[Mesa-dev] [PATCH 18/18] mesa: Enable simultaneous transform feedback queries on different streams.

[Chris Forbes]

On Wed, Jun 11, 2014 at 7:49 PM, Iago Toral Quiroga <itoral at igalia.com> wrote:
> It should be possible to query the number of primitives written to each
> individual stream by a geometry shader in a single draw call. For that
> we need to have up to MAX_VERTEX_STREAM separate query objects.
> ---
>  src/mesa/main/mtypes.h   |  2 +-
>  src/mesa/main/queryobj.c | 17 +++++++++--------
>  2 files changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
> index 072d3ae..8394060 100644
> --- a/src/mesa/main/mtypes.h
> +++ b/src/mesa/main/mtypes.h
> @@ -2917,7 +2917,7 @@ struct gl_query_state
>
>     /** GL_EXT_transform_feedback */
>     struct gl_query_object *PrimitivesGenerated;
> -   struct gl_query_object *PrimitivesWritten;
> +   struct gl_query_object *PrimitivesWritten[MAX_VERTEX_STREAMS];
>
>     /** GL_ARB_timer_query */
>     struct gl_query_object *TimeElapsed;
> diff --git a/src/mesa/main/queryobj.c b/src/mesa/main/queryobj.c
> index 512f45a..7e84365 100644
> --- a/src/mesa/main/queryobj.c
> +++ b/src/mesa/main/queryobj.c
> @@ -144,11 +144,12 @@ _mesa_init_query_object_functions(struct dd_function_table *driver)
>
>
>  /**
> - * Return pointer to the query object binding point for the given target.
> - * \return NULL if invalid target, else the address of binding point
> + * Return pointer to the query object binding point for the given target (and
> + * stream for transform feedback queries).
> + * \return NULL if invalid target or stream, else the address of binding point
>   */
>  static struct gl_query_object **
> -get_query_binding_point(struct gl_context *ctx, GLenum target)
> +get_query_binding_point(struct gl_context *ctx, GLenum target, GLuint stream)

I think this should be `index`. It only makes sense as `stream` in the
context of transform feedback, and we may get other indexed query
object binding points in the future.

>  {
>     switch (target) {
>     case GL_SAMPLES_PASSED_ARB:
> @@ -179,7 +180,7 @@ get_query_binding_point(struct gl_context *ctx, GLenum target)
>           return NULL;
>     case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
>        if (ctx->Extensions.EXT_transform_feedback)
> -         return &ctx->Query.PrimitivesWritten;
> +         return &ctx->Query.PrimitivesWritten[stream];
>        else
>           return NULL;
>     default:
> @@ -240,7 +241,7 @@ _mesa_DeleteQueries(GLsizei n, const GLuint *ids)
>           if (q) {
>              if (q->Active) {
>                 struct gl_query_object **bindpt;
> -               bindpt = get_query_binding_point(ctx, q->Target);
> +               bindpt = get_query_binding_point(ctx, q->Target, q->Stream);
>                 assert(bindpt); /* Should be non-null for active q. */
>                 if (bindpt) {
>                    *bindpt = NULL;
> @@ -313,7 +314,7 @@ _mesa_BeginQueryIndexed(GLenum target, GLuint index, GLuint id)
>
>     FLUSH_VERTICES(ctx, 0);
>
> -   bindpt = get_query_binding_point(ctx, target);
> +   bindpt = get_query_binding_point(ctx, target, index);
>     if (!bindpt) {
>        _mesa_error(ctx, GL_INVALID_ENUM, "glBeginQuery{Indexed}(target)");
>        return;
> @@ -391,7 +392,7 @@ _mesa_EndQueryIndexed(GLenum target, GLuint index)
>
>     FLUSH_VERTICES(ctx, 0);
>
> -   bindpt = get_query_binding_point(ctx, target);
> +   bindpt = get_query_binding_point(ctx, target, index);
>     if (!bindpt) {
>        _mesa_error(ctx, GL_INVALID_ENUM, "glEndQuery{Indexed}(target)");
>        return;
> @@ -518,7 +519,7 @@ _mesa_GetQueryIndexediv(GLenum target, GLuint index, GLenum pname,
>        }
>     }
>     else {
> -      bindpt = get_query_binding_point(ctx, target);
> +      bindpt = get_query_binding_point(ctx, target, index);
>        if (!bindpt) {
>           _mesa_error(ctx, GL_INVALID_ENUM, "glGetQuery{Indexed}iv(target)");
>           return;
> --
> 1.9.1
>
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