| 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 | |
| 18 | #include "graphics.h" |
| 19 | #include "../debug.h" |
| 20 | |
| 21 | #include <GL/gl.h> |
| 22 | #include <GL/glu.h> |
| 23 | #include <SDL/SDL.h> |
| 24 | #include <cmath> |
| 25 | |
| 26 | #include "../mathw.h" |
| 27 | |
| 28 | |
| 29 | /// ***** Private Method Headers ***** |
| 30 | |
| 31 | void glDrawCircle(int); |
| 32 | void sdlInit(); |
| 33 | void glInit(); |
| 34 | |
| 35 | /// ***** Initializers/Cleaners ***** |
| 36 | |
| 37 | void graphics::init() |
| 38 | { |
| 39 | sdlInit(); |
| 40 | glInit(); |
| 41 | } |
| 42 | |
| 43 | void graphics::clean() |
| 44 | { |
| 45 | |
| 46 | } |
| 47 | |
| 48 | /// ***** Public Methods ***** |
| 49 | |
| 50 | void graphics::drawCircle(float radius, const Vector2& pos, const float* color) |
| 51 | { |
| 52 | glMatrixMode(GL_MODELVIEW); |
| 53 | glLoadIdentity(); |
| 54 | glTranslatef(pos.x, pos.y, -1); |
| 55 | glScalef(radius, radius, radius); |
| 56 | |
| 57 | if(color != NULL) |
| 58 | glColor3fv(color); |
| 59 | |
| 60 | glDrawCircle(32); |
| 61 | } |
| 62 | |
| 63 | /// ***** Private Methods ***** |
| 64 | |
| 65 | void glDrawCircle(int pieces) |
| 66 | { |
| 67 | glBegin(GL_POLYGON); |
| 68 | for(int n = 0; n < pieces; n++) |
| 69 | { |
| 70 | float angle = 2 * PI * n / pieces; |
| 71 | float ix = cos(angle); |
| 72 | float iy = sin(angle); |
| 73 | |
| 74 | glVertex3f(ix, iy, 0); |
| 75 | } |
| 76 | glEnd(); |
| 77 | } |
| 78 | |
| 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 | |
| 106 | glOrtho(0, 800.0, 600.0, 0.0, -0.01, 1.01); |
| 107 | |
| 108 | glMatrixMode(GL_MODELVIEW); |
| 109 | glLoadIdentity(); |
| 110 | |
| 111 | glEnable(GL_DEPTH_TEST); |
| 112 | } |