src/backend/shapes.c

   1 /************************************************************************
   2     This file is part of NE.
   3
   4     NE 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     NE 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 NE.  If not, see <http://www.gnu.org/licenses/>.
  16 ************************************************************************/
  17
  18 #include "shapes.h"
  19
  20 #include <GL/gl.h>
  21 #include <math.h>
  22
  23 static GLuint circle, quad, cube, sphere;
  24
  25 void shapes_init()
  26 {
  27         static int init = 0;
  28         if (init) return;
  29
  30         init = 1;
  31
  32         quad = glGenLists(1);
  33         {
  34                 glNewList(quad,GL_COMPILE);
  35                 glBegin( GL_QUADS );
  36                 glNormal3f(0.0,0.0,1.0);
  37                 glTexCoord2f(1.0,1.0); glVertex2f( 0.5, 0.5);
  38                 glTexCoord2f(0.0,1.0); glVertex2f(-0.5, 0.5);
  39                 glTexCoord2f(0.0,0.0); glVertex2f(-0.5,-0.5);
  40                 glTexCoord2f(1.0,0.0); glVertex2f( 0.5,-0.5);
  41                 glEnd();
  42                 glEndList();
  43         }
  44
  45         circle = glGenLists(1);
  46         {
  47                 glNewList(circle,GL_COMPILE);
  48             int points = 64;
  49                 glBegin(GL_TRIANGLE_FAN);
  50                 glNormal3f(0.0f, 0.0f, 1.0f);
  51                 int i;
  52             for (i=0; i<points; i++)
  53             {
  54                 float t = (float)i/points;
  55                 t *= 2 * M_PI;
  56                 glVertex2f(0.5*cos(t),0.5*sin(t));
  57             }
  58             glEnd();
  59             glEndList();
  60         }
  61
  62         cube = glGenLists(1);
  63         {
  64                 glNewList(cube,GL_COMPILE);
  65                 glBegin(GL_QUADS);
  66                 // front
  67                 glNormal3f(0.0f, 0.0f, 1.0f);
  68                 glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f,-0.5f, 0.5f);
  69                 glTexCoord2f(1.0f, 0.0f); glVertex3f( 0.5f,-0.5f, 0.5f);
  70                 glTexCoord2f(1.0f, 1.0f); glVertex3f( 0.5f, 0.5f, 0.5f);
  71                 glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f, 0.5f);
  72                 // back
  73                 glNormal3f(0.0f, 0.0f,-1.0f);
  74                 glTexCoord2f(1.0f, 0.0f); glVertex3f(-0.5f,-0.5f,-0.5f);
  75                 glTexCoord2f(1.0f, 1.0f); glVertex3f(-0.5f, 0.5f,-0.5f);
  76                 glTexCoord2f(0.0f, 1.0f); glVertex3f( 0.5f, 0.5f,-0.5f);
  77                 glTexCoord2f(0.0f, 0.0f); glVertex3f( 0.5f,-0.5f,-0.5f);
  78                 // top
  79                 glNormal3f(0.0f, 1.0f, 0.0f);
  80                 glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f,-0.5f);
  81                 glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, 0.5f, 0.5f);
  82                 glTexCoord2f(1.0f, 0.0f); glVertex3f( 0.5f, 0.5f, 0.5f);
  83                 glTexCoord2f(1.0f, 1.0f); glVertex3f( 0.5f, 0.5f,-0.5f);
  84                 // bottom
  85                 glNormal3f(0.0f,-1.0f, 0.0f);
  86                 glTexCoord2f(1.0f, 1.0f); glVertex3f(-0.5f,-0.5f,-0.5f);
  87                 glTexCoord2f(0.0f, 1.0f); glVertex3f( 0.5f,-0.5f,-0.5f);
  88                 glTexCoord2f(0.0f, 0.0f); glVertex3f( 0.5f,-0.5f, 0.5f);
  89                 glTexCoord2f(1.0f, 0.0f); glVertex3f(-0.5f,-0.5f, 0.5f);
  90                 // right
  91                 glNormal3f(1.0f, 0.0f, 0.0f);
  92                 glTexCoord2f(1.0f, 0.0f); glVertex3f( 0.5f,-0.5f,-0.5f);
  93                 glTexCoord2f(1.0f, 1.0f); glVertex3f( 0.5f, 0.5f,-0.5f);
  94                 glTexCoord2f(0.0f, 1.0f); glVertex3f( 0.5f, 0.5f, 0.5f);
  95                 glTexCoord2f(0.0f, 0.0f); glVertex3f( 0.5f,-0.5f, 0.5f);
  96                 // left
  97                 glNormal3f(-1.0f, 0.0f, 0.0f);
  98                 glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f,-0.5f,-0.5f);
  99                 glTexCoord2f(1.0f, 0.0f); glVertex3f(-0.5f,-0.5f, 0.5f);
 100                 glTexCoord2f(1.0f, 1.0f); glVertex3f(-0.5f, 0.5f, 0.5f);
 101                 glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f,-0.5f);
 102                 glEnd();
 103                 glEndList();
 104         }
 105 }
 106
 107 void shapes_texturize(struct texture *tex, int tile)
 108 {
 109         if (tex)
 110         {
 111                 glEnable(GL_TEXTURE_2D);
 112                 glMatrixMode(GL_TEXTURE);
 113                 glLoadIdentity();
 114                 glScalef(tile,tile,tile);
 115                 glMatrixMode(GL_MODELVIEW);
 116                 t_apply(tex);
 117         }
 118         else
 119         {
 120                 glDisable(GL_TEXTURE_2D);
 121         }
 122 }
 123
 124 void draw_quad()
 125 {
 126         glCallList(quad);
 127 }
 128
 129 void draw_circle()
 130 {
 131         glCallList(circle);
 132 }
 133
 134 void draw_cube()
 135 {
 136         glCallList(cube);
 137 }
 138
 139 void draw_sphere()
 140 {
 141         glCallList(sphere);
 142 }
 143