From 1326ae9a5d9c33757acdb95de0fc5cc3ff989ddc Mon Sep 17 00:00:00 2001
From: Alex Szpakowski <slime73@gmail.com>
Date: Fri, 27 Feb 2015 03:58:40 -0400
Subject: [PATCH] Added love.graphics.clearStencil, which only clears the
 stencil buffer.

--HG--
branch : minor
---
 src/modules/graphics/opengl/Graphics.cpp      | 5 +++++
 src/modules/graphics/opengl/Graphics.h        | 5 +++++
 src/modules/graphics/opengl/wrap_Graphics.cpp | 7 +++++++
 src/modules/graphics/opengl/wrap_Graphics.h   | 1 +
 4 files changed, 18 insertions(+)

diff --git a/src/modules/graphics/opengl/Graphics.cpp b/src/modules/graphics/opengl/Graphics.cpp
index 64288e11c..a03ac5005 100644
--- a/src/modules/graphics/opengl/Graphics.cpp
+++ b/src/modules/graphics/opengl/Graphics.cpp
@@ -575,6 +575,11 @@ void Graphics::getStencilTest(bool &enable, bool &invert)
 	invert = state.stencilInvert;
 }
 
+void Graphics::clearStencil()
+{
+	glClear(GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+}
+
 Image *Graphics::newImage(love::image::ImageData *data, const Image::Flags &flags)
 {
 	// Create the image.
diff --git a/src/modules/graphics/opengl/Graphics.h b/src/modules/graphics/opengl/Graphics.h
index cd2b45abe..e93e2b159 100644
--- a/src/modules/graphics/opengl/Graphics.h
+++ b/src/modules/graphics/opengl/Graphics.h
@@ -138,6 +138,11 @@ public:
 	void setStencilTest(bool enable, bool invert);
 	void getStencilTest(bool &enable, bool &invert);
 
+	/**
+	 * Clear the stencil buffer in the active Canvas(es.)
+	 **/
+	void clearStencil();
+
 	/**
 	 * Creates an Image object with padding and/or optimization.
 	 **/
diff --git a/src/modules/graphics/opengl/wrap_Graphics.cpp b/src/modules/graphics/opengl/wrap_Graphics.cpp
index b4644cd5a..eb0f341e7 100644
--- a/src/modules/graphics/opengl/wrap_Graphics.cpp
+++ b/src/modules/graphics/opengl/wrap_Graphics.cpp
@@ -166,6 +166,12 @@ int w_getStencilTest(lua_State *L)
 	return 2;
 }
 
+int w_clearStencil(lua_State* /*L*/)
+{
+	instance()->clearStencil();
+	return 0;
+}
+
 static const char *imageFlagName(Image::FlagType flagtype)
 {
 	const char *name = nullptr;
@@ -1531,6 +1537,7 @@ static const luaL_Reg functions[] =
 	{ "stencil", w_stencil },
 	{ "setStencilTest", w_setStencilTest },
 	{ "getStencilTest", w_getStencilTest },
+	{ "clearStencil", w_clearStencil },
 
 	{ "point", w_point },
 	{ "line", w_line },
diff --git a/src/modules/graphics/opengl/wrap_Graphics.h b/src/modules/graphics/opengl/wrap_Graphics.h
index 5270cdb89..6e5bf434f 100644
--- a/src/modules/graphics/opengl/wrap_Graphics.h
+++ b/src/modules/graphics/opengl/wrap_Graphics.h
@@ -53,6 +53,7 @@ int w_getScissor(lua_State *L);
 int w_stencil(lua_State *L);
 int w_setStencilTest(lua_State *L);
 int w_getStencilTest(lua_State *L);
+int w_clearStencil(lua_State *L);
 int w_newImage(lua_State *L);
 int w_newQuad(lua_State *L);
 int w_newFont(lua_State *L);