Extend st_api_type and st_attachment_type.

Add ST_API_COUNT and ST_ATTACHMENT_COUNT for the numbers of apis and
attachments.  Add ST_ATTACHMENT_INVALID (-1) to denote an invalid
attachment.

1 files changed, 5 insertions, 0 deletions

diff --git a/st_api.h b/st_api.h
index ec4267f..8feaade 100644
--- a/st_api.h
+++ b/st_api.h
@@ -58,6 +58,8 @@ enum st_api_type {
    ST_API_OPENGL_ES1,
    ST_API_OPENGL_ES2,
    ST_API_OPENVG,
+
+   ST_API_COUNT
 };
 
 /**
@@ -81,6 +83,9 @@ enum st_attachment_type {
    ST_ATTACHMENT_DEPTH_STENCIL,
    ST_ATTACHMENT_ACCUM,
    ST_ATTACHMENT_SAMPLE,
+
+   ST_ATTACHMENT_COUNT,
+   ST_ATTACHMENT_INVALID = -1
 };
 
 /* for buffer_mask in st_visual */