istereo2: 643f4ab609a4 libs/goatkit/theme.cc

istereo2

view libs/goatkit/theme.cc @ 35:643f4ab609a4

added readme and license

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 31 Oct 2015 05:45:35 +0200
parents	64e15874f3bd
children

line source

1 /*

2 GoatKit - a themable/animated widget toolkit for games

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU Lesser General Public License as published by

7 the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU Lesser General Public License for more details.

15 You should have received a copy of the GNU Lesser General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

18 #include "config.h"

19 #include <stdio.h>

20 #include <vector>

21 #include <string>

22 #include <map>

23 #include <algorithm>

24 #include <string.h>

25 #include "theme.h"

26 #include "widget.h"

28 #ifdef WIN32

29 #include <windows.h>

31 #define RTLD_DEFAULT ((void*)0)

33 static void *dlopen(const char *name, int flags);

34 static void dlclose(void *so);

35 static void *dlsym(void *so, const char *symbol);

36 #else

37 #include <unistd.h>

38 #include <dlfcn.h>

39 #endif

41 #ifdef HAVE_OPENGL_H

42 #include "opengl.h"

44 #else

46 #ifdef __APPLE__

47 #include <OpenGL/gl.h>

48 #else

49 #include <GL/gl.h>

50 #endif

52 #endif /* HAVE_OPENGL_H_ */

54 #ifndef PREFIX

55 #define PREFIX "/usr/local"

56 #endif

58 namespace goatkit {

60 struct ThemeImpl {

61 void *so;

62 WidgetDrawFunc (*lookup_theme_draw_func)(const char*);

63 mutable std::map<std::string, WidgetDrawFunc> func_cache;

64 };

66 Theme *theme;

67 static std::vector<std::string> search_paths;

68 static const char *fallback_paths[] = {

69 PREFIX "/share/goatkit",

70 0

71 };

73 typedef std::map<std::string, Theme*> ThemeMap;

74 static ThemeMap *themes;

77 void add_theme_path(const char *path)

78 {

79 if(!path || !*path) return;

81 std::string s = path;

82 int last = s.length() - 1;

83 if(s[last] == '/' || s[last] == '\\') {

84 s.erase(last);

85 }

87 if(std::find(search_paths.begin(), search_paths.end(), s) != search_paths.end()) {

88 return;

89 }

91 search_paths.push_back(s);

92 }

94 void register_theme(const char *name, Theme *theme)

95 {

96 if(!themes) {

97 themes = new ThemeMap;

98 }

100 Theme *prev = (*themes)[name];

101 if(prev) {

102 delete prev;

103 }

104 (*themes)[name] = theme;

105 }

106

107 Theme *get_theme(const char *name)

108 {

109 // first search in the already registered themes

110 ThemeMap::const_iterator it = themes->find(name);

111 if(it != themes->end()) {

112 return it->second;

113 }

114

115 // then try loading it from a theme plugin

116 Theme *theme = new Theme;

117 if(theme->load(name)) {

118 return theme;

119 }

120

121 fprintf(stderr, "[goatkit] theme \"%s\" not found!\n", name);

122 return 0;

123 }

124

125 Theme::Theme()

126 {

127 impl = new ThemeImpl;

128 impl->so = 0;

129 impl->lookup_theme_draw_func = 0;

130 }

131

132 Theme::Theme(const char *name, WidgetLookupFunc func)

133 {

134 impl = new ThemeImpl;

135 impl->so = 0;

136 impl->lookup_theme_draw_func = func;

137

138 register_theme(name, this);

139 }

140

141 Theme::~Theme()

142 {

143 unload();

144 delete impl;

145 }

146

147 typedef WidgetDrawFunc (*LookupFunc)(const char*);

148

149 bool Theme::load(const char *name)

150 {

151 unload();

152

153 std::string fname = std::string(name) + ".gtheme";

154 if(!(impl->so = dlopen(fname.c_str(), RTLD_LAZY))) {

155 for(size_t i=0; i<search_paths.size(); i++) {

156 std::string path = search_paths[i] + "/" + fname;

157

158 if((impl->so = dlopen(path.c_str(), RTLD_LAZY))) {

159 break;

160 }

161 }

162

163 // try the fallback paths

164 if(!impl->so) {

165 for(int i=0; fallback_paths[i]; i++) {

166 std::string path = std::string(fallback_paths[i]) + "/" + fname;

167

168 if((impl->so = dlopen(path.c_str(), RTLD_LAZY))) {

169 break;

170 }

171 }

172 }

173

174 if(!impl->so) {

175 fprintf(stderr, "%s: failed to load theme plugin: %s\n", __func__, name);

176 return false;

177 }

178 }

179

180 // loaded the shared object, now get the lookup function

181 impl->lookup_theme_draw_func = (LookupFunc)dlsym(impl->so, "get_widget_func");

182 if(!impl->lookup_theme_draw_func) {

183 fprintf(stderr, "%s: invalid theme plugin %s\n", __func__, name);

184 unload();

185 return false;

186 }

187

188 register_theme(name, this);

189 return true;

190 }

191

192 void Theme::unload()

193 {

194 if(impl->so) {

195 if(impl->so != RTLD_DEFAULT) {

196 dlclose(impl->so);

197 }

198 impl->so = 0;

199 }

200 impl->func_cache.clear();

201 }

202

203 WidgetDrawFunc Theme::get_draw_func(const char *type) const

204 {

205 std::map<std::string, WidgetDrawFunc>::const_iterator it = impl->func_cache.find(type);

206 if(it == impl->func_cache.end()) {

207 // don't have it cached, try to look it up

208 WidgetDrawFunc func;

209 if(impl->lookup_theme_draw_func && (func = impl->lookup_theme_draw_func(type))) {

210 impl->func_cache[type] = func;

211 return func;

212 }

213

214 // can't look it up, return the default

215 return default_draw_func;

216 }

217 return it->second;

218 }

219

220 #define LERP(a, b, t) ((a) + ((b) - (a)) * t)

221 #define DEF_TEX_SZ 32

222 void default_draw_func(const Widget *w)

223 {

224 static unsigned int tex;

225

226 if(!tex) {

227 unsigned char *pixels = new unsigned char[DEF_TEX_SZ * DEF_TEX_SZ * 3];

228 unsigned char *ptr = pixels;

229 for(int i=0; i<DEF_TEX_SZ; i++) {

230 for(int j=0; j<DEF_TEX_SZ; j++) {

231 bool stripe = (((j + i) / 8) & 1) == 1;

232 ptr[0] = ptr[1] = ptr[2] = stripe ? 255 : 0;

233 ptr += 3;

234 }

235 }

236

237 glGenTextures(1, &tex);

238 glBindTexture(GL_TEXTURE_2D, tex);

239 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

240 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

241 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, DEF_TEX_SZ, DEF_TEX_SZ, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);

242 delete [] pixels;

243 }

244

245 Vec2 pos = w->get_position();

246 Vec2 sz = w->get_size();

247 float aspect = sz.x / sz.y;

248

249 #if !defined(GL_ES_VERSION_2_0)

250 glPushAttrib(GL_ENABLE_BIT);

251 glEnable(GL_TEXTURE_2D);

252 #endif

253 glBindTexture(GL_TEXTURE_2D, tex);

254

255 float offs = w->get_pressed() * 0.1 * sz.y;

256 glMatrixMode(GL_MODELVIEW);

257 glPushMatrix();

258 glTranslatef(offs, -offs, 0);

259

260 float active = w->get_active();

261 float hover = w->get_under_mouse();

262

263 float rg = LERP(0.4, 1.0, hover);

264 float b = LERP(rg, 0, active);

265 glColor3f(rg, rg, b);

266

267 glBegin(GL_QUADS);

268 glTexCoord2f(0, 1);

269 glVertex2f(pos.x, pos.y);

270 glTexCoord2f(aspect, 1);

271 glVertex2f(pos.x + sz.x, pos.y);

272 glTexCoord2f(aspect, 0);

273 glVertex2f(pos.x + sz.x, pos.y + sz.y);

274 glTexCoord2f(0, 0);

275 glVertex2f(pos.x, pos.y + sz.y);

276 glEnd();

277

278 glPopMatrix();

279

280 #ifndef GL_ES_VERSION_2_0

281 glPopAttrib();

282 #endif

283 }

284

285 } // namespace goatkit

286

287 #ifdef WIN32

288 // XXX untested

289 static void *dlopen(const char *name, int flags)

290 {

291 return LoadLibrary(name);

292 }

293

294 static void dlclose(void *so)

295 {

296 FreeLibrary(so);

297 }

298

299 static void *dlsym(void *so, const char *symbol)

300 {

301 if(so == RTLD_DEFAULT) {

302 so = GetModuleHandle(0);

303 }

304 return (void*)GetProcAddress(so, symbol);

305 }

306 #endif