TextNodeGLCompat.cc 5.98 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
/*===========================================================================*\
 *                                                                           *
 *                              OpenFlipper                                  *
 *           Copyright (c) 2001-2015, RWTH-Aachen University                 *
 *           Department of Computer Graphics and Multimedia                  *
 *                          All rights reserved.                             *
 *                            www.openflipper.org                            *
 *                                                                           *
 *---------------------------------------------------------------------------*
 * This file is part of OpenFlipper.                                         *
 *---------------------------------------------------------------------------*
 *                                                                           *
 * Redistribution and use in source and binary forms, with or without        *
 * modification, are permitted provided that the following conditions        *
 * are met:                                                                  *
 *                                                                           *
 * 1. Redistributions of source code must retain the above copyright notice, *
 *    this list of conditions and the following disclaimer.                  *
 *                                                                           *
 * 2. Redistributions in binary form must reproduce the above copyright      *
 *    notice, this list of conditions and the following disclaimer in the    *
 *    documentation and/or other materials provided with the distribution.   *
 *                                                                           *
 * 3. Neither the name of the copyright holder nor the names of its          *
 *    contributors may be used to endorse or promote products derived from   *
 *    this software without specific prior written permission.               *
 *                                                                           *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A           *
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,  *
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,       *
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR        *
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    *
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING      *
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        *
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              *
 *                                                                           *
\*===========================================================================*/

/*===========================================================================*\
 *                                                                           *
 *   $Revision$                                                       *
 *   $Author$                                                      *
 *   $Date$                   *
 *                                                                           *
\*===========================================================================*/




//=============================================================================
//
//  CLASS TextNode - IMPLEMENTATION
//
//=============================================================================



//== INCLUDES =================================================================

#include <ACG/GL/acg_glew.hh>

#include "TextNode.hh"
#include "../Utils/ImageConversion.hh"


//== NAMESPACES ===============================================================

namespace ACG {
namespace SceneGraph {


//== IMPLEMENTATION ==========================================================

void
TextNode::
enterCompat(GLState& _state, const DrawModes::DrawMode& /*_drawmode*/) {
  if (text_.empty())
    return;

  // store current gl state
  cullFaceEnabled_ = glIsEnabled(GL_CULL_FACE);
  texture2dEnabled_ = glIsEnabled(GL_TEXTURE_2D);
  blendEnabled_ = glIsEnabled(GL_BLEND);
  depthEnabled_ = glIsEnabled(GL_DEPTH_TEST);
  //alphaTest_ = glIsEnabled(GL_ALPHA_TEST);
  if (alphaTest_)
    ACG::GLState::getAlphaFunc(&alphaTestFunc_, &alphaTestValue_);

  glGetIntegerv(GL_BLEND_SRC, &blendSrc_);
  glGetIntegerv(GL_BLEND_DST, &blendDest_);

  // set texture and drawing states
  ACG::GLState::disable(GL_CULL_FACE);
  ACG::GLState::enable(GL_TEXTURE_2D);
  ACG::GLState::enable(GL_BLEND);
  ACG::GLState::enable(GL_ALPHA_TEST);
  ACG::GLState::alphaFunc(GL_GREATER, 0.2f);
  ACG::GLState::blendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  if (alwaysOnTop_)
    ACG::GLState::disable(GL_DEPTH_TEST);
}



//----------------------------------------------------------------------------


void
TextNode::
leaveCompat(GLState& /*_state*/, const DrawModes::DrawMode& /*_drawmode*/) {
  if (text_.empty())
      return;

  // restore the GLState as it was when entering TextNode
  if (cullFaceEnabled_)
    ACG::GLState::enable(GL_CULL_FACE);
  if (!texture2dEnabled_)
    ACG::GLState::disable(GL_TEXTURE_2D);
  if (!blendEnabled_)
    ACG::GLState::disable(GL_BLEND);
  if (depthEnabled_)
    ACG::GLState::enable(GL_DEPTH_TEST);
  else
    ACG::GLState::disable(GL_DEPTH_TEST);
  if (!alphaTest_)
    ACG::GLState::disable(GL_ALPHA_TEST);
  else
    ACG::GLState::alphaFunc(alphaTestFunc_, alphaTestValue_);

  ACG::GLState::blendFunc(blendSrc_, blendDest_);
}

//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================