Igalia contributions to Intel OpenGL 4.5 certified drivers

Igalia has contributed several features and bugfixes that helped achieve this important milestone. During the last several months, Igalia has been working hard on improving the Intel driver to enable 64-bit floating point support. We developed OpenGL extensions such as ARB_gpu_shader_fp64 and ARB_vertex_attrib_64bit, which were a major contributor to increasing the supported OpenGL version. As members of the Khronos Group, Igalia also had the opportunity to contribute tests and bugfixes to the conformance suite itself.