[Piglit] [PATCH] ext_framebuffer_multisample: check for num_samples<=1

[Brian Paul]

Even if GL_ARB_multisample is advertised, it's OK for the max number of
samples to be zero.  Add a check for that (and treat GL_MAX_SAMPLES=1
to mean no multisampling also).

Fixes http://bugs.freedesktop.org/show_bug.cgi?id=59873
---
 .../ext_framebuffer_multisample/interpolation.cpp  |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/spec/ext_framebuffer_multisample/interpolation.cpp b/tests/spec/ext_framebuffer_multisample/interpolation.cpp
index 559487d..d2d4b4b 100644
--- a/tests/spec/ext_framebuffer_multisample/interpolation.cpp
+++ b/tests/spec/ext_framebuffer_multisample/interpolation.cpp
@@ -363,10 +363,12 @@ piglit_init(int argc, char **argv)
 	piglit_require_extension("GL_ARB_framebuffer_object");
 	piglit_require_extension("GL_ARB_vertex_array_object");
 
-	/* Skip the test if num_samples > GL_MAX_SAMPLES */
+	/* Skip the test if num_samples > GL_MAX_SAMPLES or if we don't
+	 * really support multisampling.
+	 */
 	GLint max_samples;
 	glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
-	if (num_samples > max_samples)
+	if (max_samples <= 1 || num_samples > max_samples)
 		piglit_report_result(PIGLIT_SKIP);
 
 	singlesampled_fbo.setup(FboConfig(0, pattern_width,
-- 
1.7.3.4