Mesa (main): zink: add a function for getting the minimum framebuffer layers
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Thu Jun 16 00:19:06 UTC 2022
Module: Mesa
Branch: main
Commit: f74df6205d245491a8a54ffa6e737f22b9b00fb4
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=f74df6205d245491a8a54ffa6e737f22b9b00fb4
Author: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Date: Wed Jun 15 12:58:03 2022 -0400
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 at redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17061>
---
src/gallium/drivers/zink/zink_framebuffer.c | 23 +++++++++++++++++++++++
src/gallium/drivers/zink/zink_framebuffer.h | 2 ++
2 files changed, 25 insertions(+)
diff --git a/src/gallium/drivers/zink/zink_framebuffer.c b/src/gallium/drivers/zink/zink_framebuffer.c
index 84f410d60f7..e0bc32d1aaa 100644
--- a/src/gallium/drivers/zink/zink_framebuffer.c
+++ b/src/gallium/drivers/zink/zink_framebuffer.c
@@ -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);
+}
diff --git a/src/gallium/drivers/zink/zink_framebuffer.h b/src/gallium/drivers/zink/zink_framebuffer.h
index 7544074e89b..e129183bf25 100644
--- a/src/gallium/drivers/zink/zink_framebuffer.h
+++ b/src/gallium/drivers/zink/zink_framebuffer.h
@@ -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
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