From d3b48593b0fee862ea60687336031fd9374ab667 Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Sat, 10 Aug 2024 17:57:02 +0000
Subject: experimental A-buffer implementation.

very simple, without anti-aliasing, made for getting
OIT (order independent transparency) rendering of
arbitrary objects.

also added switches for blending, depth testing and the
A-buffer to the camera.
---
 fb.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'fb.c')

diff --git a/fb.c b/fb.c
index 88883fd..6bd22e9 100644
--- a/fb.c
+++ b/fb.c
@@ -211,6 +211,16 @@ framebufctl_swap(Framebufctl *ctl)
 	qunlock(ctl);
 }
 
+static void
+resetAbuf(Abuf *buf)
+{
+	while(buf->nact--)
+		free(buf->act[buf->nact]->items);
+	free(buf->act);
+	free(buf->stk);
+	memset(buf, 0, sizeof *buf);
+}
+
 static void
 framebufctl_reset(Framebufctl *ctl)
 {
@@ -218,6 +228,7 @@ framebufctl_reset(Framebufctl *ctl)
 
 	/* address the back buffer—resetting the front buffer is VERBOTEN */
 	fb = ctl->getbb(ctl);
+	resetAbuf(&fb->abuf);
 	memset(fb->nb, 0, Dx(fb->r)*Dy(fb->r)*4);
 	memsetf(fb->zb, Inf(-1), Dx(fb->r)*Dy(fb->r));
 	memset(fb->cb, 0, Dx(fb->r)*Dy(fb->r)*4);
-- 
cgit v1.2.3