static struct pipe_resource *
buf_create(struct pipe_screen *screen, const struct pipe_resource *templ)
{
struct ilo_buffer *buf;
buf = CALLOC_STRUCT(ilo_buffer);
if (!buf)
return NULL;
buf->base = *templ;
buf->base.screen = screen;
pipe_reference_init(&buf->base.reference, 1);
buf->bo_size = templ->width0;
buf->bo_flags = 0;
/*
* From the Sandy Bridge PRM, volume 1 part 1, page 118:
*
* "For buffers, which have no inherent "height," padding requirements
* are different. A buffer must be padded to the next multiple of 256
* array elements, with an additional 16 bytes added beyond that to
* account for the L1 cache line."
*/
if (templ->bind & PIPE_BIND_SAMPLER_VIEW)
buf->bo_size = align(buf->bo_size, 256) + 16;
if (!buf_create_bo(buf)) {
FREE(buf);
return NULL;
}
return &buf->base;
}
static struct pipe_resource *
buf_create(struct pipe_screen *screen, const struct pipe_resource *templ)
{
const struct ilo_screen *is = ilo_screen(screen);
struct ilo_buffer *buf;
buf = CALLOC_STRUCT(ilo_buffer);
if (!buf)
return NULL;
buf->base = *templ;
buf->base.screen = screen;
pipe_reference_init(&buf->base.reference, 1);
buf->bo_size = templ->width0;
/*
* From the Sandy Bridge PRM, volume 1 part 1, page 118:
*
* "For buffers, which have no inherent "height," padding requirements
* are different. A buffer must be padded to the next multiple of 256
* array elements, with an additional 16 bytes added beyond that to
* account for the L1 cache line."
*/
if (templ->bind & PIPE_BIND_SAMPLER_VIEW)
buf->bo_size = align(buf->bo_size, 256) + 16;
if ((templ->bind & PIPE_BIND_VERTEX_BUFFER) &&
ilo_dev_gen(&is->dev) < ILO_GEN(7.5)) {
/*
* As noted in ilo_translate_format(), we treat some 3-component formats
* as 4-component formats to work around hardware limitations. Imagine
* the case where the vertex buffer holds a single
* PIPE_FORMAT_R16G16B16_FLOAT vertex, and buf->bo_size is 6. The
* hardware would fail to fetch it at boundary check because the vertex
* buffer is expected to hold a PIPE_FORMAT_R16G16B16A16_FLOAT vertex
* and that takes at least 8 bytes.
*
* For the workaround to work, we should add 2 to the bo size. But that
* would waste a page when the bo size is already page aligned. Let's
* round it to page size for now and revisit this when needed.
*/
buf->bo_size = align(buf->bo_size, 4096);
}
if (buf->bo_size < templ->width0 ||
buf->bo_size > ilo_max_resource_size ||
!buf_create_bo(buf)) {
FREE(buf);
return NULL;
}
return &buf->base;
}
bool
ilo_buffer_rename_bo(struct ilo_buffer *buf)
{
struct intel_bo *old_bo = buf->bo;
if (buf_create_bo(buf)) {
intel_bo_unreference(old_bo);
return true;
}
else {
buf->bo = old_bo;
return false;
}
}
bool
ilo_buffer_alloc_bo(struct ilo_buffer *buf)
{
return buf_create_bo(buf);
}
