TINYGL: Use realloc to increase the size of the vertex array

graphics/tinygl/memory.cpp

@@ -45,4 +45,8 @@ void *gl_zalloc(int size) {
 	return calloc(1, size);
 }
 
+void *gl_realloc(void *p, int size) {
+	return realloc(p, size);
+}
+
 } // end of namespace TinyGL

graphics/tinygl/vertex.cpp

@@ -209,12 +209,10 @@ void GLContext::glopVertex(GLParam *p) {
 	if (n >= vertex_max) {
 		GLVertex *newarray;
 		vertex_max <<= 1;    // just double size
-		newarray = (GLVertex *)gl_malloc(sizeof(GLVertex) * vertex_max);
+		newarray = (GLVertex *)gl_realloc(vertex, sizeof(GLVertex) * vertex_max);
 		if (!newarray) {
 			error("unable to allocate GLVertex array.");
 		}
-		memcpy(newarray, vertex, n * sizeof(GLVertex));
-		gl_free(vertex);
 		vertex = newarray;
 	}
 	// new vertex entry

graphics/tinygl/zbuffer.h

@@ -742,6 +742,7 @@ private:
 void gl_free(void *p);
 void *gl_malloc(int size);
 void *gl_zalloc(int size);
+void *gl_realloc(void *p, int size);
 
 } // end of namespace TinyGL