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 (width != 1.0F)
  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  * Set the line stipple pattern.
  69  *
  70  * \param factor pattern scale factor.
  71  * \param pattern bit pattern.
  72  *
  73  * \sa glLineStipple().
  74  *
  75  * Updates gl_line_attrib::StippleFactor and gl_line_attrib::StipplePattern. On
  76  * change flushes the vertices and notifies the driver via
  77  * the dd_function_table::LineStipple callback.
  78  */
  79 void GLAPIENTRY
  80 _mesa_LineStipple( GLint factor, GLushort pattern )
  81 {
  82    GET_CURRENT_CONTEXT(ctx);
  83    ASSERT_OUTSIDE_BEGIN_END(ctx);
  84
  85    factor = CLAMP( factor, 1, 256 );
  86
  87    if (ctx->Line.StippleFactor == factor &&
  88        ctx->Line.StipplePattern == pattern)
  89       return;
  90
  91    FLUSH_VERTICES(ctx, _NEW_LINE);
  92    ctx->Line.StippleFactor = factor;
  93    ctx->Line.StipplePattern = pattern;
  94
  95    if (ctx->Driver.LineStipple)
  96       ctx->Driver.LineStipple( ctx, factor, pattern );
  97 }
  98
  99
 100 /**
 101  * Initialize the context line state.
 102  *
 103  * \param ctx GL context.
 104  *
 105  * Initializes __struct gl_contextRec::Line and line related constants in
 106  * __struct gl_contextRec::Const.
 107  */
 108 void GLAPIENTRY
 109 _mesa_init_line( struct gl_context * ctx )
 110 {
 111    ctx->Line.SmoothFlag = GL_FALSE;
 112    ctx->Line.StippleFlag = GL_FALSE;
 113    ctx->Line.Width = 1.0;
 114    ctx->Line.StipplePattern = 0xffff;
 115    ctx->Line.StippleFactor = 1;
 116 }