Minor changes

src/main.c

@@ -6,6 +6,8 @@ int main(int argc, char *argv[])
 
   ScreenInit(800,400);
 
+  ScreenSetPixel(0,1,1);
+  
   while (!WindowShouldClose()){
     ScreenUpdate();
   }

src/screen.c

@@ -1,17 +1,48 @@
 #include "screen.h"
 
+SCREEN_DATA Screen; 
+
 void ScreenInit(int width, int height){
+  // Init emulated screen:
+  Screen.width=width;
+  Screen.height=height;
+  int px_width=width/64;
+  int px_height=height/32;
+  Screen.pixel=(px_width < px_height) ? px_width: px_height;
+  Screen.originX=(width-64*Screen.pixel)/2;
+  Screen.originY=(height-32*Screen.pixel)/2;
+  ScreenClear();
+  
   InitWindow(width, height, "Chip-8 Emulator");
   SetTargetFPS(60); // Set game to run at 60 frames-per-second
 }
 
+void ScreenClear() {
+  for(int i=0;i<64*32;i++){
+    Screen.pixels[i]=0;
+  }
+}
+
 void ScreenUpdate(){
   BeginDrawing();
   ClearBackground(RAYWHITE);
-  DrawText("Congrats! You created your first window!", 190, 200, 20, LIGHTGRAY);
+  //  DrawText("Congrats! You created your first window!", 190, 200, 20, LIGHTGRAY);
+  for(int x=0;x<64;x++){
+    for(int y=0;y<32;y++){
+      if(Screen.pixels[x+y*64] == 0)
+        DrawRectangle(Screen.originX+Screen.pixel*x,Screen.originY+Screen.pixel*y,Screen.pixel,Screen.pixel,BLACK);
+      else
+        DrawRectangle(Screen.originX+Screen.pixel*x,Screen.originY+Screen.pixel*y,Screen.pixel,Screen.pixel,WHITE);
+    }
+  }  
+
   EndDrawing();
 }
 
+void ScreenSetPixel(int x, int y, char state){
+  Screen.pixels[x+y*64]=(state==0) ? 0: 1;
+}
+
 void ScreenFinish(){
   CloseWindow(); // Close window and OpenGL context
 }

src/screen.h

@@ -1,8 +1,18 @@
 #include "raylib.h"
 
-#define MODE_CHIP8 0 // Chip-8
-#define MODE_SCHIP 1 // Super-Chip
+#define MODE_CHIP8 0 // Chip-8 64x32
+#define MODE_SCHIP 1 // Super-Chip 128x64
+
+typedef struct SCREEN_DATA {
+  int width, height;
+  int originX;
+  int originY;
+  int pixel;
+  char pixels[64*32];
+} SCREEN_DATA;
 
 void ScreenInit(int width, int height);
+void ScreenClear();
+void ScreenSetPixel(int x, int y, char state);
 void ScreenUpdate();
 void ScreenFinish();