support for light and normal mapping in 2D

1 files changed, 160 insertions, 2 deletions

diff --git a/core/math/math_2d.h b/core/math/math_2d.h
index fa40d305f5..5bc1b5f0be 100644
--- a/core/math/math_2d.h
+++ b/core/math/math_2d.h
@@ -159,8 +159,8 @@ struct Vector2 {
 	
 	operator String() const { return String::num(x)+","+String::num(y); }
 	
-	inline Vector2(float p_x,float p_y) { x=p_x; y=p_y; }
-	inline Vector2() { x=0; y=0; }
+	_FORCE_INLINE_ Vector2(float p_x,float p_y) { x=p_x; y=p_y; }
+	_FORCE_INLINE_ Vector2() { x=0; y=0; }
 };
 
 _FORCE_INLINE_ Vector2 Vector2::plane_project(real_t p_d, const Vector2& p_vec) const {
@@ -198,6 +198,8 @@ Vector2 Vector2::linear_interpolate(const Vector2& p_a, const Vector2& p_b,float
 typedef Vector2 Size2;
 typedef Vector2 Point2;
 
+struct Matrix32;
+
 
 struct Rect2 {
 	
@@ -224,6 +226,8 @@ struct Rect2 {
 		return true;
 	}
 
+	_FORCE_INLINE_ bool intersects_transformed(const Matrix32& p_xform, const Rect2& p_rect) const;
+
 	bool intersects_segment(const Point2& p_from, const Point2& p_to, Point2* r_pos=NULL, Point2* r_normal=NULL) const;
 
 	inline bool encloses(const Rect2& p_rect) const {
@@ -597,6 +601,160 @@ struct Matrix32 {
 
 };
 
+bool Rect2::intersects_transformed(const Matrix32& p_xform, const Rect2& p_rect) const {
+
+	//SAT intersection between local and transformed rect2
+
+	Vector2 xf_points[4]={
+		p_xform.xform(p_rect.pos),
+		p_xform.xform(Vector2(p_rect.pos.x+p_rect.size.x,p_rect.pos.y)),
+		p_xform.xform(Vector2(p_rect.pos.x,p_rect.pos.y+p_rect.size.y)),
+		p_xform.xform(Vector2(p_rect.pos.x+p_rect.size.x,p_rect.pos.y+p_rect.size.y)),
+	};
+
+	real_t low_limit;
+
+	//base rect2 first (faster)
+
+	if (xf_points[0].y>pos.y)
+		goto next1;
+	if (xf_points[1].y>pos.y)
+		goto next1;
+	if (xf_points[2].y>pos.y)
+		goto next1;
+	if (xf_points[3].y>pos.y)
+		goto next1;
+
+	return false;
+
+	next1:
+
+	low_limit=pos.y+size.y;
+
+	if (xf_points[0].y<low_limit)
+		goto next2;
+	if (xf_points[1].y<low_limit)
+		goto next2;
+	if (xf_points[2].y<low_limit)
+		goto next2;
+	if (xf_points[3].y<low_limit)
+		goto next2;
+
+	return false;
+
+	next2:
+
+	if (xf_points[0].x>pos.x)
+		goto next3;
+	if (xf_points[1].x>pos.x)
+		goto next3;
+	if (xf_points[2].x>pos.x)
+		goto next3;
+	if (xf_points[3].x>pos.x)
+		goto next3;
+
+	return false;
+
+	next3:
+
+	low_limit=pos.x+size.x;
+
+	if (xf_points[0].x<low_limit)
+		goto next4;
+	if (xf_points[1].x<low_limit)
+		goto next4;
+	if (xf_points[2].x<low_limit)
+		goto next4;
+	if (xf_points[3].x<low_limit)
+		goto next4;
+
+	return false;
+
+	next4:
+
+	Vector2 xf_points2[4]={
+		pos,
+		Vector2(pos.x+size.x,pos.y),
+		Vector2(pos.x,pos.y+size.y),
+		Vector2(pos.x+size.x,pos.y+size.y),
+	};
+
+	real_t maxa=p_xform.elements[0].dot(xf_points2[0]);
+	real_t mina=maxa;
+
+	real_t dp = p_xform.elements[0].dot(xf_points2[1]);
+	maxa=MAX(dp,maxa);
+	mina=MIN(dp,mina);
+
+	dp = p_xform.elements[0].dot(xf_points2[2]);
+	maxa=MAX(dp,maxa);
+	mina=MIN(dp,mina);
+
+	dp = p_xform.elements[0].dot(xf_points2[3]);
+	maxa=MAX(dp,maxa);
+	mina=MIN(dp,mina);
+
+	real_t maxb=p_xform.elements[0].dot(xf_points[0]);
+	real_t minb=maxb;
+
+	dp = p_xform.elements[0].dot(xf_points[1]);
+	maxb=MAX(dp,maxb);
+	minb=MIN(dp,minb);
+
+	dp = p_xform.elements[0].dot(xf_points[2]);
+	maxb=MAX(dp,maxb);
+	minb=MIN(dp,minb);
+
+	dp = p_xform.elements[0].dot(xf_points[3]);
+	maxb=MAX(dp,maxb);
+	minb=MIN(dp,minb);
+
+
+	if ( mina > maxb )
+		return false;
+	if ( minb > maxa  )
+		return false;
+
+	maxa=p_xform.elements[1].dot(xf_points2[0]);
+	mina=maxa;
+
+	dp = p_xform.elements[1].dot(xf_points2[1]);
+	maxa=MAX(dp,maxa);
+	mina=MIN(dp,mina);
+
+	dp = p_xform.elements[1].dot(xf_points2[2]);
+	maxa=MAX(dp,maxa);
+	mina=MIN(dp,mina);
+
+	dp = p_xform.elements[1].dot(xf_points2[3]);
+	maxa=MAX(dp,maxa);
+	mina=MIN(dp,mina);
+
+	maxb=p_xform.elements[1].dot(xf_points[0]);
+	minb=maxb;
+
+	dp = p_xform.elements[1].dot(xf_points[1]);
+	maxb=MAX(dp,maxb);
+	minb=MIN(dp,minb);
+
+	dp = p_xform.elements[1].dot(xf_points[2]);
+	maxb=MAX(dp,maxb);
+	minb=MIN(dp,minb);
+
+	dp = p_xform.elements[1].dot(xf_points[3]);
+	maxb=MAX(dp,maxb);
+	minb=MIN(dp,minb);
+
+
+	if ( mina > maxb )
+		return false;
+	if ( minb > maxa  )
+		return false;
+
+
+	return true;
+
+}
 
 Vector2 Matrix32::basis_xform(const Vector2& v) const {