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 "depth.h"
  29 #include "lines.h"
  30 #include "macros.h"
  31 #include "texstate.h"
  32 #include "mtypes.h"
  33
  34
  35 /**
  36  * Set the line width.
  37  *
  38  * \param width line width in pixels.
  39  *
  40  * \sa glLineWidth().
  41  */
  42 void GLAPIENTRY
  43 _mesa_LineWidth( GLfloat width )
  44 {
  45    GET_CURRENT_CONTEXT(ctx);
  46    ASSERT_OUTSIDE_BEGIN_END(ctx);
  47
  48    if (width<=0.0) {
  49       _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
  50       return;
  51    }
  52
  53    if (ctx->Line.Width == width)
  54       return;
  55
  56    FLUSH_VERTICES(ctx, _NEW_LINE);
  57    ctx->Line.Width = width;
  58
  59    if (width != 1.0F)
  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  * Set the line stipple pattern.
  71  *
  72  * \param factor pattern scale factor.
  73  * \param pattern bit pattern.
  74  *
  75  * \sa glLineStipple().
  76  *
  77  * Updates gl_line_attrib::StippleFactor and gl_line_attrib::StipplePattern. On
  78  * change flushes the vertices and notifies the driver via
  79  * the dd_function_table::LineStipple callback.
  80  */
  81 void GLAPIENTRY
  82 _mesa_LineStipple( GLint factor, GLushort pattern )
  83 {
  84    GET_CURRENT_CONTEXT(ctx);
  85    ASSERT_OUTSIDE_BEGIN_END(ctx);
  86
  87    factor = CLAMP( factor, 1, 256 );
  88
  89    if (ctx->Line.StippleFactor == factor &&
  90        ctx->Line.StipplePattern == pattern)
  91       return;
  92
  93    FLUSH_VERTICES(ctx, _NEW_LINE);
  94    ctx->Line.StippleFactor = factor;
  95    ctx->Line.StipplePattern = pattern;
  96
  97    if (ctx->Driver.LineStipple)
  98       ctx->Driver.LineStipple( ctx, factor, pattern );
  99 }
 100
 101
 102 /**
 103  * Initialize the context line state.
 104  *
 105  * \param ctx GL context.
 106  *
 107  * Initializes __GLcontextRec::Line and line related constants in
 108  * __GLcontextRec::Const.
 109  */
 110 void GLAPIENTRY
 111 _mesa_init_line( GLcontext * ctx )
 112 {
 113    ctx->Line.SmoothFlag = GL_FALSE;
 114    ctx->Line.StippleFlag = GL_FALSE;
 115    ctx->Line.Width = 1.0;
 116    ctx->Line.StipplePattern = 0xffff;
 117    ctx->Line.StippleFactor = 1;
 118 }