src/mesa/main/lines.c

   1 /* $Id: lines.c,v 1.28 2001/03/03 20:33:27 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2000  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 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "context.h"
  33 #include "depth.h"
  34 #include "lines.h"
  35 #include "macros.h"
  36 #include "mmath.h"
  37 #include "texstate.h"
  38 #include "mtypes.h"
  39 #endif
  40
  41
  42
  43 void
  44 _mesa_LineWidth( GLfloat width )
  45 {
  46    GET_CURRENT_CONTEXT(ctx);
  47    ASSERT_OUTSIDE_BEGIN_END(ctx);
  48
  49    if (width<=0.0) {
  50       _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
  51       return;
  52    }
  53
  54    if (ctx->Line.Width == width)
  55       return;
  56
  57    FLUSH_VERTICES(ctx, _NEW_LINE);
  58    ctx->Line.Width = width;
  59    ctx->Line._Width = CLAMP(width,
  60                             ctx->Const.MinLineWidth,
  61                             ctx->Const.MaxLineWidth);
  62
  63
  64    if (width != 1.0)
  65       ctx->_TriangleCaps |= DD_LINE_WIDTH;
  66    else
  67       ctx->_TriangleCaps &= ~DD_LINE_WIDTH;
  68
  69    if (ctx->Driver.LineWidth)
  70       (*ctx->Driver.LineWidth)(ctx, width);
  71 }
  72
  73
  74
  75 void
  76 _mesa_LineStipple( GLint factor, GLushort pattern )
  77 {
  78    GET_CURRENT_CONTEXT(ctx);
  79    ASSERT_OUTSIDE_BEGIN_END(ctx);
  80
  81    factor = CLAMP( factor, 1, 256 );
  82
  83    if (ctx->Line.StippleFactor == factor &&
  84        ctx->Line.StipplePattern == pattern)
  85       return;
  86
  87    FLUSH_VERTICES(ctx, _NEW_LINE);
  88    ctx->Line.StippleFactor = factor;
  89    ctx->Line.StipplePattern = pattern;
  90
  91    if (ctx->Driver.LineStipple)
  92       ctx->Driver.LineStipple( ctx, factor, pattern );
  93 }
  94
  95