GL extensions?

Graphics and GPU Programming Programming OpenGL

Started by ic0de December 01, 2011 02:20 AM

1 comment, last by DJLink 12 years, 5 months ago

1,014

Author

December 01, 2011 02:20 AM

What exactly are OpenGL extensions? I know they add functionality to OpenGL but why cant they just be distributed as separate libraries.

How exactly would I use an extension do I need an extra dll for it?

What code do I need to add to use them, all I want is multitexturing but I need to understand GL extensions first, can somebody explain them to me or post a link that shows me how?

thanks!

V-man

813

December 01, 2011 09:29 AM

http://www.opengl.org/wiki/OpenGL_Extensions

As for multitexturing, it went into GL in version 1.2.1 or 1.3
Check the manuals to be sure.
Therefore, it is no longer an extension.

All graphics card these days support it. All nvidia and amd chips support GL 2 and above.

Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

DJLink

207

December 01, 2011 10:46 AM

What exactly are OpenGL extensions? I know they add functionality to OpenGL but why cant they just be distributed as separate libraries.

How exactly would I use an extension do I need an extra dll for it?

What code do I need to add to use them, all I want is multitexturing but I need to understand GL extensions first, can somebody explain them to me or post a link that shows me how?

thanks!

You can use Glew to check if your extension exists, it's pretty simple.

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