1 files changed, 76 insertions, 0 deletions
diff --git a/fb.c b/fb.c
new file mode 100644
index 0000000..c03b36b
--- /dev/null
+++ b/fb.c
@@ -0,0 +1,76 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <memdraw.h>
+#include <mouse.h>
+#include <keyboard.h>
+#include <geometry.h>
+#include "libobj/obj.h"
+#include "dat.h"
+#include "fns.h"
+
+extern int shownormals;	/* XXX DBG */
+
+static void
+framebufctl_draw(Framebufctl *ctl, Memimage *dst, int showz)
+{
+	lock(&ctl->swplk);
+	memimagedraw(dst, dst->r, showz? ctl->fb[ctl->idx]->zb: ctl->fb[ctl->idx]->cb, ZP, nil, ZP, SoverD);
+	/* XXX DBG */
+	if(shownormals)
+		memimagedraw(dst, dst->r, ctl->fb[ctl->idx]->nb, 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);
+	memfillcolor(fb->zb, DTransparent);
+	memfillcolor(fb->nb, DTransparent);	/* XXX DBG */
+}
+
+Framebuf *
+mkfb(Rectangle r)
+{
+	Framebuf *fb;
+
+	fb = emalloc(sizeof *fb);
+	fb->cb = eallocmemimage(r, RGBA32);
+	fb->zb = eallocmemimage(r, RGBA32);
+	fb->zbuf = emalloc(Dx(r)*Dy(r)*sizeof(*fb->zbuf));
+	memsetd(fb->zbuf, Inf(-1), Dx(r)*Dy(r));
+	memset(&fb->zbuflk, 0, sizeof(fb->zbuflk));
+	fb->nb = eallocmemimage(r, RGBA32);	/* XXX DBG */
+	fb->r = r;
+	return fb;
+}
+
+Framebufctl *
+newfbctl(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;
+}