| 1 | #include "graphics.h" |
| 2 | #include "../debug.h" |
| 3 | |
| 4 | #include <GL/gl.h> |
| 5 | #include <GL/glu.h> |
| 6 | #include <SDL/SDL.h> |
| 7 | #include <cmath> |
| 8 | |
| 9 | #include "../mathw.h" |
| 10 | |
| 11 | /// ***** Private Method Headers ***** |
| 12 | |
| 13 | void drawCircle(int); |
| 14 | void sdlInit(); |
| 15 | void glInit(); |
| 16 | |
| 17 | /// ***** Initializers/Cleaners ***** |
| 18 | |
| 19 | void graphicsInit() |
| 20 | { |
| 21 | sdlInit(); |
| 22 | glInit(); |
| 23 | } |
| 24 | |
| 25 | void graphicsClean() |
| 26 | { |
| 27 | |
| 28 | } |
| 29 | |
| 30 | /// ***** Public Methods ***** |
| 31 | |
| 32 | void glDrawCircle(float radius, const Vector2& vec, const float* color) |
| 33 | { |
| 34 | glMatrixMode(GL_MODELVIEW); |
| 35 | glLoadIdentity(); |
| 36 | glTranslatef(vec.x, vec.y, -1); |
| 37 | glScalef(radius, radius, radius); |
| 38 | |
| 39 | if(color != NULL) |
| 40 | glColor3fv(color); |
| 41 | |
| 42 | drawCircle(32); |
| 43 | } |
| 44 | |
| 45 | /// ***** Private Methods ***** |
| 46 | |
| 47 | void drawCircle(int pieces) |
| 48 | { |
| 49 | glBegin(GL_POLYGON); |
| 50 | for(int n = 0; n < pieces; n++) |
| 51 | { |
| 52 | float angle = 2 * PI * n / pieces; |
| 53 | float ix = cos(angle); |
| 54 | float iy = sin(angle); |
| 55 | |
| 56 | glVertex3f(ix, iy, 0); |
| 57 | } |
| 58 | glEnd(); |
| 59 | } |
| 60 | |
| 61 | void sdlInit() |
| 62 | { |
| 63 | if(SDL_Init(SDL_INIT_VIDEO) < 0) |
| 64 | { |
| 65 | cerr << "SDL_Init failed: " << SDL_GetError() << endl; |
| 66 | exit(1); |
| 67 | } |
| 68 | |
| 69 | // In order to use SDL_OPENGLBLIT we have to |
| 70 | // set GL attributes first |
| 71 | SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 8); |
| 72 | SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); |
| 73 | |
| 74 | if(SDL_SetVideoMode(800, 600, 16, SDL_OPENGL) < 0) |
| 75 | { |
| 76 | cerr << "SDL_SetVideoMode failed: " << SDL_GetError() << endl; |
| 77 | exit(1); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | void glInit() |
| 82 | { |
| 83 | glClearColor(0.0, 0.0, 0.0, 0.0); |
| 84 | |
| 85 | glMatrixMode(GL_PROJECTION); |
| 86 | glLoadIdentity(); |
| 87 | |
| 88 | glOrtho(0, 800.0, 600.0, 0.0, -0.01, 1.01); |
| 89 | |
| 90 | glMatrixMode(GL_MODELVIEW); |
| 91 | glLoadIdentity(); |
| 92 | |
| 93 | glEnable(GL_DEPTH_TEST); |
| 94 | } |