From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 10 Apr 2021 20:07:19 +0000 (+0300)
Subject: Use a vector for storage in DefaultUniformBlock
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=3af09f06e9f69532e5adfe6bcd9a7b2d1aea6d5b

Use a vector for storage in DefaultUniformBlock

Uniform locations are normally spaced no more than 4 apart, so even with
a few empty spots a vector is going to be more efficient than a map.
---

diff --git a/source/core/uniformblock.cpp b/source/core/uniformblock.cpp
index 25511d25..f114ea58 100644
--- a/source/core/uniformblock.cpp
+++ b/source/core/uniformblock.cpp
@@ -24,11 +24,16 @@ void DefaultUniformBlock::attach(const Program::UniformInfo &info, const Uniform
 	if(info.block->bind_point>=0)
 		throw invalid_argument("DefaultUniformBlock::attach");
 
-	uniforms[info.location] = &uni;
+	attach(info.location, uni);
 }
 
 void DefaultUniformBlock::attach(int index, const Uniform &uni)
 {
+	if(index<0)
+		return;
+
+	if(static_cast<unsigned>(index)>=uniforms.size())
+		uniforms.resize(index+1, 0);
 	uniforms[index] = &uni;
 }
 
@@ -37,8 +42,9 @@ void DefaultUniformBlock::apply(int index) const
 	if(index>=0)
 		throw invalid_argument("DefaultUniformBlock::apply");
 
-	for(map<int, const Uniform *>::const_iterator i=uniforms.begin(); i!=uniforms.end(); ++i)
-		i->second->apply(i->first);
+	for(unsigned i=0; i<uniforms.size(); ++i)
+		if(uniforms[i])
+			uniforms[i]->apply(i);
 }
 
 
diff --git a/source/core/uniformblock.h b/source/core/uniformblock.h
index 5a037edb..bc0b933b 100644
--- a/source/core/uniformblock.h
+++ b/source/core/uniformblock.h
@@ -35,7 +35,7 @@ with locations, as returned by Program::get_uniform_location. */
 class DefaultUniformBlock: public UniformBlock
 {
 private:
-	std::map<int, const Uniform *> uniforms;
+	std::vector<const Uniform *> uniforms;
 
 public:
 	DefaultUniformBlock();