diff --git a/.vs/shader2/v14/.suo b/.vs/shader2/v14/.suo
index 5874f40..8cc6f7a 100644
Binary files a/.vs/shader2/v14/.suo and b/.vs/shader2/v14/.suo differ
diff --git a/misc.cpp b/misc.cpp
index e1d10c3..e10475a 100644
--- a/misc.cpp
+++ b/misc.cpp
@@ -284,4 +284,37 @@ void SaveImage(const char*imagePath, unsigned char*imgData, int width, int heigh
 		fwrite(imgData, 1, width*height * 3, pFile);
 		fclose(pFile);
 	}
+}
+
+void CheckGLError(const char*file, int line)
+{
+
+	GLenum error = glGetError();
+	if (error != GL_NO_ERROR)
+	{
+		switch (error)
+		{
+		case  GL_INVALID_ENUM:
+			printf("GL Error GL_INVALID_ENUM %s : %d\n", file, line);
+			break;
+		case  GL_INVALID_VALUE:
+			printf("GL Error GL_INVALID_VALUE %s : %d\n", file, line);
+			break;
+		case  GL_INVALID_OPERATION:
+			printf("GL Error GL_INVALID_OPERATION %s : %d\n", file, line);
+			break;
+		case  GL_STACK_OVERFLOW:
+			printf("GL Error GL_STACK_OVERFLOW %s : %d\n", file, line);
+			break;
+		case  GL_STACK_UNDERFLOW:
+			printf("GL Error GL_STACK_UNDERFLOW %s : %d\n", file, line);
+			break;
+		case  GL_OUT_OF_MEMORY:
+			printf("GL Error GL_OUT_OF_MEMORY %s : %d\n", file, line);
+			break;
+		default:
+			printf("GL Error 0x%x %s : %d\n", error, file, line);
+			break;
+		}
+	}
 }
\ No newline at end of file
diff --git a/misc.h b/misc.h
index c333224..cd121b7 100644
--- a/misc.h
+++ b/misc.h
@@ -9,3 +9,6 @@ GLuint CreateTextureFromBMP(const char* imagePath);
 GLuint CreateTextureFromFile(const char* imagePath);
 GLuint CreateTextureFromDds(const char* imagePath);
 void SaveImage(const char* imgPath, unsigned char* imgData, int width, int height);
+
+void CheckGLError(const char* file, int line);
+#define GL_CALL(x) do{x;CheckGLError(__FILE__,__LINE__);}while(0)
diff --git a/timer.cpp b/timer.cpp
index 758151f..8e6cbc2 100644
--- a/timer.cpp
+++ b/timer.cpp
@@ -23,7 +23,7 @@ int Timer::GetPassedTickers()
 	SetThreadAffinityMask(mCurrentThread, 1);
 	QueryPerformanceCounter(&mEnd);
 	SetThreadAffinityMask(mCurrentThread, mProcessAffinityMask);
-	return mEnd.QuadPart - mStart.QuadPart;
+	return (int)(mEnd.QuadPart - mStart.QuadPart);
 }
 
 float Timer::GetPassedTime()