1 /*
2 * fg_state.c
3 *
4 * Freeglut state query methods.
5 *
6 * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
7 * Written by Pawel W. Olszta, <olszta@sourceforge.net>
8 * Creation date: Thu Dec 16 1999
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included
18 * in all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
24 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
25 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28 #include <GL/freeglut.h>
29 #include "fg_internal.h"
30
31 /*
32 * TODO BEFORE THE STABLE RELEASE:
33 *
34 * glutGet() -- X11 tests passed, but check if all enums
35 * handled (what about Win32?)
36 * glutDeviceGet() -- X11 tests passed, but check if all enums
37 * handled (what about Win32?)
38 * glutGetModifiers() -- OK, but could also remove the limitation
39 * glutLayerGet() -- what about GLUT_NORMAL_DAMAGED?
40 *
41 * The fail-on-call policy will help adding the most needed things imho.
42 */
43
44 extern int fgPlatformGlutGet ( GLenum eWhat );
45 extern int fgPlatformGlutDeviceGet ( GLenum eWhat );
46 extern int *fgPlatformGlutGetModeValues(GLenum eWhat, int *size);
47 extern SFG_Font* fghFontByID( void* font );
48
49
50 /* -- LOCAL DEFINITIONS ---------------------------------------------------- */
51
52 /* -- PRIVATE FUNCTIONS ---------------------------------------------------- */
53
54
55 /* -- INTERFACE FUNCTIONS -------------------------------------------------- */
56
57 /*
58 * General settings assignment method
59 */
glutSetOption(GLenum eWhat,int value)60 void FGAPIENTRY glutSetOption( GLenum eWhat, int value )
61 {
62 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSetOption" );
63
64 switch( eWhat )
65 {
66 case GLUT_INIT_WINDOW_X:
67 fgState.Position.X = (GLint)value;
68 break;
69
70 case GLUT_INIT_WINDOW_Y:
71 fgState.Position.Y = (GLint)value;
72 break;
73
74 case GLUT_INIT_WINDOW_WIDTH:
75 fgState.Size.X = (GLint)value;
76 break;
77
78 case GLUT_INIT_WINDOW_HEIGHT:
79 fgState.Size.Y = (GLint)value;
80 break;
81
82 case GLUT_INIT_DISPLAY_MODE:
83 fgState.DisplayMode = (unsigned int)value;
84 break;
85
86 case GLUT_ACTION_ON_WINDOW_CLOSE:
87 fgState.ActionOnWindowClose = value;
88 break;
89
90 case GLUT_RENDERING_CONTEXT:
91 fgState.UseCurrentContext =
92 ( value == GLUT_USE_CURRENT_CONTEXT ) ? GL_TRUE : GL_FALSE;
93 break;
94
95 case GLUT_DIRECT_RENDERING:
96 fgState.DirectContext = value;
97 break;
98
99 case GLUT_WINDOW_CURSOR:
100 if( fgStructure.CurrentWindow != NULL )
101 fgStructure.CurrentWindow->State.Cursor = value;
102 break;
103
104 case GLUT_AUX:
105 fgState.AuxiliaryBufferNumber = value;
106 break;
107
108 case GLUT_MULTISAMPLE:
109 fgState.SampleNumber = value;
110 break;
111
112 case GLUT_SKIP_STALE_MOTION_EVENTS:
113 fgState.SkipStaleMotion = !!value;
114 break;
115
116 case GLUT_GEOMETRY_VISUALIZE_NORMALS:
117 if( fgStructure.CurrentWindow != NULL )
118 fgStructure.CurrentWindow->State.VisualizeNormals = !!value;
119 break;
120
121 case GLUT_STROKE_FONT_DRAW_JOIN_DOTS:
122 fgState.StrokeFontDrawJoinDots = !!value;
123 break;
124
125 default:
126 fgWarning( "glutSetOption(): missing enum handle %d", eWhat );
127 break;
128 }
129 }
130
131 /*
132 * General settings query method
133 */
glutGet(GLenum eWhat)134 int FGAPIENTRY glutGet( GLenum eWhat )
135 {
136 switch (eWhat)
137 {
138 case GLUT_INIT_STATE:
139 return fgState.Initialised;
140
141 /* Although internally the time store is 64bits wide, the return value
142 * here still wraps every 49.7 days. Integer overflows cancel however
143 * when subtracting an initial start time, unless the total time exceeds
144 * 32-bit, so you can still work with this.
145 * XXX: a glutGet64 to return the time might be an idea...
146 */
147 case GLUT_ELAPSED_TIME:
148 return (int) fgElapsedTime();
149 }
150
151 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutGet" );
152
153 switch( eWhat )
154 {
155 /* Following values are stored in fgState and fgDisplay global structures */
156 case GLUT_SCREEN_WIDTH: return fgDisplay.ScreenWidth ;
157 case GLUT_SCREEN_HEIGHT: return fgDisplay.ScreenHeight ;
158 case GLUT_SCREEN_WIDTH_MM: return fgDisplay.ScreenWidthMM ;
159 case GLUT_SCREEN_HEIGHT_MM: return fgDisplay.ScreenHeightMM;
160 case GLUT_INIT_WINDOW_X: return fgState.Position.Use ?
161 fgState.Position.X : -1 ;
162 case GLUT_INIT_WINDOW_Y: return fgState.Position.Use ?
163 fgState.Position.Y : -1 ;
164 case GLUT_INIT_WINDOW_WIDTH: return fgState.Size.Use ?
165 fgState.Size.X : -1 ;
166 case GLUT_INIT_WINDOW_HEIGHT: return fgState.Size.Use ?
167 fgState.Size.Y : -1 ;
168 case GLUT_INIT_DISPLAY_MODE: return fgState.DisplayMode ;
169 case GLUT_INIT_MAJOR_VERSION: return fgState.MajorVersion ;
170 case GLUT_INIT_MINOR_VERSION: return fgState.MinorVersion ;
171 case GLUT_INIT_FLAGS: return fgState.ContextFlags ;
172 case GLUT_INIT_PROFILE: return fgState.ContextProfile ;
173
174 /* The window structure queries */
175 case GLUT_WINDOW_PARENT:
176 if( fgStructure.CurrentWindow == NULL ) return 0;
177 if( fgStructure.CurrentWindow->Parent == NULL ) return 0;
178 return fgStructure.CurrentWindow->Parent->ID;
179
180 case GLUT_WINDOW_NUM_CHILDREN:
181 if( fgStructure.CurrentWindow == NULL )
182 return 0;
183 return fgListLength( &fgStructure.CurrentWindow->Children );
184
185 case GLUT_WINDOW_CURSOR:
186 if( fgStructure.CurrentWindow == NULL )
187 return 0;
188 return fgStructure.CurrentWindow->State.Cursor;
189
190 case GLUT_MENU_NUM_ITEMS:
191 if( fgStructure.CurrentMenu == NULL )
192 return 0;
193 return fgListLength( &fgStructure.CurrentMenu->Entries );
194
195 case GLUT_ACTION_ON_WINDOW_CLOSE:
196 return fgState.ActionOnWindowClose;
197
198 case GLUT_VERSION :
199 return VERSION_MAJOR * 10000 + VERSION_MINOR * 100 + VERSION_PATCH;
200
201 case GLUT_RENDERING_CONTEXT:
202 return fgState.UseCurrentContext ? GLUT_USE_CURRENT_CONTEXT
203 : GLUT_CREATE_NEW_CONTEXT;
204
205 case GLUT_DIRECT_RENDERING:
206 return fgState.DirectContext;
207
208 case GLUT_FULL_SCREEN:
209 return fgStructure.CurrentWindow->State.IsFullscreen;
210
211 case GLUT_AUX:
212 return fgState.AuxiliaryBufferNumber;
213
214 case GLUT_MULTISAMPLE:
215 return fgState.SampleNumber;
216
217 case GLUT_SKIP_STALE_MOTION_EVENTS:
218 return fgState.SkipStaleMotion;
219
220 case GLUT_GEOMETRY_VISUALIZE_NORMALS:
221 if( fgStructure.CurrentWindow == NULL )
222 return GL_FALSE;
223 return fgStructure.CurrentWindow->State.VisualizeNormals;
224
225 case GLUT_STROKE_FONT_DRAW_JOIN_DOTS:
226 return fgState.StrokeFontDrawJoinDots;
227
228 default:
229 return fgPlatformGlutGet ( eWhat );
230 break;
231 }
232 }
233
234 /*
235 * Returns various device information.
236 */
glutDeviceGet(GLenum eWhat)237 int FGAPIENTRY glutDeviceGet( GLenum eWhat )
238 {
239 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutDeviceGet" );
240
241 /* XXX WARNING: we are mostly lying in this function. */
242 switch( eWhat )
243 {
244 case GLUT_HAS_JOYSTICK:
245 return fgJoystickDetect ();
246
247 case GLUT_OWNS_JOYSTICK:
248 return fgState.JoysticksInitialised;
249
250 case GLUT_JOYSTICK_POLL_RATE:
251 return fgStructure.CurrentWindow ? fgStructure.CurrentWindow->State.JoystickPollRate : 0;
252
253 /* XXX The following two are only for Joystick 0 but this is an improvement */
254 case GLUT_JOYSTICK_BUTTONS:
255 return glutJoystickGetNumButtons ( 0 );
256
257 case GLUT_JOYSTICK_AXES:
258 return glutJoystickGetNumAxes ( 0 );
259
260 case GLUT_HAS_DIAL_AND_BUTTON_BOX:
261 return fgInputDeviceDetect ();
262
263 case GLUT_NUM_DIALS:
264 if ( fgState.InputDevsInitialised ) return 8;
265 return 0;
266
267 case GLUT_NUM_BUTTON_BOX_BUTTONS:
268 return 0;
269
270 case GLUT_HAS_SPACEBALL:
271 return fgHasSpaceball();
272
273 case GLUT_HAS_TABLET:
274 return 0;
275
276 case GLUT_NUM_SPACEBALL_BUTTONS:
277 return fgSpaceballNumButtons();
278
279 case GLUT_NUM_TABLET_BUTTONS:
280 return 0;
281
282 case GLUT_DEVICE_IGNORE_KEY_REPEAT:
283 return fgStructure.CurrentWindow ? fgStructure.CurrentWindow->State.IgnoreKeyRepeat : 0;
284
285 case GLUT_DEVICE_KEY_REPEAT:
286 return fgState.KeyRepeat;
287
288 default:
289 return fgPlatformGlutDeviceGet ( eWhat );
290 }
291 }
292
293 /*
294 * This should return the current state of ALT, SHIFT and CTRL keys.
295 */
glutGetModifiers(void)296 int FGAPIENTRY glutGetModifiers( void )
297 {
298 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutGetModifiers" );
299 if( fgState.Modifiers == INVALID_MODIFIERS )
300 {
301 fgWarning( "glutGetModifiers() called outside an input callback" );
302 return 0;
303 }
304
305 return fgState.Modifiers;
306 }
307
308 /*
309 * Return the state of the GLUT API overlay subsystem. A misery ;-)
310 */
glutLayerGet(GLenum eWhat)311 int FGAPIENTRY glutLayerGet( GLenum eWhat )
312 {
313 FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutLayerGet" );
314
315 /*
316 * This is easy as layers are not implemented and
317 * overlay support is not planned. E.g. on Windows,
318 * overlay requests in PFDs are ignored
319 * (see iLayerType at http://msdn.microsoft.com/en-us/library/dd368826(v=vs.85).aspx)
320 */
321 switch( eWhat )
322 {
323
324 case GLUT_OVERLAY_POSSIBLE:
325 return 0 ;
326
327 case GLUT_LAYER_IN_USE:
328 return GLUT_NORMAL;
329
330 case GLUT_HAS_OVERLAY:
331 return 0;
332
333 case GLUT_TRANSPARENT_INDEX:
334 /*
335 * Return just anything, which is always defined as zero
336 *
337 * XXX HUH?
338 */
339 return 0;
340
341 case GLUT_NORMAL_DAMAGED:
342 /* XXX Actually I do not know. Maybe. */
343 return 0;
344
345 case GLUT_OVERLAY_DAMAGED:
346 return -1;
347
348 default:
349 fgWarning( "glutLayerGet(): missing enum handle %d", eWhat );
350 break;
351 }
352
353 /* And fail. That's good. Programs do love failing. */
354 return -1;
355 }
356
glutGetModeValues(GLenum eWhat,int * size)357 int * FGAPIENTRY glutGetModeValues(GLenum eWhat, int *size)
358 {
359 int *array;
360
361 FREEGLUT_EXIT_IF_NOT_INITIALISED("glutGetModeValues");
362
363 *size = 0;
364 array = fgPlatformGlutGetModeValues ( eWhat, size );
365
366 return array;
367 }
368
369 /*** END OF FILE ***/
370