1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
#include <common.h>
#include <ctime>
SDL_Window *window = NULL;
SDL_Surface *renderSurface = NULL;
SDL_GLContext mainGLContext = NULL;
bool gameRunning = true;
UIClass ui;
Entities *entit1;
Player player;
int main(int argc,char **argv){
// Initialize SDL
if(!SDL_Init(SDL_INIT_VIDEO)){
atexit(SDL_Quit);
}else{
std::cout << "SDL was not able to initialize! Error: " << SDL_GetError() << std::endl;
return -1;
}
// Initialize SDL_image
if((IMG_Init(IMG_INIT_PNG|IMG_INIT_JPG)&(IMG_INIT_PNG|IMG_INIT_JPG))){
atexit(IMG_Quit);
}else{
std::cout<<"Could not init image libraries!\n"<<std::endl;
return -1;
}
// Create the window
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
window = SDL_CreateWindow("Independent Study v.0.1 alpha", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL
#ifdef FULLSCREEN
| SDL_WINDOW_FULLSCREEN
#endif // FULLSCREEN
);
if(!window){
std::cout << "The window failed to generate! Error: " << SDL_GetError() << std::endl;
return -1;
}
// Set OpenGL context
if((mainGLContext = SDL_GL_CreateContext(window))==NULL){
std::cout << "The OpenGL context failed to initialize! Error: " << SDL_GetError() << std::endl;
}
// Setup rand() and OpenGL
srand(time(NULL));
glClearColor(.3,.5,.8,0);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
/**************************
**** GAMELOOP ****
**************************/
entit1 = &player;
entit1->spawn(0,0);
World *w=new World(2);
while(gameRunning){
ui.handleEvents(); // Handle events
//a matrix is a blank canvas for the computer to draw on, the matrices are stored in a "stack"
//GL_PROJECTION has 2 matrices
//GL_MODELVIEW has 32 matrices
glMatrixMode(GL_PROJECTION); //set the matrix mode as projection so we can set the ortho size and the camera settings later on
glPushMatrix(); //push the matrix to the top of the matrix stack
glLoadIdentity(); //replace the entire matrix stack with the updated GL_PROJECTION mode
glOrtho(-1,1,-1,1,-1,1); //set the the size of the screen
glMatrixMode(GL_MODELVIEW); //set the matrix to modelview so we can draw objects
glPushMatrix(); //push the matrix to the top of the matrix stack
glLoadIdentity(); //replace the entire matrix stack with the updated GL_MODELVIEW mode
glPushMatrix(); //basically here we put a blank canvas (new matrix) on the screen to draw on
glClear(GL_COLOR_BUFFER_BIT); //clear the matrix on the top of the stack
/**************************
**** RENDER STUFF HERE ****
**************************/
w->draw();
glColor3ub(0,0,0);
glRectf(player.loc.x, player.loc.y, player.loc.x + player.width, player.loc.y + player.height);
/**************************
**** CLOSE THE LOOP ****
**************************/
glPopMatrix(); //take the matrix(s) off the stack to pass them to the renderer
SDL_GL_SwapWindow(window); //give the stack to SDL to render it
}
/**************************
**** CLOSE PROGRAM ****
**************************/
//closes the window and frees resources
SDL_GL_DeleteContext(mainGLContext);
SDL_DestroyWindow(window);
return 0;
}
|
