1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/goatkit/theme.cc	Wed Sep 23 05:44:58 2015 +0300
     1.3 @@ -0,0 +1,253 @@
     1.4 +/*
     1.5 +GoatKit - a themable/animated widget toolkit for games
     1.6 +Copyright (C) 2014  John Tsiombikas <nuclear@member.fsf.org>
     1.7 +
     1.8 +This program is free software: you can redistribute it and/or modify
     1.9 +it under the terms of the GNU Lesser General Public License as published by
    1.10 +the Free Software Foundation, either version 3 of the License, or
    1.11 +(at your option) any later version.
    1.12 +
    1.13 +This program is distributed in the hope that it will be useful,
    1.14 +but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.15 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.16 +GNU Lesser General Public License for more details.
    1.17 +
    1.18 +You should have received a copy of the GNU Lesser General Public License
    1.19 +along with this program.  If not, see <http://www.gnu.org/licenses/>.
    1.20 +*/
    1.21 +#include "config.h"
    1.22 +#include <stdio.h>
    1.23 +#include <vector>
    1.24 +#include <string>
    1.25 +#include <map>
    1.26 +#include <algorithm>
    1.27 +#include "theme.h"
    1.28 +#include "widget.h"
    1.29 +
    1.30 +#ifdef WIN32
    1.31 +#include <windows.h>
    1.32 +
    1.33 +static void *dlopen(const char *name, int flags);
    1.34 +static void dlclose(void *so);
    1.35 +static void *dlsym(void *so, const char *symbol);
    1.36 +#else
    1.37 +#include <unistd.h>
    1.38 +#include <dlfcn.h>
    1.39 +#endif
    1.40 +
    1.41 +#ifdef HAVE_OPENGL_H
    1.42 +#include "opengl.h"
    1.43 +
    1.44 +#else
    1.45 +
    1.46 +#ifdef __APPLE__
    1.47 +#include <OpenGL/gl.h>
    1.48 +#else
    1.49 +#include <GL/gl.h>
    1.50 +#endif
    1.51 +
    1.52 +#endif	/* HAVE_OPENGL_H_ */
    1.53 +
    1.54 +#ifndef PREFIX
    1.55 +#define PREFIX	"/usr/local"
    1.56 +#endif
    1.57 +
    1.58 +namespace goatkit {
    1.59 +
    1.60 +struct ThemeImpl {
    1.61 +	void *so;
    1.62 +	WidgetDrawFunc (*lookup_theme_draw_func)(const char*);
    1.63 +	mutable std::map<std::string, WidgetDrawFunc> func_cache;
    1.64 +};
    1.65 +
    1.66 +Theme *theme;
    1.67 +static std::vector<std::string> search_paths;
    1.68 +static const char *fallback_paths[] = {
    1.69 +	PREFIX "/share/goatkit",
    1.70 +	0
    1.71 +};
    1.72 +
    1.73 +void add_theme_path(const char *path)
    1.74 +{
    1.75 +	if(!path || !*path) return;
    1.76 +
    1.77 +	std::string s = path;
    1.78 +	int last = s.length() - 1;
    1.79 +	if(s[last] == '/' || s[last] == '\\') {
    1.80 +		s.erase(last);
    1.81 +	}
    1.82 +
    1.83 +	if(std::find(search_paths.begin(), search_paths.end(), s) != search_paths.end()) {
    1.84 +		return;
    1.85 +	}
    1.86 +
    1.87 +	search_paths.push_back(s);
    1.88 +}
    1.89 +
    1.90 +Theme::Theme()
    1.91 +{
    1.92 +	impl = new ThemeImpl;
    1.93 +	impl->so = 0;
    1.94 +	impl->lookup_theme_draw_func = 0;
    1.95 +}
    1.96 +
    1.97 +Theme::~Theme()
    1.98 +{
    1.99 +	unload();
   1.100 +	delete impl;
   1.101 +}
   1.102 +
   1.103 +typedef WidgetDrawFunc (*LookupFunc)(const char*);
   1.104 +
   1.105 +bool Theme::load(const char *name)
   1.106 +{
   1.107 +	unload();
   1.108 +
   1.109 +	std::string fname = std::string(name) + ".gtheme";
   1.110 +	if(!(impl->so = dlopen(fname.c_str(), RTLD_LAZY))) {
   1.111 +		for(size_t i=0; i<search_paths.size(); i++) {
   1.112 +			std::string path = search_paths[i] + "/" + fname;
   1.113 +
   1.114 +			if((impl->so = dlopen(path.c_str(), RTLD_LAZY))) {
   1.115 +				break;
   1.116 +			}
   1.117 +		}
   1.118 +
   1.119 +		// try the fallback paths
   1.120 +		if(!impl->so) {
   1.121 +			for(int i=0; fallback_paths[i]; i++) {
   1.122 +				std::string path = std::string(fallback_paths[i]) + "/" + fname;
   1.123 +
   1.124 +				if((impl->so = dlopen(path.c_str(), RTLD_LAZY))) {
   1.125 +					break;
   1.126 +				}
   1.127 +			}
   1.128 +		}
   1.129 +
   1.130 +		if(!impl->so) {
   1.131 +			fprintf(stderr, "%s: failed to load theme plugin: %s\n", __func__, name);
   1.132 +			return false;
   1.133 +		}
   1.134 +	}
   1.135 +
   1.136 +	// loaded the shared object, now get the lookup function
   1.137 +	impl->lookup_theme_draw_func = (LookupFunc)dlsym(impl->so, "get_widget_func");
   1.138 +	if(!impl->lookup_theme_draw_func) {
   1.139 +		fprintf(stderr, "%s: invalid theme plugin %s\n", __func__, name);
   1.140 +		unload();
   1.141 +		return false;
   1.142 +	}
   1.143 +
   1.144 +	return true;
   1.145 +}
   1.146 +
   1.147 +void Theme::unload()
   1.148 +{
   1.149 +	if(impl->so) {
   1.150 +		dlclose(impl->so);
   1.151 +		impl->so = 0;
   1.152 +	}
   1.153 +	impl->func_cache.clear();
   1.154 +}
   1.155 +
   1.156 +WidgetDrawFunc Theme::get_draw_func(const char *type) const
   1.157 +{
   1.158 +	std::map<std::string, WidgetDrawFunc>::const_iterator it = impl->func_cache.find(type);
   1.159 +	if(it == impl->func_cache.end()) {
   1.160 +		// don't have it cached, try to look it up
   1.161 +		WidgetDrawFunc func;
   1.162 +		if(impl->lookup_theme_draw_func && (func = impl->lookup_theme_draw_func(type))) {
   1.163 +			impl->func_cache[type] = func;
   1.164 +			return func;
   1.165 +		}
   1.166 +
   1.167 +		// can't look it up, return the default
   1.168 +		return default_draw_func;
   1.169 +	}
   1.170 +	return it->second;
   1.171 +}
   1.172 +
   1.173 +#define LERP(a, b, t)	((a) + ((b) - (a)) * t)
   1.174 +#define DEF_TEX_SZ	32
   1.175 +void default_draw_func(const Widget *w)
   1.176 +{
   1.177 +	static unsigned int tex;
   1.178 +
   1.179 +	if(!tex) {
   1.180 +		unsigned char *pixels = new unsigned char[DEF_TEX_SZ * DEF_TEX_SZ * 3];
   1.181 +		unsigned char *ptr = pixels;
   1.182 +		for(int i=0; i<DEF_TEX_SZ; i++) {
   1.183 +			for(int j=0; j<DEF_TEX_SZ; j++) {
   1.184 +				bool stripe = (((j + i) / 8) & 1) == 1;
   1.185 +				ptr[0] = ptr[1] = ptr[2] = stripe ? 255 : 0;
   1.186 +				ptr += 3;
   1.187 +			}
   1.188 +		}
   1.189 +
   1.190 +		glGenTextures(1, &tex);
   1.191 +		glBindTexture(GL_TEXTURE_2D, tex);
   1.192 +		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   1.193 +		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   1.194 +		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, DEF_TEX_SZ, DEF_TEX_SZ, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);
   1.195 +		delete [] pixels;
   1.196 +	}
   1.197 +
   1.198 +	Vec2 pos = w->get_position();
   1.199 +	Vec2 sz = w->get_size();
   1.200 +	float aspect = sz.x / sz.y;
   1.201 +
   1.202 +#if !defined(GL_ES_VERSION_2_0)
   1.203 +	glPushAttrib(GL_ENABLE_BIT);
   1.204 +	glEnable(GL_TEXTURE_2D);
   1.205 +#endif
   1.206 +	glBindTexture(GL_TEXTURE_2D, tex);
   1.207 +
   1.208 +	float offs = w->get_pressed() * 0.1 * sz.y;
   1.209 +	glMatrixMode(GL_MODELVIEW);
   1.210 +	glPushMatrix();
   1.211 +	glTranslatef(offs, -offs, 0);
   1.212 +
   1.213 +	float active = w->get_active();
   1.214 +	float hover = w->get_under_mouse();
   1.215 +
   1.216 +	float rg = LERP(0.4, 1.0, hover);
   1.217 +	float b = LERP(rg, 0, active);
   1.218 +	glColor3f(rg, rg, b);
   1.219 +
   1.220 +	glBegin(GL_QUADS);
   1.221 +	glTexCoord2f(0, 1);
   1.222 +	glVertex2f(pos.x, pos.y);
   1.223 +	glTexCoord2f(aspect, 1);
   1.224 +	glVertex2f(pos.x + sz.x, pos.y);
   1.225 +	glTexCoord2f(aspect, 0);
   1.226 +	glVertex2f(pos.x + sz.x, pos.y + sz.y);
   1.227 +	glTexCoord2f(0, 0);
   1.228 +	glVertex2f(pos.x, pos.y + sz.y);
   1.229 +	glEnd();
   1.230 +
   1.231 +	glPopMatrix();
   1.232 +
   1.233 +#ifndef GL_ES_VERSION_2_0
   1.234 +	glPopAttrib();
   1.235 +#endif
   1.236 +}
   1.237 +
   1.238 +}	// namespace goatkit
   1.239 +
   1.240 +#ifdef WIN32
   1.241 +// XXX untested
   1.242 +static void *dlopen(const char *name, int flags)
   1.243 +{
   1.244 +	return LoadLibrary(name);
   1.245 +}
   1.246 +
   1.247 +static void dlclose(void *so)
   1.248 +{
   1.249 +	FreeLibrary(so);
   1.250 +}
   1.251 +
   1.252 +static void *dlsym(void *so, const char *symbol)
   1.253 +{
   1.254 +	return (void*)GetProcAddress(so, symbol);
   1.255 +}
   1.256 +#endif