git.mutantstargoat.com Git - raydungeon/blob - src/scr_game.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <math.h>
   4 #include "opengl.h"
   5 #include "cgmath/cgmath.h"
   6 #include "game.h"
   7 #include "sdr.h"
   8 #include "level.h"
   9 #include "util.h"
  10
  11 static int ginit(void);
  12 static void gdestroy(void);
  13 static int gstart(void);
  14 static void gstop(void);
  15 static void gdisplay(void);
  16 static void greshape(int x, int y);
  17 static void gkeyb(int key, int press);
  18 static void gmouse(int bn, int press, int x, int y);
  19 static void gmotion(int x, int y);
  20
  21 struct game_screen scr_game = {
  22         "game",
  23         ginit, gdestroy,
  24         gstart, gstop,
  25         gdisplay, greshape,
  26         gkeyb, gmouse, gmotion
  27 };
  28
  29 static struct level *lvl;
  30
  31 static float proj_mat[16], view_mat[16];
  32
  33 static float cam_theta, cam_phi = 20, cam_dist = 10;
  34 static cgm_vec3 cam_pan;
  35
  36 static unsigned int sdr;
  37
  38
  39 static int ginit(void)
  40 {
  41         if(!(sdr = create_program_load("sdr/raydungeon.v.glsl", "sdr/raydungeon.p.glsl"))) {
  42                 return -1;
  43         }
  44         return 0;
  45 }
  46
  47 static void gdestroy(void)
  48 {
  49         free_program(sdr);
  50 }
  51
  52 static int gstart(void)
  53 {
  54         lvl = malloc_nf(sizeof *lvl);
  55         init_level(lvl);
  56         if(load_level(lvl, "data/test.lvl") == -1) {
  57                 return -1;
  58         }
  59         cam_pan.x = -(lvl->xsz / 2.0f) * lvl->scale;
  60         cam_pan.y = 0;
  61         cam_pan.z = -(lvl->ysz / 2.0f) * lvl->scale;
  62         return 0;
  63 }
  64
  65 static void gstop(void)
  66 {
  67         destroy_level(lvl);
  68         free(lvl);
  69 }
  70
  71 static void gdisplay(void)
  72 {
  73         int i, j;
  74         float x, y;
  75         struct level_cell *cell;
  76
  77         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  78
  79         cgm_mtranslation(view_mat, 0, 0, -cam_dist);
  80         cgm_mprerotate_x(view_mat, cam_phi);
  81         cgm_mprerotate_y(view_mat, cam_theta);
  82         cgm_mpretranslate(view_mat, cam_pan.x, cam_pan.y, cam_pan.z);
  83         glMatrixMode(GL_MODELVIEW);
  84         glLoadMatrixf(view_mat);
  85
  86         glUseProgram(sdr);
  87
  88         glDepthMask(0);
  89         glBegin(GL_TRIANGLES);
  90         glTexCoord2f(0, 0); glVertex2f(-1, -1);
  91         glTexCoord2f(2, 0); glVertex2f(4, -1);
  92         glTexCoord2f(0, 2); glVertex2f(-1, 4);
  93         glEnd();
  94         glDepthMask(1);
  95
  96         glUseProgram(0);
  97
  98
  99         cell = lvl->cells;
 100         glBegin(GL_QUADS);
 101         glColor3f(1, 1, 1);
 102         glNormal3f(0, 1, 0);
 103         for(i=0; i<lvl->ysz; i++) {
 104                 y = (float)i * lvl->scale;
 105                 for(j=0; j<lvl->xsz; j++) {
 106                         x = (float)j * lvl->scale;
 107                         if(cell->type) {
 108                                 glVertex3f(x - 0.48, -1, y - 0.48);
 109                                 glVertex3f(x + 0.48, -1, y - 0.48);
 110                                 glVertex3f(x + 0.48, -1, y + 0.48);
 111                                 glVertex3f(x - 0.48, -1, y + 0.48);
 112                         }
 113                         cell++;
 114                 }
 115         }
 116         glEnd();
 117 }
 118
 119 static void greshape(int x, int y)
 120 {
 121         cgm_mperspective(proj_mat, cgm_deg_to_rad(60), win_aspect, 0.5, 500.0);
 122         glMatrixMode(GL_PROJECTION);
 123         glLoadMatrixf(proj_mat);
 124 }
 125
 126 static void gkeyb(int key, int press)
 127 {
 128         if(press) {
 129                 switch(key) {
 130                 case '`':
 131                         if(!fullscr) {
 132                                 game_grabmouse(-1);     /* toggle */
 133                         }
 134                         break;
 135
 136                 default:
 137                         break;
 138                 }
 139         }
 140 }
 141
 142 static void gmouse(int bn, int press, int x, int y)
 143 {
 144 }
 145
 146 static void gmotion(int x, int y)
 147 {
 148         int dx = x - mouse_x;
 149         int dy = y - mouse_y;
 150
 151         if(!(dx | dy)) return;
 152
 153         if(mouse_state[0]) {
 154                 cam_theta += dx * 0.02;
 155                 cam_phi += dy * 0.02;
 156                 if(cam_phi < -M_PI/2) cam_phi = -M_PI/2;
 157                 if(cam_phi > M_PI/2) cam_phi = M_PI/2;
 158         }
 159         if(mouse_state[1]) {
 160                 float up[3], right[3];
 161
 162                 up[0] = -sin(cam_theta) * sin(cam_phi);
 163                 up[1] = -cos(cam_phi);
 164                 up[2] = cos(cam_theta) * sin(cam_phi);
 165                 right[0] = cos(cam_theta);
 166                 right[1] = 0;
 167                 right[2] = sin(cam_theta);
 168
 169                 cam_pan.x += (right[0] * dx + up[0] * dy) * 0.01;
 170                 cam_pan.y += up[1] * dy * 0.01;
 171                 cam_pan.z += (right[2] * dx + up[2] * dy) * 0.01;
 172         }
 173         if(mouse_state[2]) {
 174                 cam_dist += dy * 0.01;
 175                 if(cam_dist < 0) cam_dist = 0;
 176         }
 177 }