| 1 | /////////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/common/glcmn.cpp |
| 3 | // Purpose: wxGLCanvasBase implementation |
| 4 | // Author: Vadim Zeitlin |
| 5 | // Created: 2007-04-09 |
| 6 | // RCS-ID: $Id$ |
| 7 | // Copyright: (c) 2007 Vadim Zeitlin <vadim@wxwindows.org> |
| 8 | // Licence: wxWindows licence |
| 9 | /////////////////////////////////////////////////////////////////////////////// |
| 10 | |
| 11 | // ============================================================================ |
| 12 | // declarations |
| 13 | // ============================================================================ |
| 14 | |
| 15 | // ---------------------------------------------------------------------------- |
| 16 | // headers |
| 17 | // ---------------------------------------------------------------------------- |
| 18 | |
| 19 | // for compilers that support precompilation, includes "wx.h". |
| 20 | #include "wx/wxprec.h" |
| 21 | |
| 22 | #ifdef __BORLANDC__ |
| 23 | #pragma hdrstop |
| 24 | #endif |
| 25 | |
| 26 | #if wxUSE_GLCANVAS |
| 27 | |
| 28 | #ifndef WX_PRECOMP |
| 29 | #include "wx/log.h" |
| 30 | #endif // WX_PRECOMP |
| 31 | |
| 32 | #include "wx/glcanvas.h" |
| 33 | |
| 34 | // DLL options compatibility check: |
| 35 | #include "wx/build.h" |
| 36 | WX_CHECK_BUILD_OPTIONS("wxGL") |
| 37 | |
| 38 | IMPLEMENT_CLASS(wxGLApp, wxApp) |
| 39 | |
| 40 | // ============================================================================ |
| 41 | // implementation |
| 42 | // ============================================================================ |
| 43 | |
| 44 | wxGLCanvasBase::wxGLCanvasBase() |
| 45 | { |
| 46 | #if WXWIN_COMPATIBILITY_2_8 |
| 47 | m_glContext = NULL; |
| 48 | #endif |
| 49 | |
| 50 | // we always paint background entirely ourselves so prevent wx from erasing |
| 51 | // it to avoid flicker |
| 52 | SetBackgroundStyle(wxBG_STYLE_CUSTOM); |
| 53 | } |
| 54 | |
| 55 | bool wxGLCanvasBase::SetCurrent(const wxGLContext& context) const |
| 56 | { |
| 57 | // although on MSW it works even if the window is still hidden, it doesn't |
| 58 | // work in other ports (notably X11-based ones) and documentation mentions |
| 59 | // that SetCurrent() can only be called for a shown window, so check for it |
| 60 | wxASSERT_MSG( IsShownOnScreen(), wxT("can't make hidden GL canvas current") ); |
| 61 | |
| 62 | |
| 63 | return context.SetCurrent(*static_cast<const wxGLCanvas *>(this)); |
| 64 | } |
| 65 | |
| 66 | bool wxGLCanvasBase::SetColour(const wxString& colour) |
| 67 | { |
| 68 | wxColour col = wxTheColourDatabase->Find(colour); |
| 69 | if ( !col.Ok() ) |
| 70 | return false; |
| 71 | |
| 72 | #ifdef wxHAS_OPENGL_ES |
| 73 | wxGLAPI::glColor3f((GLfloat) (col.Red() / 256.), (GLfloat) (col.Green() / 256.), |
| 74 | (GLfloat) (col.Blue() / 256.)); |
| 75 | #else |
| 76 | GLboolean isRGBA; |
| 77 | glGetBooleanv(GL_RGBA_MODE, &isRGBA); |
| 78 | if ( isRGBA ) |
| 79 | { |
| 80 | glColor3f((GLfloat) (col.Red() / 256.), (GLfloat) (col.Green() / 256.), |
| 81 | (GLfloat) (col.Blue() / 256.)); |
| 82 | } |
| 83 | else // indexed colour |
| 84 | { |
| 85 | GLint pix = GetColourIndex(col); |
| 86 | if ( pix == -1 ) |
| 87 | { |
| 88 | wxLogError(_("Failed to allocate colour for OpenGL")); |
| 89 | return false; |
| 90 | } |
| 91 | |
| 92 | glIndexi(pix); |
| 93 | } |
| 94 | #endif |
| 95 | return true; |
| 96 | } |
| 97 | |
| 98 | wxGLCanvasBase::~wxGLCanvasBase() |
| 99 | { |
| 100 | #if WXWIN_COMPATIBILITY_2_8 |
| 101 | delete m_glContext; |
| 102 | #endif // WXWIN_COMPATIBILITY_2_8 |
| 103 | } |
| 104 | |
| 105 | #if WXWIN_COMPATIBILITY_2_8 |
| 106 | |
| 107 | wxGLContext *wxGLCanvasBase::GetContext() const |
| 108 | { |
| 109 | return m_glContext; |
| 110 | } |
| 111 | |
| 112 | void wxGLCanvasBase::SetCurrent() |
| 113 | { |
| 114 | if ( m_glContext ) |
| 115 | SetCurrent(*m_glContext); |
| 116 | } |
| 117 | |
| 118 | void wxGLCanvasBase::OnSize(wxSizeEvent& WXUNUSED(event)) |
| 119 | { |
| 120 | } |
| 121 | |
| 122 | #endif // WXWIN_COMPATIBILITY_2_8 |
| 123 | |
| 124 | /* static */ |
| 125 | bool wxGLCanvasBase::IsExtensionInList(const char *list, const char *extension) |
| 126 | { |
| 127 | if ( !list ) |
| 128 | return false; |
| 129 | |
| 130 | for ( const char *p = list; *p; p++ ) |
| 131 | { |
| 132 | // advance up to the next possible match |
| 133 | p = wxStrstr(p, extension); |
| 134 | if ( !p ) |
| 135 | break; |
| 136 | |
| 137 | // check that the extension appears at the beginning/ending of the list |
| 138 | // or is preceded/followed by a space to avoid mistakenly finding |
| 139 | // "glExtension" in a list containing some "glFunkyglExtension" |
| 140 | if ( (p == list || p[-1] == ' ') ) |
| 141 | { |
| 142 | char c = p[strlen(extension)]; |
| 143 | if ( c == '\0' || c == ' ' ) |
| 144 | return true; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | return false; |
| 149 | } |
| 150 | |
| 151 | // ============================================================================ |
| 152 | // compatibility layer for OpenGL 3 and OpenGL ES |
| 153 | // ============================================================================ |
| 154 | |
| 155 | static wxGLAPI s_glAPI; |
| 156 | |
| 157 | #if wxUSE_OPENGL_EMULATION |
| 158 | |
| 159 | #include "wx/vector.h" |
| 160 | |
| 161 | static GLenum s_mode; |
| 162 | |
| 163 | static GLfloat s_currentTexCoord[2]; |
| 164 | static GLfloat s_currentColor[4]; |
| 165 | static GLfloat s_currentNormal[3]; |
| 166 | |
| 167 | // TODO move this into a different construct with locality for all attributes |
| 168 | // of a vertex |
| 169 | |
| 170 | static wxVector<GLfloat> s_texCoords; |
| 171 | static wxVector<GLfloat> s_vertices; |
| 172 | static wxVector<GLfloat> s_normals; |
| 173 | static wxVector<GLfloat> s_colors; |
| 174 | |
| 175 | static bool s_texCoordsUsed; |
| 176 | static bool s_colorsUsed; |
| 177 | static bool s_normalsUsed; |
| 178 | |
| 179 | bool SetState( int flag, bool desired ) |
| 180 | { |
| 181 | bool former = glIsEnabled( flag ); |
| 182 | if ( former != desired ) |
| 183 | { |
| 184 | if ( desired ) |
| 185 | glEnableClientState(flag); |
| 186 | else |
| 187 | glDisableClientState(flag); |
| 188 | } |
| 189 | return former; |
| 190 | } |
| 191 | |
| 192 | void RestoreState( int flag, bool desired ) |
| 193 | { |
| 194 | if ( desired ) |
| 195 | glEnableClientState(flag); |
| 196 | else |
| 197 | glDisableClientState(flag); |
| 198 | } |
| 199 | #endif |
| 200 | |
| 201 | wxGLAPI::wxGLAPI() |
| 202 | { |
| 203 | #if wxUSE_OPENGL_EMULATION |
| 204 | s_mode = 0xFF; |
| 205 | #endif |
| 206 | } |
| 207 | |
| 208 | wxGLAPI::~wxGLAPI() |
| 209 | { |
| 210 | } |
| 211 | |
| 212 | void wxGLAPI::glFrustum(GLfloat left, GLfloat right, GLfloat bottom, |
| 213 | GLfloat top, GLfloat zNear, GLfloat zFar) |
| 214 | { |
| 215 | #if wxUSE_OPENGL_EMULATION |
| 216 | ::glFrustumf(left, right, bottom, top, zNear, zFar); |
| 217 | #else |
| 218 | ::glFrustum(left, right, bottom, top, zNear, zFar); |
| 219 | #endif |
| 220 | } |
| 221 | |
| 222 | void wxGLAPI::glBegin(GLenum mode) |
| 223 | { |
| 224 | #if wxUSE_OPENGL_EMULATION |
| 225 | if ( s_mode != 0xFF ) |
| 226 | { |
| 227 | wxFAIL_MSG("nested glBegin"); |
| 228 | } |
| 229 | |
| 230 | s_mode = mode; |
| 231 | s_texCoordsUsed = false; |
| 232 | s_colorsUsed = false; |
| 233 | s_normalsUsed = false; |
| 234 | |
| 235 | s_texCoords.clear(); |
| 236 | s_normals.clear(); |
| 237 | s_colors.clear(); |
| 238 | s_vertices.clear(); |
| 239 | #else |
| 240 | ::glBegin(mode); |
| 241 | #endif |
| 242 | } |
| 243 | |
| 244 | void wxGLAPI::glTexCoord2f(GLfloat s, GLfloat t) |
| 245 | { |
| 246 | #if wxUSE_OPENGL_EMULATION |
| 247 | if ( s_mode == 0xFF ) |
| 248 | { |
| 249 | wxFAIL_MSG("glTexCoord2f called outside glBegin/glEnd"); |
| 250 | } |
| 251 | |
| 252 | else |
| 253 | { |
| 254 | s_texCoordsUsed = true; |
| 255 | s_currentTexCoord[0] = s; |
| 256 | s_currentTexCoord[1] = t; |
| 257 | } |
| 258 | #else |
| 259 | ::glTexCoord2f(s,t); |
| 260 | #endif |
| 261 | } |
| 262 | |
| 263 | void wxGLAPI::glVertex3f(GLfloat x, GLfloat y, GLfloat z) |
| 264 | { |
| 265 | #if wxUSE_OPENGL_EMULATION |
| 266 | if ( s_mode == 0xFF ) |
| 267 | { |
| 268 | wxFAIL_MSG("glVertex3f called outside glBegin/glEnd"); |
| 269 | } |
| 270 | else |
| 271 | { |
| 272 | s_texCoords.push_back(s_currentTexCoord[0]); |
| 273 | s_texCoords.push_back(s_currentTexCoord[1]); |
| 274 | |
| 275 | s_normals.push_back(s_currentNormal[0]); |
| 276 | s_normals.push_back(s_currentNormal[1]); |
| 277 | s_normals.push_back(s_currentNormal[2]); |
| 278 | |
| 279 | s_colors.push_back(s_currentColor[0]); |
| 280 | s_colors.push_back(s_currentColor[1]); |
| 281 | s_colors.push_back(s_currentColor[2]); |
| 282 | s_colors.push_back(s_currentColor[3]); |
| 283 | |
| 284 | s_vertices.push_back(x); |
| 285 | s_vertices.push_back(y); |
| 286 | s_vertices.push_back(z); |
| 287 | } |
| 288 | #else |
| 289 | ::glVertex3f(x,y,z); |
| 290 | #endif |
| 291 | } |
| 292 | |
| 293 | void wxGLAPI::glNormal3f(GLfloat nx, GLfloat ny, GLfloat nz) |
| 294 | { |
| 295 | #if wxUSE_OPENGL_EMULATION |
| 296 | if ( s_mode == 0xFF ) |
| 297 | ::glNormal3f(nx,ny,nz); |
| 298 | else |
| 299 | { |
| 300 | s_normalsUsed = true; |
| 301 | s_currentNormal[0] = nx; |
| 302 | s_currentNormal[1] = ny; |
| 303 | s_currentNormal[2] = nz; |
| 304 | } |
| 305 | #else |
| 306 | ::glNormal3f(nx,ny,nz); |
| 307 | #endif |
| 308 | } |
| 309 | |
| 310 | void wxGLAPI::glColor4f(GLfloat r, GLfloat g, GLfloat b, GLfloat a) |
| 311 | { |
| 312 | #if wxUSE_OPENGL_EMULATION |
| 313 | if ( s_mode == 0xFF ) |
| 314 | ::glColor4f(r,g,b,a); |
| 315 | else |
| 316 | { |
| 317 | s_colorsUsed = true; |
| 318 | s_currentColor[0] = r; |
| 319 | s_currentColor[1] = g; |
| 320 | s_currentColor[2] = b; |
| 321 | s_currentColor[3] = a; |
| 322 | } |
| 323 | #else |
| 324 | ::glColor4f(r,g,b,a); |
| 325 | #endif |
| 326 | } |
| 327 | |
| 328 | void wxGLAPI::glColor3f(GLfloat r, GLfloat g, GLfloat b) |
| 329 | { |
| 330 | #if wxUSE_OPENGL_EMULATION |
| 331 | glColor4f(r,g,b,1.0); |
| 332 | #else |
| 333 | ::glColor3f(r,g,b); |
| 334 | #endif |
| 335 | } |
| 336 | |
| 337 | void wxGLAPI::glEnd() |
| 338 | { |
| 339 | #if wxUSE_OPENGL_EMULATION |
| 340 | bool formerColors = SetState( GL_COLOR_ARRAY, s_colorsUsed ); |
| 341 | bool formerNormals = SetState( GL_NORMAL_ARRAY, s_normalsUsed ); |
| 342 | bool formerTexCoords = SetState( GL_TEXTURE_COORD_ARRAY, s_texCoordsUsed ); |
| 343 | bool formerVertex = glIsEnabled(GL_VERTEX_ARRAY); |
| 344 | |
| 345 | if( !formerVertex ) |
| 346 | glEnableClientState(GL_VERTEX_ARRAY); |
| 347 | |
| 348 | if ( s_colorsUsed ) |
| 349 | glColorPointer( 4, GL_FLOAT, 0, &s_colors[0] ); |
| 350 | |
| 351 | if ( s_normalsUsed ) |
| 352 | glNormalPointer( GL_FLOAT, 0, &s_normals[0] ); |
| 353 | |
| 354 | if ( s_texCoordsUsed ) |
| 355 | glTexCoordPointer( 2, GL_FLOAT, 0, &s_texCoords[0] ); |
| 356 | |
| 357 | glVertexPointer(3, GL_FLOAT, 0, &s_vertices[0]); |
| 358 | glDrawArrays( s_mode, 0, s_vertices.size() / 3 ); |
| 359 | |
| 360 | if ( s_colorsUsed != formerColors ) |
| 361 | RestoreState( GL_COLOR_ARRAY, formerColors ); |
| 362 | |
| 363 | if ( s_normalsUsed != formerNormals ) |
| 364 | RestoreState( GL_NORMAL_ARRAY, formerColors ); |
| 365 | |
| 366 | if ( s_texCoordsUsed != formerTexCoords ) |
| 367 | RestoreState( GL_TEXTURE_COORD_ARRAY, formerColors ); |
| 368 | |
| 369 | if( !formerVertex ) |
| 370 | glDisableClientState(GL_VERTEX_ARRAY); |
| 371 | |
| 372 | s_mode = 0xFF; |
| 373 | #else |
| 374 | ::glEnd(); |
| 375 | #endif |
| 376 | } |
| 377 | |
| 378 | #endif // wxUSE_GLCANVAS |
| 379 | |