+#endif
+
+/* Version for OpenGL (ES) >= 2.0 */
+static void fghDrawNormalVisualization20(GLint attribute_v_coord)
+{
+ GLuint vbo_coords = 0;
+
+ if (attribute_v_coord != -1) {
+ fghGenBuffers(1, &vbo_coords);
+ fghBindBuffer(FGH_ARRAY_BUFFER, vbo_coords);
+ fghBufferData(FGH_ARRAY_BUFFER, numNormalVertices * 3 * sizeof(verticesForNormalVisualization[0]),
+ verticesForNormalVisualization, FGH_STATIC_DRAW);
+ }
+
+
+ if (vbo_coords) {
+ fghEnableVertexAttribArray(attribute_v_coord);
+ fghBindBuffer(FGH_ARRAY_BUFFER, vbo_coords);
+ fghVertexAttribPointer(
+ attribute_v_coord, /* attribute */
+ 3, /* number of elements per vertex, here (x,y,z) */
+ GL_FLOAT, /* the type of each element */
+ GL_FALSE, /* take our values as-is */
+ 0, /* no extra data between each position */
+ 0 /* offset of first element */
+ );
+ fghBindBuffer(FGH_ARRAY_BUFFER, 0);
+ }
+
+ glDrawArrays(GL_LINES, 0, numNormalVertices);
+
+ if (vbo_coords != 0)
+ fghDisableVertexAttribArray(attribute_v_coord);
+
+ if (vbo_coords != 0)
+ fghDeleteBuffers(1, &vbo_coords);
+
+ /* Done, free memory */
+ free(verticesForNormalVisualization);
+}