Added love.graphics.origin(): resets the coordinate system (replaces the current transformation matrix with the identity)

--HG--
branch : love.graphics.origin

src/modules/graphics/opengl/Graphics.cpp

@@ -207,7 +207,6 @@ void Graphics::reset()
 void Graphics::clear()
 {
 	glClear(GL_COLOR_BUFFER_BIT);
-	glLoadIdentity();
 }
 
 void Graphics::present()
@@ -1117,6 +1116,11 @@ void Graphics::shear(float kx, float ky)
 	glMultMatrixf((const GLfloat *)t.getElements());
 }
 
+void Graphics::origin()
+{
+	glLoadIdentity();
+}
+
 bool Graphics::hasFocus() const
 {
 	return currentWindow->hasFocus();

src/modules/graphics/opengl/Graphics.h

@@ -510,6 +510,7 @@ public:
 	void scale(float x, float y = 1.0f);
 	void translate(float x, float y);
 	void shear(float kx, float ky);
+	void origin();
 
 	bool hasFocus() const;
 private:

src/modules/graphics/opengl/wrap_Graphics.cpp

@@ -1250,6 +1250,12 @@ int w_shear(lua_State *L)
 	return 0;
 }
 
+int w_origin(lua_State *L)
+{
+	instance->origin();
+	return 0;
+}
+
 int w_hasFocus(lua_State *L)
 {
 	luax_pushboolean(L, instance->hasFocus());
@@ -1352,6 +1358,7 @@ static const luaL_Reg functions[] =
 	{ "scale", w_scale },
 	{ "translate", w_translate },
 	{ "shear", w_shear },
+	{ "origin", w_origin },
 
 	{ "hasFocus", w_hasFocus },
 

src/modules/graphics/opengl/wrap_Graphics.h

@@ -110,6 +110,7 @@ int w_rotate(lua_State *L);
 int w_scale(lua_State *L);
 int w_translate(lua_State *L);
 int w_shear(lua_State *L);
+int w_origin(lua_State *L);
 int w_hasFocus(lua_State *L);
 extern "C" LOVE_EXPORT int luaopen_love_graphics(lua_State *L);
 

src/scripts/boot.lua

@@ -369,6 +369,7 @@ function love.init()
 				love.event.pump()
 				love.graphics.setBackgroundColor(89, 157, 220)
 				love.graphics.clear()
+				love.graphics.origin()
 				love.graphics.print(msg, 70, 70)
 				love.graphics.present()
 				love.graphics.setBackgroundColor(0, 0, 0)
@@ -416,6 +417,7 @@ function love.run()
 		if love.update then love.update(dt) end -- will pass 0 if love.timer is disabled
 		if love.graphics then
 			love.graphics.clear()
+			love.graphics.origin()
 			if love.draw then love.draw() end
 		end
 
@@ -709,6 +711,7 @@ function love.errhand(msg)
 	local trace = debug.traceback()
 
 	love.graphics.clear()
+	love.graphics.origin()
 
 	local err = {}
 
@@ -772,6 +775,7 @@ function love.releaseerrhand(msg)
 	love.graphics.setColor(255, 255, 255, 255)
 
 	love.graphics.clear()
+	love.graphics.origin()
 
 	local err = {}
 

src/scripts/boot.lua.h

@@ -642,6 +642,8 @@ const unsigned char boot_lua[] =
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@@ -714,6 +716,8 @@ const unsigned char boot_lua[] =
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@@ -1713,6 +1717,8 @@ const unsigned char boot_lua[] =
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@@ -1803,6 +1809,8 @@ const unsigned char boot_lua[] =
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