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annotate libs/goatkit/theme.cc @ 9:64e15874f3bd

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author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 26 Sep 2015 02:56:07 +0300
parents a3c4fcc9f8f3
children 03cc3b1884d1
rev   line source
nuclear@6 1 /*
nuclear@6 2 GoatKit - a themable/animated widget toolkit for games
nuclear@9 3 Copyright (C) 2014-2015 John Tsiombikas <nuclear@member.fsf.org>
nuclear@6 4
nuclear@6 5 This program is free software: you can redistribute it and/or modify
nuclear@6 6 it under the terms of the GNU Lesser General Public License as published by
nuclear@6 7 the Free Software Foundation, either version 3 of the License, or
nuclear@6 8 (at your option) any later version.
nuclear@6 9
nuclear@6 10 This program is distributed in the hope that it will be useful,
nuclear@6 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@6 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@6 13 GNU Lesser General Public License for more details.
nuclear@6 14
nuclear@6 15 You should have received a copy of the GNU Lesser General Public License
nuclear@6 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@6 17 */
nuclear@6 18 #include "config.h"
nuclear@6 19 #include <stdio.h>
nuclear@6 20 #include <vector>
nuclear@6 21 #include <string>
nuclear@6 22 #include <map>
nuclear@6 23 #include <algorithm>
nuclear@9 24 #include <string.h>
nuclear@6 25 #include "theme.h"
nuclear@6 26 #include "widget.h"
nuclear@6 27
nuclear@6 28 #ifdef WIN32
nuclear@6 29 #include <windows.h>
nuclear@6 30
nuclear@9 31 #define RTLD_DEFAULT ((void*)0)
nuclear@9 32
nuclear@6 33 static void *dlopen(const char *name, int flags);
nuclear@6 34 static void dlclose(void *so);
nuclear@6 35 static void *dlsym(void *so, const char *symbol);
nuclear@6 36 #else
nuclear@6 37 #include <unistd.h>
nuclear@6 38 #include <dlfcn.h>
nuclear@6 39 #endif
nuclear@6 40
nuclear@6 41 #ifdef HAVE_OPENGL_H
nuclear@6 42 #include "opengl.h"
nuclear@6 43
nuclear@6 44 #else
nuclear@6 45
nuclear@6 46 #ifdef __APPLE__
nuclear@6 47 #include <OpenGL/gl.h>
nuclear@6 48 #else
nuclear@6 49 #include <GL/gl.h>
nuclear@6 50 #endif
nuclear@6 51
nuclear@6 52 #endif /* HAVE_OPENGL_H_ */
nuclear@6 53
nuclear@6 54 #ifndef PREFIX
nuclear@6 55 #define PREFIX "/usr/local"
nuclear@6 56 #endif
nuclear@6 57
nuclear@6 58 namespace goatkit {
nuclear@6 59
nuclear@6 60 struct ThemeImpl {
nuclear@6 61 void *so;
nuclear@6 62 WidgetDrawFunc (*lookup_theme_draw_func)(const char*);
nuclear@6 63 mutable std::map<std::string, WidgetDrawFunc> func_cache;
nuclear@6 64 };
nuclear@6 65
nuclear@6 66 Theme *theme;
nuclear@6 67 static std::vector<std::string> search_paths;
nuclear@6 68 static const char *fallback_paths[] = {
nuclear@6 69 PREFIX "/share/goatkit",
nuclear@6 70 0
nuclear@6 71 };
nuclear@6 72
nuclear@6 73 void add_theme_path(const char *path)
nuclear@6 74 {
nuclear@6 75 if(!path || !*path) return;
nuclear@6 76
nuclear@6 77 std::string s = path;
nuclear@6 78 int last = s.length() - 1;
nuclear@6 79 if(s[last] == '/' || s[last] == '\\') {
nuclear@6 80 s.erase(last);
nuclear@6 81 }
nuclear@6 82
nuclear@6 83 if(std::find(search_paths.begin(), search_paths.end(), s) != search_paths.end()) {
nuclear@6 84 return;
nuclear@6 85 }
nuclear@6 86
nuclear@6 87 search_paths.push_back(s);
nuclear@6 88 }
nuclear@6 89
nuclear@6 90 Theme::Theme()
nuclear@6 91 {
nuclear@6 92 impl = new ThemeImpl;
nuclear@6 93 impl->so = 0;
nuclear@6 94 impl->lookup_theme_draw_func = 0;
nuclear@6 95 }
nuclear@6 96
nuclear@6 97 Theme::~Theme()
nuclear@6 98 {
nuclear@6 99 unload();
nuclear@6 100 delete impl;
nuclear@6 101 }
nuclear@6 102
nuclear@6 103 typedef WidgetDrawFunc (*LookupFunc)(const char*);
nuclear@6 104
nuclear@6 105 bool Theme::load(const char *name)
nuclear@6 106 {
nuclear@6 107 unload();
nuclear@6 108
nuclear@7 109 if(strcmp(name, "GOATKIT_THEME_BUILTIN") == 0) {
nuclear@7 110 impl->so = RTLD_DEFAULT;
nuclear@7 111 } else {
nuclear@7 112 std::string fname = std::string(name) + ".gtheme";
nuclear@7 113 if(!(impl->so = dlopen(fname.c_str(), RTLD_LAZY))) {
nuclear@7 114 for(size_t i=0; i<search_paths.size(); i++) {
nuclear@7 115 std::string path = search_paths[i] + "/" + fname;
nuclear@6 116
nuclear@6 117 if((impl->so = dlopen(path.c_str(), RTLD_LAZY))) {
nuclear@6 118 break;
nuclear@6 119 }
nuclear@6 120 }
nuclear@6 121
nuclear@7 122 // try the fallback paths
nuclear@7 123 if(!impl->so) {
nuclear@7 124 for(int i=0; fallback_paths[i]; i++) {
nuclear@7 125 std::string path = std::string(fallback_paths[i]) + "/" + fname;
nuclear@7 126
nuclear@7 127 if((impl->so = dlopen(path.c_str(), RTLD_LAZY))) {
nuclear@7 128 break;
nuclear@7 129 }
nuclear@7 130 }
nuclear@7 131 }
nuclear@7 132
nuclear@7 133 if(!impl->so) {
nuclear@7 134 fprintf(stderr, "%s: failed to load theme plugin: %s\n", __func__, name);
nuclear@7 135 return false;
nuclear@7 136 }
nuclear@6 137 }
nuclear@6 138 }
nuclear@6 139
nuclear@6 140 // loaded the shared object, now get the lookup function
nuclear@6 141 impl->lookup_theme_draw_func = (LookupFunc)dlsym(impl->so, "get_widget_func");
nuclear@6 142 if(!impl->lookup_theme_draw_func) {
nuclear@6 143 fprintf(stderr, "%s: invalid theme plugin %s\n", __func__, name);
nuclear@6 144 unload();
nuclear@6 145 return false;
nuclear@6 146 }
nuclear@6 147
nuclear@6 148 return true;
nuclear@6 149 }
nuclear@6 150
nuclear@6 151 void Theme::unload()
nuclear@6 152 {
nuclear@6 153 if(impl->so) {
nuclear@7 154 if(impl->so != RTLD_DEFAULT) {
nuclear@7 155 dlclose(impl->so);
nuclear@7 156 }
nuclear@6 157 impl->so = 0;
nuclear@6 158 }
nuclear@6 159 impl->func_cache.clear();
nuclear@6 160 }
nuclear@6 161
nuclear@6 162 WidgetDrawFunc Theme::get_draw_func(const char *type) const
nuclear@6 163 {
nuclear@6 164 std::map<std::string, WidgetDrawFunc>::const_iterator it = impl->func_cache.find(type);
nuclear@6 165 if(it == impl->func_cache.end()) {
nuclear@6 166 // don't have it cached, try to look it up
nuclear@6 167 WidgetDrawFunc func;
nuclear@6 168 if(impl->lookup_theme_draw_func && (func = impl->lookup_theme_draw_func(type))) {
nuclear@6 169 impl->func_cache[type] = func;
nuclear@6 170 return func;
nuclear@6 171 }
nuclear@6 172
nuclear@6 173 // can't look it up, return the default
nuclear@6 174 return default_draw_func;
nuclear@6 175 }
nuclear@6 176 return it->second;
nuclear@6 177 }
nuclear@6 178
nuclear@6 179 #define LERP(a, b, t) ((a) + ((b) - (a)) * t)
nuclear@6 180 #define DEF_TEX_SZ 32
nuclear@6 181 void default_draw_func(const Widget *w)
nuclear@6 182 {
nuclear@6 183 static unsigned int tex;
nuclear@6 184
nuclear@6 185 if(!tex) {
nuclear@6 186 unsigned char *pixels = new unsigned char[DEF_TEX_SZ * DEF_TEX_SZ * 3];
nuclear@6 187 unsigned char *ptr = pixels;
nuclear@6 188 for(int i=0; i<DEF_TEX_SZ; i++) {
nuclear@6 189 for(int j=0; j<DEF_TEX_SZ; j++) {
nuclear@6 190 bool stripe = (((j + i) / 8) & 1) == 1;
nuclear@6 191 ptr[0] = ptr[1] = ptr[2] = stripe ? 255 : 0;
nuclear@6 192 ptr += 3;
nuclear@6 193 }
nuclear@6 194 }
nuclear@6 195
nuclear@6 196 glGenTextures(1, &tex);
nuclear@6 197 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@6 198 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@6 199 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@6 200 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, DEF_TEX_SZ, DEF_TEX_SZ, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);
nuclear@6 201 delete [] pixels;
nuclear@6 202 }
nuclear@6 203
nuclear@6 204 Vec2 pos = w->get_position();
nuclear@6 205 Vec2 sz = w->get_size();
nuclear@6 206 float aspect = sz.x / sz.y;
nuclear@6 207
nuclear@6 208 #if !defined(GL_ES_VERSION_2_0)
nuclear@6 209 glPushAttrib(GL_ENABLE_BIT);
nuclear@6 210 glEnable(GL_TEXTURE_2D);
nuclear@6 211 #endif
nuclear@6 212 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@6 213
nuclear@6 214 float offs = w->get_pressed() * 0.1 * sz.y;
nuclear@6 215 glMatrixMode(GL_MODELVIEW);
nuclear@6 216 glPushMatrix();
nuclear@6 217 glTranslatef(offs, -offs, 0);
nuclear@6 218
nuclear@6 219 float active = w->get_active();
nuclear@6 220 float hover = w->get_under_mouse();
nuclear@6 221
nuclear@6 222 float rg = LERP(0.4, 1.0, hover);
nuclear@6 223 float b = LERP(rg, 0, active);
nuclear@6 224 glColor3f(rg, rg, b);
nuclear@6 225
nuclear@6 226 glBegin(GL_QUADS);
nuclear@6 227 glTexCoord2f(0, 1);
nuclear@6 228 glVertex2f(pos.x, pos.y);
nuclear@6 229 glTexCoord2f(aspect, 1);
nuclear@6 230 glVertex2f(pos.x + sz.x, pos.y);
nuclear@6 231 glTexCoord2f(aspect, 0);
nuclear@6 232 glVertex2f(pos.x + sz.x, pos.y + sz.y);
nuclear@6 233 glTexCoord2f(0, 0);
nuclear@6 234 glVertex2f(pos.x, pos.y + sz.y);
nuclear@6 235 glEnd();
nuclear@6 236
nuclear@6 237 glPopMatrix();
nuclear@6 238
nuclear@6 239 #ifndef GL_ES_VERSION_2_0
nuclear@6 240 glPopAttrib();
nuclear@6 241 #endif
nuclear@6 242 }
nuclear@6 243
nuclear@6 244 } // namespace goatkit
nuclear@6 245
nuclear@6 246 #ifdef WIN32
nuclear@6 247 // XXX untested
nuclear@6 248 static void *dlopen(const char *name, int flags)
nuclear@6 249 {
nuclear@6 250 return LoadLibrary(name);
nuclear@6 251 }
nuclear@6 252
nuclear@6 253 static void dlclose(void *so)
nuclear@6 254 {
nuclear@6 255 FreeLibrary(so);
nuclear@6 256 }
nuclear@6 257
nuclear@6 258 static void *dlsym(void *so, const char *symbol)
nuclear@6 259 {
nuclear@7 260 if(so == RTLD_DEFAULT) {
nuclear@7 261 so = GetModuleHandle(0);
nuclear@7 262 }
nuclear@6 263 return (void*)GetProcAddress(so, symbol);
nuclear@6 264 }
nuclear@6 265 #endif