intel: Don't do the extra MI_FLUSH in flushing except when doing glFlush().

Everything other than "make sure the last rendering ends up visible on the
screen" doesn't need that behavior.
(cherry picked from commit 01bc4d441fd6821ad9fc20d5e9544e4e587e4ff0)

1 files changed, 17 insertions, 5 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 668d8ed2ab..5c5b1b1163 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -505,9 +505,8 @@ intelInvalidateState(GLcontext * ctx, GLuint new_state)
       intel->vtbl.invalidate_state( intel, new_state );
 }
 
-
-void
-intelFlush(GLcontext * ctx)
+static void
+intel_flush(GLcontext *ctx, GLboolean needs_mi_flush)
 {
    struct intel_context *intel = intel_context(ctx);
 
@@ -521,13 +520,26 @@ intelFlush(GLcontext * ctx)
     * lands onscreen in a timely manner, even if the X Server doesn't trigger
     * a flush for us.
     */
-   intel_batchbuffer_emit_mi_flush(intel->batch);
+   if (needs_mi_flush)
+      intel_batchbuffer_emit_mi_flush(intel->batch);
 
    if (intel->batch->map != intel->batch->ptr)
       intel_batchbuffer_flush(intel->batch);
 }
 
 void
+intelFlush(GLcontext * ctx)
+{
+   intel_flush(ctx, GL_FALSE);
+}
+
+static void
+intel_glFlush(GLcontext *ctx)
+{
+   intel_flush(ctx, GL_TRUE);
+}
+
+void
 intelFinish(GLcontext * ctx)
 {
    struct gl_framebuffer *fb = ctx->DrawBuffer;
@@ -553,7 +565,7 @@ intelInitDriverFunctions(struct dd_function_table *functions)
 {
    _mesa_init_driver_functions(functions);
 
-   functions->Flush = intelFlush;
+   functions->Flush = intel_glFlush;
    functions->Finish = intelFinish;
    functions->GetString = intelGetString;
    functions->UpdateState = intelInvalidateState;