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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" |
3d1f0813 | 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 | ||
3d1f0813 | 26 | #include "mathw.h" |
ad9f1fb6 | 27 | |
ca2d526e PG |
28 | #include <iostream> |
29 | using std::cerr; | |
30 | using std::cout; | |
31 | using std::endl; | |
32 | ||
68b2316d | 33 | |
ad9f1fb6 | 34 | /// ***** Private Method Headers ***** |
617dcc71 | 35 | |
68b2316d | 36 | void glDrawCircle(int); |
4a76d2e2 | 37 | void glDrawPolygon( const std::vector<Vector2>& points ); |
ad9f1fb6 PG |
38 | void sdlInit(); |
39 | void glInit(); | |
40 | ||
617dcc71 | 41 | /// ***** Initializers/Cleaners ***** |
ad9f1fb6 | 42 | |
68b2316d | 43 | void graphics::init() |
ad9f1fb6 PG |
44 | { |
45 | sdlInit(); | |
46 | glInit(); | |
47 | } | |
48 | ||
68b2316d | 49 | void graphics::clean() |
ad9f1fb6 PG |
50 | { |
51 | ||
52 | } | |
53 | ||
617dcc71 PG |
54 | /// ***** Public Methods ***** |
55 | ||
58ac440e | 56 | void graphics::drawCircle(float radius, const Vector2& pos, const float* color) |
ad9f1fb6 | 57 | { |
f7b3b2eb PG |
58 | glMatrixMode(GL_MODELVIEW); |
59 | glLoadIdentity(); | |
9d6dea5f | 60 | glTranslatef(pos.m_fX, pos.m_fY, -1); |
f7b3b2eb PG |
61 | glScalef(radius, radius, radius); |
62 | ||
63 | if(color != NULL) | |
64 | glColor3fv(color); | |
65 | ||
68b2316d | 66 | glDrawCircle(32); |
f7b3b2eb PG |
67 | } |
68 | ||
4a76d2e2 PG |
69 | void graphics::drawPolygon |
70 | ( | |
71 | const std::vector<Vector2>& points, | |
72 | const float* color | |
73 | ) | |
74 | { | |
75 | glMatrixMode(GL_MODELVIEW); | |
76 | glLoadIdentity(); | |
77 | ||
78 | if(color != NULL) | |
79 | glColor3fv(color); | |
80 | ||
81 | glDrawPolygon(points); | |
82 | } | |
83 | ||
f7b3b2eb | 84 | /// ***** Private Methods ***** |
ad9f1fb6 | 85 | |
68b2316d | 86 | void glDrawCircle(int pieces) |
f7b3b2eb | 87 | { |
ad9f1fb6 | 88 | glBegin(GL_POLYGON); |
f7b3b2eb | 89 | for(int n = 0; n < pieces; n++) |
ad9f1fb6 | 90 | { |
f7b3b2eb PG |
91 | float angle = 2 * PI * n / pieces; |
92 | float ix = cos(angle); | |
93 | float iy = sin(angle); | |
ad9f1fb6 | 94 | |
f7b3b2eb | 95 | glVertex3f(ix, iy, 0); |
ad9f1fb6 PG |
96 | } |
97 | glEnd(); | |
98 | } | |
99 | ||
4a76d2e2 PG |
100 | void glDrawPolygon( const std::vector<Vector2>& points ) |
101 | { | |
102 | glBegin(GL_POLYGON); | |
103 | for(unsigned int n = 0; n < points.size(); n++) | |
104 | { | |
105 | const Vector2& vec = points.at(n); | |
106 | ||
9d6dea5f | 107 | glVertex3f(vec.m_fX, vec.m_fY, 0); |
4a76d2e2 PG |
108 | } |
109 | glEnd(); | |
110 | } | |
111 | ||
ad9f1fb6 PG |
112 | void sdlInit() |
113 | { | |
114 | if(SDL_Init(SDL_INIT_VIDEO) < 0) | |
115 | { | |
116 | cerr << "SDL_Init failed: " << SDL_GetError() << endl; | |
117 | exit(1); | |
118 | } | |
119 | ||
120 | // In order to use SDL_OPENGLBLIT we have to | |
121 | // set GL attributes first | |
122 | SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 8); | |
123 | SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); | |
124 | ||
125 | if(SDL_SetVideoMode(800, 600, 16, SDL_OPENGL) < 0) | |
126 | { | |
127 | cerr << "SDL_SetVideoMode failed: " << SDL_GetError() << endl; | |
128 | exit(1); | |
129 | } | |
130 | } | |
131 | ||
132 | void glInit() | |
133 | { | |
134 | glClearColor(0.0, 0.0, 0.0, 0.0); | |
135 | ||
136 | glMatrixMode(GL_PROJECTION); | |
137 | glLoadIdentity(); | |
138 | ||
f7b3b2eb | 139 | glOrtho(0, 800.0, 600.0, 0.0, -0.01, 1.01); |
ad9f1fb6 PG |
140 | |
141 | glMatrixMode(GL_MODELVIEW); | |
142 | glLoadIdentity(); | |
143 | ||
144 | glEnable(GL_DEPTH_TEST); | |
b625a3cb PG |
145 | |
146 | // anti aliasing? | |
147 | /* | |
148 | glEnable(GL_BLEND); | |
149 | glEnable(GL_POLYGON_SMOOTH_HINT); | |
150 | ||
151 | glBlendFunc(GL_SRC_ALPHA_SATURATE, GL_ONE); | |
152 | ||
153 | glHint(GL_POLYGON_SMOOTH_HINT, GL_DONT_CARE); | |
154 | */ | |
ad9f1fb6 | 155 | } |