From 9e94f5a3759930e9219a96e22e7f6475cae53c35 Mon Sep 17 00:00:00 2001
From: Alex Szpakowski <slime73@gmail.com>
Date: Sun, 26 Feb 2017 17:15:26 -0400
Subject: [PATCH] =?UTF-8?q?love.graphics.drawLayer(canvas,=20=E2=80=A6)=20?=
 =?UTF-8?q?now=20errors=20if=20the=20Canvas=20is=20currently=20active=20as?=
 =?UTF-8?q?=20a=20render=20target=20(matches=20behaviour=20of=20love.graph?=
 =?UTF-8?q?ics.draw).?=
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--HG--
branch : minor
---
 src/modules/graphics/Canvas.cpp | 8 ++++++++
 src/modules/graphics/Canvas.h   | 1 +
 2 files changed, 9 insertions(+)

diff --git a/src/modules/graphics/Canvas.cpp b/src/modules/graphics/Canvas.cpp
index 711de0032..280936e2d 100644
--- a/src/modules/graphics/Canvas.cpp
+++ b/src/modules/graphics/Canvas.cpp
@@ -48,6 +48,14 @@ void Canvas::draw(Graphics *gfx, Quad *q, const Matrix4 &t)
 	Texture::draw(gfx, q, t);
 }
 
+void Canvas::drawLayer(Graphics *gfx, int layer, Quad *quad, const Matrix4 &m)
+{
+	if (gfx->isCanvasActive(this))
+		throw love::Exception("Cannot render a Canvas to itself!");
+
+	Texture::drawLayer(gfx, layer, quad, m);
+}
+
 } // graphics
 } // love
 
diff --git a/src/modules/graphics/Canvas.h b/src/modules/graphics/Canvas.h
index 49ac879d8..6686355b8 100644
--- a/src/modules/graphics/Canvas.h
+++ b/src/modules/graphics/Canvas.h
@@ -58,6 +58,7 @@ public:
 	virtual ptrdiff_t getMSAAHandle() const = 0;
 
 	void draw(Graphics *gfx, Quad *q, const Matrix4 &t) override;
+	void drawLayer(Graphics *gfx, int layer, Quad *q, const Matrix4 &t) override;
 
 	static int canvasCount;