Never mind: I solved it (made an error with the unsigned char assignment). Sorry.
However, there is still something I'd like to ask. Using glReadPixels to get pixel information is very slow. What alternative could be used? Maybe PBO's?
Never mind: I solved it (made an error with the unsigned char assignment). Sorry.
However, there is still something I'd like to ask. Using glReadPixels to get pixel information is very slow. What alternative could be used? Maybe PBO's?
PBO can help make glReadPixels a async operation. That way, you can hide the latency if you don't need the pixel values *immediatly* after the call to glReadPixels.
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);
