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, 81 insertions, 0 deletions

diff --git a/fb.c b/fb.c
new file mode 100644
index 0000000..a7a5122
--- /dev/null
+++ b/fb.c
@@ -0,0 +1,81 @@
+#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"
+
+static void
+framebufctl_draw(Framebufctl *ctl, Memimage *dst)
+{
+	lock(&ctl->swplk);
+	memimagedraw(dst, dst->r, ctl->fb[ctl->idx]->cb, ZP, nil, ZP, SoverD);
+	unlock(&ctl->swplk);
+}
+
+static void
+framebufctl_swap(Framebufctl *ctl)
+{
+	lock(&ctl->swplk);
+	ctl->idx ^= 1;
+	unlock(&ctl->swplk);
+}
+
+static void
+framebufctl_reset(Framebufctl *ctl)
+{
+	Framebuf *fb;
+
+	/* address the back buffer—resetting the front buffer is VERBOTEN */
+	fb = ctl->fb[ctl->idx^1];
+	memsetd(fb->zbuf, Inf(-1), Dx(fb->r)*Dy(fb->r));
+	memfillcolor(fb->cb, DTransparent);
+}
+
+Framebuf *
+mkfb(Rectangle r)
+{
+	Framebuf *fb;
+
+	fb = emalloc(sizeof *fb);
+	memset(fb, 0, sizeof *fb);
+	fb->cb = eallocmemimage(r, RGBA32);
+	fb->zbuf = emalloc(Dx(r)*Dy(r)*sizeof(*fb->zbuf));
+	memsetd(fb->zbuf, Inf(-1), Dx(r)*Dy(r));
+	fb->r = r;
+	return fb;
+}
+
+void
+rmfb(Framebuf *fb)
+{
+	free(fb->zbuf);
+	freememimage(fb->cb);
+	free(fb);
+}
+
+Framebufctl *
+mkfbctl(Rectangle r)
+{
+	Framebufctl *fc;
+
+	fc = emalloc(sizeof *fc);
+	memset(fc, 0, sizeof *fc);
+	fc->fb[0] = mkfb(r);
+	fc->fb[1] = mkfb(r);
+	fc->draw = framebufctl_draw;
+	fc->swap = framebufctl_swap;
+	fc->reset = framebufctl_reset;
+	return fc;
+}
+
+void
+rmfbctl(Framebufctl *fc)
+{
+	rmfb(fc->fb[1]);
+	rmfb(fc->fb[0]);
+	free(fc);
+}