Added helper file for SDL window creation

src/sdlinit.c

@@ -0,0 +1,46 @@
+#include <SDL2/SDL.h>
+#include "config.h"
+
+static SDL_Window *window;
+static SDL_Renderer *renderer;
+static SDL_Texture *texture;
+
+void initWindow(){
+    if (SDL_Init(SDL_INIT_VIDEO)){
+        printf("Could not init SDL: %s\n", SDL_GetError());
+        exit(EXIT_FAILURE);
+    }
+    
+    atexit(SDL_Quit);
+    
+    window = SDL_CreateWindow("LS7 Emulator", 
+                              SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+                              SCREEN_WIDTH, SCREEN_HEIGHT, 0);
+    if (window == NULL){
+        printf("Fatal! Could not create SDL Window: %s\n", SDL_GetError());
+        exit(EXIT_FAILURE);
+    }
+    
+    renderer = SDL_CreateRenderer(window, -1, 2);
+    if (renderer == NULL){
+        printf("Fatal! Could not create SDL Renderer: %s\n", SDL_GetError());
+        exit(EXIT_FAILURE);
+    }
+    
+    texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA8888,
+                                SDL_TEXTUREACCESS_STREAMING,
+                                SCREEN_WIDTH, SCREEN_HEIGHT);
+    if (texture == NULL){
+        printf("Fatal! Could not create SDL Texture: %s\n", SDL_GetError());
+        exit(EXIT_FAILURE);
+    }
+    
+    if (SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_NONE)){
+        printf("Fatal! Could not set SDL blend mode: %s\n", SDL_GetError());
+        exit(EXIT_FAILURE);
+    }
+}
+
+void clearScreen(uint32_t pixels[], uint32_t color){
+    for (uint32_t i = 0; i < SDL_X_SIZE * SDL_Y_SIZE; i++) pixels[i] = color;
+}