intel / DRI2: Track and flush front-buffer rendering

Track two flags:  whether or not front-buffer rendering is currently
enabled and whether or not front-buffer rendering has been enabled
since the last glFlush.  If the second flag is set, the front-buffer
is flushed via a loader call back.  If the first flag is cleared, the
second flag is cleared at this time.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kristian Høgsberg <krh@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_buffers.c b/src/mesa/drivers/dri/intel/intel_buffers.c
index 0929a2c223..f1249f7635 100644
--- a/src/mesa/drivers/dri/intel/intel_buffers.c
+++ b/src/mesa/drivers/dri/intel/intel_buffers.c
@@ -202,6 +202,8 @@ intel_draw_buffer(GLcontext * ctx, struct gl_framebuffer *fb)
 	       intel_batchbuffer_flush(intel->batch);
 	    intel->front_cliprects = GL_TRUE;
 	    colorRegions[0] = intel_get_rb_region(fb, BUFFER_FRONT_LEFT);
+
+	    intel->front_buffer_dirty = GL_TRUE;
 	 }
 	 else {
 	    if (!intel->constant_cliprect && intel->front_cliprects)
@@ -319,6 +321,12 @@ intel_draw_buffer(GLcontext * ctx, struct gl_framebuffer *fb)
 static void
 intelDrawBuffer(GLcontext * ctx, GLenum mode)
 {
+   if (ctx->DrawBuffer->Name == 0) {
+      struct intel_context *const intel = intel_context(ctx);
+
+      intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT);
+   }
+
    intel_draw_buffer(ctx, ctx->DrawBuffer);
 }