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gallium/util: Introduce a helper for finding whole-resource blits. 

This can be useful for tilers to discard previous rendering to a buffer
instead of reloading before drawing all the pixels.

Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11455>
This commit is contained in:
Emma Anholt 2021-06-17 09:33:24 -07:00 committed by Marge Bot
parent 9ce44dc9bc
commit 447b6f60a6
1 changed files with 47 additions and 0 deletions
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47
src/gallium/auxiliary/util/u_inlines.h
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@ -34,6 +34,7 @@
#include "pipe/p_state.h"
#include "pipe/p_screen.h"
#include "util/compiler.h"
#include "util/format/u_format.h"
#include "util/u_debug.h"
#include "util/u_debug_describe.h"
#include "util/u_debug_refcnt.h"
@ -781,6 +782,52 @@ util_texrange_covers_whole_level(const struct pipe_resource *tex,
depth == util_num_layers(tex, level);
}
/**
* Returns true if the blit will fully initialize all pixels in the resource.
*/
static inline bool
util_blit_covers_whole_resource(const struct pipe_blit_info *info)
{
/* No conditional rendering or scissoring. (We assume that the caller would
* have dropped any redundant scissoring)
*/
if (info->scissor_enable || info->window_rectangle_include || info->render_condition_enable || info->alpha_blend)
return false;
const struct pipe_resource *dst = info->dst.resource;
/* A single blit can't initialize a miptree. */
if (dst->last_level != 0)
return false;
assert(info->dst.level == 0);
/* Make sure the dst box covers the whole resource. */
if (!(util_texrange_covers_whole_level(dst, 0,
0, 0, 0,
info->dst.box.width, info->dst.box.height, info->dst.box.depth))) {
return false;
}
/* Make sure the mask actually updates all the channels present in the dst format. */
if (info->mask & PIPE_MASK_RGBA) {
if ((info->mask & PIPE_MASK_RGBA) != PIPE_MASK_RGBA)
return false;
}
if (info->mask & PIPE_MASK_ZS) {
const struct util_format_description *format_desc = util_format_description(info->dst.format);
uint32_t dst_has = 0;
if (util_format_has_depth(format_desc))
dst_has |= PIPE_MASK_Z;
if (util_format_has_stencil(format_desc))
dst_has |= PIPE_MASK_S;
if (dst_has & ~(info->mask & PIPE_MASK_ZS))
return false;
}
return true;
}
static inline bool
util_logicop_reads_dest(enum pipe_logicop op)
{