2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 #include "main/glheader.h"
27 #include "main/context.h"
28 #include "main/scissor.h"
32 * Called via glScissor
35 _mesa_Scissor( GLint x
, GLint y
, GLsizei width
, GLsizei height
)
37 GET_CURRENT_CONTEXT(ctx
);
38 ASSERT_OUTSIDE_BEGIN_END(ctx
);
40 if (width
< 0 || height
< 0) {
41 _mesa_error( ctx
, GL_INVALID_VALUE
, "glScissor" );
45 if (MESA_VERBOSE
& VERBOSE_API
)
46 _mesa_debug(ctx
, "glScissor %d %d %d %d\n", x
, y
, width
, height
);
48 _mesa_set_scissor(ctx
, x
, y
, width
, height
);
53 * Define the scissor box.
55 * \param x, y coordinates of the scissor box lower-left corner.
56 * \param width width of the scissor box.
57 * \param height height of the scissor box.
61 * Verifies the parameters and updates __GLcontextRec::Scissor. On a
62 * change flushes the vertices and notifies the driver via
63 * the dd_function_table::Scissor callback.
66 _mesa_set_scissor(GLcontext
*ctx
,
67 GLint x
, GLint y
, GLsizei width
, GLsizei height
)
69 if (x
== ctx
->Scissor
.X
&&
70 y
== ctx
->Scissor
.Y
&&
71 width
== ctx
->Scissor
.Width
&&
72 height
== ctx
->Scissor
.Height
)
75 FLUSH_VERTICES(ctx
, _NEW_SCISSOR
);
78 ctx
->Scissor
.Width
= width
;
79 ctx
->Scissor
.Height
= height
;
81 if (ctx
->Driver
.Scissor
)
82 ctx
->Driver
.Scissor( ctx
, x
, y
, width
, height
);
87 * Initialize the context's scissor state.
88 * \param ctx the GL context.
91 _mesa_init_scissor(GLcontext
*ctx
)
94 ctx
->Scissor
.Enabled
= GL_FALSE
;
97 ctx
->Scissor
.Width
= 0;
98 ctx
->Scissor
.Height
= 0;