diff --git a/sysdata/libraries/render/src/lib.hb b/sysdata/libraries/render/src/lib.hb
index 492f89f..66a68ee 100644
--- a/sysdata/libraries/render/src/lib.hb
+++ b/sysdata/libraries/render/src/lib.hb
@@ -42,6 +42,7 @@ clear := mode.clear
 put_surface := mode.put_surface
 put_scaled := mode.put_scaled
 put_tri_wireframe := mode.put_tri_wireframe
+put_tri_filled := mode.put_tri_filled
 // thanks peony for these three!
 put_trirect := mode.put_trirect
 put_vline := mode.put_vline
diff --git a/sysdata/libraries/render/src/software.hb b/sysdata/libraries/render/src/software.hb
index fd50087..2b302f9 100644
--- a/sysdata/libraries/render/src/software.hb
+++ b/sysdata/libraries/render/src/software.hb
@@ -1,4 +1,4 @@
-.{math, memory, dt} := @use("../../stn/src/lib.hb");
+.{math, memory, dt, log} := @use("../../stn/src/lib.hb");
 .{Color} := @use("lib.hb");
 .{Vec2} := math
 
@@ -68,8 +68,8 @@ indexptr := fn(surface: Surface, x: int, y: int): ^Color {
 	return surface.buf + @inline(index, surface, x, y)
 }
 
-put_pixel := fn(surface: Surface, pos: Vec2(int), color: Color): void {
-	*@inline(indexptr, surface, pos.x, pos.y) = color
+put_pixel := fn(surface: Surface, pos: Vec2(uint), color: Color): void {
+	*@inline(indexptr, surface, @intcast(pos.x), @intcast(pos.y)) = color
 	return
 }
 
@@ -329,9 +329,36 @@ put_hline := fn(surface: Surface, y: int, x0: int, x1: int, color: Color): void
 	return
 }
 
-put_tri_wireframe := fn(surface: Surface, p0: Vec2(uint), p1: Vec2(uint), p2: Vec2(uint), color: Color): void {
+put_tri_wireframe := fn(surface: Surface, p0: Vec2(int), p1: Vec2(int), p2: Vec2(int), color: Color): void {
 	put_line(surface, p0, p1, color)
 	put_line(surface, p1, p2, color)
 	put_line(surface, p2, p0, color)
+	return
+}
+
+put_tri_filled := fn(surface: Surface, p0: Vec2(uint), p1: Vec2(uint), p2: Vec2(uint), color: Color): void {
+	if p2.y < p0.y {
+		tmp := p0
+		p0 = p2
+		p2 = tmp
+	}
+
+	if p1.y < p0.y {
+		tmp := p0
+		p0 = p1
+		p1 = tmp
+	}
+
+	if p2.y < p1.y {
+		tmp := p1
+		p1 = p2
+		p2 = tmp
+	}
+
+	y := p0.y
+	loop if y > p2.y break else {
+		y += 1
+	}
+
 	return
 }
\ No newline at end of file
diff --git a/sysdata/programs/render_example/src/examples/cube.hb b/sysdata/programs/render_example/src/examples/cube.hb
index 042e4da..0318b98 100644
--- a/sysdata/programs/render_example/src/examples/cube.hb
+++ b/sysdata/programs/render_example/src/examples/cube.hb
@@ -4,7 +4,8 @@ render := @use("../../../../libraries/render/src/lib.hb")
 example := fn(): void {
 	screen := render.init(true)
 	loop {
-		render.put_tri_wireframe(screen, .(10, 10), .(128, 256), .(512, 512), .(255, 255, 255, 255))
+		render.clear(screen, render.black)
+		render.put_tri_filled(screen, .(128, 256), .(512, 512), .(10, 10), .(255, 255, 255, 255))
 		render.sync(screen)
 	}
 	return