gallium: Create a new PIPE_CAP_TILE_RASTER_ORDER for vc4.

Because vc4 can control the order that tiles are rasterized in, we can use
it to implement overlapping blits using normal drawing and
GL_ARB_texture_barrier, as long as we can tell the kernel what order to
render the tiles in.

This commit introduces the core gallium support, vc4 changes will follow.

v2: Fix on the simulator.
v3: Add the cap (disabled) to other drivers, add rst docs for the cap.
v4: Rebase on PIPE_CAP_TGSI_ANY_REG_AS_ADDRESS
v5: Drop vc4 changes from this commit, for clarity.

Reviewed-by: Nicolai Hähnle <[email protected]> (v3)

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index b1010a6cd56..fe354b1c137 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -312,6 +312,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_MEMOBJ:
    case PIPE_CAP_LOAD_CONSTBUF:
    case PIPE_CAP_TGSI_ANY_REG_AS_ADDRESS:
+   case PIPE_CAP_TILE_RASTER_ORDER:
       return 0;
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
       return 4;