git.mutantstargoat.com Git - dosdemo/blob - src/scr/polytest.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <math.h>
   5 #include "screen.h"
   6 #include "demo.h"
   7 #include "3dgfx.h"
   8 #include "gfxutil.h"
   9 #include "polyfill.h"   /* just for struct pimage */
  10 #include "cfgopt.h"
  11 #include "mesh.h"
  12 #include "bsptree.h"
  13
  14 static int init(void);
  15 static void destroy(void);
  16 static void start(long trans_time);
  17 static void draw(void);
  18 static void draw_lowres_raster(void);
  19 static void keypress(int key);
  20 static int gen_texture(struct pimage *img, int xsz, int ysz);
  21
  22 static struct screen scr = {
  23         "polytest",
  24         init,
  25         destroy,
  26         start, 0,
  27         draw,
  28         keypress
  29 };
  30
  31 static float cam_theta, cam_phi = 25;
  32 static float cam_dist = 3;
  33 static struct g3d_mesh cube, torus;
  34 static struct bsptree torus_bsp;
  35
  36 static struct pimage tex;
  37
  38 static int use_bsp = 0;
  39
  40 #define LOWRES_SCALE    10
  41 static uint16_t *lowres_pixels;
  42 static int lowres_width, lowres_height;
  43
  44 struct screen *polytest_screen(void)
  45 {
  46         return &scr;
  47 }
  48
  49 static int init(void)
  50 {
  51         int i;
  52
  53         gen_cube_mesh(&cube, 1.0, 0);
  54         gen_torus_mesh(&torus, 1.0, 0.25, 24, 12);
  55         /* scale texcoords */
  56         for(i=0; i<torus.vcount; i++) {
  57                 torus.varr[i].u *= 4.0;
  58                 torus.varr[i].v *= 2.0;
  59         }
  60
  61         /*
  62         init_bsp(&torus_bsp);
  63         if(bsp_add_mesh(&torus_bsp, &torus) == -1) {
  64                 fprintf(stderr, "failed to construct torus BSP tree\n");
  65                 return -1;
  66         }
  67         */
  68
  69         gen_texture(&tex, 128, 128);
  70
  71 #ifdef DEBUG_POLYFILL
  72         lowres_width = fb_width / LOWRES_SCALE;
  73         lowres_height = fb_height / LOWRES_SCALE;
  74         lowres_pixels = malloc(lowres_width * lowres_height * 2);
  75         scr.draw = draw_debug;
  76 #endif
  77
  78         return 0;
  79 }
  80
  81 static void destroy(void)
  82 {
  83         free(lowres_pixels);
  84         free(cube.varr);
  85         free(torus.varr);
  86         free(torus.iarr);
  87         /*
  88         destroy_bsp(&torus_bsp);
  89         */
  90 }
  91
  92 static void start(long trans_time)
  93 {
  94         g3d_matrix_mode(G3D_PROJECTION);
  95         g3d_load_identity();
  96         g3d_perspective(50.0, 1.3333333, 0.5, 100.0);
  97
  98         g3d_enable(G3D_CULL_FACE);
  99         g3d_enable(G3D_LIGHTING);
 100         g3d_enable(G3D_LIGHT0);
 101
 102         g3d_polygon_mode(G3D_GOURAUD);
 103         g3d_enable(G3D_TEXTURE_2D);
 104 }
 105
 106 static void update(void)
 107 {
 108         mouse_orbit_update(&cam_theta, &cam_phi, &cam_dist);
 109 }
 110
 111
 112 static void draw(void)
 113 {
 114         float vdir[3];
 115         const float *mat;
 116
 117         update();
 118
 119         memset(fb_pixels, 0, fb_width * fb_height * 2);
 120
 121         g3d_matrix_mode(G3D_MODELVIEW);
 122         g3d_load_identity();
 123         g3d_translate(0, 0, -cam_dist);
 124         if(opt.sball) {
 125                 g3d_mult_matrix(sball_matrix);
 126         } else {
 127                 g3d_rotate(cam_phi, 1, 0, 0);
 128                 g3d_rotate(cam_theta, 0, 1, 0);
 129         }
 130
 131         g3d_light_pos(0, -10, 10, 20);
 132
 133         g3d_mtl_diffuse(0.4, 0.7, 1.0);
 134         g3d_set_texture(tex.width, tex.height, tex.pixels);
 135
 136         if(use_bsp) {
 137                 /* calc world-space view direction */
 138                 mat = g3d_get_matrix(G3D_MODELVIEW, 0);
 139                 /* transform (0, 0, -1) with transpose(mat3x3) */
 140                 vdir[0] = -mat[2];
 141                 vdir[1] = -mat[6];
 142                 vdir[2] = -mat[10];
 143
 144                 draw_bsp(&torus_bsp, vdir[0], vdir[1], vdir[2]);
 145         } else {
 146                 zsort_mesh(&torus);
 147                 draw_mesh(&torus);
 148         }
 149
 150         /*draw_mesh(&cube);*/
 151         swap_buffers(fb_pixels);
 152 }
 153
 154 static void draw_debug(void)
 155 {
 156         update();
 157
 158         memset(lowres_pixels, 0, lowres_width * lowres_height * 2);
 159
 160         g3d_matrix_mode(G3D_MODELVIEW);
 161         g3d_load_identity();
 162         g3d_translate(0, 0, -cam_dist);
 163         g3d_rotate(cam_phi, 1, 0, 0);
 164         g3d_rotate(cam_theta, 0, 1, 0);
 165
 166         g3d_framebuffer(lowres_width, lowres_height, lowres_pixels);
 167         /*zsort(&torus);*/
 168         draw_mesh(&cube);
 169
 170         draw_lowres_raster();
 171
 172
 173         g3d_framebuffer(fb_width, fb_height, fb_pixels);
 174
 175         g3d_polygon_mode(G3D_WIRE);
 176         draw_mesh(&cube);
 177         g3d_polygon_mode(G3D_FLAT);
 178
 179         swap_buffers(fb_pixels);
 180 }
 181
 182
 183 static void draw_huge_pixel(uint16_t *dest, int dest_width, uint16_t color)
 184 {
 185         int i, j;
 186         uint16_t grid_color = PACK_RGB16(127, 127, 127);
 187
 188         for(i=0; i<LOWRES_SCALE; i++) {
 189                 for(j=0; j<LOWRES_SCALE; j++) {
 190                         dest[j] = i == 0 || j == 0 ? grid_color : color;
 191                 }
 192                 dest += dest_width;
 193         }
 194 }
 195
 196 static void draw_lowres_raster(void)
 197 {
 198         int i, j;
 199         uint16_t *sptr = lowres_pixels;
 200         uint16_t *dptr = fb_pixels;
 201
 202         for(i=0; i<lowres_height; i++) {
 203                 for(j=0; j<lowres_width; j++) {
 204                         draw_huge_pixel(dptr, fb_width, *sptr++);
 205                         dptr += LOWRES_SCALE;
 206                 }
 207                 dptr += fb_width * LOWRES_SCALE - fb_width;
 208         }
 209 }
 210
 211 static void keypress(int key)
 212 {
 213         switch(key) {
 214         case 'b':
 215                 use_bsp = !use_bsp;
 216                 printf("drawing with %s\n", use_bsp ? "BSP tree" : "z-sorting");
 217                 break;
 218         }
 219 }
 220
 221 static int gen_texture(struct pimage *img, int xsz, int ysz)
 222 {
 223         int i, j;
 224         uint16_t *pix;
 225
 226         if(!(img->pixels = malloc(xsz * ysz * sizeof *pix))) {
 227                 return -1;
 228         }
 229         pix = img->pixels;
 230
 231         for(i=0; i<ysz; i++) {
 232                 for(j=0; j<xsz; j++) {
 233                         int val = i ^ j;
 234
 235                         *pix++ = PACK_RGB16(val, val, val);
 236                 }
 237         }
 238
 239         img->width = xsz;
 240         img->height = ysz;
 241         return 0;
 242 }