Blank window of gfx

main.c

+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+#include "gfx.h"
+
+int main(void) {
+    const int WINDOW_SIZE_X = 500;
+    const int WINDOW_SIZE_Y = 500;
+
+    srand(time(NULL));
+
+    struct gfx_context_t *ctxt = gfx_create("draw", WINDOW_SIZE_X, WINDOW_SIZE_Y);
+
+    if (!ctxt) {
+        fprintf(stderr, "Graphics initialization failed !\n");
+        return EXIT_FAILURE;
+    }
+
+    while (gfx_keypressed() != SDLK_ESCAPE){
+        gfx_present(ctxt);
+    }
+
+    gfx_destroy(ctxt);
+
+    return EXIT_SUCCESS;
+}
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