From e949a803f887865d6735960f56aee1770c1b221d Mon Sep 17 00:00:00 2001
From: moto999999 <juan1999l@gmail.com>
Date: Tue, 22 Feb 2022 17:47:47 +0100
Subject: [PATCH] main: Implement keyboard controls

---
 Chip 8/main.cpp | 58 ++++++++++++++++++++++++++++++++++++++++++++++---
 README.md       | 18 +++++++++++++++
 2 files changed, 73 insertions(+), 3 deletions(-)

diff --git a/Chip 8/main.cpp b/Chip 8/main.cpp
index 7c84557..d4f5190 100644
--- a/Chip 8/main.cpp	
+++ b/Chip 8/main.cpp	
@@ -16,6 +16,9 @@ bool init(SDL_Window** window, SDL_Renderer** renderer);
 //Frees media and shuts down SDL
 void close(SDL_Window** window, SDL_Renderer** renderer);
 
+// Handles key presses
+void handleEvent(SDL_Event* e, Chip8* chip8);
+
 int main(int argc, char* args[])
 {
 	//The window we'll be rendering to
@@ -63,6 +66,7 @@ int main(int argc, char* args[])
 					{
 						quit = true;
 					}
+					handleEvent(&e, &chip8);
 				}
 
 				/*
@@ -88,10 +92,9 @@ int main(int argc, char* args[])
 							}
 						}
 					chip8.drawFlag = false; // The screen has been updated, disable the flag
-
-					//Update screen
-					SDL_RenderPresent(renderer);
 				}
+				//Update screen
+				SDL_RenderPresent(renderer);
 			}
 		}
 	}
@@ -154,3 +157,52 @@ void close(SDL_Window** window, SDL_Renderer** renderer)
 	//Quit SDL subsystems
 	SDL_Quit();
 }
+
+void handleEvent(SDL_Event* e, Chip8* chip8) {
+	// Check if a button is pressed
+	if (e->type == SDL_KEYDOWN && e->key.repeat == 0)
+	{
+		switch (e->key.keysym.sym)
+		{ // If pressed update key array in chip8 object
+		case SDLK_1: chip8->key[0] = 1; break;
+		case SDLK_2: chip8->key[1] = 1; break;
+		case SDLK_3: chip8->key[2] = 1; break;
+		case SDLK_4: chip8->key[3] = 1; break;
+		case SDLK_q: chip8->key[4] = 1; break;
+		case SDLK_w: chip8->key[5] = 1; break;
+		case SDLK_e: chip8->key[6] = 1; break;
+		case SDLK_r: chip8->key[7] = 1; break;
+		case SDLK_a: chip8->key[8] = 1; break;
+		case SDLK_s: chip8->key[9] = 1; break;
+		case SDLK_d: chip8->key[10] = 1; break;
+		case SDLK_f: chip8->key[11] = 1; break;
+		case SDLK_z: chip8->key[12] = 1; break;
+		case SDLK_x: chip8->key[13] = 1; break;
+		case SDLK_c: chip8->key[14] = 1; break;
+		case SDLK_v: chip8->key[15] = 1; break;
+		}
+	}
+	// Check if a button is released
+	else if (e->type == SDL_KEYUP && e->key.repeat == 0)
+	{
+		switch (e->key.keysym.sym)
+		{// If released update key array in chip8 object
+		case SDLK_1: chip8->key[0] = 0; break;
+		case SDLK_2: chip8->key[1] = 0; break;
+		case SDLK_3: chip8->key[2] = 0; break;
+		case SDLK_4: chip8->key[3] = 0; break;
+		case SDLK_q: chip8->key[4] = 0; break;
+		case SDLK_w: chip8->key[5] = 0; break;
+		case SDLK_e: chip8->key[6] = 0; break;
+		case SDLK_r: chip8->key[7] = 0; break;
+		case SDLK_a: chip8->key[8] = 0; break;
+		case SDLK_s: chip8->key[9] = 0; break;
+		case SDLK_d: chip8->key[10] = 0; break;
+		case SDLK_f: chip8->key[11] = 0; break;
+		case SDLK_z: chip8->key[12] = 0; break;
+		case SDLK_x: chip8->key[13] = 0; break;
+		case SDLK_c: chip8->key[14] = 0; break;
+		case SDLK_v: chip8->key[15] = 0; break;
+		}
+	}
+}
diff --git a/README.md b/README.md
index 169e303..5bc96f2 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,24 @@
 # CHIP-8 emulator
  A CHIP-8 emulator written in C++ using SDL2.
 
+## Controls
+### Keypad
+
+|   |   |   |   |
+|---|---|---|---|
+| 1 | 2 | 3 | C |
+| 4 | 5 | 6 | D |
+| 7 | 8 | 9 | E |
+| A | 0 | B | F |
+
+### Keyboard
+|   |   |   |   |
+|---|---|---|---|
+| 1 | 2 | 3 | 4 |
+| Q | W | E | R |
+| A | S | D | F |
+| Z | X | C | V |
+
 ## Dependencies
 - SDL2 2.0.20