meta: Do power of two samples check only for samples > 0

otherwise samples=0 passes the check, which is invalid.

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Neil Roberts <neil@linux.intel.com>

diff --git a/src/mesa/drivers/common/meta_blit.c b/src/mesa/drivers/common/meta_blit.c
index 3406be1ed1cefb1f758ef44dcbff905563d83f30..971a2ff1debdaf45a7e5f7859775f693f61400c7 100644 (file)
--- a/src/mesa/drivers/common/meta_blit.c
+++ b/src/mesa/drivers/common/meta_blit.c
@@ -82,7 +82,7 @@ setup_glsl_msaa_blit_scaled_shader(struct gl_context *ctx,
    y_scale = samples * 0.5;
 
    /* We expect only power of 2 samples in source multisample buffer. */
-   assert((samples & (samples - 1)) == 0);
+   assert(samples > 0 && (samples & (samples - 1)) == 0);
    while (samples >> (shader_offset + 1)) {
       shader_offset++;
    }
@@ -261,7 +261,7 @@ setup_glsl_msaa_blit_shader(struct gl_context *ctx,
    }
 
    /* We expect only power of 2 samples in source multisample buffer. */
-   assert((samples & (samples - 1)) == 0);
+   assert(samples > 0 && (samples & (samples - 1)) == 0);
    while (samples >> (shader_offset + 1)) {
       shader_offset++;
    }