[Bf-blender-cvs] [bb3e669d06e] blender2.8: Gawain: faster lookup shader attribs by name

[Mike Erwin]

Commit: bb3e669d06ec5aead740affe75ac0375110b4d7a
Author: Mike Erwin
Date:   Sun Jun 4 22:02:30 2017 -0400
Branches: blender2.8
https://developer.blender.org/rBbb3e669d06ec5aead740affe75ac0375110b4d7a

Gawain: faster lookup shader attribs by name

Quick hash rejection instead of string comparison. Uniform lookups already work this way. I don't expect a major overall speedup since attributes are looked up less frequently than uniforms.

===================================================================

M	intern/gawain/src/shader_interface.c

===================================================================

diff --git a/intern/gawain/src/shader_interface.c b/intern/gawain/src/shader_interface.c
index f0da342f088..4c9f7fae67f 100644
--- a/intern/gawain/src/shader_interface.c
+++ b/intern/gawain/src/shader_interface.c
@@ -288,6 +288,7 @@ const ShaderInput* ShaderInterface_attrib(const ShaderInterface* shaderface, con
 	{
 	// attribs are stored after uniforms
 	const uint32_t input_ct = shaderface->uniform_ct + shaderface->attrib_ct;
+	const unsigned name_hash = hash_string(name);
 	for (uint32_t i = shaderface->uniform_ct; i < input_ct; ++i)
 		{
 		const ShaderInput* attrib = shaderface->inputs + i;
@@ -296,6 +297,8 @@ const ShaderInput* ShaderInterface_attrib(const ShaderInterface* shaderface, con
 		if (attrib->name == NULL) continue;
 #endif
 
+		if (attrib->name_hash != name_hash) continue;
+
 		if (match(attrib->name, name))
 			return attrib;
 		}