vo_gpu: add namespace query mechanism

Backported from @haasn's change to libplacebo. More flexible than the
previous "shared || non-shared" distinction. The extra flexibility is
needed for Direct3D 11, but it also doesn't hurt code-wise.

1 files changed, 8 insertions, 4 deletions

diff --git a/video/out/gpu/ra.h b/video/out/gpu/ra.h
index 15fa782bdd..5c5c851e64 100644
--- a/video/out/gpu/ra.h
+++ b/video/out/gpu/ra.h
@@ -50,8 +50,7 @@ enum {
     RA_CAP_BUF_RO         = 1 << 5, // supports RA_VARTYPE_BUF_RO
     RA_CAP_BUF_RW         = 1 << 6, // supports RA_VARTYPE_BUF_RW
     RA_CAP_NESTED_ARRAY   = 1 << 7, // supports nested arrays
-    RA_CAP_SHARED_BINDING = 1 << 8, // sampler/image/buffer namespaces are disjoint
-    RA_CAP_GLOBAL_UNIFORM = 1 << 9, // supports using "naked" uniforms (not UBO)
+    RA_CAP_GLOBAL_UNIFORM = 1 << 8, // supports using "naked" uniforms (not UBO)
 };
 
 enum ra_ctype {
@@ -206,8 +205,8 @@ struct ra_renderpass_input {
     // RA_VARTYPE_IMG_W: image unit
     // RA_VARTYPE_BUF_* buffer binding point
     // Other uniforms: unused
-    // If RA_CAP_SHARED_BINDING is set, these may only be unique per input type.
-    // Otherwise, these must be unique for all input values.
+    // Bindings must be unique within each namespace, as specified by
+    // desc_namespace()
     int binding;
 };
 
@@ -396,6 +395,11 @@ struct ra_fns {
     // but must be implemented if ra.max_pushc_size > 0.
     struct ra_layout (*push_constant_layout)(struct ra_renderpass_input *inp);
 
+    // Returns an abstract namespace index for a given renderpass input type.
+    // This will always be a value >= 0 and < RA_VARTYPE_COUNT. This is used to
+    // figure out which inputs may share the same value of `binding`.
+    int (*desc_namespace)(enum ra_vartype type);
+
     // Clear the dst with the given color (rgba) and within the given scissor.
     // dst must have dst->params.render_dst==true. Content outside of the
     // scissor is preserved.