allocate memory for the buffer before using it

MshViewer/Source/OpenGlController.cpp

@@ -11,7 +11,7 @@
 
 #define VERTEX_SHADER "Shader/TextureShader.vert"
 #define FRAGMENT_SHADER "Shader/TextureShader.frag"
-
+#define MAX_MODEL_COUNT 1000
 
 /////////////////////////////////////////////////////////////////////////
 // public constructor/destructor
@@ -113,6 +113,9 @@ void OpenGLController::processInit()
 	glVertexAttribDivisor(4, 1);
 	glVertexAttribDivisor(5, 1);
 
+	// set buffer size
+	glBufferData(GL_ARRAY_BUFFER, MAX_MODEL_COUNT * sizeof(glm::mat4), NULL, GL_STREAM_DRAW);
+
 	// get the painter ready
 	try
 	{