i915: Only emit program errors when INTEL_DEBUG=wm or INTEL_DEBUG=fallbacks

This makes piglit a lot more happy.  The errors are logged when
INTEL_DEBUG=fallbacks because the application is about to hit a big
software fallback.  We frequently ask people to run applications that
are hitting software fallbacks with INTEL_DEBUG=fallbacks so the we
can help them debug the reason for the software fallback.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>

1 files changed, 8 insertions, 6 deletions

diff --git a/src/mesa/drivers/dri/i915/i915_program.c b/src/mesa/drivers/dri/i915/i915_program.c
index ca1949b223e..0a600d30bef 100644
--- a/src/mesa/drivers/dri/i915/i915_program.c
+++ b/src/mesa/drivers/dri/i915/i915_program.c
@@ -442,14 +442,16 @@ i915_emit_param4fv(struct i915_fragment_program * p, const GLfloat * values)
 void
 i915_program_error(struct i915_fragment_program *p, const char *fmt, ...)
 {
-   va_list args;
+   if (unlikely((INTEL_DEBUG & (DEBUG_WM | DEBUG_FALLBACKS)) != 0)) {
+      va_list args;
 
-   fprintf(stderr, "i915_program_error: ");
-   va_start(args, fmt);
-   vfprintf(stderr, fmt, args);
-   va_end(args);
+      fprintf(stderr, "i915_program_error: ");
+      va_start(args, fmt);
+      vfprintf(stderr, fmt, args);
+      va_end(args);
 
-   fprintf(stderr, "\n");
+      fprintf(stderr, "\n");
+   }
    p->error = 1;
 }