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e68f847b PG |
1 | /* |
2 | * Copyright (C) 2008 Patrik Gornicz, Gornicz_P (at) hotmail (dot) com. | |
3 | * | |
4 | * This program is free software: you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 3 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
ad9f1fb6 | 18 | #include "graphics.h" |
617dcc71 | 19 | #include "../debug.h" |
ad9f1fb6 PG |
20 | |
21 | #include <GL/gl.h> | |
22 | #include <GL/glu.h> | |
23 | #include <SDL/SDL.h> | |
24 | #include <cmath> | |
25 | ||
617dcc71 | 26 | #include "../mathw.h" |
ad9f1fb6 | 27 | |
68b2316d | 28 | |
ad9f1fb6 | 29 | /// ***** Private Method Headers ***** |
617dcc71 | 30 | |
68b2316d | 31 | void glDrawCircle(int); |
ad9f1fb6 PG |
32 | void sdlInit(); |
33 | void glInit(); | |
34 | ||
617dcc71 | 35 | /// ***** Initializers/Cleaners ***** |
ad9f1fb6 | 36 | |
68b2316d | 37 | void graphics::init() |
ad9f1fb6 PG |
38 | { |
39 | sdlInit(); | |
40 | glInit(); | |
41 | } | |
42 | ||
68b2316d | 43 | void graphics::clean() |
ad9f1fb6 PG |
44 | { |
45 | ||
46 | } | |
47 | ||
617dcc71 PG |
48 | /// ***** Public Methods ***** |
49 | ||
68b2316d | 50 | void graphics::drawCircle(float radius, const Vector2& vec, const float* color) |
ad9f1fb6 | 51 | { |
f7b3b2eb PG |
52 | glMatrixMode(GL_MODELVIEW); |
53 | glLoadIdentity(); | |
89ca62b2 | 54 | glTranslatef(vec.x, vec.y, -1); |
f7b3b2eb PG |
55 | glScalef(radius, radius, radius); |
56 | ||
57 | if(color != NULL) | |
58 | glColor3fv(color); | |
59 | ||
68b2316d | 60 | glDrawCircle(32); |
f7b3b2eb PG |
61 | } |
62 | ||
63 | /// ***** Private Methods ***** | |
ad9f1fb6 | 64 | |
68b2316d | 65 | void glDrawCircle(int pieces) |
f7b3b2eb | 66 | { |
ad9f1fb6 | 67 | glBegin(GL_POLYGON); |
f7b3b2eb | 68 | for(int n = 0; n < pieces; n++) |
ad9f1fb6 | 69 | { |
f7b3b2eb PG |
70 | float angle = 2 * PI * n / pieces; |
71 | float ix = cos(angle); | |
72 | float iy = sin(angle); | |
ad9f1fb6 | 73 | |
f7b3b2eb | 74 | glVertex3f(ix, iy, 0); |
ad9f1fb6 PG |
75 | } |
76 | glEnd(); | |
77 | } | |
78 | ||
ad9f1fb6 PG |
79 | void sdlInit() |
80 | { | |
81 | if(SDL_Init(SDL_INIT_VIDEO) < 0) | |
82 | { | |
83 | cerr << "SDL_Init failed: " << SDL_GetError() << endl; | |
84 | exit(1); | |
85 | } | |
86 | ||
87 | // In order to use SDL_OPENGLBLIT we have to | |
88 | // set GL attributes first | |
89 | SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 8); | |
90 | SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); | |
91 | ||
92 | if(SDL_SetVideoMode(800, 600, 16, SDL_OPENGL) < 0) | |
93 | { | |
94 | cerr << "SDL_SetVideoMode failed: " << SDL_GetError() << endl; | |
95 | exit(1); | |
96 | } | |
97 | } | |
98 | ||
99 | void glInit() | |
100 | { | |
101 | glClearColor(0.0, 0.0, 0.0, 0.0); | |
102 | ||
103 | glMatrixMode(GL_PROJECTION); | |
104 | glLoadIdentity(); | |
105 | ||
f7b3b2eb | 106 | glOrtho(0, 800.0, 600.0, 0.0, -0.01, 1.01); |
ad9f1fb6 PG |
107 | |
108 | glMatrixMode(GL_MODELVIEW); | |
109 | glLoadIdentity(); | |
110 | ||
111 | glEnable(GL_DEPTH_TEST); | |
112 | } |