Add buffer stats to love.graphics.getStats.

- Add 'buffers' field, to count the total number of graphics buffer objects.
- Add 'buffermemory' field, to estimate the total number of bytes of graphics memory used by all buffers.

src/modules/graphics/Buffer.cpp

@@ -29,6 +29,9 @@ namespace graphics
 
 love::Type Buffer::type("GraphicsBuffer", &Object::type);
 
+int Buffer::bufferCount = 0;
+int64 Buffer::totalGraphicsMemory = 0;
+
 Buffer::Buffer(Graphics *gfx, const Settings &settings, const std::vector<DataDeclaration> &bufferformat, size_t size, size_t arraylength)
 	: arrayLength(0)
 	, arrayStride(0)
@@ -240,10 +243,15 @@ Buffer::Buffer(Graphics *gfx, const Settings &settings, const std::vector<DataDe
 	if (texelbuffer && arraylength * dataMembers.size() > caps.limits[Graphics::LIMIT_TEXEL_BUFFER_SIZE])
 		throw love::Exception("Cannot create texel buffer: total number of values in the buffer (%d * %d) is too large for this system (maximum %d).",
 			(int) dataMembers.size(), (int) arraylength, caps.limits[Graphics::LIMIT_TEXEL_BUFFER_SIZE]);
+
+	++bufferCount;
+	totalGraphicsMemory += size;
 }
 
 Buffer::~Buffer()
 {
+	totalGraphicsMemory -= size;
+	--bufferCount;
 }
 
 int Buffer::getDataMemberIndex(const std::string &name) const

src/modules/graphics/Buffer.h

@@ -49,6 +49,9 @@ public:
 
 	static love::Type type;
 
+	static int bufferCount;
+	static int64 totalGraphicsMemory;
+
 	static const size_t SHADER_STORAGE_BUFFER_MAX_STRIDE = 2048;
 
 	enum MapType

src/modules/graphics/Graphics.cpp

@@ -2422,8 +2422,10 @@ Graphics::Stats Graphics::getStats() const
 	stats.drawCallsBatched = drawCallsBatched;
 	stats.textures = Texture::textureCount;
 	stats.fonts = Font::fontCount;
+	stats.buffers = Buffer::bufferCount;
 	stats.textureMemory = Texture::totalGraphicsMemory;
-	
+	stats.bufferMemory = Buffer::totalGraphicsMemory;
+
 	return stats;
 }
 

src/modules/graphics/Graphics.h

@@ -230,7 +230,9 @@ public:
 		int shaderSwitches;
 		int textures;
 		int fonts;
+		int buffers;
 		int64 textureMemory;
+		int64 bufferMemory;
 	};
 
 	struct DrawCommand

src/modules/graphics/wrap_Graphics.cpp

@@ -3005,9 +3005,15 @@ int w_getStats(lua_State *L)
 	lua_pushinteger(L, stats.fonts);
 	lua_setfield(L, -2, "fonts");
 
-	lua_pushinteger(L, stats.textureMemory);
+	lua_pushinteger(L, stats.buffers);
+	lua_setfield(L, -2, "buffers");
+
+	lua_pushnumber(L, (lua_Number) stats.textureMemory);
 	lua_setfield(L, -2, "texturememory");
 
+	lua_pushnumber(L, (lua_Number) stats.bufferMemory);
+	lua_setfield(L, -2, "buffermemory");
+
 	return 1;
 }