src/mesa/main/lines.c

   1 /* $Id: lines.c,v 1.30 2002/10/24 23:57:21 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #include "glheader.h"
  29 #include "context.h"
  30 #include "depth.h"
  31 #include "lines.h"
  32 #include "macros.h"
  33 #include "mmath.h"
  34 #include "texstate.h"
  35 #include "mtypes.h"
  36
  37
  38 void
  39 _mesa_LineWidth( GLfloat width )
  40 {
  41    GET_CURRENT_CONTEXT(ctx);
  42    ASSERT_OUTSIDE_BEGIN_END(ctx);
  43
  44    if (width<=0.0) {
  45       _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
  46       return;
  47    }
  48
  49    if (ctx->Line.Width == width)
  50       return;
  51
  52    FLUSH_VERTICES(ctx, _NEW_LINE);
  53    ctx->Line.Width = width;
  54    ctx->Line._Width = CLAMP(width,
  55                             ctx->Const.MinLineWidth,
  56                             ctx->Const.MaxLineWidth);
  57
  58
  59    if (width != 1.0)
  60       ctx->_TriangleCaps |= DD_LINE_WIDTH;
  61    else
  62       ctx->_TriangleCaps &= ~DD_LINE_WIDTH;
  63
  64    if (ctx->Driver.LineWidth)
  65       (*ctx->Driver.LineWidth)(ctx, width);
  66 }
  67
  68
  69
  70 void
  71 _mesa_LineStipple( GLint factor, GLushort pattern )
  72 {
  73    GET_CURRENT_CONTEXT(ctx);
  74    ASSERT_OUTSIDE_BEGIN_END(ctx);
  75
  76    factor = CLAMP( factor, 1, 256 );
  77
  78    if (ctx->Line.StippleFactor == factor &&
  79        ctx->Line.StipplePattern == pattern)
  80       return;
  81
  82    FLUSH_VERTICES(ctx, _NEW_LINE);
  83    ctx->Line.StippleFactor = factor;
  84    ctx->Line.StipplePattern = pattern;
  85
  86    if (ctx->Driver.LineStipple)
  87       ctx->Driver.LineStipple( ctx, factor, pattern );
  88 }