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  1. /*
  2.  * Mesa 3-D graphics library
  3.  *
  4.  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the "Software"),
  8.  * to deal in the Software without restriction, including without limitation
  9.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10.  * and/or sell copies of the Software, and to permit persons to whom the
  11.  * Software is furnished to do so, subject to the following conditions:
  12.  *
  13.  * The above copyright notice and this permission notice shall be included
  14.  * in all copies or substantial portions of the Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22.  * 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.  
  45.    if (MESA_VERBOSE & VERBOSE_API)
  46.       _mesa_debug(ctx, "glLineWidth %f\n", width);
  47.  
  48.    if (width<=0.0) {
  49.       _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
  50.       return;
  51.    }
  52.  
  53.    /* Page 407 (page 423 of the PDF) of the OpenGL 3.0 spec says (in the list
  54.     * of deprecated functionality):
  55.     *
  56.     *     "Wide lines and line stipple - LineWidth is not deprecated, but
  57.     *     values greater than 1.0 will generate an INVALID_VALUE error;"
  58.     *
  59.     * This is one of the very few cases where functionality was deprecated but
  60.     * *NOT* removed in a later spec.  Therefore, we only disallow this in a
  61.     * forward compatible context.
  62.     */
  63.    if (ctx->API == API_OPENGL_CORE
  64.        && ((ctx->Const.ContextFlags & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT)
  65.            != 0)) {
  66.       _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
  67.       return;
  68.    }
  69.  
  70.    if (ctx->Line.Width == width)
  71.       return;
  72.  
  73.    FLUSH_VERTICES(ctx, _NEW_LINE);
  74.    ctx->Line.Width = width;
  75.  
  76.    if (ctx->Driver.LineWidth)
  77.       ctx->Driver.LineWidth(ctx, width);
  78. }
  79.  
  80.  
  81. /**
  82.  * Set the line stipple pattern.
  83.  *
  84.  * \param factor pattern scale factor.
  85.  * \param pattern bit pattern.
  86.  *
  87.  * \sa glLineStipple().
  88.  *
  89.  * Updates gl_line_attrib::StippleFactor and gl_line_attrib::StipplePattern. On
  90.  * change flushes the vertices and notifies the driver via
  91.  * the dd_function_table::LineStipple callback.
  92.  */
  93. void GLAPIENTRY
  94. _mesa_LineStipple( GLint factor, GLushort pattern )
  95. {
  96.    GET_CURRENT_CONTEXT(ctx);
  97.  
  98.    if (MESA_VERBOSE & VERBOSE_API)
  99.       _mesa_debug(ctx, "glLineStipple %d %u\n", factor, pattern);
  100.  
  101.    factor = CLAMP( factor, 1, 256 );
  102.  
  103.    if (ctx->Line.StippleFactor == factor &&
  104.        ctx->Line.StipplePattern == pattern)
  105.       return;
  106.  
  107.    FLUSH_VERTICES(ctx, _NEW_LINE);
  108.    ctx->Line.StippleFactor = factor;
  109.    ctx->Line.StipplePattern = pattern;
  110.  
  111.    if (ctx->Driver.LineStipple)
  112.       ctx->Driver.LineStipple( ctx, factor, pattern );
  113. }
  114.  
  115.  
  116. /**
  117.  * Initialize the context line state.
  118.  *
  119.  * \param ctx GL context.
  120.  *
  121.  * Initializes __struct gl_contextRec::Line and line related constants in
  122.  * __struct gl_contextRec::Const.
  123.  */
  124. void GLAPIENTRY
  125. _mesa_init_line( struct gl_context * ctx )
  126. {
  127.    ctx->Line.SmoothFlag = GL_FALSE;
  128.    ctx->Line.StippleFlag = GL_FALSE;
  129.    ctx->Line.Width = 1.0;
  130.    ctx->Line.StipplePattern = 0xffff;
  131.    ctx->Line.StippleFactor = 1;
  132. }
  133.