From cb4158902a680c58c5834da8577cd95ff753fd7c Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 17 Nov 2021 14:45:15 +0200
Subject: [PATCH] Update usage of hash functions

Calculating hashes directly from the binary values is faster than first
creating a string.
---
 source/core/reflectdata.cpp   | 18 ++++++++++++------
 source/core/tag.cpp           |  4 ++--
 source/glsl/finalize.cpp      |  2 +-
 source/glsl/generate.cpp      |  2 +-
 source/materials/material.cpp |  9 ++++++---
 5 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/source/core/reflectdata.cpp b/source/core/reflectdata.cpp
index db679873..8ecb9abe 100644
--- a/source/core/reflectdata.cpp
+++ b/source/core/reflectdata.cpp
@@ -10,10 +10,12 @@ namespace GL {
 
 void ReflectData::update_layout_hash()
 {
-	string layout_descriptor;
+	layout_hash = hash<32>(uniform_blocks.size());
 	for(const UniformBlockInfo &b: uniform_blocks)
-		layout_descriptor += format("%d:%x\n", b.bind_point, b.layout_hash);
-	layout_hash = hash32(layout_descriptor);
+	{
+		layout_hash = hash_update<32>(layout_hash, b.bind_point);
+		layout_hash = hash_update<32>(layout_hash, b.layout_hash);
+	}
 }
 
 
@@ -24,10 +26,14 @@ void ReflectData::UniformBlockInfo::sort_uniforms()
 
 void ReflectData::UniformBlockInfo::update_layout_hash()
 {
-	string layout_descriptor;
+	layout_hash = hash<32>(uniforms.size());
 	for(const UniformInfo *u: uniforms)
-		layout_descriptor += format("%d:%s:%x:%d\n", u->location, u->name, u->type, u->array_size);
-	layout_hash = hash32(layout_descriptor);
+	{
+		layout_hash = hash_update<32>(layout_hash, u->location);
+		layout_hash = hash_update<32>(layout_hash, u->name);
+		layout_hash = hash_update<32>(layout_hash, u->type);
+		layout_hash = hash_update<32>(layout_hash, u->array_size);
+	}
 }
 
 } // namespace GL
diff --git a/source/core/tag.cpp b/source/core/tag.cpp
index 56236c19..84eb074a 100644
--- a/source/core/tag.cpp
+++ b/source/core/tag.cpp
@@ -22,7 +22,7 @@ namespace Msp {
 namespace GL {
 
 Tag::Tag(const char *s):
-	id((s && *s) ? hash32(s, strlen(s)) : 0)
+	id((s && *s) ? hash<32>(s, strlen(s)) : 0)
 {
 #ifdef DEBUG
 	if(s)
@@ -31,7 +31,7 @@ Tag::Tag(const char *s):
 }
 
 Tag::Tag(const string &s):
-	id(s.empty() ? 0 : hash32(s))
+	id(s.empty() ? 0 : hash<32>(s))
 {
 #ifdef DEBUG
 	if(!s.empty())
diff --git a/source/glsl/finalize.cpp b/source/glsl/finalize.cpp
index 60312be8..52cf9580 100644
--- a/source/glsl/finalize.cpp
+++ b/source/glsl/finalize.cpp
@@ -156,7 +156,7 @@ void LocationAllocator::bind_uniform(RefPtr<Layout> &layout, const string &name,
 	{
 		set<unsigned> &used = used_bindings[desc_set];
 
-		unsigned bind_point = fold32(hash64(name))%range;
+		unsigned bind_point = hash_fold<32>(hash<64>(name))%range;
 		while(used.count(bind_point))
 			bind_point = (bind_point+1)%range;
 
diff --git a/source/glsl/generate.cpp b/source/glsl/generate.cpp
index c82d1c6c..85c3009b 100644
--- a/source/glsl/generate.cpp
+++ b/source/glsl/generate.cpp
@@ -22,7 +22,7 @@ void ConstantIdAssigner::apply(Module &module, const Features &features)
 			id = j->second;
 		else
 		{
-			id = hash32(v->name)%features.constant_id_range;
+			id = hash<32>(v->name)%features.constant_id_range;
 			while(used_ids.count(id))
 				id = (id+1)%features.constant_id_range;
 		}
diff --git a/source/materials/material.cpp b/source/materials/material.cpp
index 6d9c0571..a34c0457 100644
--- a/source/materials/material.cpp
+++ b/source/materials/material.cpp
@@ -20,12 +20,15 @@ const Program *Material::create_compatible_shader(const map<string, int> &extra_
 	for(const auto &kvp: extra_spec)
 		spec_values[kvp.first] = kvp.second;
 
-	string info = module_name;
+	uint64_t info_hash = hash<64>(module_name);
 	for(const auto &kvp: spec_values)
-		info += format(",%s:%d", kvp.first, kvp.second);
+	{
+		info_hash = hash_update<64>(info_hash, kvp.first);
+		info_hash = hash_update<64>(info_hash, kvp.second);
+	}
 
 	Resources &res = Resources::get_global();
-	string name = format("_material_%016x.shader", hash64(info));
+	string name = format("_material_%016x.shader", info_hash);
 	Program *shprog = res.find<Program>(name);
 	if(shprog)
 		return shprog;
-- 
2.45.2