Add getInverseProj() for camera

Add BeforeTonemappingFX step

h3d/Camera.hx

@@ -44,7 +44,8 @@ class Camera {
 	public var frustum(default, null) : h3d.col.Frustum;
 
 	var minv : Matrix;
-	var miview : Matrix;
+	var mcamInv : Matrix;
+	var mprojInv : Matrix;
 	var needInv : Bool;
 
 	public function new( fovY = 25., zoom = 1., screenRatio = 1.333333, zNear = 0.02, zFar = 4000., rightHanded = false ) {
@@ -103,17 +104,30 @@ class Camera {
 		return minv;
 	}
 
+	/**
+		Returns the inverse of the camera matrix projection. Cache the result until the next update().
+	**/
+	public function getInverseProj() {
+		if( mprojInv == null ) {
+			mprojInv = new h3d.Matrix();
+			mprojInv._44 = 0;
+		}
+		if( mprojInv._44 == 0 )
+			mprojInv.initInverse(mproj);
+		return mprojInv;
+	}
+
 	/**
 		Returns the inverse of the camera matrix view only. Cache the result until the next update().
 	**/
 	public function getInverseView() {
-		if( miview == null ) {
-			miview = new h3d.Matrix();
-			miview._44 = 0;
+		if( mcamInv == null ) {
+			mcamInv = new h3d.Matrix();
+			mcamInv._44 = 0;
 		}
-		if( miview._44 == 0 )
-			miview.initInverse(mcam);
-		return miview;
+		if( mcamInv._44 == 0 )
+			mcamInv.initInverse(mcam);
+		return mcamInv;
 	}
 
 	/**
@@ -181,7 +195,8 @@ class Camera {
 		m.multiply(mcam, mproj);
 
 		needInv = true;
-		if( miview != null ) miview._44 = 0;
+		if( mcamInv != null ) mcamInv._44 = 0;
+		if( mprojInv != null ) mprojInv._44 = 0;
 
 		frustum.loadMatrix(m);
 	}

h3d/impl/RendererFX.hx

@@ -2,6 +2,7 @@ package h3d.impl;
 
 enum Step {
 	BeforeLighting;
+	BeforeTonemappingFX;
 	BeforeTonemapping;
 	AfterTonemapping;
 	AfterUI;

h3d/scene/pbr/Renderer.hx

@@ -425,6 +425,7 @@ class Renderer extends h3d.scene.Renderer {
 
 		lighting();
 
+		apply(BeforeTonemappingFX);
 		drawBeforeTonemapping();
 		apply(BeforeTonemapping);