Relax nvrhi push constant limits to permit platform-specific runtime checks

[SRSaunders]

Expand platform push constant limits to 256 bytes on Windows and Linux, and 4096 bytes on macOS. Application can then determine and enforce application-specific and GPU-specific limits at runtime.

[asemarafa]

I encountered a build error in m1 mac, in vulkan-resource-bindings.cpp related to the hash_combine function. The error is as follows:

error: no matching function for call to 'hash_combine'
note: candidate function template not viable: no known conversion from 'uint64_t' (aka 'unsigned long long') to 'size_t &' (aka 'unsigned long &') for 1st argument

I've made some adjustments to resolve this issue

diff --git a/rtxmu b/rtxmu
index c27b13e..799a918 160000
--- a/rtxmu
+++ b/rtxmu
@@ -1 +1 @@
-Subproject commit c27b13ee5ff5966ac368df553f3b8b5d1272d855
+Subproject commit 799a918af94000d22828125d46aefd6ecd947e8d
diff --git a/src/vulkan/vulkan-resource-bindings.cpp b/src/vulkan/vulkan-resource-bindings.cpp
index 3b5b044..9af80b8 100644
--- a/src/vulkan/vulkan-resource-bindings.cpp
+++ b/src/vulkan/vulkan-resource-bindings.cpp
@@ -453,9 +453,11 @@ namespace nvrhi::vulkan
                 const auto range = binding.range.resolve(buffer->desc);
 
                 uint64_t viewInfoHash = 0;
-                nvrhi::hash_combine(viewInfoHash, range.byteOffset);
-                nvrhi::hash_combine(viewInfoHash, range.byteSize);
-                nvrhi::hash_combine(viewInfoHash, (uint64_t)vkformat);
+		size_t seed = static_cast<size_t>(viewInfoHash);
+		nvrhi::hash_combine(seed, range.byteOffset);
+		nvrhi::hash_combine(seed, range.byteSize);
+		nvrhi::hash_combine(seed, (uint64_t)vkformat);
+		viewInfoHash = static_cast<uint64_t>(seed);
 
                 const auto& bufferViewFound = buffer->viewCache.find(viewInfoHash);
                 auto& bufferViewRef = (bufferViewFound != buffer->viewCache.end()) ? bufferViewFound->second : buffer->viewCache[viewInfoHash];
@@ -772,9 +774,11 @@ namespace nvrhi::vulkan
 
                     const auto range = binding.range.resolve(buffer->desc);
                     uint64_t viewInfoHash = 0;
-                    nvrhi::hash_combine(viewInfoHash, range.byteOffset);
-                    nvrhi::hash_combine(viewInfoHash, range.byteSize);
-                    nvrhi::hash_combine(viewInfoHash, (uint64_t)vkformat);
+		    size_t seed = static_cast<size_t>(viewInfoHash);
+		    nvrhi::hash_combine(seed, range.byteOffset);
+		    nvrhi::hash_combine(seed, range.byteSize);
+		    nvrhi::hash_combine(seed, (uint64_t)vkformat);
+		    viewInfoHash = static_cast<uint64_t>(seed);
 
                     const auto& bufferViewFound = buffer->viewCache.find(viewInfoHash);
                     auto& bufferViewRef = (bufferViewFound != buffer->viewCache.end()) ? bufferViewFound->second : buffer->viewCache[viewInfoHash];
diff --git a/thirdparty/Vulkan-Headers b/thirdparty/Vulkan-Headers
index 00671c6..0193e15 160000
--- a/thirdparty/Vulkan-Headers
+++ b/thirdparty/Vulkan-Headers
@@ -1 +1 @@
-Subproject commit 00671c64ba5c488ade22ad572a0ef81d5e64c803
+Subproject commit 0193e158bc9f4d17e3c3a61c9311a0439ed5572d

Thanks!

[SRSaunders]

Sorry about that. If you are using Robert's nvrhi head branch I should have mentioned that you also need to apply #4. This solves the same problem. I hope you didn't spend too much time on it.

FYI - @RobertBeckebans has not yet merged these PRs since the release version of the game currently works off a detached head at commit 1cbc9e9. Perhaps he will update this soon to include improvements from Nvidia's upstream branch and these local changes.

[SRSaunders]

Rebased onto updated nvrhi main...