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.
41 _mesa_LineWidth( GLfloat width
)
43 GET_CURRENT_CONTEXT(ctx
);
45 if (MESA_VERBOSE
& VERBOSE_API
)
46 _mesa_debug(ctx
, "glLineWidth %f\n", width
);
48 /* If width is unchanged, there can't be an error */
49 if (ctx
->Line
.Width
== width
)
53 _mesa_error( ctx
, GL_INVALID_VALUE
, "glLineWidth" );
57 /* Page 407 (page 423 of the PDF) of the OpenGL 3.0 spec says (in the list
58 * of deprecated functionality):
60 * "Wide lines and line stipple - LineWidth is not deprecated, but
61 * values greater than 1.0 will generate an INVALID_VALUE error;"
63 * This is one of the very few cases where functionality was deprecated but
64 * *NOT* removed in a later spec. Therefore, we only disallow this in a
65 * forward compatible context.
67 if (ctx
->API
== API_OPENGL_CORE
68 && ((ctx
->Const
.ContextFlags
& GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT
)
71 _mesa_error( ctx
, GL_INVALID_VALUE
, "glLineWidth" );
75 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewLineState
? 0 : _NEW_LINE
);
76 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewLineState
;
77 ctx
->Line
.Width
= width
;
79 if (ctx
->Driver
.LineWidth
)
80 ctx
->Driver
.LineWidth(ctx
, width
);
85 * Set the line stipple pattern.
87 * \param factor pattern scale factor.
88 * \param pattern bit pattern.
90 * \sa glLineStipple().
92 * Updates gl_line_attrib::StippleFactor and gl_line_attrib::StipplePattern. On
93 * change flushes the vertices and notifies the driver via
94 * the dd_function_table::LineStipple callback.
97 _mesa_LineStipple( GLint factor
, GLushort pattern
)
99 GET_CURRENT_CONTEXT(ctx
);
101 if (MESA_VERBOSE
& VERBOSE_API
)
102 _mesa_debug(ctx
, "glLineStipple %d %u\n", factor
, pattern
);
104 factor
= CLAMP( factor
, 1, 256 );
106 if (ctx
->Line
.StippleFactor
== factor
&&
107 ctx
->Line
.StipplePattern
== pattern
)
110 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewLineState
? 0 : _NEW_LINE
);
111 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewLineState
;
112 ctx
->Line
.StippleFactor
= factor
;
113 ctx
->Line
.StipplePattern
= pattern
;
115 if (ctx
->Driver
.LineStipple
)
116 ctx
->Driver
.LineStipple( ctx
, factor
, pattern
);
121 * Initialize the context line state.
123 * \param ctx GL context.
125 * Initializes __struct gl_contextRec::Line and line related constants in
126 * __struct gl_contextRec::Const.
129 _mesa_init_line( struct gl_context
* ctx
)
131 ctx
->Line
.SmoothFlag
= GL_FALSE
;
132 ctx
->Line
.StippleFlag
= GL_FALSE
;
133 ctx
->Line
.Width
= 1.0;
134 ctx
->Line
.StipplePattern
= 0xffff;
135 ctx
->Line
.StippleFactor
= 1;