Added Text Rendering

olcPixelGameEngine.h

@@ -2,7 +2,7 @@
 	olcPixelGameEngine.h 
 
 	+-------------------------------------------------------------+
-	|           OneLoneCoder Pixel Game Engine v0.4               |
+	|           OneLoneCoder Pixel Game Engine v0.5               |
 	| "Like the command prompt console one, but not..." - javidx9 |
 	+-------------------------------------------------------------+
 
@@ -118,7 +118,7 @@
 	Thanks
 	~~~~~~
 	I'd like to extend thanks to Eremiell, slavka, Phantim, JackOJC, 
-	KrossX, Huhlig, Dragoneye & MagetzUb for advice, ideas and testing, 
+	KrossX, Huhlig, Dragoneye, Appa & MagetzUb for advice, ideas and testing, 
 	and I'd like to extend my appreciation to the 13K YouTube followers 
 	and 1K Discord server members who give me the motivation to keep 
 	going with all this :D
@@ -341,6 +341,8 @@ namespace olc // All OneLoneCoder stuff will now exist in the "olc" namespace
 		// Draws an area of a sprite at location (x,y), where the 
 		// selected area is (ox,oy) to (ox+w,oy+h)
 		void DrawPartialSprite(int32_t x, int32_t y, Sprite *sprite, int32_t ox, int32_t oy, int32_t w, int32_t h);
+		// Draws a single line of text
+		void DrawString(int32_t x, int32_t y, std::string sText);
 
 	public: // Branding
 		std::string sAppName;
@@ -356,6 +358,9 @@ namespace olc // All OneLoneCoder stuff will now exist in the "olc" namespace
 		uint32_t	nMousePosX = 0;
 		uint32_t	nMousePosY = 0;
 		bool		bHasInputFocus = false;
+		float		fFrameTimer = 1.0f;
+		int			nFrameCount = 0;
+		Sprite		*fontSprite = nullptr;
 
 		static std::map<uint16_t, uint8_t> mapKeys;
 		bool		pKeyNewState[256]{ 0 };
@@ -384,6 +389,7 @@ namespace olc // All OneLoneCoder stuff will now exist in the "olc" namespace
 		// Common initialisation functions
 		void olc_UpdateMouse(uint32_t x, uint32_t y);
 		bool olc_OpenGLCreate();
+		void olc_ConstructFontSheet();
 
 #ifdef _WIN32
 		// Windows specific window handling
@@ -624,6 +630,9 @@ namespace olc
 		wsAppName = converter.from_bytes(sAppName);		
 #endif
 #endif
+		// Load the default font sheet
+		olc_ConstructFontSheet();
+
 		// Create a sprite that represents the primary drawing target
 		pDefaultDrawTarget = new Sprite(nScreenWidth, nScreenHeight);
 		SetDrawTarget(nullptr);
@@ -1068,6 +1077,18 @@ namespace olc
 		}
 	}
 
+	void PixelGameEngine::DrawString(int32_t x, int32_t y, std::string sText)
+	{
+		int32_t s = 0;
+		for (auto c : sText)
+		{
+			int32_t ox = (c - 32) % 16;
+			int32_t oy = (c - 32) / 16;
+			DrawPartialSprite(x + s, y, fontSprite, ox*8, oy*8, 8, 8);
+			s+=8;
+		}
+	}
+
 	void PixelGameEngine::SetPixelMode(Pixel::Mode m)
 	{
 		nPixelMode = m;
@@ -1248,21 +1269,32 @@ namespace olc
 #endif
 
 				// Update Title Bar
+				fFrameTimer += fElapsedTime;
+				nFrameCount++;
+				if (fFrameTimer >= 1.0f)
+				{
+					fFrameTimer -= 1.0f;					
 #ifdef _WIN32
 #ifdef UNICODE
 					wchar_t sTitle[256];
-				swprintf(sTitle, 256, L"OneLoneCoder.com - Pixel Game Engine - %s - FPS: %3.2f", wsAppName.c_str(), 1.0f / fElapsedTime);
+					swprintf(sTitle, 256, L"OneLoneCoder.com - Pixel Game Engine - %s - FPS: %d", wsAppName.c_str(), nFrameCount);
-				SetWindowText(olc_hWnd, sTitle);
 #else
+#ifndef __MINGW32__
 					char sTitle[256];
-				sprintf_s(sTitle, 256, "OneLoneCoder.com - Pixel Game Engine - %s - FPS: %3.2f", sAppName.c_str(), 1.0f / fElapsedTime);
+					sprintf_s(sTitle, 256, "OneLoneCoder.com - Pixel Game Engine - %s - FPS: %d", sAppName.c_str(), nFrameCount);
-				SetWindowText(olc_hWnd, sTitle);
+#else	
+					char sTitle[256];
+					sprintf(sTitle, "OneLoneCoder.com - Pixel Game Engine - %s - FPS: %d", sAppName.c_str(), nFrameCount);
+#endif	
 #endif
+					SetWindowText(olc_hWnd, sTitle);
 #else
 					char sTitle[256];
-				sprintf(sTitle, "OneLoneCoder.com - Pixel Game Engine - %s - FPS: %3.2f", sAppName.c_str(), 1.0f / fElapsedTime);
+					sprintf(sTitle, "OneLoneCoder.com - Pixel Game Engine - %s - FPS: %d", sAppName.c_str(), nFrameCount);
 					XStoreName(olc_Display, olc_Window, sTitle);
 #endif
+					nFrameCount = 0;
+				}
 
 
 			}
@@ -1291,6 +1323,46 @@ namespace olc
 
 	}
 
+
+	void PixelGameEngine::olc_ConstructFontSheet()
+	{
+		std::string data;
+		data += "?Q`0001oOch0o01o@F40o0<AGD4090LAGD<090@A7ch0?00O7Q`0600>00000000";
+		data += "O000000nOT0063Qo4d8>?7a14Gno94AA4gno94AaOT0>o3`oO400o7QN00000400";
+		data += "Of80001oOg<7O7moBGT7O7lABET024@aBEd714AiOdl717a_=TH013Q>00000000";
+		data += "720D000V?V5oB3Q_HdUoE7a9@DdDE4A9@DmoE4A;Hg]oM4Aj8S4D84@`00000000";
+		data += "OaPT1000Oa`^13P1@AI[?g`1@A=[OdAoHgljA4Ao?WlBA7l1710007l100000000";
+		data += "ObM6000oOfMV?3QoBDD`O7a0BDDH@5A0BDD<@5A0BGeVO5ao@CQR?5Po00000000";
+		data += "Oc``000?Ogij70PO2D]??0Ph2DUM@7i`2DTg@7lh2GUj?0TO0C1870T?00000000";
+		data += "70<4001o?P<7?1QoHg43O;`h@GT0@:@LB@d0>:@hN@L0@?aoN@<0O7ao0000?000";
+		data += "OcH0001SOglLA7mg24TnK7ln24US>0PL24U140PnOgl0>7QgOcH0K71S0000A000";
+		data += "00H00000@Dm1S007@DUSg00?OdTnH7YhOfTL<7Yh@Cl0700?@Ah0300700000000";
+		data += "<008001QL00ZA41a@6HnI<1i@FHLM81M@@0LG81?O`0nC?Y7?`0ZA7Y300080000";
+		data += "O`082000Oh0827mo6>Hn?Wmo?6HnMb11MP08@C11H`08@FP0@@0004@000000000";
+		data += "00P00001Oab00003OcKP0006@6=PMgl<@440MglH@000000`@000001P00000000";
+		data += "Ob@8@@00Ob@8@Ga13R@8Mga172@8?PAo3R@827QoOb@820@0O`0007`0000007P0";
+		data += "O`000P08Od400g`<3V=P0G`673IP0`@3>1`00P@6O`P00g`<O`000GP800000000";
+		data += "?P9PL020O`<`N3R0@E4HC7b0@ET<ATB0@@l6C4B0O`H3N7b0?P01L3R000000020";
+
+		fontSprite = new olc::Sprite(128, 48);
+		int px = 0, py = 0;
+		for (int b = 0; b < 1024; b += 4)
+		{
+			uint32_t sym1 = (uint32_t)data[b + 0] - 48;
+			uint32_t sym2 = (uint32_t)data[b + 1] - 48;
+			uint32_t sym3 = (uint32_t)data[b + 2] - 48;
+			uint32_t sym4 = (uint32_t)data[b + 3] - 48;
+			uint32_t r = sym1 << 18 | sym2 << 12 | sym3 << 6 | sym4;
+			
+			for (int i = 0; i < 24; i++)
+			{
+				int k = r & (1 << i) ? 255 : 0;
+				fontSprite->SetPixel(px, py, olc::Pixel(k, k, k));
+				if (++py == 48) { px++; py = 0; }
+			}
+		}
+	}
+
 #ifdef _WIN32
 	HWND PixelGameEngine::olc_WindowCreate()
 	{