nuclear@6: /*
nuclear@6: GoatKit - a themable/animated widget toolkit for games
nuclear@6: Copyright (C) 2014  John Tsiombikas <nuclear@member.fsf.org>
nuclear@6: 
nuclear@6: This program is free software: you can redistribute it and/or modify
nuclear@6: it under the terms of the GNU Lesser General Public License as published by
nuclear@6: the Free Software Foundation, either version 3 of the License, or
nuclear@6: (at your option) any later version.
nuclear@6: 
nuclear@6: This program is distributed in the hope that it will be useful,
nuclear@6: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@6: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@6: GNU Lesser General Public License for more details.
nuclear@6: 
nuclear@6: You should have received a copy of the GNU Lesser General Public License
nuclear@6: along with this program.  If not, see <http://www.gnu.org/licenses/>.
nuclear@6: */
nuclear@6: #include "config.h"
nuclear@6: #include <stdio.h>
nuclear@6: #include <vector>
nuclear@6: #include <string>
nuclear@6: #include <map>
nuclear@6: #include <algorithm>
nuclear@6: #include "theme.h"
nuclear@6: #include "widget.h"
nuclear@6: 
nuclear@6: #ifdef WIN32
nuclear@6: #include <windows.h>
nuclear@6: 
nuclear@6: static void *dlopen(const char *name, int flags);
nuclear@6: static void dlclose(void *so);
nuclear@6: static void *dlsym(void *so, const char *symbol);
nuclear@6: #else
nuclear@6: #include <unistd.h>
nuclear@6: #include <dlfcn.h>
nuclear@6: #endif
nuclear@6: 
nuclear@6: #ifdef HAVE_OPENGL_H
nuclear@6: #include "opengl.h"
nuclear@6: 
nuclear@6: #else
nuclear@6: 
nuclear@6: #ifdef __APPLE__
nuclear@6: #include <OpenGL/gl.h>
nuclear@6: #else
nuclear@6: #include <GL/gl.h>
nuclear@6: #endif
nuclear@6: 
nuclear@6: #endif	/* HAVE_OPENGL_H_ */
nuclear@6: 
nuclear@6: #ifndef PREFIX
nuclear@6: #define PREFIX	"/usr/local"
nuclear@6: #endif
nuclear@6: 
nuclear@6: namespace goatkit {
nuclear@6: 
nuclear@6: struct ThemeImpl {
nuclear@6: 	void *so;
nuclear@6: 	WidgetDrawFunc (*lookup_theme_draw_func)(const char*);
nuclear@6: 	mutable std::map<std::string, WidgetDrawFunc> func_cache;
nuclear@6: };
nuclear@6: 
nuclear@6: Theme *theme;
nuclear@6: static std::vector<std::string> search_paths;
nuclear@6: static const char *fallback_paths[] = {
nuclear@6: 	PREFIX "/share/goatkit",
nuclear@6: 	0
nuclear@6: };
nuclear@6: 
nuclear@6: void add_theme_path(const char *path)
nuclear@6: {
nuclear@6: 	if(!path || !*path) return;
nuclear@6: 
nuclear@6: 	std::string s = path;
nuclear@6: 	int last = s.length() - 1;
nuclear@6: 	if(s[last] == '/' || s[last] == '\\') {
nuclear@6: 		s.erase(last);
nuclear@6: 	}
nuclear@6: 
nuclear@6: 	if(std::find(search_paths.begin(), search_paths.end(), s) != search_paths.end()) {
nuclear@6: 		return;
nuclear@6: 	}
nuclear@6: 
nuclear@6: 	search_paths.push_back(s);
nuclear@6: }
nuclear@6: 
nuclear@6: Theme::Theme()
nuclear@6: {
nuclear@6: 	impl = new ThemeImpl;
nuclear@6: 	impl->so = 0;
nuclear@6: 	impl->lookup_theme_draw_func = 0;
nuclear@6: }
nuclear@6: 
nuclear@6: Theme::~Theme()
nuclear@6: {
nuclear@6: 	unload();
nuclear@6: 	delete impl;
nuclear@6: }
nuclear@6: 
nuclear@6: typedef WidgetDrawFunc (*LookupFunc)(const char*);
nuclear@6: 
nuclear@6: bool Theme::load(const char *name)
nuclear@6: {
nuclear@6: 	unload();
nuclear@6: 
nuclear@6: 	std::string fname = std::string(name) + ".gtheme";
nuclear@6: 	if(!(impl->so = dlopen(fname.c_str(), RTLD_LAZY))) {
nuclear@6: 		for(size_t i=0; i<search_paths.size(); i++) {
nuclear@6: 			std::string path = search_paths[i] + "/" + fname;
nuclear@6: 
nuclear@6: 			if((impl->so = dlopen(path.c_str(), RTLD_LAZY))) {
nuclear@6: 				break;
nuclear@6: 			}
nuclear@6: 		}
nuclear@6: 
nuclear@6: 		// try the fallback paths
nuclear@6: 		if(!impl->so) {
nuclear@6: 			for(int i=0; fallback_paths[i]; i++) {
nuclear@6: 				std::string path = std::string(fallback_paths[i]) + "/" + fname;
nuclear@6: 
nuclear@6: 				if((impl->so = dlopen(path.c_str(), RTLD_LAZY))) {
nuclear@6: 					break;
nuclear@6: 				}
nuclear@6: 			}
nuclear@6: 		}
nuclear@6: 
nuclear@6: 		if(!impl->so) {
nuclear@6: 			fprintf(stderr, "%s: failed to load theme plugin: %s\n", __func__, name);
nuclear@6: 			return false;
nuclear@6: 		}
nuclear@6: 	}
nuclear@6: 
nuclear@6: 	// loaded the shared object, now get the lookup function
nuclear@6: 	impl->lookup_theme_draw_func = (LookupFunc)dlsym(impl->so, "get_widget_func");
nuclear@6: 	if(!impl->lookup_theme_draw_func) {
nuclear@6: 		fprintf(stderr, "%s: invalid theme plugin %s\n", __func__, name);
nuclear@6: 		unload();
nuclear@6: 		return false;
nuclear@6: 	}
nuclear@6: 
nuclear@6: 	return true;
nuclear@6: }
nuclear@6: 
nuclear@6: void Theme::unload()
nuclear@6: {
nuclear@6: 	if(impl->so) {
nuclear@6: 		dlclose(impl->so);
nuclear@6: 		impl->so = 0;
nuclear@6: 	}
nuclear@6: 	impl->func_cache.clear();
nuclear@6: }
nuclear@6: 
nuclear@6: WidgetDrawFunc Theme::get_draw_func(const char *type) const
nuclear@6: {
nuclear@6: 	std::map<std::string, WidgetDrawFunc>::const_iterator it = impl->func_cache.find(type);
nuclear@6: 	if(it == impl->func_cache.end()) {
nuclear@6: 		// don't have it cached, try to look it up
nuclear@6: 		WidgetDrawFunc func;
nuclear@6: 		if(impl->lookup_theme_draw_func && (func = impl->lookup_theme_draw_func(type))) {
nuclear@6: 			impl->func_cache[type] = func;
nuclear@6: 			return func;
nuclear@6: 		}
nuclear@6: 
nuclear@6: 		// can't look it up, return the default
nuclear@6: 		return default_draw_func;
nuclear@6: 	}
nuclear@6: 	return it->second;
nuclear@6: }
nuclear@6: 
nuclear@6: #define LERP(a, b, t)	((a) + ((b) - (a)) * t)
nuclear@6: #define DEF_TEX_SZ	32
nuclear@6: void default_draw_func(const Widget *w)
nuclear@6: {
nuclear@6: 	static unsigned int tex;
nuclear@6: 
nuclear@6: 	if(!tex) {
nuclear@6: 		unsigned char *pixels = new unsigned char[DEF_TEX_SZ * DEF_TEX_SZ * 3];
nuclear@6: 		unsigned char *ptr = pixels;
nuclear@6: 		for(int i=0; i<DEF_TEX_SZ; i++) {
nuclear@6: 			for(int j=0; j<DEF_TEX_SZ; j++) {
nuclear@6: 				bool stripe = (((j + i) / 8) & 1) == 1;
nuclear@6: 				ptr[0] = ptr[1] = ptr[2] = stripe ? 255 : 0;
nuclear@6: 				ptr += 3;
nuclear@6: 			}
nuclear@6: 		}
nuclear@6: 
nuclear@6: 		glGenTextures(1, &tex);
nuclear@6: 		glBindTexture(GL_TEXTURE_2D, tex);
nuclear@6: 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@6: 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@6: 		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, DEF_TEX_SZ, DEF_TEX_SZ, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);
nuclear@6: 		delete [] pixels;
nuclear@6: 	}
nuclear@6: 
nuclear@6: 	Vec2 pos = w->get_position();
nuclear@6: 	Vec2 sz = w->get_size();
nuclear@6: 	float aspect = sz.x / sz.y;
nuclear@6: 
nuclear@6: #if !defined(GL_ES_VERSION_2_0)
nuclear@6: 	glPushAttrib(GL_ENABLE_BIT);
nuclear@6: 	glEnable(GL_TEXTURE_2D);
nuclear@6: #endif
nuclear@6: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@6: 
nuclear@6: 	float offs = w->get_pressed() * 0.1 * sz.y;
nuclear@6: 	glMatrixMode(GL_MODELVIEW);
nuclear@6: 	glPushMatrix();
nuclear@6: 	glTranslatef(offs, -offs, 0);
nuclear@6: 
nuclear@6: 	float active = w->get_active();
nuclear@6: 	float hover = w->get_under_mouse();
nuclear@6: 
nuclear@6: 	float rg = LERP(0.4, 1.0, hover);
nuclear@6: 	float b = LERP(rg, 0, active);
nuclear@6: 	glColor3f(rg, rg, b);
nuclear@6: 
nuclear@6: 	glBegin(GL_QUADS);
nuclear@6: 	glTexCoord2f(0, 1);
nuclear@6: 	glVertex2f(pos.x, pos.y);
nuclear@6: 	glTexCoord2f(aspect, 1);
nuclear@6: 	glVertex2f(pos.x + sz.x, pos.y);
nuclear@6: 	glTexCoord2f(aspect, 0);
nuclear@6: 	glVertex2f(pos.x + sz.x, pos.y + sz.y);
nuclear@6: 	glTexCoord2f(0, 0);
nuclear@6: 	glVertex2f(pos.x, pos.y + sz.y);
nuclear@6: 	glEnd();
nuclear@6: 
nuclear@6: 	glPopMatrix();
nuclear@6: 
nuclear@6: #ifndef GL_ES_VERSION_2_0
nuclear@6: 	glPopAttrib();
nuclear@6: #endif
nuclear@6: }
nuclear@6: 
nuclear@6: }	// namespace goatkit
nuclear@6: 
nuclear@6: #ifdef WIN32
nuclear@6: // XXX untested
nuclear@6: static void *dlopen(const char *name, int flags)
nuclear@6: {
nuclear@6: 	return LoadLibrary(name);
nuclear@6: }
nuclear@6: 
nuclear@6: static void dlclose(void *so)
nuclear@6: {
nuclear@6: 	FreeLibrary(so);
nuclear@6: }
nuclear@6: 
nuclear@6: static void *dlsym(void *so, const char *symbol)
nuclear@6: {
nuclear@6: 	return (void*)GetProcAddress(so, symbol);
nuclear@6: }
nuclear@6: #endif