Great News!!! Mesa 10 is out which means support for Opengl 3.3 and GLSL 3.3! This is tested on my 4th Generation Core i5 Mobile Processor with an HD 4400 Graphics chipset. Modern OpenGL development is now possible on integrated intel chipsets in linux! this is a huge step forward. Note that ubuntu 15.04 ship … Read more
VAOs act similarly to VBOs and textures with regard to how they are bound. Having a single VAO bound for the entire length of your program will yield no performance benefits because you might as well just be rendering without VAOs at all. In fact it may be slower depending on how the implementation intercepts … Read more
I think you are reading correctly the only problem is that you are not linearize the depth from buffer back to <znear…zfar> range hence the ~1 value for whole screen due to logarithmic dependence of depth (almost all the values are very close to 1). I am doing this like this: double glReadDepth(double x,double y,double … Read more