From c06379ee3aa51d3adf456c8d126feebd1da9de70 Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Sun, 4 Aug 2024 12:43:55 +0000
Subject: make the depth buffer 32-bit.

---
 clip.c     | 2 +-
 fb.c       | 4 ++--
 graphics.h | 2 +-
 internal.h | 2 +-
 render.c   | 3 ++-
 util.c     | 4 ++--
 6 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/clip.c b/clip.c
index 9988ce1..94f84a6 100644
--- a/clip.c
+++ b/clip.c
@@ -194,7 +194,7 @@ outcode(Point p, Rectangle r)
 }
 
 /* lerp vertex attributes to match the new positions */
-void
+static void
 adjustverts(Point *p0, Point *p1, Vertex *v0, Vertex *v1)
 {
 	Vertex v[2];
diff --git a/fb.c b/fb.c
index 4806604..6193a3c 100644
--- a/fb.c
+++ b/fb.c
@@ -219,7 +219,7 @@ framebufctl_reset(Framebufctl *ctl)
 	/* address the back buffer—resetting the front buffer is VERBOTEN */
 	fb = ctl->getbb(ctl);
 	memset(fb->nb, 0, Dx(fb->r)*Dy(fb->r)*4);
-	memsetd(fb->zb, Inf(-1), Dx(fb->r)*Dy(fb->r));
+	memsetf(fb->zb, Inf(-1), Dx(fb->r)*Dy(fb->r));
 	memset(fb->cb, 0, Dx(fb->r)*Dy(fb->r)*4);
 }
 
@@ -244,7 +244,7 @@ mkfb(Rectangle r)
 	memset(fb, 0, sizeof *fb);
 	fb->cb = emalloc(Dx(r)*Dy(r)*4);
 	fb->zb = emalloc(Dx(r)*Dy(r)*sizeof(*fb->zb));
-	memsetd(fb->zb, Inf(-1), Dx(r)*Dy(r));
+	memsetf(fb->zb, Inf(-1), Dx(r)*Dy(r));
 	fb->nb = emalloc(Dx(r)*Dy(r)*4);
 	fb->r = r;
 	return fb;
diff --git a/graphics.h b/graphics.h
index 52becf3..dfc9f39 100644
--- a/graphics.h
+++ b/graphics.h
@@ -249,7 +249,7 @@ struct Renderjob
 struct Framebuf
 {
 	ulong *cb;	/* color buffer */
-	double *zb;	/* z/depth buffer */
+	float *zb;	/* z/depth buffer */
 	ulong *nb;	/* normals buffer (DBG only) */
 	Rectangle r;
 };
diff --git a/internal.h b/internal.h
index 777ace8..6cd512c 100644
--- a/internal.h
+++ b/internal.h
@@ -60,7 +60,7 @@ int min(int, int);
 int max(int, int);
 void swapi(int*, int*);
 void swappt(Point*, Point*);
-void memsetd(void*, double, usize);
+void memsetf(void*, float, usize);
 void memsetl(void*, ulong, usize);
 
 /* nanosec */
diff --git a/render.c b/render.c
index 549ee1a..a28ed1b 100644
--- a/render.c
+++ b/render.c
@@ -101,7 +101,8 @@ rasterize(Rastertask *task)
 	Point p, dp, Δp, p0, p1;
 	Point3 bc;
 	Color c;
-	double z, dplen, perc;
+	double dplen, perc;
+	float z;
 	int steep = 0, Δe, e, Δy;
 
 	params = task->params;
diff --git a/util.c b/util.c
index 2bf77c2..2ddf21c 100644
--- a/util.c
+++ b/util.c
@@ -65,9 +65,9 @@ modulapt3(Point3 a, Point3 b)
 }
 
 void
-memsetd(void *dp, double v, usize len)
+memsetf(void *dp, float v, usize len)
 {
-	double *p, *ep;
+	float *p, *ep;
 
 	for(p = dp, ep = p+len; p < ep; p++)
 		*p = v;
-- 
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