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mesa: Keep track of the last looked-up VAO 

This saves the cost of repeated hash table lookups when the same
vertex array object is referenced in a sequence of calls such as:

    glVertexArrayAttribFormat(vao, ...);
    glVertexArrayAttribBinding(vao, ...);
    glEnableVertexArrayAttrib(vao, ...);
    ...

Note that VAO's are container objects that are not shared between
contexts.

Reviewed-by: Laura Ekstrand <laura@jlekstrand.net>
This commit is contained in:
Fredrik Höglund 2015-03-02 18:25:45 +01:00
parent 2830c2fbeb
commit 6c37acfbed
2 changed files with 27 additions and 13 deletions
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37
src/mesa/main/arrayobj.c
View File

@ -100,20 +100,28 @@ _mesa_lookup_vao_err(struct gl_context *ctx, GLuint id, const char *caller)
return ctx->Array.DefaultVAO;
} else {
struct gl_vertex_array_object *vao =
(struct gl_vertex_array_object *)
_mesa_HashLookup(ctx->Array.Objects, id);
struct gl_vertex_array_object *vao;
/* The ARB_direct_state_access specification says:
*
* "An INVALID_OPERATION error is generated if <vaobj> is not
* [compatibility profile: zero or] the name of an existing
* vertex array object."
*/
if (!vao || !vao->EverBound) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(non-existent vaobj=%u)", caller, id);
return NULL;
if (ctx->Array.LastLookedUpVAO &&
ctx->Array.LastLookedUpVAO->Name == id) {
vao = ctx->Array.LastLookedUpVAO;
} else {
vao = (struct gl_vertex_array_object *)
_mesa_HashLookup(ctx->Array.Objects, id);
/* The ARB_direct_state_access specification says:
*
* "An INVALID_OPERATION error is generated if <vaobj> is not
* [compatibility profile: zero or] the name of an existing
* vertex array object."
*/
if (!vao || !vao->EverBound) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"%s(non-existent vaobj=%u)", caller, id);
return NULL;
}
_mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, vao);
}
return vao;
@ -517,6 +525,9 @@ _mesa_DeleteVertexArrays(GLsizei n, const GLuint *ids)
/* The ID is immediately freed for re-use */
remove_array_object(ctx, obj);
if (ctx->Array.LastLookedUpVAO == obj)
_mesa_reference_vao(ctx, &ctx->Array.LastLookedUpVAO, NULL);
/* Unreference the array object.
* If refcount hits zero, the object will be deleted.
*/

3
src/mesa/main/mtypes.h
View File

@ -1674,6 +1674,9 @@ struct gl_array_attrib
/** The default vertex array object */
struct gl_vertex_array_object *DefaultVAO;
/** The last VAO accessed by a DSA function */
struct gl_vertex_array_object *LastLookedUpVAO;
/** Array objects (GL_ARB/APPLE_vertex_array_object) */
struct _mesa_HashTable *Objects;