intel: Refactor intel_downsample_for_dri2_flush

Move it from intel_screen.c to intel_context.c. Redeclare as non-static.
A future commit will use it in multiple files.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index a39462bbb56..c37d89d1150 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -241,6 +241,36 @@ intelGetString(struct gl_context * ctx, GLenum name)
    }
 }
 
+void
+intel_downsample_for_dri2_flush(struct intel_context *intel,
+                                __DRIdrawable *drawable)
+{
+   if (intel->gen < 6) {
+      /* MSAA is not supported, so don't waste time checking for
+       * a multisample buffer.
+       */
+      return;
+   }
+
+   struct gl_framebuffer *fb = drawable->driverPrivate;
+   struct intel_renderbuffer *rb;
+
+   /* Usually, only the back buffer will need to be downsampled. However,
+    * the front buffer will also need it if the user has rendered into it.
+    */
+   static const gl_buffer_index buffers[2] = {
+         BUFFER_BACK_LEFT,
+         BUFFER_FRONT_LEFT,
+   };
+
+   for (int i = 0; i < 2; ++i) {
+      rb = intel_get_renderbuffer(fb, buffers[i]);
+      if (rb == NULL || rb->mt == NULL)
+         continue;
+      intel_miptree_downsample(intel, rb->mt);
+   }
+}
+
 static void
 intel_flush_front(struct gl_context *ctx)
 {