src/mesa/main/lines.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  5.1
   5  *
   6  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 #include "glheader.h"
  28 #include "context.h"
  29 #include "depth.h"
  30 #include "lines.h"
  31 #include "macros.h"
  32 #include "texstate.h"
  33 #include "mtypes.h"
  34
  35
  36 void
  37 _mesa_LineWidth( GLfloat width )
  38 {
  39    GET_CURRENT_CONTEXT(ctx);
  40    ASSERT_OUTSIDE_BEGIN_END(ctx);
  41
  42    if (width<=0.0) {
  43       _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
  44       return;
  45    }
  46
  47    if (ctx->Line.Width == width)
  48       return;
  49
  50    FLUSH_VERTICES(ctx, _NEW_LINE);
  51    ctx->Line.Width = width;
  52    ctx->Line._Width = CLAMP(width,
  53                             ctx->Const.MinLineWidth,
  54                             ctx->Const.MaxLineWidth);
  55
  56
  57    if (width != 1.0)
  58       ctx->_TriangleCaps |= DD_LINE_WIDTH;
  59    else
  60       ctx->_TriangleCaps &= ~DD_LINE_WIDTH;
  61
  62    if (ctx->Driver.LineWidth)
  63       (*ctx->Driver.LineWidth)(ctx, width);
  64 }
  65
  66
  67
  68 void
  69 _mesa_LineStipple( GLint factor, GLushort pattern )
  70 {
  71    GET_CURRENT_CONTEXT(ctx);
  72    ASSERT_OUTSIDE_BEGIN_END(ctx);
  73
  74    factor = CLAMP( factor, 1, 256 );
  75
  76    if (ctx->Line.StippleFactor == factor &&
  77        ctx->Line.StipplePattern == pattern)
  78       return;
  79
  80    FLUSH_VERTICES(ctx, _NEW_LINE);
  81    ctx->Line.StippleFactor = factor;
  82    ctx->Line.StipplePattern = pattern;
  83
  84    if (ctx->Driver.LineStipple)
  85       ctx->Driver.LineStipple( ctx, factor, pattern );
  86 }