how to use glVertexPointer,
Members - Reputation: 101
Posted 05 August 2012 - 08:32 AM
I am pretty new to OPENGL, and could any one help me ? thanks !!
I have a texture which contains number of tiles (each tile is part of this texture).
now I want to draw all the tiles in one draw call : glDrawElements(), (every tile's vertex coordination is different).
glVertexPointer(); //set the vertex array,
glTexCoordPointer(); //set the coordinations of the tile in texture.
do I have to call glTexCoordPointer() to set the coordinations for every tile ? that will be 3 times call of above code if I want to draw 3 tiles.
is there any efficient way to handle that ?
thank you very much !!
Members - Reputation: 813
Posted 05 August 2012 - 06:27 PM
A more efficient way would be to move up to GL 1.5 and start using VBO so that your vertices will be in video memory rather than local RAM.
an open source GLU replacement library. Much more modern than GLU.
float matrix, inverse_matrix;
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);