X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Ftunnel.c;h=221fadcc0624085b7e01f67d292153c202955ca0;hb=HEAD;hp=f4b3984e881d6b325608d393eeb2d13ff3e867f4;hpb=047042f3d08b2eb272256f0e17b2391c85756f49;p=fbgfx

diff --git a/src/tunnel.c b/src/tunnel.c
index f4b3984..e6a53d5 100644
--- a/src/tunnel.c
+++ b/src/tunnel.c
@@ -1,46 +1,86 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <assert.h>
 #include <imago2.h>
+#ifndef NO_THREADS
 #include "tpool.h"
-#include "tunnel.h"
+#endif
+#include "demo.h"
+#include "screen.h"
+
+#define VSCALE	1.5
 
 #define TEX_FNAME	"data/grid.png"
 #define TEX_USCALE	4
 #define TEX_VSCALE	2
 
-#define USCALE	2
-#define VSCALE	1
+#define NUM_WORK_ITEMS	8
+
+static struct work {
+	void *pixels;
+	int starty, num_lines;
+	long tm;
+	int xoffs, yoffs;
+} work[NUM_WORK_ITEMS];
 
-extern unsigned long time_msec;
+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)(void*, int, int);
+static void (*draw_tunnel_range)(void*, int, int, int, int, long);
 
-static void draw_tunnel_range16(void *pixels, int starty, int num_lines);
-static void draw_tunnel_range32(void *pixels, int starty, int num_lines);
+static void draw_tunnel_range16(void *pixels, int xoffs, int yoffs, int starty, int num_lines, long tm);
+static void draw_tunnel_range32(void *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
+};
+
+struct tunmap {
+	int u, v;
+	unsigned char fog;
+};
+
 static int xsz, ysz, vxsz, vysz;
-static unsigned int *tunnel_map;
-static unsigned char *tunnel_fog;
+static int pan_width, pan_height;
+static struct tunmap *tunnel_map;
 
 static int tex_xsz, tex_ysz;
 static unsigned int *tex_pixels;
 static int tex_xshift, tex_yshift;
 static unsigned int tex_xmask, tex_ymask;
 
+#ifndef NO_THREADS
 static struct thread_pool *tpool;
+#endif
+
+static long trans_start, trans_dur;
+static int trans_dir;
 
 
-int init_tunnel(int x, int y, int bpp)
+struct screen *tunnel_screen(void)
+{
+	return &scr;
+}
+
+
+static int init(void)
 {
 	int i, j, n;
-	unsigned int *tmap;
-	unsigned char *fog;
-	float aspect = (float)x / (float)y;
+	struct tunmap *tmap;
+	float aspect = (float)fb_width / (float)fb_height;
 
-	switch(bpp) {
+	switch(fb_depth) {
 	case 16:
 		draw_tunnel_range = draw_tunnel_range16;
 		break;
@@ -48,26 +88,24 @@ int init_tunnel(int x, int y, int bpp)
 		draw_tunnel_range = draw_tunnel_range32;
 		break;
 	default:
-		fprintf(stderr, "unsupported color depth: %d\n", bpp);
+		fprintf(stderr, "unsupported color depth: %d\n", fb_depth);
 		return -1;
 	}
 
-	xsz = x;
-	ysz = y;
-	vxsz = xsz / USCALE;
-	vysz = ysz / VSCALE;
+	xsz = fb_width / 2;
+	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;
@@ -77,13 +115,12 @@ int init_tunnel(int x, int y, int bpp)
 			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 fog = (int)(d * 128.0f);
 
-			int f = (int)(d * 95.0);
-
-			*tmap++ = (tx << 16) | ty;
-			*fog++ = f > 255 ? 255 : f;
+			tmap->u = (int)(tu * 65535.0 * TEX_USCALE) & 0xffff;
+			tmap->v = (int)(tv * 65535.0 * TEX_VSCALE) & 0xffff;
+			tmap->fog = fog > 255 ? 255 : fog;
+			tmap++;
 		}
 	}
 
@@ -108,53 +145,102 @@ int init_tunnel(int x, int y, int bpp)
 	}
 	tex_yshift = n;
 
+#ifndef NO_THREADS
 	if(!(tpool = tpool_create(0))) {
 		fprintf(stderr, "failed to create thread pool\n");
 		return -1;
 	}
+#endif
+
+	/* initialize the constant part of all work items */
+	for(i=0; i<NUM_WORK_ITEMS; i++) {
+		int num_lines = ysz / NUM_WORK_ITEMS;
+		work[i].pixels = fb_pixels;
+		work[i].starty = i * num_lines;
+	}
 
 	return 0;
 }
 
-void destroy_tunnel(void)
+static void destroy(void)
 {
+#ifndef NO_THREADS
 	tpool_destroy(tpool);
+#endif
 	free(tunnel_map);
-	free(tunnel_fog);
 }
 
-#define NUM_WORK_ITEMS	32
+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;
+	}
+}
 
-static struct work {
-	void *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);
+	draw_tunnel_range(w->pixels, w->xoffs, w->yoffs, w->starty, w->num_lines, w->tm);
 }
 
-void draw_tunnel(void *pixels)
+static void draw(void)
 {
-	int i, num_lines = vysz / NUM_WORK_ITEMS;
+	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++) {
-		work[i].pixels = pixels;
-		work[i].starty = i * num_lines;
-		work[i].num_lines = num_lines;
+		work[i].num_lines = draw_lines;
+		work[i].tm = time_msec;
+		work[i].xoffs = xoffs;
+		work[i].yoffs = yoffs;
 
+#ifdef NO_THREADS
+		work_func(work + i);
+	}
+#else
 		tpool_enqueue(tpool, work + i, work_func, 0);
 	}
 	tpool_wait(tpool);
+#endif
 }
 
-static void tunnel_color(int *rp, int *gp, int *bp, long toffs, unsigned int tpacked, int fog)
+static void tunnel_color(int *rp, int *gp, int *bp, long toffs, struct tunmap *tmap)
 {
 	int r, g, b;
 	unsigned int col;
-	unsigned int tx = (((tpacked >> 16) & 0xffff) << tex_xshift) >> 16;
-	unsigned int ty = ((tpacked & 0xffff) << tex_yshift) >> 16;
+	unsigned int tx = (tmap->u << tex_xshift) >> 16;
+	unsigned int ty = (tmap->v << tex_yshift) >> 16;
 	tx += toffs;
 	ty += toffs << 1;
 
@@ -166,80 +252,57 @@ static void tunnel_color(int *rp, int *gp, int *bp, long toffs, unsigned int tpa
 	g = (col >> 8) & 0xff;
 	b = (col >> 16) & 0xff;
 
-	*rp = (r * fog) >> 8;
-	*gp = (g * fog) >> 8;
-	*bp = (b * fog) >> 8;
+	*rp = (r * tmap->fog) >> 8;
+	*gp = (g * tmap->fog) >> 8;
+	*bp = (b * tmap->fog) >> 8;
 }
 
 #define PACK_RGB16(r, g, b) \
-	(((((r) >> 3) & 0x1f) << 11) | ((((g) >> 2) & 0x3f) << 5) | ((b) & 0x1f))
+	(((((r) >> 3) & 0x1f) << 11) | ((((g) >> 2) & 0x3f) << 5) | (((b) >> 3) & 0x1f))
 #define PACK_RGB32(r, g, b) \
 	((((r) & 0xff) << 16) | (((g) & 0xff) << 8) | ((b) & 0xff))
 
-#define PUTPIXEL(pixtype, col) \
-	do { \
-		int k; \
-		pixtype *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; \
-		} \
-	} while(0)
-
-static void draw_tunnel_range16(void *pix, int starty, int num_lines)
+static void draw_tunnel_range16(void *pix, int xoffs, int yoffs, int starty, int num_lines, long tm)
 {
 	int i, j;
-	unsigned int *tmap = tunnel_map + starty * vxsz;
-	unsigned char *fog = tunnel_fog + starty * vxsz;
+	struct tunmap *tmap = tunnel_map + (starty + yoffs) * vxsz + xoffs;
 
-	long toffs = time_msec / 4;
-	unsigned short *pixels = (unsigned short*)pix + starty * xsz * VSCALE;
+	long toffs = tm / 4;
+	unsigned int *pixels = (unsigned int*)pix + starty * (fb_width >> 1);
 
 	for(i=0; i<num_lines; i++) {
-		for(j=0; j<vxsz; j++) {
+		for(j=0; j<xsz; j++) {
 			unsigned int col;
 			int r, g, b;
 
-			tunnel_color(&r, &g, &b, toffs, *tmap++, *fog++);
+			tunnel_color(&r, &g, &b, toffs, tmap + j);
 			col = PACK_RGB16(r, g, b);
-
-			PUTPIXEL(unsigned short, col);
-			pixels += USCALE;
+			*pixels++ = (col << 16) | col;
 		}
-		pixels += xsz * (VSCALE - 1);
+		tmap += vxsz;
 	}
 }
 
-static void draw_tunnel_range32(void *pix, int starty, int num_lines)
+static void draw_tunnel_range32(void *pix, int xoffs, int yoffs, int starty, int num_lines, long tm)
 {
 	int i, j;
-	unsigned int *tmap = tunnel_map + starty * vxsz;
-	unsigned char *fog = tunnel_fog + starty * vxsz;
+	struct tunmap *tmap = tunnel_map + (starty + yoffs) * vxsz + xoffs;
 
-	long toffs = time_msec / 4;
-	unsigned int *pixels = (unsigned int*)pix + starty * xsz * VSCALE;
+	long toffs = tm / 4;
+	unsigned int *pixels = (unsigned int*)pix + starty * fb_width;
 
 	for(i=0; i<num_lines; i++) {
-		for(j=0; j<vxsz; j++) {
+		for(j=0; j<xsz; j++) {
 			unsigned int col;
 			int r, g, b;
 
-			tunnel_color(&r, &g, &b, toffs, *tmap++, *fog++);
+			tunnel_color(&r, &g, &b, toffs, tmap + j);
 			col = PACK_RGB32(r, g, b);
 
-			PUTPIXEL(unsigned int, col);
-			pixels += USCALE;
+			*pixels++ = col;
+			*pixels++ = col;
 		}
-		pixels += xsz * (VSCALE - 1);
+		tmap += vxsz;
 	}
 }