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gallium: Add a u_default_clear_buffer helper

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[Alyssa: Add a default CPU implementation of pipe->clear_buffer(). This hook is
mandatory for OpenCL support. Even though this implementation isn't optimal by
any means, having a conformant default available in core will lower the barrier
of entry to OpenCL support.]

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16044>
This commit is contained in:
Jason Ekstrand 2022-04-14 11:41:41 -05:00 • committed by Marge Bot
parent 9b11618dfa
commit cd21d32fe4
2 changed files with 38 additions and 0 deletions
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32
src/gallium/auxiliary/util/u_transfer.c
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@ -39,6 +39,38 @@ void u_default_buffer_subdata(struct pipe_context *pipe,
pipe_buffer_unmap(pipe, transfer);
}
void u_default_clear_buffer(struct pipe_context *pipe,
struct pipe_resource *resource,
unsigned offset, unsigned size,
const void *clear_value,
int clear_value_size)
{
struct pipe_transfer *transfer = NULL;
struct pipe_box box;
uint8_t *map = NULL;
/* the write flag is implicit by the nature of buffer_subdata */
unsigned usage = PIPE_MAP_WRITE;
/* clear_buffer implicitly discards the rewritten buffer range. */
if (offset == 0 && size == resource->width0) {
usage |= PIPE_MAP_DISCARD_WHOLE_RESOURCE;
} else {
usage |= PIPE_MAP_DISCARD_RANGE;
}
u_box_1d(offset, size, &box);
map = pipe->buffer_map(pipe, resource, 0, usage, &box, &transfer);
if (!map)
return;
assert(clear_value_size > 0);
for (unsigned off = 0; off < size; off += clear_value_size)
memcpy(map + off, clear_value, MIN2(clear_value_size, size - off));
pipe_buffer_unmap(pipe, transfer);
}
void u_default_texture_subdata(struct pipe_context *pipe,
struct pipe_resource *resource,
unsigned level,

6
src/gallium/auxiliary/util/u_transfer.h
View file

@ -16,6 +16,12 @@ void u_default_buffer_subdata(struct pipe_context *pipe,
unsigned usage, unsigned offset,
unsigned size, const void *data);
void u_default_clear_buffer(struct pipe_context *pipe,
struct pipe_resource *resource,
unsigned offset, unsigned size,
const void *clear_value,
int clear_value_size);
void u_default_texture_subdata(struct pipe_context *pipe,
struct pipe_resource *resource,
unsigned level,