Fix some tests and do some cleanup.

test/constant_buffer.inx

@@ -0,0 +1,14 @@
+camera :: constant_buffer {
+	projection : float4x4;
+	view       : float4x4;
+}
+
+vertex main :: (pos : float4 @position) -> float4 @position {
+	mv : float4 = mul(camera.view, pos);
+	mvp : float4 = mul(camera.projection, mv);
+	return mvp;
+}
+
+pixel main :: () -> float4 @target {
+	return float4(0.5, 0.5, 0.5, 1.0);
+}