- Extended fake Shape2D.

src/v_draw.cpp

@@ -131,8 +131,51 @@ DEFINE_ACTION_FUNCTION(_Screen, PaletteColor)
 }
 
 // Dummy ZScript arbitrary textured shape drawing
+IMPLEMENT_CLASS(DShape2DTransform, false, false)
+
+DEFINE_ACTION_FUNCTION(DShape2DTransform, Clear)
+{
+	PARAM_SELF_PROLOGUE(DShape2DTransform);
+
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(DShape2DTransform, Rotate)
+{
+	PARAM_SELF_PROLOGUE(DShape2DTransform);
+	PARAM_FLOAT(angle);
+
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(DShape2DTransform, Scale)
+{
+	PARAM_SELF_PROLOGUE(DShape2DTransform);
+	PARAM_FLOAT(x);
+	PARAM_FLOAT(y);
+
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(DShape2DTransform, Translate)
+{
+	PARAM_SELF_PROLOGUE(DShape2DTransform);
+	PARAM_FLOAT(x);
+	PARAM_FLOAT(y);
+
+	return 0;
+}
+
 IMPLEMENT_CLASS(DShape2D, false, false)
 
+DEFINE_ACTION_FUNCTION(DShape2D, SetTransform)
+{
+	PARAM_SELF_PROLOGUE(DShape2D);
+	PARAM_OBJECT(transform, DShape2DTransform);
+
+	return 0;
+}
+
 DEFINE_ACTION_FUNCTION(DShape2D, Clear)
 {
 	PARAM_SELF_PROLOGUE(DShape2D);

src/v_video.h

@@ -209,6 +209,14 @@ struct VMVa_List
 	const uint8_t *reginfo;
 };
 
+class DShape2DTransform : public DObject
+{
+
+	DECLARE_CLASS(DShape2DTransform, DObject)
+public:
+	DMatrix3x3 transform;
+};
+
 // intermediate struct for fake shape drawing
 
 enum EClearWhich
@@ -226,6 +234,11 @@ public:
 	TArray<int> mIndices;
 	TArray<DVector2> mVertices;
 	TArray<DVector2> mCoords;
+
+	DMatrix3x3 transform;
+
+	bool dirty = true;
+	TArray<DVector2> mTransformedVertices;
 };
 
 //

src/vectors.h

@@ -979,6 +979,35 @@ Outside comments: A faster version with only 10 (not 24) multiplies.
 
 	TMatrix3x3(const Vector3 &axis, TAngle<vec_t> degrees);
 
+	static TMatrix3x3 Rotate2D(double radians)
+	{
+		double c = g_cos(radians);
+		double s = g_sin(radians);
+		TMatrix3x3 ret;
+		ret.Cells[0][0] = c; ret.Cells[0][1] = -s; ret.Cells[0][2] = 0;
+		ret.Cells[1][0] = s; ret.Cells[1][1] =  c; ret.Cells[1][2] = 0;
+		ret.Cells[2][0] = 0; ret.Cells[2][1] =  0; ret.Cells[2][2] = 1;
+		return ret;
+	}
+
+	static TMatrix3x3 Scale2D(TVector2<vec_t> scaleVec)
+	{
+		TMatrix3x3 ret;
+		ret.Cells[0][0] = scaleVec.X; ret.Cells[0][1] =          0; ret.Cells[0][2] = 0;
+		ret.Cells[1][0] =          0; ret.Cells[1][1] = scaleVec.Y; ret.Cells[1][2] = 0;
+		ret.Cells[2][0] =          0; ret.Cells[2][1] =          0; ret.Cells[2][2] = 1;
+		return ret;
+	}
+
+	static TMatrix3x3 Translate2D(TVector2<vec_t> translateVec)
+	{
+		TMatrix3x3 ret;
+		ret.Cells[0][0] = 1; ret.Cells[0][1] = 0; ret.Cells[0][2] = translateVec.X;
+		ret.Cells[1][0] = 0; ret.Cells[1][1] = 1; ret.Cells[1][2] = translateVec.Y;
+		ret.Cells[2][0] = 0; ret.Cells[2][1] = 0; ret.Cells[2][2] =              1;
+		return ret;
+	}
+
 	void Zero()
 	{
 		memset (this, 0, sizeof *this);

wadsrc/static/zscript/base.zs

@@ -172,6 +172,14 @@ enum DrawTextureTags
 	DTA_Monospace,			// Strings only: Use a fixed distance between characters.
 };
 
+class Shape2DTransform : Object native
+{
+	native void Clear();
+	native void Rotate(double angle);
+	native void Scale(Vector2 scaleVec);
+	native void Translate(Vector2 translateVec);
+}
+
 class Shape2D : Object native
 {
 	enum EClearWhich
@@ -181,6 +189,8 @@ class Shape2D : Object native
 		C_Indices = 4,
 	};
 
+	native void SetTransform(Shape2DTransform transform);
+
 	native void Clear( int which = C_Verts|C_Coords|C_Indices );
 	native void PushVertex( Vector2 v );
 	native void PushCoord( Vector2 c );