git.mutantstargoat.com Git - voxscape/blob - src/main.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <math.h>
   5 #include <assert.h>
   6 #include <GL/glut.h>
   7 #include "glfb.h"
   8 #include "voxscape.h"
   9 #include "lut.h"
  10
  11 enum {
  12         INP_FWD         = 0x01,
  13         INP_BACK        = 0x02,
  14         INP_LEFT        = 0x04,
  15         INP_RIGHT       = 0x08,
  16         INP_LTURN       = 0x10,
  17         INP_RTURN       = 0x20
  18 };
  19
  20 int init(void);
  21 void cleanup(void);
  22 void display(void);
  23 void idle(void);
  24 void reshape(int x, int y);
  25 void keyb(unsigned char key, int x, int y);
  26 void keyb_up(unsigned char key, int x, int y);
  27 void mouse(int bn, int st, int x, int y);
  28 void motion(int x, int y);
  29
  30 int win_width, win_height;
  31
  32 #define FB_W    640
  33 #define FB_H    480
  34 unsigned int fb[FB_W * FB_H];
  35
  36 int mouse_x, mouse_y, mwarp, mbstate[3];
  37 int hfilt = VOX_LINEAR, cfilt = VOX_LINEAR;
  38
  39 unsigned int input;
  40 int32_t pos[2], angle;
  41
  42 struct voxscape *vox;
  43
  44 #define COLOR_HORIZON   0xcc77ff
  45 #define COLOR_ZENITH    0x5588cc
  46
  47
  48 int main(int argc, char **argv)
  49 {
  50         glutInit(&argc, argv);
  51         glutInitWindowSize(1280, 960);
  52         glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
  53         glutCreateWindow("voxel landscape test");
  54
  55         glutDisplayFunc(display);
  56         glutIdleFunc(idle);
  57         glutReshapeFunc(reshape);
  58         glutKeyboardFunc(keyb);
  59         glutKeyboardUpFunc(keyb_up);
  60         glutMouseFunc(mouse);
  61         glutMotionFunc(motion);
  62
  63         if(init() == -1) {
  64                 return 1;
  65         }
  66         atexit(cleanup);
  67
  68         glutMainLoop();
  69         return 0;
  70 }
  71
  72
  73 int init(void)
  74 {
  75         init_lut();
  76
  77         pos[0] = 512 << 16;
  78         pos[1] = 512 << 16;
  79
  80         if(!(vox = vox_open("data/height.png", "data/color.png"))) {
  81                 return -1;
  82         }
  83         vox_framebuf(vox, FB_W, FB_H, fb, -1);
  84         vox_proj(vox, 45, 1, 300);
  85         vox_fog(vox, 260, COLOR_HORIZON);
  86         vox_filter(vox, hfilt, cfilt);
  87
  88         glfb_setup(FB_W, FB_H, GLFB_RGBA32, FB_W * 4);
  89         return 0;
  90 }
  91
  92 void cleanup(void)
  93 {
  94         vox_free(vox);
  95 }
  96
  97 #define WALK_SPEED      0x40000
  98 #define TURN_SPEED      0x100
  99
 100 void update(void)
 101 {
 102         int32_t fwd[2], right[2];
 103
 104         if(input & INP_LTURN) angle += TURN_SPEED;
 105         if(input & INP_RTURN) angle -= TURN_SPEED;
 106
 107         fwd[0] = -SIN(angle);
 108         fwd[1] = COS(angle);
 109         right[0] = fwd[1];
 110         right[1] = -fwd[0];
 111
 112         if(input & INP_FWD) {
 113                 pos[0] += fwd[0];
 114                 pos[1] += fwd[1];
 115         }
 116         if(input & INP_BACK) {
 117                 pos[0] -= fwd[0];
 118                 pos[1] -= fwd[1];
 119         }
 120         if(input & INP_RIGHT) {
 121                 pos[0] += right[0];
 122                 pos[1] += right[1];
 123         }
 124         if(input & INP_LEFT) {
 125                 pos[0] -= right[0];
 126                 pos[1] -= right[1];
 127         }
 128
 129         vox_view(vox, pos[0], pos[1], -30, angle);
 130 }
 131
 132 void display(void)
 133 {
 134         update();
 135
 136         vox_render(vox);
 137         vox_sky_grad(vox, COLOR_HORIZON, COLOR_ZENITH);
 138
 139         glfb_update(fb);
 140         glfb_display();
 141
 142         glutSwapBuffers();
 143         assert(glGetError() == GL_NO_ERROR);
 144
 145         if(mbstate[0]) {
 146                 mwarp = 1;
 147                 glutWarpPointer(win_width / 2, win_height / 2);
 148         }
 149 }
 150
 151 void idle(void)
 152 {
 153         glutPostRedisplay();
 154 }
 155
 156 void reshape(int x, int y)
 157 {
 158         glViewport(0, 0, x, y);
 159
 160         win_width = x;
 161         win_height = y;
 162 }
 163
 164 void keyb(unsigned char key, int x, int y)
 165 {
 166         switch(key) {
 167         case 27:
 168                 exit(0);
 169
 170         case 'w':
 171                 input |= INP_FWD;
 172                 break;
 173         case 's':
 174                 input |= INP_BACK;
 175                 break;
 176         case 'a':
 177                 input |= INP_LEFT;
 178                 break;
 179         case 'd':
 180                 input |= INP_RIGHT;
 181                 break;
 182         case 'q':
 183                 input |= INP_LTURN;
 184                 break;
 185         case 'e':
 186                 input |= INP_RTURN;
 187                 break;
 188
 189         case 'h':
 190                 hfilt ^= 1;
 191                 printf("filtering: height(%s) color(%s)\n", hfilt ? "linear" : "nearest",
 192                                 cfilt ? "linear" : "nearest");
 193                 vox_filter(vox, hfilt, cfilt);
 194                 break;
 195
 196         case 'c':
 197                 cfilt ^= 1;
 198                 vox_filter(vox, hfilt, cfilt);
 199                 printf("filtering: height(%s) color(%s)\n", hfilt ? "linear" : "nearest",
 200                                 cfilt ? "linear" : "nearest");
 201                 break;
 202
 203         default:
 204                 break;
 205         }
 206 }
 207
 208 void keyb_up(unsigned char key, int x, int y)
 209 {
 210         switch(key) {
 211         case 'w':
 212                 input &= ~INP_FWD;
 213                 break;
 214         case 's':
 215                 input &= ~INP_BACK;
 216                 break;
 217         case 'a':
 218                 input &= ~INP_LEFT;
 219                 break;
 220         case 'd':
 221                 input &= ~INP_RIGHT;
 222                 break;
 223         case 'q':
 224                 input &= ~INP_LTURN;
 225                 break;
 226         case 'e':
 227                 input &= ~INP_RTURN;
 228                 break;
 229
 230         default:
 231                 break;
 232         }
 233 }
 234
 235 void mouse(int bn, int st, int x, int y)
 236 {
 237         int bidx = bn - GLUT_LEFT_BUTTON;
 238
 239         if(bidx < 3) {
 240                 mbstate[bidx] = st == GLUT_DOWN;
 241         }
 242         mouse_x = x;
 243         mouse_y = y;
 244
 245         if(st == GLUT_DOWN) {
 246                 glutSetCursor(GLUT_CURSOR_NONE);
 247         } else {
 248                 glutSetCursor(GLUT_CURSOR_LEFT_ARROW);
 249         }
 250 }
 251
 252 void motion(int x, int y)
 253 {
 254         int dx = x - mouse_x;
 255         int dy = y - mouse_y;
 256         mouse_x = x;
 257         mouse_y = y;
 258
 259         if(mwarp) {
 260                 mwarp = 0;
 261                 return;
 262         }
 263         if(!(dx | dy)) return;
 264
 265         if(mbstate[0]) {
 266                 angle -= dx << 6;
 267         }
 268 }