intel: create a private gl_array_object for intel_clear_tris(), fix bug 21638

gl_array_object encapsulates a set of vertex arrays (see the
GL_APPLE_vertex_array_object extension).
Create a private gl_array_object for drawing the quad for intel_clear_tris()
so we don't have to worry about the user's vertex array state.
This fixes the no-op glClear bug #21638 and removes the need to call
_mesa_PushClientAttrib() and _mesa_PopClientAttrib().

1 files changed, 8 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_context.h b/src/mesa/drivers/dri/intel/intel_context.h
index d798225ddd..f45e24ca3a 100644
--- a/src/mesa/drivers/dri/intel/intel_context.h
+++ b/src/mesa/drivers/dri/intel/intel_context.h
@@ -215,6 +215,14 @@ struct intel_context
    GLuint ClearColor565;
    GLuint ClearColor8888;
 
+   /* info for intel_clear_tris() */
+   struct
+   {
+      struct gl_array_object *arrayObj;
+      GLfloat vertices[4][3];
+      GLfloat color[4][4];
+   } clear;
+
    /* Offsets of fields within the current vertex:
     */
    GLuint coloroffset;