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vsgl2.cpp
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vsgl2.cpp
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/*
Copyright (C) 2016 Alessandro Bugatti (alessandro.bugatti@istruzione.it)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <iostream>
#include <map>
#include "version.h"
#include "vsgl2.h"
using namespace std;
using namespace AutoVersion;
namespace vsgl2
{
const int NUMBER_OF_CHANNELS = 16;
struct vsgl2_image
{
SDL_Texture *texture;
uint8_t alpha;
};
SDL_Window *window;
int width,height; //window size
SDL_Renderer *renderer;
bool isDone = false;
map<string, vsgl2_image> images;
map<string, TTF_Font*> fonts;
map<string, Mix_Chunk*> sounds;
const Uint8* currentKeyStates;
int mouseX, mouseY, mouseWheelX, mouseWheelY;
Mix_Music *music;
Color background_color;
//Variables for setting the drawing style of
//the geometrical primitives (draw_line etc.)
//in order to obtain persistence, e.g. each
//figure remains on the screen without
//having to redraw it at each cycle of the main loop
bool pixel_mode = false;
SDL_Texture *canvas;
namespace general
{
void init()
{
SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO);
//Set the default background color to white
background_color = Color(255,255,255,255);
SDL_Log("SDL init OK!");
if (!(IMG_Init(IMG_INIT_JPG | IMG_INIT_PNG) & (IMG_INIT_JPG | IMG_INIT_PNG)))
SDL_Log("Image subsystem inizialitation error.");
else
SDL_Log("SDL image OK!");
if (TTF_Init() == -1)
SDL_Log("TTF subsystem inizialitation error.");
else
SDL_Log("SDL TTF OK!");
if( Mix_OpenAudio( 44100, MIX_DEFAULT_FORMAT, 2, 2048 ) < 0 )
SDL_Log("SDL_mixer subsystem inizialitation error. SDL_mixer Error: %s\n",
Mix_GetError() );
else
SDL_Log("SDL_mixer OK!");
Mix_AllocateChannels(NUMBER_OF_CHANNELS);
SDL_Log("VSGL2 version: %s Build %ld",
AutoVersion::FULLVERSION_STRING,
AutoVersion::BUILDS_COUNT);
SDL_version compiled;
SDL_version linked;
SDL_VERSION(&compiled);
SDL_GetVersion(&linked);
SDL_Log("Built upon SDL2 version:\ncompiled %d.%d.%d\nlinked %d.%d.%d\n",
compiled.major, compiled.minor, compiled.patch,
linked.major, linked.minor, linked.patch);
}
void set_pixel_mode()
{
pixel_mode = true;
}
void unset_pixel_mode()
{
pixel_mode = false;
}
void close()
{
SDL_Log("Quitting SDL...");
//Free loaded image
for (auto const& i: images)
SDL_DestroyTexture( i.second.texture);
//Free loaded sounds
for (auto const& i: sounds)
Mix_FreeChunk(i.second);
//Free loaded fonts
for (auto const& i: fonts)
TTF_CloseFont(i.second);
//Destroy window
SDL_DestroyRenderer( renderer );
SDL_DestroyWindow( window );
//Free resources
if (music != NULL)
Mix_FreeMusic( music );
//Quit various subsystems
IMG_Quit();
Mix_Quit();
SDL_Log("Done.");
SDL_Quit();
}
void set_window(int w, int h, string title, int fullscreen)
{
if (fullscreen == 1)
fullscreen = SDL_WINDOW_FULLSCREEN;
window = SDL_CreateWindow(
title.c_str(), // window title
SDL_WINDOWPOS_UNDEFINED, // initial x position
SDL_WINDOWPOS_UNDEFINED, // initial y position
w, // width, in pixels
h, // height, in pixels
SDL_WINDOW_OPENGL | fullscreen // flags
);
if (window == NULL)
{
// In the case that the window could not be made...
SDL_LogCritical(SDL_LOG_CATEGORY_VIDEO, "Could not create window: %s", SDL_GetError());
exit(1);
}
width = w;
height = h;
renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_SOFTWARE);
SDL_SetRenderDrawColor(renderer, background_color.c.r,
background_color.c.g,
background_color.c.b,
background_color.c.a);
SDL_RenderClear(renderer);
SDL_SetRenderDrawBlendMode(renderer,SDL_BLENDMODE_BLEND);
if (pixel_mode){
canvas = SDL_CreateTexture(renderer,SDL_PIXELFORMAT_ARGB8888,
SDL_TEXTUREACCESS_TARGET, width, height);
SDL_SetTextureBlendMode( canvas, SDL_BLENDMODE_BLEND );
SDL_SetTextureAlphaMod( canvas, 127);
}
}
void set_background_color(const Color& bg)
{
background_color = bg;
SDL_SetRenderDrawColor(renderer, background_color.c.r,
background_color.c.g,
background_color.c.b,
background_color.c.a);
SDL_RenderClear(renderer);
}
int get_window_width()
{
return width;
}
int get_window_height()
{
return height;
}
}
namespace video
{
bool done()
{
if (!pixel_mode) SDL_RenderClear(renderer);
return isDone;
}
void undone()
{
isDone = false;
}
void update()
{
SDL_Event e;
//Needed to avoid that the wheel value
//would stay to -1 or 1 after scrolling
mouseWheelX = 0;
mouseWheelY = 0;
while ( SDL_PollEvent(&e) )
{
if (e.type == SDL_QUIT)
isDone = true;
else if (e.type == SDL_KEYUP && e.key.keysym.sym == SDLK_ESCAPE)
isDone = true;
if( e.type == SDL_MOUSEMOTION ||
e.type == SDL_MOUSEBUTTONDOWN ||
e.type == SDL_MOUSEBUTTONUP )
SDL_GetMouseState( &mouseX, &mouseY );
if( e.type == SDL_MOUSEWHEEL)
{
mouseWheelX = e.wheel.x;
mouseWheelY = e.wheel.y;
};
}
SDL_RenderPresent(renderer);
}
void draw_point(int x, int y, const Color& c)
{
Uint8 r, g, b, a;
SDL_GetRenderDrawColor(renderer, &r, &g, &b, &a);
SDL_SetRenderDrawColor(renderer, c.c.r, c.c.g, c.c.b, c.c.a);
if (pixel_mode){
SDL_SetRenderTarget(renderer, canvas);
}
SDL_RenderDrawPoint(renderer, x, y);
if (pixel_mode){
SDL_Rect r;
r.x= 0;
r.y = 0;
r.w = width;
r.h = height;
SDL_SetRenderTarget(renderer, NULL);
SDL_RenderCopy(renderer, canvas, NULL, &r);
}
SDL_SetRenderDrawColor(renderer, r, g, b, a);
}
void draw_rect(int x, int y, int w, int h, const Color& c)
{
Uint8 r, g, b, a;
SDL_GetRenderDrawColor(renderer, &r, &g, &b, &a);
SDL_SetRenderDrawColor(renderer, c.c.r, c.c.g, c.c.b, c.c.a);
SDL_Rect rectangle;
rectangle.x = x;
rectangle.y = y;
rectangle.w = w;
rectangle.h = h;
if (pixel_mode){
SDL_SetRenderTarget(renderer, canvas);
}
SDL_RenderDrawRect(renderer, &rectangle);
SDL_SetRenderDrawColor(renderer, r, g, b, a);
if (pixel_mode){
SDL_Rect r;
r.x= 0;
r.y = 0;
r.w = width;
r.h = height;
SDL_SetRenderTarget(renderer, NULL);
SDL_RenderCopy(renderer, canvas, NULL, &r);
}
}
void draw_filled_rect(int x, int y, int w, int h, const Color& c)
{
Uint8 r, g, b, a;
SDL_GetRenderDrawColor(renderer, &r, &g, &b, &a);
SDL_SetRenderDrawColor(renderer, c.c.r, c.c.g, c.c.b, c.c.a);
SDL_Rect rectangle;
rectangle.x = x;
rectangle.y = y;
rectangle.w = w;
rectangle.h = h;
if (pixel_mode){
SDL_SetRenderTarget(renderer, canvas);
}
SDL_RenderFillRect(renderer, &rectangle);
if (pixel_mode){
SDL_Rect r;
r.x= 0;
r.y = 0;
r.w = width;
r.h = height;
SDL_SetRenderTarget(renderer, NULL);
SDL_RenderCopy(renderer, canvas, NULL, &r);
}
SDL_SetRenderDrawColor(renderer, r, g, b, a);
}
void draw_line(int x1, int y1, int x2, int y2, const Color& c)
{
Uint8 r, g, b, a;
SDL_GetRenderDrawColor(renderer, &r, &g, &b, &a);
SDL_SetRenderDrawColor(renderer, c.c.r, c.c.g, c.c.b, c.c.a);
SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
SDL_SetRenderDrawColor(renderer, r, g, b, a);
}
void draw_image(string image, int x, int y, int w, int h, uint8_t alpha)
{
if (images.find(image)==images.end())
{
SDL_Surface* s = IMG_Load(image.c_str());
if (s == NULL)
SDL_Log("Caricamento immagine fallito: %s", SDL_GetError() );
else
{
SDL_Texture * texture = SDL_CreateTextureFromSurface( renderer, s);
vsgl2_image im;
im.texture = texture;
im.alpha = alpha;
images.insert(make_pair(image,im));
SDL_FreeSurface(s);
}
}
SDL_Rect r;
r.x= x;
r.y = y;
r.w = w;
r.h = h;
SDL_SetTextureBlendMode( images[image].texture, SDL_BLENDMODE_BLEND );
SDL_SetTextureAlphaMod( images[image].texture, alpha);
SDL_RenderCopy(renderer, images[image].texture,NULL,&r);
}
}//closing namespace video
namespace audio
{
void play_music(string file)
{
if (Mix_PausedMusic() == 1)
{
Mix_ResumeMusic();
return;
}
if (music != NULL)
Mix_FreeMusic(music);
music = Mix_LoadMUS(file.c_str());
if( music == NULL )
SDL_Log( "Failed to load music! SDL_mixer Error: %s\n",
Mix_GetError() );
else
Mix_PlayMusic(music, -1);
}
void pause_music()
{
if( Mix_PlayingMusic() == 0 )
return;
Mix_PauseMusic();
}
void stop_music()
{
Mix_PlayMusic(music, -1);
Mix_HaltMusic();
}
void play_sound(string sound)
{
if (sounds.find(sound)==sounds.end())
{
Mix_Chunk* s = Mix_LoadWAV(sound.c_str());
if( s == NULL )
SDL_Log("Failed to load sound effect! SDL_mixer Error: %s\n", Mix_GetError());
else
sounds.insert(make_pair(sound,s));
}
Mix_PlayChannel( -1, sounds[sound], 0 );
}
}//closing namespace audio
namespace io
{
bool is_pressed(int key)
{
currentKeyStates = SDL_GetKeyboardState( NULL );
return (bool)currentKeyStates[key];
}
string read_text(string font, int dim, int x, int y, Color c, uint8_t max_length)
{
std::string inputText;
SDL_Event e;
bool done = false;
SDL_Surface *screen = SDL_GetWindowSurface(window);
SDL_Rect r;
r.x= 0;
r.y = 0;
r.w = width;
r.h = height;
SDL_Texture *texture =
SDL_CreateTextureFromSurface(renderer, screen);
SDL_FreeSurface(screen);
while( !done )
{
delay(1); //to avoid to hung the CPU
bool renderText = false;
//Handle events on queue
while( SDL_PollEvent( &e ) != 0 )
{
//User requests quit
if( e.type == SDL_QUIT )
{
close();
exit(0);
}
else if( e.type == SDL_KEYDOWN && e.key.keysym.sym == SDLK_RETURN )
{
done = true;
}
else if(e.type == SDL_KEYDOWN && e.key.keysym.sym == SDLK_BACKSPACE )
{
if (inputText.size()>0)
inputText.pop_back();
renderText = true;
}
else if( e.type == SDL_TEXTINPUT && (inputText.size() < max_length || max_length == 0) )
{
inputText += e.text.text;
renderText = true;
}
}
if( renderText )
{
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer,texture,NULL,&r);
if (inputText.size() > 0)
draw_text(font,dim,inputText.c_str(), x, y, c);
update();
}
}
SDL_DestroyTexture(texture);
return inputText;
}
int get_mouse_x()
{
return mouseX;
}
int get_mouse_y()
{
return mouseY;
}
int get_mouse_wheel_x()
{
return mouseWheelX;
}
int get_mouse_wheel_y()
{
return mouseWheelY;
}
bool mouse_left_button_pressed()
{
return SDL_GetMouseState(NULL, NULL) & SDL_BUTTON(SDL_BUTTON_LEFT);
}
bool mouse_right_button_pressed()
{
return SDL_GetMouseState(NULL, NULL) & SDL_BUTTON(SDL_BUTTON_RIGHT);
}
}
namespace ttf_fonts
{
string load_font(string font, int dim)
{
ostringstream font_identifier;
font_identifier << font << dim;
//The string made by the font name and the dimension is used as
//an identifier to load the font in memory in order to have only one
//version in memory shared between different strings
if (fonts.find(font_identifier.str())== fonts.end())
{
TTF_Font* gFont = TTF_OpenFont( font.c_str(), dim );
if( gFont == NULL )
{
SDL_Log("Failed to load font! SDL_ttf Error: %s\n", TTF_GetError() );
SDL_Log(font.c_str());
return "";
}
fonts.insert(make_pair(font_identifier.str(),gFont));
}
return font_identifier.str();
}
void draw_text(string font, int dim, string text, int x, int y, Color c)
{
string font_identifier = load_font(font, dim);
if (font_identifier == "") return;
SDL_Surface* textSurface = TTF_RenderUTF8_Solid( fonts[font_identifier],
text.c_str(), c.c);
if( textSurface == NULL )
{
SDL_Log("Unable to render text surface! SDL_ttf Error: %s\n", TTF_GetError() );
}
else
{
SDL_Texture* texture = SDL_CreateTextureFromSurface( renderer,
textSurface );
if( texture == NULL )
{
SDL_Log("Unable to create texture from rendered text! SDL Error: %s\n", SDL_GetError() );
}
else
{
SDL_Rect r;
r.x= x;
r.y = y;
r.w = textSurface->w;
r.h = textSurface->h;
SDL_SetTextureAlphaMod( texture, c.c.a);
SDL_RenderCopy(renderer, texture,NULL,&r);
SDL_FreeSurface( textSurface );
SDL_DestroyTexture(texture);
}
}
}
int text_width(string font, int dim, string text)
{
string font_identifier = load_font(font, dim);
if (font_identifier == "") return -1;
SDL_Surface* textSurface = TTF_RenderText_Solid( fonts[font_identifier],
text.c_str(), Color(0,0,0,0).c);
if( textSurface == NULL )
{
SDL_Log("Unable to render text surface! SDL_ttf Error: %s\n", TTF_GetError() );
return -1;
}
int w = textSurface->w;
SDL_FreeSurface( textSurface );
return w;
}
int text_height(string font, int dim, string text)
{
string font_identifier = load_font(font, dim);
if (font_identifier == "") return -1;
SDL_Surface* textSurface = TTF_RenderText_Solid( fonts[font_identifier],
text.c_str(), Color(0,0,0,0).c);
if( textSurface == NULL )
{
SDL_Log("Unable to render text surface! SDL_ttf Error: %s\n", TTF_GetError() );
return -1;
}
int h = textSurface->h;
SDL_FreeSurface( textSurface );
return h;
}
} //END NAMESPACE ttf_fonts
namespace utils
{
void wait_for_button_pressed()
{
SDL_Event e;
bool done = false;
while(!done)
{
delay(1); //to avoid to hung the CPU
if ( SDL_PollEvent(&e) )
{
if (e.type == SDL_KEYDOWN)
done = true;
if (e.type == SDL_QUIT)
{
close();
exit(0);
}
}
}
}
void delay(int milliseconds)
{
SDL_Delay(milliseconds);
}
unsigned int ms_time()
{
return SDL_GetTicks();
}
int take_screenshot(string filename)
{
SDL_RWops* file = SDL_RWFromFile(filename.c_str(),"w");
int saved = SDL_SaveBMP_RW(SDL_GetWindowSurface(window), file, 1);
SDL_RWclose(file);
return saved;
}
void hide_mouse_cursor()
{
SDL_ShowCursor(SDL_DISABLE);
}
void show_mouse_cursor()
{
SDL_ShowCursor(SDL_ENABLE);
}
}//closing namespace utils
}