diff --git a/run.sh b/run.sh
index e8a700e..980e7ca 100755
--- a/run.sh
+++ b/run.sh
@@ -1,6 +1,14 @@
 #!/bin/bash
 
-mkdir -p build
-gcc `pkg-config --static --libs glfw3` -c src/window.c -o build/window.o
-gcc `pkg-config --static --libs glfw3` build/window.o -o main src/main.c
+echo "Building..."
+rm -rf ./build
+mkdir -p ./build
+gcc -c src/log.c -o build/log.o || exit
+gcc `pkg-config --static --libs glfw3` -c src/window.c -o build/window.o || exit
+gcc `pkg-config --static --libs glfw3` \
+    `pkg-config --static --libs vulkan` \
+    build/log.o \
+    build/window.o \
+    -o main src/main.c || exit
+echo "Done. Starting app..."
 ./main
diff --git a/src/log.c b/src/log.c
new file mode 100644
index 0000000..217f0d0
--- /dev/null
+++ b/src/log.c
@@ -0,0 +1,37 @@
+#include "log.h"
+#include <stdio.h>
+#include <time.h>
+#include <string.h>
+
+int logLevel = 0;
+
+// TODO
+/*const char* timeStr() {
+    time_t now = time(NULL);
+    struct tm * p = localtime(&now);
+    char buffer[25];
+    strftime(buffer, 25, "%Y-%m-%d %H:%M:%S", p);
+    //buffer[24] = '\0';
+    const char* str = buffer;
+    return str;
+}*/
+
+void vkeSetLogLevel(int level) {
+    logLevel = level;
+}
+
+void vkeLogDebug(const char* message) {
+    if(logLevel == 0) {
+        time_t now;
+        time(&now);
+        printf("%s [DEBUG] %s\n", ctime(&now), message);
+    }
+}
+
+void vkeLogError(const char* message) {
+    if(logLevel > 0) {
+        time_t now;
+        time(&now);
+        printf("%s [ERROR] %s\n", ctime(&now), message);
+    }
+}
diff --git a/src/log.h b/src/log.h
new file mode 100644
index 0000000..8923468
--- /dev/null
+++ b/src/log.h
@@ -0,0 +1,16 @@
+#ifndef VKE_LOG_H
+#define VKE_LOG_H
+
+#define VKE_LOG_DEBUG = 0
+#define VKE_LOG_ERROR = 1
+
+// Sets the global log level (VKE_LOG_DEBUG by default).
+void vkeSetLogLevel(int level);
+
+// Logs the given message with the DEBUG tag.
+void vkeLogDebug(const char* message);
+
+// Logs the given message with the ERROR tag.
+void vkeLogError(const char* message);
+
+#endif
diff --git a/src/main.c b/src/main.c
index a2c850d..8e6e690 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,97 @@
 #include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
 #include <GLFW/glfw3.h>
+#include <vulkan/vulkan.h>
+#include "log.h"
 #include "window.h"
 
+struct VKEContext {
+    VkInstance instance;
+};
+
+struct VKEConfig {
+    const char* title;
+    int validationLayerCount;
+    const char** validationLayers;
+};
+
+bool vkeCheckValidationLayerSupport(const char** validationLayers, int n) {
+    if(n == 0) {
+        return true;
+    }
+
+    uint32_t layerCount;
+    vkEnumerateInstanceLayerProperties(&layerCount, NULL);
+    VkLayerProperties availableLayers[layerCount];
+    vkEnumerateInstanceLayerProperties(&layerCount, availableLayers);
+
+    for(int i = 0; i < n; i++) {
+        bool layerFound = false;
+
+        for(int j = 0; j < layerCount; j++) {
+            if(strcmp(validationLayers[i], availableLayers[j].layerName) == 0) {
+                layerFound = true;
+                break;
+            }
+        }
+
+        if(!layerFound) {
+            // log supported validation layers
+            for(int j = 0; j < layerCount; j++) {
+                vkeLogDebug(availableLayers[j].layerName);
+            }
+
+            return false;
+        }
+    }
+
+    return true;
+}
+
+int vkeInit(struct VKEContext* ctx, struct VKEConfig* config) {
+    if(!vkeCheckValidationLayerSupport(config->validationLayers, config->validationLayerCount)) {
+        vkeLogError("validation layer not supported\n");
+        return -1;
+    }
+
+    uint32_t glfwExtensionCount = 0;
+    const char** glfwExtensions;
+    glfwExtensions = glfwGetRequiredInstanceExtensions(&glfwExtensionCount);
+    VkApplicationInfo appInfo = {
+        .sType = VK_STRUCTURE_TYPE_APPLICATION_INFO,
+        .pApplicationName = config->title,
+        .applicationVersion = VK_MAKE_VERSION(1, 0, 0),
+        .pEngineName = "No Engine",
+        .engineVersion = VK_MAKE_VERSION(1, 0, 0),
+        .apiVersion = VK_API_VERSION_1_0
+    };
+    VkInstanceCreateInfo createInfo = {
+        .sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO,
+        .enabledExtensionCount = glfwExtensionCount,
+        .ppEnabledExtensionNames = glfwExtensions,
+        .enabledLayerCount = 0,
+        .pApplicationInfo = &appInfo
+    };
+
+    // TODO
+    /*if(config->validationLayerCount > 0) {
+        createInfo.enabledLayerCount = config->validationLayerCount;
+        createInfo.ppEnabledExtensionNames = config->validationLayers;
+    }*/
+    
+    if(vkCreateInstance(&createInfo, NULL, &ctx->instance) != VK_SUCCESS) {
+        vkeLogError("error creating vulkan instance\n");
+        return -2;
+    }
+
+    return 0;
+}
+
+void vkeDestroy(struct VKEContext* ctx) {
+    vkDestroyInstance(ctx->instance, NULL);
+}
+
 void loop(GLFWwindow* window) {
     while(!glfwWindowShouldClose(window)) {
         // ...
@@ -10,13 +100,30 @@ void loop(GLFWwindow* window) {
 }
 
 int main(int argc, const char *argv[]) {
-    GLFWwindow* window = vkeCreateWindow("Test", 800, 600);
+    vkeSetLogLevel(0);
+    const char* title = "Test";
+    GLFWwindow* window = vkeCreateWindow(title, 800, 600);
 
     if(window == NULL) {
         return -1;
     }
 
+    struct VKEContext ctx;
+    const char* validationLayers[] = {
+        "VK_LAYER_KHRONOS_validation"
+    };
+    struct VKEConfig config = {
+        .title = title,
+        .validationLayerCount = 1,
+        .validationLayers = validationLayers
+    };
+
+    if(vkeInit(&ctx, &config) != 0) {
+        return -1;
+    }
+
     loop(window);
     vkeDestroyWindow(window);
+    vkeDestroy(&ctx);
     return 0;
 }