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ad9f1fb6 PG |
1 | #include "graphics.h" |
2 | ||
3 | #include <GL/gl.h> | |
4 | #include <GL/glu.h> | |
5 | #include <SDL/SDL.h> | |
6 | #include <cmath> | |
7 | ||
44b079f8 | 8 | #include "../debug.h" |
ad9f1fb6 PG |
9 | |
10 | static const float PI = 3.1415926535897; | |
11 | ||
12 | /// ***** Private Method Headers ***** | |
f7b3b2eb | 13 | void drawCircle(int); |
ad9f1fb6 PG |
14 | void sdlInit(); |
15 | void glInit(); | |
16 | ||
17 | /// ***** Public Methods ***** | |
18 | ||
19 | void graphicsInit() | |
20 | { | |
21 | sdlInit(); | |
22 | glInit(); | |
23 | } | |
24 | ||
25 | void graphicsCleanUp() | |
26 | { | |
27 | ||
28 | } | |
29 | ||
44b079f8 | 30 | void glDrawCircle(float radius, const Vector2* vec, const float* color) |
ad9f1fb6 | 31 | { |
f7b3b2eb PG |
32 | glMatrixMode(GL_MODELVIEW); |
33 | glLoadIdentity(); | |
44b079f8 | 34 | glTranslatef(vec->x, vec->y, -1); |
f7b3b2eb PG |
35 | glScalef(radius, radius, radius); |
36 | ||
37 | if(color != NULL) | |
38 | glColor3fv(color); | |
39 | ||
40 | drawCircle(32); | |
41 | } | |
42 | ||
43 | /// ***** Private Methods ***** | |
ad9f1fb6 | 44 | |
f7b3b2eb PG |
45 | void drawCircle(int pieces) |
46 | { | |
ad9f1fb6 | 47 | glBegin(GL_POLYGON); |
f7b3b2eb | 48 | for(int n = 0; n < pieces; n++) |
ad9f1fb6 | 49 | { |
f7b3b2eb PG |
50 | float angle = 2 * PI * n / pieces; |
51 | float ix = cos(angle); | |
52 | float iy = sin(angle); | |
ad9f1fb6 | 53 | |
f7b3b2eb | 54 | glVertex3f(ix, iy, 0); |
ad9f1fb6 PG |
55 | } |
56 | glEnd(); | |
57 | } | |
58 | ||
ad9f1fb6 PG |
59 | void sdlInit() |
60 | { | |
61 | if(SDL_Init(SDL_INIT_VIDEO) < 0) | |
62 | { | |
63 | cerr << "SDL_Init failed: " << SDL_GetError() << endl; | |
64 | exit(1); | |
65 | } | |
66 | ||
67 | // In order to use SDL_OPENGLBLIT we have to | |
68 | // set GL attributes first | |
69 | SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 8); | |
70 | SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); | |
71 | ||
72 | if(SDL_SetVideoMode(800, 600, 16, SDL_OPENGL) < 0) | |
73 | { | |
74 | cerr << "SDL_SetVideoMode failed: " << SDL_GetError() << endl; | |
75 | exit(1); | |
76 | } | |
77 | } | |
78 | ||
79 | void glInit() | |
80 | { | |
81 | glClearColor(0.0, 0.0, 0.0, 0.0); | |
82 | ||
83 | glMatrixMode(GL_PROJECTION); | |
84 | glLoadIdentity(); | |
85 | ||
f7b3b2eb | 86 | glOrtho(0, 800.0, 600.0, 0.0, -0.01, 1.01); |
ad9f1fb6 PG |
87 | |
88 | glMatrixMode(GL_MODELVIEW); | |
89 | glLoadIdentity(); | |
90 | ||
91 | glEnable(GL_DEPTH_TEST); | |
92 | } |