2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
36 * \param width line width in pixels.
40 static ALWAYS_INLINE
void
41 line_width(struct gl_context
*ctx
, GLfloat width
, bool no_error
)
43 /* If width is unchanged, there can't be an error */
44 if (ctx
->Line
.Width
== width
)
47 if (!no_error
&& width
<= 0.0F
) {
48 _mesa_error( ctx
, GL_INVALID_VALUE
, "glLineWidth" );
52 /* Page 407 (page 423 of the PDF) of the OpenGL 3.0 spec says (in the list
53 * of deprecated functionality):
55 * "Wide lines and line stipple - LineWidth is not deprecated, but
56 * values greater than 1.0 will generate an INVALID_VALUE error;"
58 * This is one of the very few cases where functionality was deprecated but
59 * *NOT* removed in a later spec. Therefore, we only disallow this in a
60 * forward compatible context.
62 if (!no_error
&& ctx
->API
== API_OPENGL_CORE
63 && ((ctx
->Const
.ContextFlags
& GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT
)
66 _mesa_error( ctx
, GL_INVALID_VALUE
, "glLineWidth" );
70 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewLineState
? 0 : _NEW_LINE
);
71 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewLineState
;
72 ctx
->Line
.Width
= width
;
74 if (ctx
->Driver
.LineWidth
)
75 ctx
->Driver
.LineWidth(ctx
, width
);
80 _mesa_LineWidth_no_error(GLfloat width
)
82 GET_CURRENT_CONTEXT(ctx
);
83 line_width(ctx
, width
, true);
88 _mesa_LineWidth(GLfloat width
)
90 GET_CURRENT_CONTEXT(ctx
);
92 if (MESA_VERBOSE
& VERBOSE_API
)
93 _mesa_debug(ctx
, "glLineWidth %f\n", width
);
95 line_width(ctx
, width
, false);
100 * Set the line stipple pattern.
102 * \param factor pattern scale factor.
103 * \param pattern bit pattern.
105 * \sa glLineStipple().
107 * Updates gl_line_attrib::StippleFactor and gl_line_attrib::StipplePattern. On
108 * change flushes the vertices and notifies the driver via
109 * the dd_function_table::LineStipple callback.
112 _mesa_LineStipple( GLint factor
, GLushort pattern
)
114 GET_CURRENT_CONTEXT(ctx
);
116 if (MESA_VERBOSE
& VERBOSE_API
)
117 _mesa_debug(ctx
, "glLineStipple %d %u\n", factor
, pattern
);
119 factor
= CLAMP( factor
, 1, 256 );
121 if (ctx
->Line
.StippleFactor
== factor
&&
122 ctx
->Line
.StipplePattern
== pattern
)
125 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewLineState
? 0 : _NEW_LINE
);
126 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewLineState
;
127 ctx
->Line
.StippleFactor
= factor
;
128 ctx
->Line
.StipplePattern
= pattern
;
130 if (ctx
->Driver
.LineStipple
)
131 ctx
->Driver
.LineStipple( ctx
, factor
, pattern
);
136 * Initialize the context line state.
138 * \param ctx GL context.
140 * Initializes __struct gl_contextRec::Line and line related constants in
141 * __struct gl_contextRec::Const.
144 _mesa_init_line( struct gl_context
* ctx
)
146 ctx
->Line
.SmoothFlag
= GL_FALSE
;
147 ctx
->Line
.StippleFlag
= GL_FALSE
;
148 ctx
->Line
.Width
= 1.0;
149 ctx
->Line
.StipplePattern
= 0xffff;
150 ctx
->Line
.StippleFactor
= 1;