Dear Support Team,
I don't know where to report bugs in Intel graphics drivers, so I try it here.
The GLSL shader compiler in the current driver for the HD 4000 graphics does not support explicit shader input locations in GLSL version 3.30. As a workaround it is possible to enable the extension GL_ARB_explicit_attrib_location, but this extension was added to GLSL and it should be implicitly enabled when #version 330 is used.
Thanks in advance,
Woodstock
Output from my log file:
OpenGL version: 3.3 ("3.3.0 - Build 8.15.10.2696")
OpenGL shading language version: 3.3 ("3.30 - Intel Build 8.15.10.2696")
OpenGL vendor: "Intel"
OpenGL renderer: "Intel(R) HD Graphics 4000"
OpenGL context: core profile, forward compatible
------------------------------------------------------------------------
#version 330
layout(location = 0) out vec4 fragment_color;
smooth in vec4 smooth_color;
void main()
{
fragment_color = smooth_color;
}
------------------------------------------------------------------------
Error: 0:2: 'GL_ARB_explicit_attrib_location' : extension is disabled