glut:what is the fastest way to read and draw to framebuffer?

Graphics and GPU Programming Programming

Started by nickme February 06, 2012 03:50 AM

1 comment, last by nickme 12 years, 2 months ago

253

Author

February 06, 2012 03:50 AM

hi,
i wonder what is the fastest way to read and draw to framebuffer? i used glReadPixels() and glDrawPixels(). but i found it to be kind of slow, especially when the window is bigger. any idea?\

thanks

V-man

813

February 06, 2012 09:42 AM

http://www.opengl.org/wiki/Common_Mistakes#glDrawPixels

or make a texture from your pixels and draw it with a quad.

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);

nickme

253

Author

February 06, 2012 11:36 PM