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 #include "util.h"
  14
  15 static int init(void);
  16 static void destroy(void);
  17 static void start(long trans_time);
  18 static void draw(void);
  19 static void draw_lowres_raster(void);
  20 static void keypress(int key);
  21 static int gen_texture(struct pimage *img, int xsz, int ysz);
  22
  23 static struct screen scr = {
  24         "polytest",
  25         init,
  26         destroy,
  27         start, 0,
  28         draw,
  29         keypress
  30 };
  31
  32 static float cam_theta, cam_phi = 25;
  33 static float cam_dist = 3;
  34 static struct g3d_mesh cube, torus;
  35 static struct bsptree torus_bsp;
  36
  37 static struct pimage tex;
  38
  39 static int use_bsp = 0;
  40
  41 #define LOWRES_SCALE    10
  42 static uint16_t *lowres_pixels;
  43 static int lowres_width, lowres_height;
  44
  45 struct screen *polytest_screen(void)
  46 {
  47         return &scr;
  48 }
  49
  50 static int init(void)
  51 {
  52         int i;
  53
  54         gen_cube_mesh(&cube, 1.0, 0);
  55         gen_torus_mesh(&torus, 1.0, 0.25, 24, 12);
  56         /* scale texcoords */
  57         for(i=0; i<torus.vcount; i++) {
  58                 torus.varr[i].u *= 4.0;
  59                 torus.varr[i].v *= 2.0;
  60         }
  61
  62         /*
  63         init_bsp(&torus_bsp);
  64         if(bsp_add_mesh(&torus_bsp, &torus) == -1) {
  65                 fprintf(stderr, "failed to construct torus BSP tree\n");
  66                 return -1;
  67         }
  68         */
  69
  70         gen_texture(&tex, 64, 64);
  71
  72 #ifdef DEBUG_POLYFILL
  73         lowres_width = FB_WIDTH / LOWRES_SCALE;
  74         lowres_height = FB_HEIGHT / LOWRES_SCALE;
  75         lowres_pixels = malloc(lowres_width * lowres_height * 2);
  76         scr.draw = draw_debug;
  77 #endif
  78
  79         return 0;
  80 }
  81
  82 static void destroy(void)
  83 {
  84         free(lowres_pixels);
  85         free(cube.varr);
  86         free(torus.varr);
  87         free(torus.iarr);
  88         /*
  89         destroy_bsp(&torus_bsp);
  90         */
  91 }
  92
  93 static void start(long trans_time)
  94 {
  95         g3d_matrix_mode(G3D_PROJECTION);
  96         g3d_load_identity();
  97         g3d_perspective(50.0, 1.3333333, 0.5, 100.0);
  98
  99         g3d_enable(G3D_CULL_FACE);
 100         g3d_enable(G3D_LIGHTING);
 101         g3d_enable(G3D_LIGHT0);
 102
 103         g3d_polygon_mode(G3D_GOURAUD);
 104         g3d_enable(G3D_TEXTURE_2D);
 105
 106         g3d_enable(G3D_DEPTH_TEST);
 107 }
 108
 109 static void update(void)
 110 {
 111         mouse_orbit_update(&cam_theta, &cam_phi, &cam_dist);
 112 }
 113
 114
 115 static void draw(void)
 116 {
 117         float vdir[3];
 118         const float *mat;
 119
 120         update();
 121
 122         //memset16(fb_pixels, PACK_RGB16(20, 30, 50), FB_WIDTH * FB_HEIGHT);
 123         g3d_clear_color(20, 30, 50);
 124         g3d_clear(G3D_COLOR_BUFFER_BIT | G3D_DEPTH_BUFFER_BIT);
 125
 126         g3d_matrix_mode(G3D_MODELVIEW);
 127         g3d_load_identity();
 128         g3d_translate(0, 0, -cam_dist);
 129         if(opt.sball) {
 130                 g3d_mult_matrix(sball_matrix);
 131         } else {
 132                 g3d_rotate(cam_phi, 1, 0, 0);
 133                 g3d_rotate(cam_theta, 0, 1, 0);
 134         }
 135
 136         g3d_light_dir(0, -10, 10, 10);
 137         g3d_mtl_diffuse(1.0, 1.0, 1.0);
 138         g3d_set_texture(tex.width, tex.height, tex.pixels);
 139
 140         if(use_bsp) {
 141                 /* calc world-space view direction */
 142                 mat = g3d_get_matrix(G3D_MODELVIEW, 0);
 143                 /* transform (0, 0, -1) with transpose(mat3x3) */
 144                 vdir[0] = -mat[2];
 145                 vdir[1] = -mat[6];
 146                 vdir[2] = -mat[10];
 147
 148                 draw_bsp(&torus_bsp, vdir[0], vdir[1], vdir[2]);
 149         } else {
 150                 //zsort_mesh(&torus);
 151                 draw_mesh(&torus);
 152         }
 153
 154         /*{
 155                 int i;
 156                 for(i=0; i<FB_WIDTH*FB_HEIGHT; i++) {
 157                         unsigned int z = pfill_zbuf[i];
 158                         fb_pixels[i] = z;
 159                 }
 160         }*/
 161
 162         /*draw_mesh(&cube);*/
 163         swap_buffers(fb_pixels);
 164 }
 165
 166 static void draw_debug(void)
 167 {
 168         update();
 169
 170         memset(lowres_pixels, 0, lowres_width * lowres_height * 2);
 171
 172         g3d_matrix_mode(G3D_MODELVIEW);
 173         g3d_load_identity();
 174         g3d_translate(0, 0, -cam_dist);
 175         g3d_rotate(cam_phi, 1, 0, 0);
 176         g3d_rotate(cam_theta, 0, 1, 0);
 177
 178         g3d_framebuffer(lowres_width, lowres_height, lowres_pixels);
 179         /*zsort(&torus);*/
 180         draw_mesh(&cube);
 181
 182         draw_lowres_raster();
 183
 184
 185         g3d_framebuffer(FB_WIDTH, FB_HEIGHT, fb_pixels);
 186
 187         g3d_polygon_mode(G3D_WIRE);
 188         draw_mesh(&cube);
 189         g3d_polygon_mode(G3D_FLAT);
 190
 191         swap_buffers(fb_pixels);
 192 }
 193
 194
 195 static void draw_huge_pixel(uint16_t *dest, int dest_width, uint16_t color)
 196 {
 197         int i, j;
 198         uint16_t grid_color = PACK_RGB16(127, 127, 127);
 199
 200         for(i=0; i<LOWRES_SCALE; i++) {
 201                 for(j=0; j<LOWRES_SCALE; j++) {
 202                         dest[j] = i == 0 || j == 0 ? grid_color : color;
 203                 }
 204                 dest += dest_width;
 205         }
 206 }
 207
 208 static void draw_lowres_raster(void)
 209 {
 210         int i, j;
 211         uint16_t *sptr = lowres_pixels;
 212         uint16_t *dptr = fb_pixels;
 213
 214         for(i=0; i<lowres_height; i++) {
 215                 for(j=0; j<lowres_width; j++) {
 216                         draw_huge_pixel(dptr, FB_WIDTH, *sptr++);
 217                         dptr += LOWRES_SCALE;
 218                 }
 219                 dptr += FB_WIDTH * LOWRES_SCALE - FB_WIDTH;
 220         }
 221 }
 222
 223 static void keypress(int key)
 224 {
 225         switch(key) {
 226         case 'b':
 227                 use_bsp = !use_bsp;
 228                 printf("drawing with %s\n", use_bsp ? "BSP tree" : "z-sorting");
 229                 break;
 230         }
 231 }
 232
 233 static int gen_texture(struct pimage *img, int xsz, int ysz)
 234 {
 235         int i, j;
 236         uint16_t *pix;
 237
 238         if(!(img->pixels = malloc(xsz * ysz * sizeof *pix))) {
 239                 return -1;
 240         }
 241         pix = img->pixels;
 242
 243         for(i=0; i<ysz; i++) {
 244                 for(j=0; j<xsz; j++) {
 245                         int val = (i << 2) ^ (j << 2);
 246                         uint16_t r = val;
 247                         uint16_t g = val << 1;
 248                         uint16_t b = val << 2;
 249
 250                         *pix++ = PACK_RGB16(r, g, b);
 251                 }
 252         }
 253
 254         img->width = xsz;
 255         img->height = ysz;
 256         return 0;
 257 }