7 // From section 7.1 (Built-In Language Variables) of the GLSL 4.10
10 // If a built-in interface block is redeclared, it must appear in
11 // the shader before any use of any member included in the
12 // built-in declaration, or a compilation error will result.
14 // This appears to be a clarification to the behaviour established for
15 // gl_PerVertex by GLSL 1.50, therefore we test it using GLSL version
18 // In this test the variable that we attempt to use before redeclaring
19 // gl_PerVertex is included in the redeclaration of gl_PerVertex.