draw
};
-static cgm_vec3 raydir[120][160];
+struct tile {
+ int x, y;
+ uint16_t *fbptr;
+};
+
+#define TILESZ 16
+#define NUM_TILES ((320 / TILESZ) * (240 / TILESZ))
+
+static cgm_vec3 raydir[240][320];
+static struct tile tiles[NUM_TILES];
static struct rtscene scn;
struct screen *raytrace_screen(void)
static int init(void)
{
- int i, j;
+ int i, j, k;
float z = 1.0f / tan(cgm_deg_to_rad(25.0f));
+ struct tile *tptr = tiles;
- for(i=0; i<120; i++) {
+ for(i=0; i<240; i++) {
cgm_vec3 *vptr = raydir[i];
- float y = 1.0f - (float)i / 60.0f;
- for(j=0; j<160; j++) {
- vptr->x = ((float)j / 80.0f - 1.0f) * 1.333333f;
+ float y = 1.0f - (float)i / 120.0f;
+ for(j=0; j<320; j++) {
+ vptr->x = ((float)j / 160.0f - 1.0f) * 1.333333f;
vptr->y = y;
vptr->z = z;
vptr++;
+
+ if(((j & (TILESZ-1)) | (i & (TILESZ-1))) == 0) {
+ tptr->x = j;
+ tptr->y = i;
+ tptr->fbptr = fb_pixels + i * 320 + j;
+ tptr++;
+ }
}
}
{
}
-static void draw(void)
+static uint16_t INLINE rend_pixel(int x, int y)
{
- int i, j, r, g, b;
- uint16_t pix, *fbptr = fb_pixels;
-
- for(i=0; i<120; i++) {
- for(j=0; j<160; j++) {
- cgm_ray ray;
- cgm_vec3 col;
- ray.dir = raydir[i][j];
- cgm_vcons(&ray.origin, 0, 0, -5);
-
- if(ray_trace(&ray, &scn, 0, &col)) {
- r = cround64(col.x * 255.0f);
- g = cround64(col.y * 255.0f);
- b = cround64(col.z * 255.0f);
- if(r > 255) r = 255;
- if(g > 255) g = 255;
- if(b > 255) b = 255;
- pix = PACK_RGB16(r, g, b);
- } else {
- pix = 0;
- }
- fbptr[0] = fbptr[1] = fbptr[320] = fbptr[321] = pix;
- fbptr += 2;
+ int r, g, b;
+ cgm_ray ray;
+ cgm_vec3 col;
+
+ ray.dir = raydir[y][x];
+ cgm_vcons(&ray.origin, 0, 0, -5);
+
+ if(ray_trace(&ray, &scn, 0, &col)) {
+ r = cround64(col.x * 255.0f);
+ g = cround64(col.y * 255.0f);
+ b = cround64(col.z * 255.0f);
+ if(r > 255) r = 255;
+ if(g > 255) g = 255;
+ if(b > 255) b = 255;
+ return PACK_RGB16(r, g, b);
+ }
+ return 0;
+}
+
+#define CMPMASK 0xe79c
+static void rend_tile(uint16_t *fbptr, int x0, int y0, int tsz, int valid)
+{
+ uint16_t *cptr[4];
+ uint16_t cpix[4], tmp;
+ uint32_t pp0, pp1, pp2, pp3, *fb32;
+ int i, x1, y1, offs;
+
+ fb32 = (uint32_t*)fbptr;
+
+ if(tsz <= 2) {
+ switch(valid) {
+ case 0:
+ fbptr[1] = fbptr[320] = fbptr[321] = *fbptr;
+ break;
+ case 1:
+ fbptr[0] = fbptr[320] = fbptr[321] = fbptr[1];
+ break;
+ case 2:
+ fbptr[0] = fbptr[1] = fbptr[321] = fbptr[320];
+ break;
+ case 3:
+ fbptr[0] = fbptr[1] = fbptr[320] = fbptr[321];
+ break;
+ default:
+ printf("valid = %d\n", valid);
+ fbptr[0] = fbptr[1] = fbptr[320] = fbptr[321] = 0xff00;
+ }
+ return;
+ }
+
+ offs = tsz - 1;
+ x1 = x0 + offs;
+ y1 = y0 + offs;
+
+ cptr[0] = fbptr;
+ cptr[1] = fbptr + tsz - 1;
+ cptr[2] = fbptr + (offs << 8) + (offs << 6);
+ cptr[3] = cptr[2] + tsz - 1;
+
+ cpix[0] = valid == 0 ? *cptr[0] : rend_pixel(x0, y0);
+ cpix[1] = valid == 1 ? *cptr[1] : rend_pixel(x1, y0);
+ cpix[2] = valid == 2 ? *cptr[2] : rend_pixel(x0, y1);
+ cpix[3] = valid == 3 ? *cptr[3] : rend_pixel(x1, y1);
+
+ tmp = cpix[0] & CMPMASK;
+ if((cpix[1] & CMPMASK) != tmp) goto subdiv;
+ if((cpix[2] & CMPMASK) != tmp) goto subdiv;
+ if((cpix[3] & CMPMASK) != tmp) goto subdiv;
+
+ pp0 = cpix[0] | ((uint32_t)cpix[0] << 16);
+ pp1 = cpix[1] | ((uint32_t)cpix[1] << 16);
+ pp2 = cpix[2] | ((uint32_t)cpix[2] << 16);
+ pp3 = cpix[3] | ((uint32_t)cpix[3] << 16);
+
+ switch(tsz) {
+ case 2:
+#ifdef SUBDBG
+ pp0 = 0x18ff;
+#endif
+ fb32[0] = fb32[160] = pp0;
+ break;
+ case 4:
+#ifdef SUBDBG
+ pp0 = pp1 = pp2 = pp3 = 0x03800380;
+#endif
+ fb32[0] = fb32[160] = pp0;
+ fb32[1] = fb32[161] = pp1;
+ fb32[320] = fb32[480] = pp2;
+ fb32[321] = fb32[481] = pp3;
+ break;
+ case 8:
+#ifdef SUBDBG
+ pp1 = pp0 = pp2 = pp3 = 0xe00fe00f;
+#endif
+ fb32[0] = fb32[1] = pp0; fb32[2] = fb32[3] = pp1;
+ fb32[160] = fb32[161] = pp0; fb32[162] = fb32[163] = pp1;
+ fb32[320] = fb32[321] = pp0; fb32[322] = fb32[323] = pp1;
+ fb32[480] = fb32[481] = pp0; fb32[482] = fb32[483] = pp1;
+ fb32[640] = fb32[641] = pp2; fb32[642] = fb32[643] = pp3;
+ fb32[800] = fb32[801] = pp2; fb32[802] = fb32[803] = pp3;
+ fb32[960] = fb32[961] = pp2; fb32[962] = fb32[963] = pp3;
+ fb32[1120] = fb32[1121] = pp2; fb32[1122] = fb32[1123] = pp3;
+ break;
+
+ case 16:
+#ifdef SUBDBG
+ pp0 = 0xff00ff00;
+#endif
+ for(i=0; i<4; i++) {
+ memset16(fbptr, pp0, 16); fbptr += 320;
+ memset16(fbptr, pp0, 16); fbptr += 320;
+ memset16(fbptr, pp0, 16); fbptr += 320;
+ memset16(fbptr, pp0, 16); fbptr += 320;
}
- fbptr += 320;
+ break;
+ }
+ return;
+
+subdiv:
+ *cptr[0] = cpix[0];
+ *cptr[1] = cpix[1];
+ *cptr[2] = cpix[2];
+ *cptr[3] = cpix[3];
+
+ tsz >>= 1;
+ rend_tile(fbptr, x0, y0, tsz, 0);
+ rend_tile(fbptr + tsz, x0 + tsz, y0, tsz, 1);
+ fbptr += (tsz << 8) + (tsz << 6);
+ y0 += tsz;
+ rend_tile(fbptr, x0, y0, tsz, 2);
+ rend_tile(fbptr + tsz, x0 + tsz, y0, tsz, 3);
+}
+
+static void draw(void)
+{
+ int i, j, xbound, ybound;
+ uint16_t *fbptr;
+ struct tile *tile;
+
+ tile = tiles;
+ for(i=0; i<NUM_TILES; i++) {
+ rend_tile(tile->fbptr, tile->x, tile->y, TILESZ, -1);
+ tile++;
}
swap_buffers(0);
projects / dosdemo / blobdiff