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zink: add a function for getting the minimum framebuffer layers 

this clamps the layer count to the smallest number of layers rather
than the largest

cc: mesa-stable

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17061>
This commit is contained in:
Mike Blumenkrantz 2022-06-15 12:58:03 -04:00 committed by Marge Bot
parent 979f213110
commit f74df6205d
2 changed files with 25 additions and 0 deletions
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23
src/gallium/drivers/zink/zink_framebuffer.c
View File

@ -219,3 +219,26 @@ zink_update_framebuffer_state(struct zink_context *ctx)
ctx->fb_changed |= ctx->framebuffer != fb;
ctx->framebuffer = fb;
}
/* same as u_framebuffer_get_num_layers, but clamp to lowest layer count */
unsigned
zink_framebuffer_get_num_layers(const struct pipe_framebuffer_state *fb)
{
unsigned i, num_layers = UINT32_MAX;
if (!(fb->nr_cbufs || fb->zsbuf))
return MAX2(fb->layers, 1);
for (i = 0; i < fb->nr_cbufs; i++) {
if (fb->cbufs[i]) {
unsigned num = fb->cbufs[i]->u.tex.last_layer -
fb->cbufs[i]->u.tex.first_layer + 1;
num_layers = MIN2(num_layers, num);
}
}
if (fb->zsbuf) {
unsigned num = fb->zsbuf->u.tex.last_layer -
fb->zsbuf->u.tex.first_layer + 1;
num_layers = MIN2(num_layers, num);
}
return MAX2(num_layers, 1);
}

2
src/gallium/drivers/zink/zink_framebuffer.h
View File

@ -87,4 +87,6 @@ zink_get_framebuffer(struct zink_context *ctx);
void
zink_update_framebuffer_state(struct zink_context *ctx);
unsigned
zink_framebuffer_get_num_layers(const struct pipe_framebuffer_state *fb);
#endif