Hi,
I have a double buffers device context. In some situations, I want to copy the contents in the front buffer to the back buffer, then add some minor rendering to the back buffer and finally call SwapBuffers(). Does OpenGL has such a copy buffer command? Please help. Thanks.
(The reason for this is that my 3rd part software is rendering first then call a callback function provided by me)
Tony
glReadBuffer(GL_FRONT);
glCopyPixels(0, 0, width, height, GL_COLOR);
but I think there is a better solution to what you are looking for.
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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);
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