mesa: Make FEATURE_EXT_transform_feedback more modular.

This allows transformfeedback.h and st_cb_xformfb.h to be included and
used without knowing if FEATURE_EXT_transform_feedback is enabled.  Fix
build of ES overlay.

3 files changed, 14 insertions, 4 deletions

diff --git a/src/mesa/state_tracker/st_cb_xformfb.c b/src/mesa/state_tracker/st_cb_xformfb.c
index fb48b57eb5..749e88e8db 100644
--- a/src/mesa/state_tracker/st_cb_xformfb.c
+++ b/src/mesa/state_tracker/st_cb_xformfb.c
@@ -40,6 +40,8 @@
 #include "st_cb_xformfb.h"
 
 
+#if FEATURE_EXT_transform_feedback
+
 #if 0
 static struct gl_transform_feedback_object *
 st_new_transform_feedback(GLcontext *ctx, GLuint name)
@@ -127,3 +129,5 @@ st_init_xformfb_functions(struct dd_function_table *functions)
    functions->ResumeTransformFeedback = st_resume_transform_feedback;
    functions->DrawTransformFeedback = st_draw_transform_feedback;
 }
+
+#endif /* FEATURE_EXT_transform_feedback */
diff --git a/src/mesa/state_tracker/st_cb_xformfb.h b/src/mesa/state_tracker/st_cb_xformfb.h
index d6c354e5a5..50efcb9293 100644
--- a/src/mesa/state_tracker/st_cb_xformfb.h
+++ b/src/mesa/state_tracker/st_cb_xformfb.h
@@ -29,8 +29,18 @@
 #define ST_CB_XFORMFB_H
 
 
+#if FEATURE_EXT_transform_feedback
+
 extern void
 st_init_xformfb_functions(struct dd_function_table *functions);
 
+#else
+
+static INLINE void
+st_init_xformfb_functions(struct dd_function_table *functions)
+{
+}
+
+#endif /* FEATURE_EXT_transform_feedback */
 
 #endif /* ST_CB_XFORMFB_H */
diff --git a/src/mesa/state_tracker/st_context.c b/src/mesa/state_tracker/st_context.c
index 93406141f6..806f8777f2 100644
--- a/src/mesa/state_tracker/st_context.c
+++ b/src/mesa/state_tracker/st_context.c
@@ -54,9 +54,7 @@
 #include "st_cb_queryobj.h"
 #include "st_cb_readpixels.h"
 #include "st_cb_texture.h"
-#if FEATURE_EXT_transform_feedback
 #include "st_cb_xformfb.h"
-#endif
 #include "st_cb_flush.h"
 #include "st_cb_strings.h"
 #include "st_atom.h"
@@ -338,9 +336,7 @@ void st_init_driver_functions(struct dd_function_table *functions)
    st_init_flush_functions(functions);
    st_init_string_functions(functions);
 
-#if FEATURE_EXT_transform_feedback
    st_init_xformfb_functions(functions);
-#endif
 
    functions->UpdateState = st_invalidate_state;
 }