 bool changed
= false;
115 unsigned num_rects
= scissor
->NumWindowRects
;
116 bool include
= scissor
->WindowRectMode
== GL_INCLUSIVE_EXT
;
118 if (ctx
->DrawBuffer
== ctx
->WinSysDrawBuffer
) {
122 for (i
= 0; i
< num_rects
; i
++) {
123 const struct gl_scissor_rect
*rect
= &scissor
->WindowRects
[i
];
124 new_rects
[i
].minx
= MAX2(rect
->X
, 0);
125 new_rects
[i
].miny
= MAX2(rect
->Y
, 0);
126 new_rects
[i
].maxx
= MAX2(rect
->X
+ rect
->Width
, 0);
127 new_rects
[i
].maxy
= MAX2(rect
->Y
+ rect
->Height
, 0);
129 if (num_rects
> 0 && memcmp(new_rects
, st
->state
.window_rects
.rects
,
130 num_rects
* sizeof(struct pipe_scissor_state
))) {
131 memcpy(st
->state
.window_rects
.rects
, new_rects
,
132 num_rects
* sizeof(struct pipe_scissor_state
));
135 if (st
->state
.window_rects
.num
!= num_rects
) {
136 st
->state
.window_rects
.num
= num_rects
;
139 if (st
->state
.window_rects
.include
!= include
) {
140 st
->state
.window_rects
.include
= include
;
144 st
->pipe
->set_window_rectangles(
145 st
->pipe
, include
, num_rects
, new_rects
);