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main-sdl.c
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main-sdl.c
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// cc *.c $(sdl2-config --cflags --libs)
//sudo apt install libsdl2-dev
// cd ~/src/sdl2-in-c/ && rm a.out && cc *.c $(sdl2-config --cflags --libs) && ./a.out && echo STOP
//sudo apt install libsdl2-2.0-0 libsdl2-dev libsdl2-image-2.0-0 libsdl2-image-dev
// cd ~/src/sdl-tutorial/ && cc *.c $(pkg-config --cflags --libs sdl2 SDL2_image) && ./a.out && echo STOP
//https://www.geeksforgeeks.org/sdl-library-in-c-c-with-examples/
#include <SDL2/SDL.h>
#include <stdio.h>
#define main3 main
int px=0, py=0;
char * worlds[] = {
"assets/map01.txt",
"assets/map02.txt",
"assets/map03.txt"
};
int worlds_current = -1;
typedef struct map_struct {
int width, height;
char * * matrix;
} Map;
Map map = { .matrix =NULL, .width =0, .height =0 };
void map_unload(Map * map){
for(int i=0; i < map->height; i++)
free(map->matrix[i]);
free(map->matrix);
map->matrix=NULL;
map->width=0;
map->height=0;
}
void map_post_load(Map * map){
for(int yi=0; yi < map->height; yi++)
for(int xi=0; xi < map->width; xi++){
char map_char = map->matrix[yi][xi];
if(map_char=='P'){
map->matrix[yi][xi] = ' ';
px=xi; py=yi;
}
}
}
void map_load(Map * map, char* file_path){
map_unload(map);
int map_width = -1; int map_height = 0;
char * * map_matrix = (char * *) calloc(1,sizeof(char*));
FILE* file = fopen(file_path,"r");
char line[1001];
while(fgets(line,1001,file)){
if(map_width==-1) map_width = strlen(line) - 1;
line[map_width]='\0';
map_height += 1;
map_matrix = (char * *) realloc(map_matrix, sizeof(char*) * map_height);
map_matrix[map_height - 1] = calloc(map_width+1,sizeof(char));
strcpy(map_matrix[map_height - 1],line);
}
map->height = map_height;
map->width = map_width;
map->matrix = map_matrix;
map_post_load(map);
}
//////////////////////////////////////////////
void ensure(int return_code){
if(return_code != 0)
printf("error initializing SDL: %s\n", SDL_GetError());
}
int mx, my; Uint32 mbuttons;
int mouse_left_down, mouse_left_just_down, mouse_left_down_previous=0;
int events(){
SDL_PumpEvents();
mbuttons = SDL_GetMouseState(&mx, &my);
mouse_left_down = mbuttons & SDL_BUTTON_LMASK;
mouse_left_just_down = mouse_left_down && ! mouse_left_down_previous;
mouse_left_down_previous = mouse_left_down;
SDL_Event event;
while (SDL_PollEvent(&event)) {
if( event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_ESCAPE ) return 0;
switch (event.type) {
case SDL_QUIT: return 0;
case SDL_KEYDOWN:
int tx =px; int ty =py;
switch(event.key.keysym.sym){
case SDLK_DOWN: ty++; break;
case SDLK_UP: ty--; break;
case SDLK_RIGHT: tx++; break;
case SDLK_LEFT: tx--; break;
}
if( tx <map.width && ty <map.height && tx >=0 && ty >=0 ){
char going=map.matrix[ty][tx];
if(going != '#'){
px=tx; py=ty;
if(going == 'E') map_load(&map,worlds[++worlds_current]);
}
}
break;
}
}
return 1;
}
int in_rect(int x, int y, struct SDL_Rect *r) {
return (x >= r->x) && (y >= r->y) &&
(x < r->x + r->w) && (y < r->y + r->h);
}
int rgb[][3] = {
{203, 203, 203}, // Gray
{254, 254, 31}, // Yellow
{0, 255, 255}, // Cyan
{0, 0, 0}, // Black
{0, 254, 30}, // Green
{255, 16, 253}, // Magenta
{253, 3, 2}, // Red
{18, 14, 252} // Blue
};
int rgb_size = sizeof rgb / sizeof rgb[0];
void draw_colors(SDL_Renderer * renderer, int i_current, int view_width, int view_height){
SDL_Rect colorBar;
colorBar.x = 0; colorBar.y = 0; colorBar.w = view_width/rgb_size; colorBar.h = view_height;
int* color;
SDL_Rect rectangle;
int background_color[] = { 50, 50, 50 };
for(int i = -1 ; i <= i_current ; i++ ){
if(i==-1){
color = background_color;
SDL_Rect view={.x=0,.y=0,.w=view_width,.h=view_height};
rectangle = view;
}else{
color = rgb[i];
colorBar.x = i*colorBar.w;
rectangle = colorBar;
}
SDL_SetRenderDrawColor( renderer, color[0], color[1], color[2], 255 );
SDL_RenderFillRect( renderer, &rectangle );
}
}
///////////////////////////////////
// maze/images (third app)
int main3(int argc, char* argv[]){
ensure( SDL_Init( SDL_INIT_VIDEO ) );
int view_width=400, view_height=300;
SDL_Window * window;
SDL_Renderer * renderer;
ensure( SDL_CreateWindowAndRenderer( view_width, view_height, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE, &window, &renderer ) );
SDL_SetWindowTitle(window, "mini-maze with (lib)SDL2");
char * filename[4]={
"assets/P.bmp",
"assets/-.bmp",
"assets/W.bmp",
"assets/E.bmp"
};
const int count=4;
SDL_Surface * image[count];
SDL_Texture * texture[count];
for(int i=0; i<count; i++){
image[i] = SDL_LoadBMP(filename[i]);
if(image[i]==NULL){
printf("file-name not found: [[ %s ]]\n",filename[i]);
return 1;
}
texture[i] = SDL_CreateTextureFromSurface(renderer, image[i]);
}
map_load(&map,worlds[++worlds_current]);
while(events()){
const int tile_size=32;
if(mouse_left_down){
int tx,ty;
tx=mx/tile_size;
ty=my/tile_size;
if(tx<map.width && ty<map.height){
if(
(abs(tx-px)==1 && ty==py)
|| (abs(ty-py)==1 && tx==px)){
char going=map.matrix[ty][tx];
if(going != '#'){
px=tx; py=ty;
if(going == 'E') map_load(&map,worlds[++worlds_current]);
}
}
}
}
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer);
for(int yi=0; yi<map.height; yi++)
for(int xi=0; xi<map.width; xi++){
char map_char = map.matrix[yi][xi];
if(yi==py && xi==px) map_char='P';
int map_tile_type = 1;
switch(map_char){
case 'P': map_tile_type=0; break;
case ' ': map_tile_type=1; break;
case '#': map_tile_type=2; break;
case 'E': map_tile_type=3; break;
}
SDL_Rect dst_rect = { xi*tile_size, yi*tile_size, tile_size, tile_size };
SDL_RenderCopy(renderer, texture[map_tile_type], NULL, &dst_rect);
}
SDL_RenderPresent( renderer );
}
map_unload(&map);
for(int i=0; i<count; i++){
SDL_DestroyTexture(texture[i]);
SDL_FreeSurface(image[i]);
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
// simpler (second app)
int main2(int argc, char* argv[]){
ensure( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_TIMER ) );
int view_width=400, view_height=300;
SDL_Window * window;
SDL_Renderer * renderer;
ensure( SDL_CreateWindowAndRenderer( view_width, view_height, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE, &window, &renderer ) );
SDL_SetRenderDrawBlendMode(renderer,SDL_BLENDMODE_BLEND);
double x1=0;
double x2=0;
int lastTime = SDL_GetTicks(), currentTime;
while(events()){
currentTime = SDL_GetTicks();
int dt = currentTime - lastTime;
lastTime = currentTime;
SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
SDL_RenderClear(renderer);
x1+=dt*0.02;
if(x1>150) x1=0;
SDL_Rect button1={.x=x1,.y=10,.w=50,.h=50};
int button_color[] = { 0, 50, 50 };
SDL_SetRenderDrawColor( renderer, button_color[0], button_color[1], button_color[2], 100 );
SDL_RenderFillRect( renderer, &button1 );
x2+=dt*0.08;
if(x2>150) x2=0;
SDL_Rect button2={.x=x2,.y=10+50+10,.w=50,.h=50};
//int button_color[] = { 0, 50, 50 };
SDL_SetRenderDrawColor( renderer, button_color[0], button_color[1], button_color[2], 50 );
SDL_RenderFillRect( renderer, &button2 );
SDL_RenderPresent( renderer );
}
SDL_DestroyWindow( window );
SDL_DestroyRenderer( renderer );
SDL_Quit();
return 0;
}
// more advanced (first app)
int main1(int argc, char* argv[])
{
ensure( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_TIMER ) );
int view_width=400, view_height=300;
SDL_Window * window;
SDL_Renderer * renderer;
ensure( SDL_CreateWindowAndRenderer( view_width, view_height, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE, &window, &renderer ) );
int i = -1;
int lastTime = SDL_GetTicks(), currentTime;
while(events()){
SDL_GetWindowSize(window, &view_width, &view_height);
draw_colors(renderer, i, view_width, view_height);
int button_color[] = { 0, 50, 50 };
SDL_Rect button={.x=10,.y=10,.w=50,.h=50};
SDL_SetRenderDrawColor( renderer, button_color[0], button_color[1], button_color[2], 255 );
SDL_RenderFillRect( renderer, &button );
int x, y; Uint32 buttons;
SDL_PumpEvents(); buttons = SDL_GetMouseState(&x, &y);
if ((buttons & SDL_BUTTON_LMASK) != 0 && in_rect(x,y, &button) ) {
SDL_Event quit_event;
quit_event.type = SDL_QUIT;
SDL_PushEvent(&quit_event);
}
SDL_RenderPresent( renderer );
currentTime = SDL_GetTicks();
if (currentTime >= lastTime + 500) {
i += 1;
lastTime = currentTime;
}
if( i >= rgb_size ) i = -1;
}
SDL_DestroyWindow( window );
SDL_DestroyRenderer( renderer );
SDL_Quit();
return 0;
}
//==========================================
// . sdl-cross-compile.sh
// wine sdl-app.exe
#if defined(_WIN64)
#include <windows.h>
int WINAPI WinMain( HINSTANCE hInstance, // HANDLE TO AN INSTANCE. This is the "handle" to YOUR PROGRAM ITSELF.
HINSTANCE hPrevInstance,// USELESS on modern windows (totally ignore hPrevInstance)
LPSTR szCmdLine, // Command line arguments. similar to argv in standard C programs
int iCmdShow ) // Start window maximized, minimized, etc.
{
char* argv[]={"main-sdl"};
return main(1,argv);
}
#endif