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maint: Merge stable to default.
author Markus Mützel <markus.muetzel@gmx.de>
date Tue, 28 May 2024 15:25:54 +0200
parents 689d4d069bbf
children
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2011-2024 The Octave Project Developers
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4 //
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5 // See the file COPYRIGHT.md in the top-level directory of this
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 #if defined (HAVE_CONFIG_H)
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27 # include "config.h"
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28 #endif
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29
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30 #include "gl-select.h"
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31
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32 OCTAVE_BEGIN_NAMESPACE(octave)
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33
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34 void
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35 opengl_selector::apply_pick_matrix ()
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36 {
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37 GLdouble p_matrix[16];
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38
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39 m_glfcns.glGetDoublev (GL_PROJECTION_MATRIX, p_matrix);
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40 m_glfcns.glMatrixMode (GL_PROJECTION);
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41 m_glfcns.glLoadIdentity ();
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42
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43 // The following block is equivalent to gluPickMatrix, but we avoid
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44 // using glu functions so that we can call OpenGL functions through
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45 // the QOpenGLFunctions class so that the OpenGL implementation may
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46 // be selected dynamically.
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47
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48 Matrix viewport = get_viewport_scaled ();
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49
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50 if (m_size > 0)
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51 {
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52 m_glfcns.glTranslatef ((viewport(2) - 2 * (m_xp - viewport(0))) / m_size,
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53 (viewport(3) - 2 * (m_yp - viewport(1))) / m_size, 0);
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54
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55 m_glfcns.glScalef (viewport(2) / m_size, viewport(3) / m_size, 1.0);
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56 }
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57
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58 m_glfcns.glMultMatrixd (p_matrix);
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59 m_glfcns.glMatrixMode (GL_MODELVIEW);
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60 }
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61
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62 void
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63 opengl_selector::setup_opengl_transformation (const axes::properties& props)
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64 {
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65 opengl_renderer::setup_opengl_transformation (props);
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66 apply_pick_matrix ();
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67 }
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68
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69 void
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70 opengl_selector::init_marker (const std::string& m, double sz, float width)
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71 {
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72 opengl_renderer::init_marker (m, sz, width);
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73 apply_pick_matrix ();
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74 }
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75
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76 # define BUFFER_SIZE 128
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77
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78 graphics_object
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79 opengl_selector::select (const graphics_object& ax, int x, int y, int flags)
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80 {
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81 m_glfcns.glEnable (GL_DEPTH_TEST);
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82 m_glfcns.glDepthFunc (GL_LEQUAL);
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83
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84 m_xp = x;
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85 m_yp = y;
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86
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87 GLuint select_buffer[BUFFER_SIZE];
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88
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89 m_glfcns.glSelectBuffer (BUFFER_SIZE, select_buffer);
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90 m_glfcns.glRenderMode (GL_SELECT);
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91 m_glfcns.glInitNames ();
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92
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93 m_object_map.clear ();
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94
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95 draw (ax);
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96
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97 int hits = m_glfcns.glRenderMode (GL_RENDER);
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98 graphics_object obj;
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99
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100 if (hits > 0)
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101 {
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102 GLuint current_minZ = 0xffffffff;
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103 GLuint current_name = 0xffffffff;
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104
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105 for (int i = 0, j = 0; i < hits && j < BUFFER_SIZE-3; i++)
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106 {
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107 GLuint n = select_buffer[j++],
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108 minZ = select_buffer[j++];
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109
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110 j++; // skip maxZ
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111 if (((flags & select_last) == 0 && (minZ <= current_minZ))
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112 || ((flags & select_last) != 0 && (minZ >= current_minZ)))
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113 {
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114 bool candidate = true;
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115 GLuint name =
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116 select_buffer[std::min (j + n, GLuint (BUFFER_SIZE)) - 1];
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117
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118 if ((flags & select_ignore_hittest) == 0)
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119 {
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120 graphics_object go = m_object_map[name];
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121
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122 if (! go.get_properties ().is_hittest ())
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123 candidate = false;
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124 }
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125
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126 if (candidate)
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127 {
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128 current_minZ = minZ;
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129 current_name = name;
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130 }
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131
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132 j += n;
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133 }
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134 else
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135 j += n;
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136 }
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137
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138 if (current_name != 0xffffffff)
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139 obj = m_object_map[current_name];
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140 }
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141 else if (hits < 0)
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142 warning ("opengl_selector::select: selection buffer overflow");
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143
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144 m_object_map.clear ();
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145
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146 return obj;
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147 }
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148
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149 void
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150 opengl_selector::draw (const graphics_object& go, bool toplevel)
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151 {
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152 GLuint name = m_object_map.size ();
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153
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154 m_object_map[name] = go;
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155 m_glfcns.glPushName (name);
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156 set_selecting (true);
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157 opengl_renderer::draw (go, toplevel);
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158 set_selecting (false);
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159 m_glfcns.glPopName ();
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160 }
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161
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162 void
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163 opengl_selector::fake_text (double x, double y, double z, const Matrix& bbox,
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164 bool use_scale)
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165 {
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166 ColumnVector xpos, xp1, xp2;
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167
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168 xpos = get_transform ().transform (x, y, z, use_scale);
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169
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170 xp1 = xp2 = xpos;
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171 xp1(0) += bbox(0);
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172 xp1(1) -= bbox(1);
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173 xp2(0) += (bbox(0) + bbox(2));
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174 xp2(1) -= (bbox(1) + bbox(3));
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175
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176 ColumnVector p1, p2, p3, p4;
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177
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178 p1 = get_transform ().untransform (xp1(0), xp1(1), xp1(2), false);
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179 p2 = get_transform ().untransform (xp2(0), xp1(1), xp1(2), false);
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180 p3 = get_transform ().untransform (xp2(0), xp2(1), xp1(2), false);
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181 p4 = get_transform ().untransform (xp1(0), xp2(1), xp1(2), false);
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182
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183 m_glfcns.glBegin (GL_QUADS);
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184 m_glfcns.glVertex3dv (p1.data ());
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185 m_glfcns.glVertex3dv (p2.data ());
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186 m_glfcns.glVertex3dv (p3.data ());
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187 m_glfcns.glVertex3dv (p4.data ());
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188 m_glfcns.glEnd ();
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189 }
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190
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191 void
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192 opengl_selector::draw_text (const text::properties& props)
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193 {
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194 if (props.get_string ().isempty ())
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195 return;
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196
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197 Matrix pos = props.get_data_position ();
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198 const Matrix bbox = props.get_extent_matrix ();
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199
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200 fake_text (pos(0), pos(1), pos.numel () > 2 ? pos(2) : 0.0, bbox);
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201 }
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202
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203 Matrix
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204 opengl_selector::render_text (const std::string& txt,
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205 double x, double y, double z,
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206 int halign, int valign, double rotation)
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207 {
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208 uint8NDArray pixels;
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209 Matrix bbox (1, 4, 0.0);
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210
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211 // FIXME: probably more efficient to only compute bbox instead
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212 // of doing full text rendering...
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213 text_to_pixels (txt, pixels, bbox, halign, valign, rotation);
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214 fake_text (x, y, z, bbox, false);
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215
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216 return bbox;
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217 }
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218
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219 void
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220 opengl_selector::draw_image (const image::properties& props)
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221 {
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222 Matrix xd = props.get_xdata ().matrix_value ();
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223 octave_idx_type nc = props.get_cdata ().columns ();
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224 double x_pix_size = (nc == 1 ? 1 : (xd(1) - xd(0)) / (nc - 1));
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225
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226 Matrix yd = props.get_ydata ().matrix_value ();
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227 octave_idx_type nr = props.get_cdata ().rows ();
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228 double y_pix_size = (nr == 1 ? 1 : (yd(1) - yd(0)) / (nr - 1));
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229
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230 ColumnVector p1 (3, 0.0), p2 (3, 0.0), p3 (3, 0.0), p4 (3, 0.0);
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231 p1(0) = xd(0) - x_pix_size/2;
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232 p1(1) = yd(0) - y_pix_size/2;
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233
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234 p2(0) = xd(1) + x_pix_size/2;
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235 p2(1) = yd(0) - y_pix_size/2;
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236
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237 p3(0) = xd(1) + x_pix_size/2;
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238 p3(1) = yd(1) + y_pix_size/2;
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239
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240 p4(0) = xd(0) - x_pix_size/2;
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241 p4(1) = yd(1) + y_pix_size/2;
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242
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243 m_glfcns.glBegin (GL_QUADS);
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244 m_glfcns.glVertex3dv (p1.data ());
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245 m_glfcns.glVertex3dv (p2.data ());
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246 m_glfcns.glVertex3dv (p3.data ());
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247 m_glfcns.glVertex3dv (p4.data ());
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248 m_glfcns.glEnd ();
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249 }
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250
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251 OCTAVE_END_NAMESPACE(octave)