lines.c revision f9995b30756140724f41daf963fa06167912be7f 
1/*
2 * Mesa 3-D graphics library
3 * Version:  6.5.3
4 *
5 * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
6 *
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:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
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.
23 */
24
25
26#include "glheader.h"
27#include "context.h"
28#include "lines.h"
29#include "macros.h"
30#include "mtypes.h"
31
32
33/**
34 * Set the line width.
35 *
36 * \param width line width in pixels.
37 *
38 * \sa glLineWidth().
39 */
40void GLAPIENTRY
41_mesa_LineWidth( GLfloat width )
42{
43   GET_CURRENT_CONTEXT(ctx);
44   ASSERT_OUTSIDE_BEGIN_END(ctx);
45
46   if (width<=0.0) {
47      _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
48      return;
49   }
50
51   if (ctx->Line.Width == width)
52      return;
53
54   FLUSH_VERTICES(ctx, _NEW_LINE);
55   ctx->Line.Width = width;
56
57   if (width != 1.0F)
58      ctx->_TriangleCaps |= DD_LINE_WIDTH;
59   else
60      ctx->_TriangleCaps &= ~DD_LINE_WIDTH;
61
62   if (ctx->Driver.LineWidth)
63      ctx->Driver.LineWidth(ctx, width);
64}
65
66
67/**
68 * Set the line stipple pattern.
69 *
70 * \param factor pattern scale factor.
71 * \param pattern bit pattern.
72 *
73 * \sa glLineStipple().
74 *
75 * Updates gl_line_attrib::StippleFactor and gl_line_attrib::StipplePattern. On
76 * change flushes the vertices and notifies the driver via
77 * the dd_function_table::LineStipple callback.
78 */
79void GLAPIENTRY
80_mesa_LineStipple( GLint factor, GLushort pattern )
81{
82   GET_CURRENT_CONTEXT(ctx);
83   ASSERT_OUTSIDE_BEGIN_END(ctx);
84
85   factor = CLAMP( factor, 1, 256 );
86
87   if (ctx->Line.StippleFactor == factor &&
88       ctx->Line.StipplePattern == pattern)
89      return;
90
91   FLUSH_VERTICES(ctx, _NEW_LINE);
92   ctx->Line.StippleFactor = factor;
93   ctx->Line.StipplePattern = pattern;
94
95   if (ctx->Driver.LineStipple)
96      ctx->Driver.LineStipple( ctx, factor, pattern );
97}
98
99
100/**
101 * Initialize the context line state.
102 *
103 * \param ctx GL context.
104 *
105 * Initializes __struct gl_contextRec::Line and line related constants in
106 * __struct gl_contextRec::Const.
107 */
108void GLAPIENTRY
109_mesa_init_line( struct gl_context * ctx )
110{
111   ctx->Line.SmoothFlag = GL_FALSE;
112   ctx->Line.StippleFlag = GL_FALSE;
113   ctx->Line.Width = 1.0;
114   ctx->Line.StipplePattern = 0xffff;
115   ctx->Line.StippleFactor = 1;
116}
117