#include <stdlib.h>
#include <math.h>
#include <imago2.h>
+#include "tpool.h"
#include "tunnel.h"
-static int xsz, ysz;
+#define TEX_FNAME "data/grid.png"
+#define TEX_USCALE 4
+#define TEX_VSCALE 2
+
+#define USCALE 2
+#define VSCALE 1
+
+extern unsigned long time_msec;
+
+static void draw_tunnel_range(unsigned short *pixels, int starty, int num_lines);
+static int count_bits(unsigned int x);
+static int count_zeros(unsigned int x);
+
+static int xsz, ysz, vxsz, vysz;
static unsigned int *tunnel_map;
+static unsigned char *tunnel_fog;
+
+static int tex_xsz, tex_ysz;
+static unsigned int *tex_pixels;
+static int tex_xshift, tex_yshift;
+static unsigned int tex_xmask, tex_ymask;
+
+static struct thread_pool *tpool;
int init_tunnel(int x, int y)
{
- int i, j;
+ int i, j, n;
unsigned int *tmap;
+ unsigned char *fog;
+ float aspect = (float)x / (float)y;
xsz = x;
ysz = y;
+ vxsz = xsz / USCALE;
+ vysz = ysz / VSCALE;
- printf("precalculating tunnel map...\n");
-
- if(!(tunnel_map = malloc(xsz * ysz * sizeof *tunnel_map))) {
+ if(!(tunnel_map = malloc(vxsz * vysz * sizeof *tunnel_map))) {
fprintf(stderr, "failed to allocate tunnel map\n");
return -1;
}
+ if(!(tunnel_fog = malloc(vxsz * vysz))) {
+ fprintf(stderr, "failed to allocate tunnel fog map\n");
+ return -1;
+ }
+
tmap = tunnel_map;
+ fog = tunnel_fog;
- for(i=0; i<ysz; i++) {
- float y = 2.0 * (float)i / (float)ysz - 0.5;
- for(j=0; j<xsz; j++) {
- float x = 2.0 * (float)j / (float)xsz - 0.5;
+ for(i=0; i<vysz; i++) {
+ float y = 2.0 * (float)i / (float)vysz - 1.0;
+ for(j=0; j<vxsz; j++) {
+ float x = aspect * (2.0 * (float)j / (float)vxsz - 1.0);
float tu = atan2(y, x) / M_PI * 0.5 + 0.5;
- float tv = sqrt(x*x + y*y);
+ float d = sqrt(x * x + y * y);
+ float tv = d == 0.0 ? 0.0 : 1.0 / d;
+
+ int tx = (int)(tu * 65535.0 * TEX_USCALE) & 0xffff;
+ int ty = (int)(tv * 65535.0 * TEX_VSCALE) & 0xffff;
- int tx = (int)(tu * 65535.0) & 0xffff;
- int ty = (int)(tv * 65535.0) & 0xffff;
+ int f = (int)(d * 95.0);
*tmap++ = (tx << 16) | ty;
+ *fog++ = f > 255 ? 255 : f;
}
}
+ if(!(tex_pixels = img_load_pixels(TEX_FNAME, &tex_xsz, &tex_ysz, IMG_FMT_RGBA32))) {
+ fprintf(stderr, "failed to load image " TEX_FNAME "\n");
+ return -1;
+ }
+ if((count_bits(tex_xsz) | count_bits(tex_ysz)) != 1) {
+ fprintf(stderr, "non-pow2 image (%dx%d)\n", tex_xsz, tex_ysz);
+ return -1;
+ }
+
+ n = count_zeros(tex_xsz);
+ for(i=0; i<n; i++) {
+ tex_xmask |= 1 << i;
+ }
+ tex_xshift = n;
+
+ n = count_zeros(tex_ysz);
+ for(i=0; i<n; i++) {
+ tex_ymask |= 1 << i;
+ }
+ tex_yshift = n;
+
+ if(!(tpool = tpool_create(0))) {
+ fprintf(stderr, "failed to create thread pool\n");
+ return -1;
+ }
+
return 0;
}
void destroy_tunnel(void)
{
+ tpool_destroy(tpool);
free(tunnel_map);
+ free(tunnel_fog);
+}
+
+#define NUM_WORK_ITEMS 32
+
+static struct work {
+ unsigned short *pixels;
+ int starty, num_lines;
+} work[NUM_WORK_ITEMS];
+
+static void work_func(void *cls)
+{
+ struct work *w = (struct work*)cls;
+ draw_tunnel_range(w->pixels, w->starty, w->num_lines);
}
void draw_tunnel(unsigned short *pixels)
{
- int i, j, r, g, b;
- unsigned int *tmap = tunnel_map;
+ int i, num_lines = vysz / NUM_WORK_ITEMS;
+ for(i=0; i<NUM_WORK_ITEMS; i++) {
+ work[i].pixels = pixels;
+ work[i].starty = i * num_lines;
+ work[i].num_lines = num_lines;
+
+ tpool_enqueue(tpool, work + i, work_func, 0);
+ }
+ tpool_wait(tpool);
+}
+
+#define PACK_RGB16(r, g, b) \
+ (((((r) >> 3) & 0x1f) << 11) | ((((g) >> 2) & 0x3f) << 5) | ((b) & 0x1f))
+
+static void draw_tunnel_range(unsigned short *pixels, int starty, int num_lines)
+{
+ int i, j, k, r, g, b;
+ unsigned int *tmap = tunnel_map + starty * vxsz;
+ unsigned char *fog = tunnel_fog + starty * vxsz;
+
+ long toffs = time_msec / 4;
+ pixels += starty * xsz * VSCALE;
- for(i=0; i<ysz; i++) {
- for(j=0; j<xsz; j++) {
- unsigned int tx = (*tmap >> 16) & 0xffff;
- unsigned int ty = *tmap & 0xffff;
+ for(i=0; i<num_lines; i++) {
+ for(j=0; j<vxsz; j++) {
+ unsigned short *ptr;
+ unsigned int col;
+ unsigned int tx = (((*tmap >> 16) & 0xffff) << tex_xshift) >> 16;
+ unsigned int ty = ((*tmap & 0xffff) << tex_yshift) >> 16;
++tmap;
- r = tx >> 8;
- g = ty >> 8;
+ tx += toffs;
+ ty += toffs << 1;
+
+ tx &= tex_xmask;
+ ty &= tex_ymask;
- *pixels++ = ((((r >> 3) & 0x1f) << 11) |
- (((g >> 2) & 0x3f) << 5));/* |
- ((b >> 3) & 0x1f));*/
+ col = tex_pixels[(ty << tex_xshift) + tx];
+ r = col & 0xff;
+ g = (col >> 8) & 0xff;
+ b = (col >> 16) & 0xff;
+
+ r = (r * *fog) >> 8;
+ g = (g * *fog) >> 8;
+ b = (b * *fog) >> 8;
+ ++fog;
+
+ col = ((((r >> 3) & 0x1f) << 11) | (((g >> 2) & 0x3f) << 5) | ((b >> 3) & 0x1f));
+
+ ptr = pixels;
+ for(k=0; k<VSCALE; k++) {
+ switch(USCALE) {
+ case 4:
+ ptr[3] = col;
+ case 3:
+ ptr[2] = col;
+ case 2:
+ ptr[1] = col;
+ case 1:
+ *ptr = col;
+ }
+ ptr += xsz;
+ }
+ pixels += USCALE;
}
+ pixels += xsz * (VSCALE - 1);
+ }
+}
+
+static int count_bits(unsigned int x)
+{
+ int i, nbits = 0;
+ for(i=0; i<32; i++) {
+ if(x & 1) ++nbits;
+ x >>= 1;
+ }
+ return nbits;
+}
+
+static int count_zeros(unsigned int x)
+{
+ int i, num = 0;
+ for(i=0; i<32; i++) {
+ if(x & 1) break;
+ ++num;
+ x >>= 1;
}
+ return num;
}
projects / fbgfx / blobdiff