initial commit

1 files changed, 80 insertions, 0 deletions

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..6e0388d
--- /dev/null
+++ b/main.c
@@ -0,0 +1,80 @@
+#include <SDL2/SDL.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "lookup.h"//contains a 2D array mapped to the display
+
+#define WIDTH 64
+#define HEIGHT 32
+
+int main(int argc, char *argv[])
+{
+        SDL_Window *window;
+        SDL_Renderer *renderer;
+        SDL_Texture *texture;
+        SDL_Event event;
+
+        if (SDL_Init(SDL_INIT_VIDEO) < 0)
+		{
+                SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
+                return 3;
+		}
+
+        window = SDL_CreateWindow("SDL_CreateTexture",
+                        SDL_WINDOWPOS_UNDEFINED,
+                        SDL_WINDOWPOS_UNDEFINED,
+                        WIDTH*16, HEIGHT*16,
+                        SDL_WINDOW_RESIZABLE);
+
+        renderer = SDL_CreateRenderer(window, -1, 0);
+
+        texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);//create a texture for direct pixel access
+
+	int pitch;//pixel pitch
+	int *pixels = NULL;//pointer that will later point to the pixels
+
+
+	while (1)
+		{
+		int ret = SDL_LockTexture(texture, NULL, (void **) &pixels, &pitch);//lock the texture for direct pixel access
+		if (ret != 0){SDL_Log("ret=%d pix=%p error=%s", ret, pixels, SDL_GetError());}
+
+		//display checkerboard pattern
+		int i, j;
+		for (i=0; i<32; ++i)
+			{
+			if (i % 2 == 0)
+				{
+				for (j=0; j<64; j+=2)
+					{
+					pixels[display[i][j]] = 0xFFFFFFFF; //white
+					}
+				}
+			else
+				{
+				for (j=1; j<64; j+=2)
+					{
+					pixels[display[i][j]] = 0xFFFFFFFF; //white
+					}
+				}
+			}
+
+//		pixels[2047] = 0xfff0;//blue
+
+//		pixels = pixels + pitch; //pitch doesn't need to be changed
+
+		SDL_UnlockTexture(texture);
+
+		SDL_RenderCopy(renderer, texture, NULL, NULL);//copy the texture to the rendered
+		SDL_RenderPresent(renderer);//render the texture to the renderer
+
+		//SDL delay seems to case a bug when pressing the x or Alt+F4 does not close for some time
+		SDL_Delay(80);//An ~80ms delay between redrawing and polling for SDL_QUIT saves CPU time while still retaining quick resizing and closing
+		SDL_PollEvent(&event);
+		if(event.type == SDL_QUIT){break;}
+		}
+
+	SDL_DestroyRenderer(renderer);
+	SDL_Quit();
+        return 0;
+}