Fix many incorrect GLSL checks

piglit_require_GLSL() only checks that shader objects and the shading
language exist.  It does *NOT* check that any particular shader stage
exists.  It is perfectly valid to have an OpenGL 1.5 implementation that
has only vertex shaders or only fragment shaders.

piglit_require_GLSL_version(110) and piglit_require_GLSL_version(120)
have the same failings as piglit_require_GLSL() and more.  GLSL 1.10 is
the minimum GLSL version that actually exists, so anything that has GLSL
has version 1.10.  GLSL 1.20 can be exposed by an implementation, so
checking that version doesn't guarantee anything either.  GLSL 1.30
implicitly requires OpenGL 3.0, so that is a strong check.

All of the non-shader drivers in Mesa advertise shader objects and GLSL
1.20 and NEITHER vertex nor fragment stages.  This fixes these tests to
just skip on those drivers.

1 files changed, 2 insertions, 1 deletions

diff --git a/tests/shaders/glsl-bug-22603.c b/tests/shaders/glsl-bug-22603.c
index 74aeb7be5..8f995aa64 100644
--- a/tests/shaders/glsl-bug-22603.c
+++ b/tests/shaders/glsl-bug-22603.c
@@ -200,7 +200,8 @@ piglit_init(int argc, char **argv)
 		"}";
 
 	piglit_require_extension("GL_EXT_framebuffer_object");
-	piglit_require_GLSL();
+	piglit_require_vertex_shader();
+	piglit_require_fragment_shader();
 
 	vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
 	fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_source);