shithub: libgraphics

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make the depth buffer 32-bit.

--- a/clip.c

+++ b/clip.c

@@ -194,7 +194,7 @@

 }

 /* lerp vertex attributes to match the new positions */

-void

+static void

 adjustverts(Point *p0, Point *p1, Vertex *v0, Vertex *v1)

 {

 	Vertex v[2];

--- a/fb.c

+++ b/fb.c

@@ -219,7 +219,7 @@

 	/* 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 @@

 	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;

--- a/graphics.h

+++ b/graphics.h

@@ -249,7 +249,7 @@

 struct Framebuf

 {

 	ulong *cb;	/* color buffer */

-	double *zb;	/* z/depth buffer */

+	float *zb;	/* z/depth buffer */

 	ulong *nb;	/* normals buffer (DBG only) */

 	Rectangle r;

 };

--- a/internal.h

+++ b/internal.h

@@ -60,7 +60,7 @@

 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 */

--- a/render.c

+++ b/render.c

@@ -101,7 +101,8 @@

 	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;

--- a/util.c

+++ b/util.c

@@ -65,9 +65,9 @@

 }

 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;