| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: glcanvas.cpp |
| 3 | // Purpose: wxGLCanvas, for using OpenGL with wxWindows 2.0 for Motif. |
| 4 | // Uses the GLX extension. |
| 5 | // Author: Julian Smart and Wolfram Gloger |
| 6 | // Modified by: |
| 7 | // Created: 1995, 1999 |
| 8 | // RCS-ID: $Id$ |
| 9 | // Copyright: (c) Julian Smart, Wolfram Gloger |
| 10 | // Licence: wxWindows licence |
| 11 | ///////////////////////////////////////////////////////////////////////////// |
| 12 | |
| 13 | #ifdef __GNUG__ |
| 14 | #pragma implementation "glcanvas.h" |
| 15 | #endif |
| 16 | |
| 17 | #include "wx/setup.h" |
| 18 | |
| 19 | #if wxUSE_GLCANVAS |
| 20 | |
| 21 | #include "wx/glcanvas.h" |
| 22 | #include "wx/utils.h" |
| 23 | #include "wx/app.h" |
| 24 | |
| 25 | #ifdef __VMS |
| 26 | # pragma message disable nosimpint |
| 27 | #endif |
| 28 | #include <Xm/Xm.h> |
| 29 | #ifdef __VMS |
| 30 | # pragma message enable nosimpint |
| 31 | #endif |
| 32 | #include "wx/motif/private.h" |
| 33 | |
| 34 | #ifdef OLD_MESA |
| 35 | // workaround for bug in Mesa's glx.c |
| 36 | static int bitcount( unsigned long n ) |
| 37 | { |
| 38 | int bits; |
| 39 | for (bits=0; n>0;) { |
| 40 | if(n & 1) bits++; |
| 41 | n = n >> 1; |
| 42 | } |
| 43 | return bits; |
| 44 | } |
| 45 | #endif |
| 46 | |
| 47 | /* |
| 48 | * GLContext implementation |
| 49 | */ |
| 50 | |
| 51 | IMPLEMENT_CLASS(wxGLContext,wxObject) |
| 52 | |
| 53 | wxGLContext::wxGLContext( bool WXUNUSED(isRGB), wxWindow *win, |
| 54 | const wxPalette& WXUNUSED(palette) ) |
| 55 | { |
| 56 | m_window = win; |
| 57 | // m_widget = win->m_wxwindow; |
| 58 | |
| 59 | wxGLCanvas *gc = (wxGLCanvas*) win; |
| 60 | XVisualInfo *vi = (XVisualInfo *) gc->m_vi; |
| 61 | |
| 62 | wxCHECK_RET( vi, "invalid visual for OpenGl" ); |
| 63 | |
| 64 | m_glContext = glXCreateContext( (Display *)wxGetDisplay(), vi, |
| 65 | None, GL_TRUE); |
| 66 | |
| 67 | wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" ); |
| 68 | } |
| 69 | |
| 70 | wxGLContext::wxGLContext( |
| 71 | bool WXUNUSED(isRGB), wxWindow *win, |
| 72 | const wxPalette& WXUNUSED(palette), |
| 73 | const wxGLContext *other /* for sharing display lists */ |
| 74 | ) |
| 75 | { |
| 76 | m_window = win; |
| 77 | // m_widget = win->m_wxwindow; |
| 78 | |
| 79 | wxGLCanvas *gc = (wxGLCanvas*) win; |
| 80 | XVisualInfo *vi = (XVisualInfo *) gc->m_vi; |
| 81 | |
| 82 | wxCHECK_RET( vi, "invalid visual for OpenGl" ); |
| 83 | |
| 84 | if( other != 0 ) |
| 85 | m_glContext = glXCreateContext( (Display *)wxGetDisplay(), vi, |
| 86 | other->m_glContext, GL_TRUE ); |
| 87 | else |
| 88 | m_glContext = glXCreateContext( (Display *)wxGetDisplay(), vi, |
| 89 | None, GL_TRUE ); |
| 90 | |
| 91 | wxCHECK_RET( m_glContext, "Couldn't create OpenGl context" ); |
| 92 | } |
| 93 | |
| 94 | wxGLContext::~wxGLContext() |
| 95 | { |
| 96 | if (!m_glContext) return; |
| 97 | |
| 98 | if (m_glContext == glXGetCurrentContext()) |
| 99 | { |
| 100 | glXMakeCurrent( (Display*) wxGetDisplay(), None, NULL); |
| 101 | } |
| 102 | |
| 103 | glXDestroyContext( (Display*) wxGetDisplay(), m_glContext ); |
| 104 | } |
| 105 | |
| 106 | void wxGLContext::SwapBuffers() |
| 107 | { |
| 108 | if (m_glContext) |
| 109 | { |
| 110 | Display* display = (Display*) wxGetDisplay(); |
| 111 | glXSwapBuffers(display, (Window) m_window->GetClientWindow()); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | void wxGLContext::SetCurrent() |
| 116 | { |
| 117 | if (m_glContext) |
| 118 | { |
| 119 | Display* display = (Display*) wxGetDisplay(); |
| 120 | glXMakeCurrent(display, (Window) m_window->GetClientWindow(), |
| 121 | m_glContext );; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | void wxGLContext::SetColour(const char *colour) |
| 126 | { |
| 127 | wxColour *the_colour = wxTheColourDatabase->FindColour(colour); |
| 128 | if(the_colour) { |
| 129 | GLboolean b; |
| 130 | glGetBooleanv(GL_RGBA_MODE, &b); |
| 131 | if(b) { |
| 132 | glColor3ub(the_colour->Red(), |
| 133 | the_colour->Green(), |
| 134 | the_colour->Blue()); |
| 135 | } else { |
| 136 | the_colour->CalcPixel(wxTheApp->GetMainColormap(wxGetDisplay())); |
| 137 | GLint pix = (GLint)the_colour->GetPixel(); |
| 138 | if(pix == -1) |
| 139 | { |
| 140 | wxLogError("wxGLCanvas: cannot allocate color\n"); |
| 141 | return; |
| 142 | } |
| 143 | glIndexi(pix); |
| 144 | } |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | void wxGLContext::SetupPixelFormat() |
| 149 | { |
| 150 | } |
| 151 | |
| 152 | void wxGLContext::SetupPalette( const wxPalette& WXUNUSED(palette) ) |
| 153 | { |
| 154 | } |
| 155 | |
| 156 | wxPalette wxGLContext::CreateDefaultPalette() |
| 157 | { |
| 158 | return wxNullPalette; |
| 159 | } |
| 160 | |
| 161 | |
| 162 | |
| 163 | |
| 164 | /* |
| 165 | * GLCanvas implementation |
| 166 | */ |
| 167 | |
| 168 | IMPLEMENT_CLASS(wxGLCanvas, wxScrolledWindow) |
| 169 | |
| 170 | BEGIN_EVENT_TABLE(wxGLCanvas, wxScrolledWindow) |
| 171 | // EVT_SIZE(wxGLCanvas::OnSize) |
| 172 | END_EVENT_TABLE() |
| 173 | |
| 174 | |
| 175 | wxGLCanvas::wxGLCanvas( wxWindow *parent, wxWindowID id, |
| 176 | const wxPoint& pos, const wxSize& size, |
| 177 | long style, const wxString& name, |
| 178 | int *attribList, |
| 179 | const wxPalette& palette ) |
| 180 | : wxScrolledWindow(parent, id, pos, size, style, name) |
| 181 | { |
| 182 | Create( parent, NULL, NULL, id, pos, size, style, name, attribList, palette ); |
| 183 | } |
| 184 | |
| 185 | wxGLCanvas::wxGLCanvas( wxWindow *parent, |
| 186 | const wxGLContext *shared, |
| 187 | wxWindowID id, |
| 188 | const wxPoint& pos, const wxSize& size, |
| 189 | long style, const wxString& name, |
| 190 | int *attribList, |
| 191 | const wxPalette& palette ) |
| 192 | : wxScrolledWindow(parent, id, pos, size, style, name) |
| 193 | { |
| 194 | Create( parent, shared, NULL, id, pos, size, style, name, attribList, palette ); |
| 195 | } |
| 196 | |
| 197 | wxGLCanvas::wxGLCanvas( wxWindow *parent, |
| 198 | const wxGLCanvas *shared, |
| 199 | wxWindowID id, |
| 200 | const wxPoint& pos, const wxSize& size, |
| 201 | long style, const wxString& name, |
| 202 | int *attribList, |
| 203 | const wxPalette& palette ) |
| 204 | : wxScrolledWindow(parent, id, pos, size, style, name) |
| 205 | { |
| 206 | Create( parent, NULL, shared, id, pos, size, style, name, attribList, palette ); |
| 207 | } |
| 208 | |
| 209 | |
| 210 | /* |
| 211 | bool wxGLCanvas::Create(wxWindow *parent, |
| 212 | const wxGLContext *shared, const wxGLCanvas *shared_context_of, |
| 213 | wxWindowID id = -1, const wxPoint& pos, |
| 214 | const wxSize& size, long style, |
| 215 | const wxString& name, int *attribList, const wxPalette& palette): |
| 216 | wxScrolledWindow(parent, id, pos, size, style, name) |
| 217 | */ |
| 218 | |
| 219 | bool wxGLCanvas::Create( wxWindow *parent, |
| 220 | const wxGLContext *shared, |
| 221 | const wxGLCanvas *shared_context_of, |
| 222 | wxWindowID id, |
| 223 | const wxPoint& pos, const wxSize& size, |
| 224 | long style, const wxString& name, |
| 225 | int *attribList, |
| 226 | const wxPalette& palette) |
| 227 | { |
| 228 | XVisualInfo *vi, vi_templ; |
| 229 | XWindowAttributes xwa; |
| 230 | int val, n; |
| 231 | |
| 232 | m_sharedContext = (wxGLContext*)shared; // const_cast |
| 233 | m_sharedContextOf = (wxGLCanvas*)shared_context_of; // const_cast |
| 234 | m_glContext = (wxGLContext*) NULL; |
| 235 | |
| 236 | Display* display = (Display*) wxGetDisplay(); |
| 237 | |
| 238 | // Check for the presence of the GLX extension |
| 239 | if(!glXQueryExtension(display, NULL, NULL)) { |
| 240 | wxDebugMsg("wxGLCanvas: GLX extension is missing\n"); |
| 241 | return false; |
| 242 | } |
| 243 | |
| 244 | if(attribList) { |
| 245 | int data[512], arg=0, p=0; |
| 246 | |
| 247 | while( (attribList[arg]!=0) && (p<512) ) |
| 248 | { |
| 249 | switch( attribList[arg++] ) |
| 250 | { |
| 251 | case WX_GL_RGBA: data[p++] = GLX_RGBA; break; |
| 252 | case WX_GL_BUFFER_SIZE: |
| 253 | data[p++]=GLX_BUFFER_SIZE; data[p++]=attribList[arg++]; break; |
| 254 | case WX_GL_LEVEL: |
| 255 | data[p++]=GLX_LEVEL; data[p++]=attribList[arg++]; break; |
| 256 | case WX_GL_DOUBLEBUFFER: data[p++] = GLX_DOUBLEBUFFER; break; |
| 257 | case WX_GL_STEREO: data[p++] = GLX_STEREO; break; |
| 258 | case WX_GL_AUX_BUFFERS: |
| 259 | data[p++]=GLX_AUX_BUFFERS; data[p++]=attribList[arg++]; break; |
| 260 | case WX_GL_MIN_RED: |
| 261 | data[p++]=GLX_RED_SIZE; data[p++]=attribList[arg++]; break; |
| 262 | case WX_GL_MIN_GREEN: |
| 263 | data[p++]=GLX_GREEN_SIZE; data[p++]=attribList[arg++]; break; |
| 264 | case WX_GL_MIN_BLUE: |
| 265 | data[p++]=GLX_BLUE_SIZE; data[p++]=attribList[arg++]; break; |
| 266 | case WX_GL_MIN_ALPHA: |
| 267 | data[p++]=GLX_ALPHA_SIZE; data[p++]=attribList[arg++]; break; |
| 268 | case WX_GL_DEPTH_SIZE: |
| 269 | data[p++]=GLX_DEPTH_SIZE; data[p++]=attribList[arg++]; break; |
| 270 | case WX_GL_STENCIL_SIZE: |
| 271 | data[p++]=GLX_STENCIL_SIZE; data[p++]=attribList[arg++]; break; |
| 272 | case WX_GL_MIN_ACCUM_RED: |
| 273 | data[p++]=GLX_ACCUM_RED_SIZE; data[p++]=attribList[arg++]; break; |
| 274 | case WX_GL_MIN_ACCUM_GREEN: |
| 275 | data[p++]=GLX_ACCUM_GREEN_SIZE; data[p++]=attribList[arg++]; break; |
| 276 | case WX_GL_MIN_ACCUM_BLUE: |
| 277 | data[p++]=GLX_ACCUM_BLUE_SIZE; data[p++]=attribList[arg++]; break; |
| 278 | case WX_GL_MIN_ACCUM_ALPHA: |
| 279 | data[p++]=GLX_ACCUM_ALPHA_SIZE; data[p++]=attribList[arg++]; break; |
| 280 | default: |
| 281 | break; |
| 282 | } |
| 283 | } |
| 284 | data[p] = 0; |
| 285 | |
| 286 | attribList = (int*) data; |
| 287 | // Get an appropriate visual |
| 288 | vi = glXChooseVisual(display, DefaultScreen(display), attribList); |
| 289 | if(!vi) return false; |
| 290 | |
| 291 | // Here we should make sure that vi is the same visual as the |
| 292 | // one used by the xwindow drawable in wxCanvas. However, |
| 293 | // there is currently no mechanism for this in wx_canvs.cc. |
| 294 | } else { |
| 295 | // By default, we use the visual of xwindow |
| 296 | // NI: is this really senseful ? opengl in e.g. color index mode ? |
| 297 | XGetWindowAttributes(display, (Window) GetClientWindow(), &xwa); |
| 298 | vi_templ.visualid = XVisualIDFromVisual(xwa.visual); |
| 299 | vi = XGetVisualInfo(display, VisualIDMask, &vi_templ, &n); |
| 300 | if(!vi) return false; |
| 301 | glXGetConfig(display, vi, GLX_USE_GL, &val); |
| 302 | if(!val) return false; |
| 303 | // Basically, this is it. It should be possible to use vi |
| 304 | // in glXCreateContext() below. But this fails with Mesa. |
| 305 | // I notified the Mesa author about it; there may be a fix. |
| 306 | #ifdef OLD_MESA |
| 307 | // Construct an attribute list matching the visual |
| 308 | int a_list[32]; |
| 309 | n = 0; |
| 310 | if(vi->c_class==TrueColor || vi->c_class==DirectColor) { // RGBA visual |
| 311 | a_list[n++] = GLX_RGBA; |
| 312 | a_list[n++] = GLX_RED_SIZE; |
| 313 | a_list[n++] = bitcount(vi->red_mask); |
| 314 | a_list[n++] = GLX_GREEN_SIZE; |
| 315 | a_list[n++] = bitcount(vi->green_mask); |
| 316 | a_list[n++] = GLX_BLUE_SIZE; |
| 317 | a_list[n++] = bitcount(vi->blue_mask); |
| 318 | glXGetConfig(display, vi, GLX_ALPHA_SIZE, &val); |
| 319 | a_list[n++] = GLX_ALPHA_SIZE; |
| 320 | a_list[n++] = val; |
| 321 | } else { // Color index visual |
| 322 | glXGetConfig(display, vi, GLX_BUFFER_SIZE, &val); |
| 323 | a_list[n++] = GLX_BUFFER_SIZE; |
| 324 | a_list[n++] = val; |
| 325 | } |
| 326 | a_list[n] = None; |
| 327 | // XFree(vi); |
| 328 | vi = glXChooseVisual(display, DefaultScreen(display), a_list); |
| 329 | if(!vi) return false; |
| 330 | #endif /* OLD_MESA */ |
| 331 | } |
| 332 | |
| 333 | m_vi = vi; // safe for later use |
| 334 | |
| 335 | wxCHECK_MSG( m_vi, FALSE, "required visual couldn't be found" ); |
| 336 | |
| 337 | // Create the GLX context and make it current |
| 338 | |
| 339 | wxGLContext *share= m_sharedContext; |
| 340 | if (share==NULL && m_sharedContextOf) |
| 341 | share = m_sharedContextOf->GetContext(); |
| 342 | |
| 343 | m_glContext = new wxGLContext( TRUE, this, wxNullPalette, share ); |
| 344 | |
| 345 | #ifndef OLD_MESA |
| 346 | // XFree(vi); |
| 347 | #endif |
| 348 | SetCurrent(); |
| 349 | |
| 350 | return true; |
| 351 | } |
| 352 | |
| 353 | wxGLCanvas::~wxGLCanvas(void) |
| 354 | { |
| 355 | XVisualInfo *vi = (XVisualInfo *) m_vi; |
| 356 | |
| 357 | if (vi) XFree( vi ); |
| 358 | if (m_glContext) delete m_glContext; |
| 359 | |
| 360 | // Display* display = (Display*) GetXDisplay(); |
| 361 | // if(glx_cx) glXDestroyContext(display, glx_cx); |
| 362 | } |
| 363 | |
| 364 | void wxGLCanvas::SwapBuffers() |
| 365 | { |
| 366 | if( m_glContext ) m_glContext->SwapBuffers(); |
| 367 | |
| 368 | // Display* display = (Display*) GetXDisplay(); |
| 369 | // if(glx_cx) glXSwapBuffers(display, (Window) GetClientWindow()); |
| 370 | } |
| 371 | |
| 372 | void wxGLCanvas::SetCurrent() |
| 373 | { |
| 374 | if( m_glContext ) m_glContext->SetCurrent(); |
| 375 | |
| 376 | // Display* display = (Display*) GetXDisplay(); |
| 377 | // if(glx_cx) glXMakeCurrent(display, (Window) GetClientWindow(), glx_cx); |
| 378 | } |
| 379 | |
| 380 | void wxGLCanvas::SetColour(const char *col) |
| 381 | { |
| 382 | if( m_glContext ) m_glContext->SetColour(col); |
| 383 | } |
| 384 | |
| 385 | #endif |
| 386 | // wxUSE_GLCANVAS |
| 387 | |