src/mesa/main/lines.c

   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  */
  40 void 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 (ctx->Driver.LineWidth)
  58       ctx->Driver.LineWidth(ctx, width);
  59 }
  60
  61
  62 /**
  63  * Set the line stipple pattern.
  64  *
  65  * \param factor pattern scale factor.
  66  * \param pattern bit pattern.
  67  *
  68  * \sa glLineStipple().
  69  *
  70  * Updates gl_line_attrib::StippleFactor and gl_line_attrib::StipplePattern. On
  71  * change flushes the vertices and notifies the driver via
  72  * the dd_function_table::LineStipple callback.
  73  */
  74 void GLAPIENTRY
  75 _mesa_LineStipple( GLint factor, GLushort pattern )
  76 {
  77    GET_CURRENT_CONTEXT(ctx);
  78    ASSERT_OUTSIDE_BEGIN_END(ctx);
  79
  80    factor = CLAMP( factor, 1, 256 );
  81
  82    if (ctx->Line.StippleFactor == factor &&
  83        ctx->Line.StipplePattern == pattern)
  84       return;
  85
  86    FLUSH_VERTICES(ctx, _NEW_LINE);
  87    ctx->Line.StippleFactor = factor;
  88    ctx->Line.StipplePattern = pattern;
  89
  90    if (ctx->Driver.LineStipple)
  91       ctx->Driver.LineStipple( ctx, factor, pattern );
  92 }
  93
  94
  95 /**
  96  * Initialize the context line state.
  97  *
  98  * \param ctx GL context.
  99  *
 100  * Initializes __struct gl_contextRec::Line and line related constants in
 101  * __struct gl_contextRec::Const.
 102  */
 103 void GLAPIENTRY
 104 _mesa_init_line( struct gl_context * ctx )
 105 {
 106    ctx->Line.SmoothFlag = GL_FALSE;
 107    ctx->Line.StippleFlag = GL_FALSE;
 108    ctx->Line.Width = 1.0;
 109    ctx->Line.StipplePattern = 0xffff;
 110    ctx->Line.StippleFactor = 1;
 111 }