Fixed SDL window rendering on macOS

main.cpp

@@ -14,13 +14,16 @@ int main() {
 
     device.setNewFrameCallback(std::bind(&nes::SdlWindow::drawFrame, &window, _1));
     //device.insertCartridge("/home/selim/Downloads/nestest.nes");
-    device.insertCartridge("C:\\Users\\selim\\Documents\\nestest.nes");
+    device.insertCartridge("/Users/selim/Documents/nestest.nes");
 
+    SDL_Event e;
     uint64_t cycles = 0;
     while (cycles < 1000000000) {
         device.tick();
         cycles++;
 
+        while(SDL_PollEvent(&e));
+
         //int64_t us = static_cast<int64_t>(1000000000.0/(60*nes::Ppu::SCREEN_WIDTH*nes::Ppu::SCREEN_HEIGHT));
         //std::this_thread::sleep_for(std::chrono::nanoseconds(1));
     }

src/Ppu.cpp

@@ -92,10 +92,17 @@ namespace nes {
                 _status.verticalBlank = 0;
             }
 
-            //
+            // Preloading some data ahead of time
             if ((_column >= 2 && _column < 258) || (_column >= 321 && _column < 338)) {
+                // Every 8 ticks extract info about next tile
+                // Spread the work across those 8 ticks
                 switch ((_column - 1) % 8) {
-
+                    case 0:
+                        _nextBgTile.id = internalRead(0x2000 + _vRamAddress.value & 0x0FFF);
+                        break;
+                    case 2:
+                        //_nextBgTile.attribute
+                        break;
                 }
             }
         }

src/Ppu.h

@@ -18,6 +18,9 @@ namespace nes {
         uint8_t G = 0;
         uint8_t B = 0;
         uint8_t A = 0xFF;
+
+        Pixel(): R{}, G{}, B{}, A{} {}
+        Pixel(uint8_t R, uint8_t G, uint8_t B): R{R}, G{G}, B{B}, A{0xFF} {}
     };
 
     class Ppu {
@@ -86,6 +89,13 @@ namespace nes {
             uint16_t value;
         };
 
+        struct TileInfo {
+            uint8_t id;
+            uint8_t attribute;
+            uint8_t lsb;
+            uint8_t msb;
+        };
+
     public:
         Ppu();
         bool tick();
@@ -114,6 +124,7 @@ namespace nes {
         bool _addressWriteInProgress;
         uint8_t _dataTemp;
         uint8_t _fineX;
+        TileInfo _nextBgTile;
 
     private:
         std::unique_ptr<uint8_t[]> _nameTable;