glthread: track for each VAO whether the user has set a user pointer

This commit mainly adds basic infrastructure for tracking vertex array
state.

If glthread gets a non-VBO pointer, this commit delays disabling
glthread until glDraw is called. The next will change that to "sync"
instead of "disable".

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3948>

src/mesa/main/glthread.h

@@ -46,9 +46,17 @@
 #include <inttypes.h>
 #include <stdbool.h>
 #include "util/u_queue.h"
+#include "GL/gl.h"
 
 enum marshal_dispatch_cmd_id;
 struct gl_context;
+struct _mesa_HashTable;
+
+struct glthread_vao {
+   GLuint Name;
+   bool HasUserPointer;
+   bool IndexBufferIsUserPointer;
+};
 
 /** A single batch of commands queued up for execution. */
 struct glthread_batch
@@ -83,6 +91,12 @@ struct glthread_state
    /** Index of the batch being filled and about to be submitted. */
    unsigned next;
 
+   /** Vertex Array objects tracked by glthread independently of Mesa. */
+   struct _mesa_HashTable *VAOs;
+   struct glthread_vao *CurrentVAO;
+   struct glthread_vao *LastLookedUpVAO;
+   struct glthread_vao DefaultVAO;
+
    /**
     * Tracks on the main thread side whether the current vertex array binding
     * is in a VBO.
@@ -93,7 +107,6 @@ struct glthread_state
     * Tracks on the main thread side whether the current element array (index
     * buffer) binding is in a VBO.
     */
-   bool element_array_is_vbo;
    bool draw_indirect_buffer_is_vbo;
 };
 
@@ -106,4 +119,11 @@ void _mesa_glthread_flush_batch(struct gl_context *ctx);
 void _mesa_glthread_finish(struct gl_context *ctx);
 void _mesa_glthread_finish_before(struct gl_context *ctx, const char *func);
 
+void _mesa_glthread_BindVertexArray(struct gl_context *ctx, GLuint id);
+void _mesa_glthread_DeleteVertexArrays(struct gl_context *ctx,
+                                       GLsizei n, const GLuint *ids);
+void _mesa_glthread_GenVertexArrays(struct gl_context *ctx,
+                                    GLsizei n, GLuint *arrays);
+void _mesa_glthread_AttribPointer(struct gl_context *ctx);
+
 #endif /* _GLTHREAD_H*/