gallium: add missing bits of the direct multi draw interface

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <!7441>

docs/gallium/screen.rst

@@ -232,6 +232,7 @@ The integer capabilities:
 * ``PIPE_CAP_DRAW_INDIRECT``: Whether the driver supports taking draw arguments
   { count, instance_count, start, index_bias } from a PIPE_BUFFER resource.
   See pipe_draw_info.
+* ``PIPE_CAP_MULTI_DRAW``: Whether the driver supports direct multi draws.
 * ``PIPE_CAP_MULTI_DRAW_INDIRECT``: Whether the driver supports
   pipe_draw_info::indirect_stride and ::indirect_count
 * ``PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS``: Whether the driver supports

src/gallium/auxiliary/util/u_screen.c

@@ -229,6 +229,7 @@ u_pipe_screen_get_param_defaults(struct pipe_screen *pscreen,
    case PIPE_CAP_CLEAR_SCISSORED:
    case PIPE_CAP_DRAW_PARAMETERS:
    case PIPE_CAP_TGSI_PACK_HALF_FLOAT:
+   case PIPE_CAP_MULTI_DRAW:
    case PIPE_CAP_MULTI_DRAW_INDIRECT:
    case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:

src/gallium/auxiliary/util/u_threaded_context.c

@@ -97,6 +97,9 @@ simplify_draw_info(struct pipe_draw_info *info)
    info->min_index = 0;
    info->max_index = ~0;
 
+   /* This shouldn't be set when merging single draws. */
+   info->increment_draw_id = false;
+
    if (info->index_size) {
       if (!info->primitive_restart)
          info->restart_index = 0;

src/gallium/auxiliary/util/u_threaded_context.h

@@ -145,7 +145,7 @@
  *    another resource's backing storage. The threaded context uses it to
  *    implement buffer invalidation. This call is always queued.
  *
- * pipe_context::multi_draw() must be implemented.
+ * PIPE_CAP_MULTI_DRAW must be supported.
  *
  *
  * Performance gotchas

src/gallium/include/pipe/p_defines.h

@@ -842,6 +842,7 @@ enum pipe_cap
    PIPE_CAP_CLEAR_SCISSORED,
    PIPE_CAP_DRAW_PARAMETERS,
    PIPE_CAP_TGSI_PACK_HALF_FLOAT,
+   PIPE_CAP_MULTI_DRAW,
    PIPE_CAP_MULTI_DRAW_INDIRECT,
    PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS,
    PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL,

src/gallium/include/pipe/p_state.h

@@ -764,7 +764,8 @@ struct pipe_draw_info
    bool has_user_indices:1;   /**< if true, use index.user_buffer */
    bool index_bounds_valid:1; /**< whether min_index and max_index are valid;
                                    they're always invalid if index_size == 0 */
-   char _pad:5;               /**< padding for memcmp */
+   bool increment_draw_id:1;  /**< whether drawid increments for direct draws */
+   char _pad:4;               /**< padding for memcmp */
 
    unsigned start_instance; /**< first instance id */
    unsigned instance_count; /**< number of instances */