On Tue, Nov 3, 2015 at 6:47 PM, Marek Olšák <mar...@gmail.com> wrote:
> From: Marek Olšák <marek.ol...@amd.com>
>
> ---
> src/gallium/drivers/radeonsi/si_blit.c | 55
> ++++++++++++++++++++++++++++++++++
> 1 file changed, 55 insertions(+)
>
> diff --git a/src/gallium/drivers/radeonsi/si_blit.c
> b/src/gallium/drivers/radeonsi/si_blit.c
> index fce014a..e934146 100644
> --- a/src/gallium/drivers/radeonsi/si_blit.c
> +++ b/src/gallium/drivers/radeonsi/si_blit.c
> @@ -731,9 +731,64 @@ static void si_flush_resource(struct pipe_context *ctx,
> }
> }
>
> +static void si_pipe_clear_buffer(struct pipe_context *ctx,
> + struct pipe_resource *dst,
> + unsigned offset, unsigned size,
> + const void *clear_value,
> + int clear_value_size)
> +{
> + struct si_context *sctx = (struct si_context*)ctx;
> + const uint32_t *u32 = clear_value;
> + unsigned i;
> + bool clear_value_fits_dword = true;
> + uint8_t *map;
> +
> + if (clear_value_size > 4)
> + for (i = 1; i < clear_value_size / 4; i++)
> + if (u32[0] != u32[i]) {
> + clear_value_fits_dword = false;
> + break;
> + }
> +
> + /* Use CP DMA for the simple case. */
> + if (offset % 4 == 0 && size % 4 == 0 && clear_value_fits_dword) {
> + uint32_t value = u32[0];
> +
> + switch (clear_value_size) {
> + case 1:
> + value &= 0xff;
> + value |= (value << 8) | (value << 16) | (value << 24);
> + break;
> + case 2:
> + value &= 0xffff;
> + value |= value << 16;
> + break;
> + }
> +
> + sctx->b.clear_buffer(ctx, dst, offset, size, value, false);
> + return;
> + }
> +
> + /* TODO: use a compute shader for other cases. */
What about using SDMA? It supports byte aligned constant fills at
least on CIK+.
Alex
> +
> + /* Software fallback. */
> + map = r600_buffer_map_sync_with_rings(&sctx->b, r600_resource(dst),
> + PIPE_TRANSFER_WRITE);
> + if (!map)
> + return;
> +
> + map += offset;
> + size /= clear_value_size;
> + for (i = 0; i < size; i++) {
> + memcpy(map, clear_value, clear_value_size);
> + map += clear_value_size;
> + }
> +}
> +
> void si_init_blit_functions(struct si_context *sctx)
> {
> sctx->b.b.clear = si_clear;
> + sctx->b.b.clear_buffer = si_pipe_clear_buffer;
> sctx->b.b.clear_render_target = si_clear_render_target;
> sctx->b.b.clear_depth_stencil = si_clear_depth_stencil;
> sctx->b.b.resource_copy_region = si_resource_copy_region;
> --
> 2.1.4
>
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