From 671c2cac38ffada7f9185b87ec27b84566db8c2b Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Fri, 15 Nov 2024 16:41:59 +0000
Subject: =?UTF-8?q?forgot=20the=20vfx=20units=E2=80=A6?=
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---
 sprite.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 vfx.c    |  71 +++++++++++++++++++++++++++++++++++++
 2 files changed, 193 insertions(+)
 create mode 100644 sprite.c
 create mode 100644 vfx.c

diff --git a/sprite.c b/sprite.c
new file mode 100644
index 0000000..3766fe2
--- /dev/null
+++ b/sprite.c
@@ -0,0 +1,122 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <mouse.h>
+#include <keyboard.h>
+#include <geometry.h>
+#include "dat.h"
+#include "fns.h"
+
+static void
+sprite_step(Sprite *spr, ulong Δt)
+{
+	if(spr->nframes < 2)
+		return;
+
+	spr->elapsed += Δt;
+
+	if(spr->elapsed >= spr->period){
+		spr->elapsed -= spr->period;
+		spr->curframe = ++spr->curframe % spr->nframes;
+	}
+}
+
+static void
+sprite_draw(Sprite *spr, Image *dst, Point dp)
+{
+	Point sp = (Point){
+		spr->curframe * Dx(spr->r),
+		0
+	};
+	sp = addpt(spr->sp, sp);
+
+	draw(dst, rectaddpt(spr->r, dp), spr->sheet, nil, sp);
+}
+
+static Sprite *
+sprite_clone(Sprite *spr)
+{
+	return newsprite(spr->sheet, spr->sp, spr->r, spr->nframes, spr->period);
+}
+
+Sprite *
+newsprite(Image *sheet, Point sp, Rectangle r, int nframes, ulong period)
+{
+	Sprite *spr;
+
+	spr = emalloc(sizeof(Sprite));
+	spr->sheet = sheet;
+	spr->sp = sp;
+	spr->r = r;
+	spr->nframes = nframes;
+	spr->curframe = 0;
+	spr->period = period;
+	spr->elapsed = 0;
+	spr->step = sprite_step;
+	spr->draw = sprite_draw;
+	spr->clone = sprite_clone;
+
+	return spr;
+}
+
+Sprite *
+readsprite(char *sheetfile, Point sp, Rectangle r, int nframes, ulong period)
+{
+	Image *sheet;
+	int fd;
+
+	fd = open(sheetfile, OREAD);
+	if(fd < 0)
+		sysfatal("readsprite: %r");
+	sheet = readimage(display, fd, 1);
+	close(fd);
+
+	return newsprite(sheet, sp, r, nframes, period);
+}
+
+static void
+decproc(void *arg)
+{
+	int fd, *pfd;
+
+	pfd = arg;
+	fd = pfd[2];
+
+	close(pfd[0]);
+	dup(fd, 0);
+	close(fd);
+	dup(pfd[1], 1);
+	close(pfd[1]);
+
+	execl("/bin/png", "png", "-t9", nil);
+	threadexitsall("execl: %r");
+}
+
+Sprite *
+readpngsprite(char *sheetfile, Point sp, Rectangle r, int nframes, ulong period)
+{
+	Image *sheet;
+	int fd, pfd[3];
+
+	if(pipe(pfd) < 0)
+		sysfatal("pipe: %r");
+	fd = open(sheetfile, OREAD);
+	if(fd < 0)
+		sysfatal("readpngsprite: %r");
+	pfd[2] = fd;
+	procrfork(decproc, pfd, mainstacksize, RFFDG|RFNAMEG|RFNOTEG);
+	close(pfd[1]);
+	sheet = readimage(display, pfd[0], 1);
+	close(pfd[0]);
+	close(fd);
+
+	return newsprite(sheet, sp, r, nframes, period);
+}
+
+void
+delsprite(Sprite *spr)
+{
+	//freeimage(spr->sheet);
+	free(spr);
+}
diff --git a/vfx.c b/vfx.c
new file mode 100644
index 0000000..787a67d
--- /dev/null
+++ b/vfx.c
@@ -0,0 +1,71 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <mouse.h>
+#include <keyboard.h>
+#include <geometry.h>
+#include "dat.h"
+#include "fns.h"
+
+static void
+vfx_step(Vfx *v, ulong Δt)
+{
+	if(v->times == 0 && v->a->curframe == 0){
+		delvfx(v);
+		return;
+	}
+
+	v->a->step(v->a, Δt);
+
+	if(v->times > 0 && v->a->curframe == v->a->nframes-1)
+		v->times--;
+}
+
+static void
+vfx_draw(Vfx *v, Image *dst)
+{
+	if(v->times == 0 && v->a->curframe == 0)
+		return;
+
+	v->a->draw(v->a, dst, subpt(v->p, divpt(subpt(v->a->r.max, v->a->r.min), 2)));
+}
+
+Vfx *
+newvfx(Sprite *spr, Point dp, int repeat)
+{
+	Vfx *v;
+
+	v = emalloc(sizeof(Vfx));
+	v->a = spr;
+	v->p = dp;
+	v->times = repeat;
+	v->step = vfx_step;
+	v->draw = vfx_draw;
+
+	return v;
+}
+
+void
+delvfx(Vfx *v)
+{
+	v->next->prev = v->prev;
+	v->prev->next = v->next;
+	delsprite(v->a);
+	free(v);
+}
+
+void
+addvfx(Vfx *v, Vfx *nv)
+{
+	nv->prev = v->prev;
+	nv->next = v;
+	v->prev->next = nv;
+	v->prev = nv;
+}
+
+void
+initvfxq(Vfx *v)
+{
+	v->next = v->prev = v;
+}
-- 
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