1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
5 *
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:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
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.
23 */
24
25
26 #include "glheader.h"
27 #include "context.h"
28 #include "lines.h"
29 #include "macros.h"
30 #include "mtypes.h"
31 #include "api_exec_decl.h"
32
33 #include "state_tracker/st_context.h"
34
35 /**
36 * Set the line width.
37 *
38 * \param width line width in pixels.
39 *
40 * \sa glLineWidth().
41 */
42 static ALWAYS_INLINE void
line_width(struct gl_context * ctx,GLfloat width,bool no_error)43 line_width(struct gl_context *ctx, GLfloat width, bool no_error)
44 {
45 /* If width is unchanged, there can't be an error */
46 if (ctx->Line.Width == width)
47 return;
48
49 if (!no_error && width <= 0.0F) {
50 _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
51 return;
52 }
53
54 /* Page 407 (page 423 of the PDF) of the OpenGL 3.0 spec says (in the list
55 * of deprecated functionality):
56 *
57 * "Wide lines and line stipple - LineWidth is not deprecated, but
58 * values greater than 1.0 will generate an INVALID_VALUE error;"
59 *
60 * This is one of the very few cases where functionality was deprecated but
61 * *NOT* removed in a later spec. Therefore, we only disallow this in a
62 * forward compatible context.
63 */
64 if (!no_error && ctx->API == API_OPENGL_CORE
65 && ((ctx->Const.ContextFlags & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT)
66 != 0)
67 && width > 1.0F) {
68 _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
69 return;
70 }
71
72 FLUSH_VERTICES(ctx, 0, GL_LINE_BIT);
73 ctx->NewDriverState |= ST_NEW_RASTERIZER;
74 ctx->Line.Width = width;
75 }
76
77
78 void GLAPIENTRY
_mesa_LineWidth_no_error(GLfloat width)79 _mesa_LineWidth_no_error(GLfloat width)
80 {
81 GET_CURRENT_CONTEXT(ctx);
82 line_width(ctx, width, true);
83 }
84
85
86 void GLAPIENTRY
_mesa_LineWidth(GLfloat width)87 _mesa_LineWidth(GLfloat width)
88 {
89 GET_CURRENT_CONTEXT(ctx);
90
91 if (MESA_VERBOSE & VERBOSE_API)
92 _mesa_debug(ctx, "glLineWidth %f\n", width);
93
94 line_width(ctx, width, false);
95 }
96
97
98 /**
99 * Set the line stipple pattern.
100 *
101 * \param factor pattern scale factor.
102 * \param pattern bit pattern.
103 *
104 * \sa glLineStipple().
105 *
106 * Updates gl_line_attrib::StippleFactor and gl_line_attrib::StipplePattern. On
107 * change flushes the vertices and notifies the driver via
108 * the dd_function_table::LineStipple callback.
109 */
110 void GLAPIENTRY
_mesa_LineStipple(GLint factor,GLushort pattern)111 _mesa_LineStipple( GLint factor, GLushort pattern )
112 {
113 GET_CURRENT_CONTEXT(ctx);
114
115 if (MESA_VERBOSE & VERBOSE_API)
116 _mesa_debug(ctx, "glLineStipple %d %u\n", factor, pattern);
117
118 factor = CLAMP( factor, 1, 256 );
119
120 if (ctx->Line.StippleFactor == factor &&
121 ctx->Line.StipplePattern == pattern)
122 return;
123
124 FLUSH_VERTICES(ctx, 0, GL_LINE_BIT);
125 ctx->NewDriverState |= ST_NEW_RASTERIZER;
126 ctx->Line.StippleFactor = factor;
127 ctx->Line.StipplePattern = pattern;
128 }
129
130
131 /**
132 * Initialize the context line state.
133 *
134 * \param ctx GL context.
135 *
136 * Initializes __struct gl_contextRec::Line and line related constants in
137 * __struct gl_contextRec::Const.
138 */
139 void
_mesa_init_line(struct gl_context * ctx)140 _mesa_init_line( struct gl_context * ctx )
141 {
142 ctx->Line.SmoothFlag = GL_FALSE;
143 ctx->Line.StippleFlag = GL_FALSE;
144 ctx->Line.Width = 1.0;
145 ctx->Line.StipplePattern = 0xffff;
146 ctx->Line.StippleFactor = 1;
147 }
148