| 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 | |
| 20 | #include <bear/debug.h> |
| 21 | #include <bear/mathw.h> |
| 22 | using namespace bear; |
| 23 | |
| 24 | #include <GL/gl.h> |
| 25 | #include <GL/glu.h> |
| 26 | #include <SDL/SDL.h> |
| 27 | #include <cmath> |
| 28 | |
| 29 | #include <iostream> |
| 30 | using std::cerr; |
| 31 | using std::cout; |
| 32 | using std::endl; |
| 33 | |
| 34 | |
| 35 | /// ***** Private Method Headers ***** |
| 36 | |
| 37 | void glDrawCircle(int); |
| 38 | void glDrawPolygon( const std::vector<Vector2>& points ); |
| 39 | void sdlInit(); |
| 40 | void glInit(); |
| 41 | |
| 42 | /// ***** Initializers/Cleaners ***** |
| 43 | |
| 44 | void graphics::init() |
| 45 | { |
| 46 | sdlInit(); |
| 47 | glInit(); |
| 48 | } |
| 49 | |
| 50 | void graphics::clean() |
| 51 | { |
| 52 | |
| 53 | } |
| 54 | |
| 55 | /// ***** Public Methods ***** |
| 56 | |
| 57 | void graphics::drawCircle(float radius, const Vector2& pos, const float* color) |
| 58 | { |
| 59 | glMatrixMode(GL_MODELVIEW); |
| 60 | glLoadIdentity(); |
| 61 | glTranslatef(pos.m_fX, pos.m_fY, -1); |
| 62 | glScalef(radius, radius, radius); |
| 63 | |
| 64 | if(color != NULL) |
| 65 | glColor3fv(color); |
| 66 | |
| 67 | glDrawCircle(32); |
| 68 | } |
| 69 | |
| 70 | void graphics::drawPolygon |
| 71 | ( |
| 72 | const std::vector<Vector2>& points, |
| 73 | const float* color |
| 74 | ) |
| 75 | { |
| 76 | glMatrixMode(GL_MODELVIEW); |
| 77 | glLoadIdentity(); |
| 78 | |
| 79 | if(color != NULL) |
| 80 | glColor3fv(color); |
| 81 | |
| 82 | glDrawPolygon(points); |
| 83 | } |
| 84 | |
| 85 | /// ***** Private Methods ***** |
| 86 | |
| 87 | void glDrawCircle(int pieces) |
| 88 | { |
| 89 | glBegin(GL_POLYGON); |
| 90 | for(int n = 0; n < pieces; n++) |
| 91 | { |
| 92 | float angle = 2 * PI * n / pieces; |
| 93 | float ix = cos(angle); |
| 94 | float iy = sin(angle); |
| 95 | |
| 96 | glVertex3f(ix, iy, 0); |
| 97 | } |
| 98 | glEnd(); |
| 99 | } |
| 100 | |
| 101 | void glDrawPolygon( const std::vector<Vector2>& points ) |
| 102 | { |
| 103 | glBegin(GL_POLYGON); |
| 104 | for(unsigned int n = 0; n < points.size(); n++) |
| 105 | { |
| 106 | const Vector2& vec = points.at(n); |
| 107 | |
| 108 | glVertex3f(vec.m_fX, vec.m_fY, 0); |
| 109 | } |
| 110 | glEnd(); |
| 111 | } |
| 112 | |
| 113 | void sdlInit() |
| 114 | { |
| 115 | if(SDL_Init(SDL_INIT_VIDEO) < 0) |
| 116 | { |
| 117 | cerr << "SDL_Init failed: " << SDL_GetError() << endl; |
| 118 | exit(1); |
| 119 | } |
| 120 | |
| 121 | // In order to use SDL_OPENGLBLIT we have to |
| 122 | // set GL attributes first |
| 123 | SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 8); |
| 124 | SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); |
| 125 | |
| 126 | if(SDL_SetVideoMode(800, 600, 16, SDL_OPENGL) < 0) |
| 127 | { |
| 128 | cerr << "SDL_SetVideoMode failed: " << SDL_GetError() << endl; |
| 129 | exit(1); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | void glInit() |
| 134 | { |
| 135 | glClearColor(0.0, 0.0, 0.0, 0.0); |
| 136 | |
| 137 | glMatrixMode(GL_PROJECTION); |
| 138 | glLoadIdentity(); |
| 139 | |
| 140 | glOrtho(0, 800.0, 600.0, 0.0, -0.01, 1.01); |
| 141 | |
| 142 | glMatrixMode(GL_MODELVIEW); |
| 143 | glLoadIdentity(); |
| 144 | |
| 145 | glEnable(GL_DEPTH_TEST); |
| 146 | |
| 147 | // anti aliasing? |
| 148 | /* |
| 149 | glEnable(GL_BLEND); |
| 150 | glEnable(GL_POLYGON_SMOOTH_HINT); |
| 151 | |
| 152 | glBlendFunc(GL_SRC_ALPHA_SATURATE, GL_ONE); |
| 153 | |
| 154 | glHint(GL_POLYGON_SMOOTH_HINT, GL_DONT_CARE); |
| 155 | */ |
| 156 | } |