Marek Olšák <mar...@gmail.com> writes: > This is adds a new driver function to retrieve the timestamp.
> diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
> index a83d367..7a507ce 100644
> --- a/src/mesa/main/get.c
> +++ b/src/mesa/main/get.c
> @@ -1807,7 +1811,18 @@ find_custom_value(struct gl_context *ctx, const struct
> value_desc *d, union valu
> case GL_UNIFORM_BUFFER_BINDING:
> v->value_int = ctx->UniformBuffer->Name;
> break;
> - }
> + /* GL_ARB_timer_query */
> + case GL_TIMESTAMP:
> + if (ctx->Driver.GetTimestamp) {
> + /* Discard the last bit to convert it to a signed integer. */
> + v->value_int64 =
> + ctx->Driver.GetTimestamp(ctx) & 0x7fffffffffffffffull;
> + }
Why wouldn't you just leave the top bit in place? Otherwise, the driver
will have to truncate its query results to 63 bits and advertise 63 for
QUERY_COUNTER_BITS as well, so that correspondence is maintained. .
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