+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include <assert.h>
-#include "imago2.h"
-#include "demo.h"
-#include "screen.h"
-#include "gfxutil.h"
-
-#ifndef M_PI
-#define M_PI 3.1415926535
-#endif
-
-#define VSCALE 1.5
-
-#define TEX_FNAME "data/grid.png"
-#define TEX_USCALE 4
-#define TEX_VSCALE 2
-
-static int init(void);
-static void destroy(void);
-static void start(long trans_time);
-static void stop(long trans_time);
-static void draw(void);
-
-static void draw_tunnel_range(unsigned short *pixels, int xoffs, int yoffs, int starty, int num_lines, long tm);
-static int count_bits(unsigned int x);
-static int count_zeros(unsigned int x);
-
-static struct screen scr = {
- "tunnel",
- init,
- destroy,
- start,
- stop,
- draw
-};
-
-static int xsz, ysz, vxsz, vysz;
-static int pan_width, pan_height;
-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 long trans_start, trans_dur;
-static int trans_dir;
-
-
-struct screen *tunnel_screen(void)
-{
- return &scr;
-}
-
-
-static int init(void)
-{
- int i, j, n;
- unsigned int *tmap;
- unsigned char *fog;
- float aspect = (float)fb_width / (float)fb_height;
-
- xsz = fb_width;
- ysz = fb_height;
- vxsz = xsz * VSCALE;
- vysz = ysz * VSCALE;
-
- pan_width = vxsz - xsz;
- pan_height = vysz - ysz;
-
- 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<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 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 f = (int)(d * 192.0);
-
- *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;
- }
-
- /*tex_pixels = gen_test_image(&tex_xsz, &tex_ysz);*/
-
- 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;
-
- return 0;
-}
-
-static void destroy(void)
-{
- free(tunnel_map);
- free(tunnel_fog);
- img_free_pixels(tex_pixels);
-}
-
-static void start(long trans_time)
-{
- if(trans_time) {
- trans_start = time_msec;
- trans_dur = trans_time;
- trans_dir = 1;
- }
-}
-
-static void stop(long trans_time)
-{
- if(trans_time) {
- trans_start = time_msec;
- trans_dur = trans_time;
- trans_dir = -1;
- }
-}
-
-#define NUM_WORK_ITEMS 8
-
-static void draw(void)
-{
- int i, num_lines = ysz / NUM_WORK_ITEMS;
- int draw_lines = num_lines;
- float t;
- int xoffs, yoffs;
-
- if(trans_dir) {
- long interval = time_msec - trans_start;
- int progr = num_lines * interval / trans_dur;
- if(trans_dir < 0) {
- draw_lines = num_lines - progr - 1;
- } else {
- draw_lines = progr;
- }
- if(progr >= num_lines) {
- trans_dir = 0;
- }
- }
-
- t = time_msec / 10000.0;
- xoffs = (int)(cos(t * 3.0) * pan_width / 2) + pan_width / 2;
- yoffs = (int)(sin(t * 4.0) * pan_height / 2) + pan_height / 2;
-
- for(i=0; i<NUM_WORK_ITEMS; i++) {
- int starty = i * num_lines;
- int resty = starty + draw_lines;
- int rest_lines = num_lines - draw_lines;
- draw_tunnel_range(fb_pixels, xoffs, yoffs, starty, draw_lines, time_msec);
- if(rest_lines) {
- memset(fb_pixels + resty * fb_width, 0, rest_lines * fb_width * 2);
- }
- }
-
- swap_buffers(0);
-}
-
-static void tunnel_color(int *rp, int *gp, int *bp, long toffs, unsigned int tpacked, int fog)
-{
- int r, g, b;
- unsigned int col;
- unsigned int tx = (((tpacked >> 16) & 0xffff) << tex_xshift) >> 16;
- unsigned int ty = ((tpacked & 0xffff) << tex_yshift) >> 16;
- tx += toffs;
- ty += toffs << 1;
-
- tx &= tex_xmask;
- ty &= tex_ymask;
-
- col = tex_pixels[(ty << tex_xshift) + tx];
- r = col & 0xff;
- g = (col >> 8) & 0xff;
- b = (col >> 16) & 0xff;
-
- *rp = (r * fog) >> 8;
- *gp = (g * fog) >> 8;
- *bp = (b * fog) >> 8;
-}
-
-static void draw_tunnel_range(unsigned short *pix, int xoffs, int yoffs, int starty, int num_lines, long tm)
-{
- int i, j;
- unsigned int *tmap = tunnel_map + (starty + yoffs) * vxsz + xoffs;
- unsigned char *fog = tunnel_fog + (starty + yoffs) * vxsz + xoffs;
-
- long toffs = tm / 8;
- unsigned int *pixels = (unsigned int*)pix + starty * (fb_width >> 1);
-
- for(i=0; i<num_lines; i++) {
- for(j=0; j<(xsz>>1); j++) {
- unsigned int col;
- int r, g, b, idx = j << 1;
-
- tunnel_color(&r, &g, &b, toffs, tmap[idx], fog[idx]);
- col = PACK_RGB16(r, g, b);
- tunnel_color(&r, &g, &b, toffs, tmap[idx + 1], fog[idx + 1]);
- col |= PACK_RGB16(r, g, b) << 16;
- *pixels++ = col;
- }
- tmap += vxsz;
- fog += vxsz;
- }
-}
-
-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;
-}
-
-/*
-static unsigned int *gen_test_image(int *wptr, int *hptr)
-{
- int i, j;
- int xsz = 256, ysz = 256;
- unsigned int *pixels, *pix;
-
- if(!(pixels = malloc(xsz * ysz * sizeof *pix))) {
- return 0;
- }
- pix = pixels;
-
- for(i=0; i<ysz; i++) {
- for(j=0; j<xsz; j++) {
- int val = i ^ j;
-
- *pix++ = PACK_RGB32(val, val / 2, val / 4);
- }
- }
-
- *wptr = xsz;
- *hptr = ysz;
- return pixels;
-}
-*/
projects / dosdemo / blobdiff