import the new renderer and clean things up.

i integrated the renderer i've been developing
on the tinyrend repo and got rid of a bunch of
stuff that's no longer necessary. also began
structuring things to fit the new interface i
have in mind.

there are still some artifacts with the
projection xforms that cause issues with
clipping and division by zero.

1 files changed, 108 insertions, 0 deletions

diff --git a/util.c b/util.c
new file mode 100644
index 0000000..1ff251f
--- /dev/null
+++ b/util.c
@@ -0,0 +1,108 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <memdraw.h>
+#include <geometry.h>
+#include "libobj/obj.h"
+#include "graphics.h"
+#include "internal.h"
+
+int
+min(int a, int b)
+{
+	return a < b? a: b;
+}
+
+int
+max(int a, int b)
+{
+	return a > b? a: b;
+}
+
+double
+fmin(double a, double b)
+{
+	return a < b? a: b;
+}
+
+double
+fmax(double a, double b)
+{
+	return a > b? a: b;
+}
+
+void
+memsetd(double *p, double v, usize len)
+{
+	double *dp;
+
+	for(dp = p; dp < p+len; dp++)
+		*dp = v;
+}
+
+Memimage *
+rgb(ulong c)
+{
+	Memimage *i;
+
+	i = eallocmemimage(UR, screen->chan);
+	i->flags |= Frepl;
+	i->clipr = Rect(-1e6, -1e6, 1e6, 1e6);
+	memfillcolor(i, c);
+	return i;
+}
+
+static void
+decproc(void *arg)
+{
+	char buf[32];
+	Deco *d;
+
+	d = arg;
+
+	close(d->pfd[0]);
+	dup(d->infd, 0);
+	close(d->infd);
+	dup(d->pfd[1], 1);
+	close(d->pfd[1]);
+
+	snprint(buf, sizeof buf, "/bin/%s", d->prog);
+
+	execl(buf, d->prog, "-9t", nil);
+	threadexitsall("execl: %r");
+}
+
+static Memimage *
+genreadimage(char *prog, char *path)
+{
+	Memimage *i;
+	Deco d;
+
+	d.prog = prog;
+
+	if(pipe(d.pfd) < 0)
+		sysfatal("pipe: %r");
+	d.infd = open(path, OREAD);
+	if(d.infd < 0)
+		sysfatal("open: %r");
+	procrfork(decproc, &d, mainstacksize, RFFDG|RFNAMEG|RFNOTEG);
+	close(d.pfd[1]);
+	i = readmemimage(d.pfd[0]);
+	close(d.pfd[0]);
+	close(d.infd);
+
+	return i;
+}
+
+Memimage *
+readtga(char *path)
+{
+	return genreadimage("tga", path);
+}
+
+Memimage *
+readpng(char *path)
+{
+	return genreadimage("png", path);
+}