From ebe5a5579cd61e759b523a38a2717eac9b562f83 Mon Sep 17 00:00:00 2001
From: Tim Moore <timoore@redhat.com>
Date: Fri, 20 Nov 2009 22:58:59 +0100
Subject: [PATCH] shader language predicate
---
simgear/scene/material/Technique.cxx | 33 ++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/simgear/scene/material/Technique.cxx b/simgear/scene/material/Technique.cxx
index 4258b464..b8093f35 100644
--- a/simgear/scene/material/Technique.cxx
+++ b/simgear/scene/material/Technique.cxx
@@ -13,6 +13,7 @@
#include <string>
#include <osg/GLExtensions>
+#include <osg/GL2Extensions>
#include <osg/Math>
#include <osgUtil/CullVisitor>
@@ -274,6 +275,38 @@ Expression* extensionSupportedParser(const SGPropertyNode* exp,
expression::ExpParserRegistrar
extensionSupportedRegistrar("extension-supported", extensionSupportedParser);
+class GLShaderLanguageExpression : public GeneralNaryExpression<float, int>
+{
+public:
+ void eval(float& value, const expression::Binding* b) const
+ {
+ value = 0.0f;
+ int contextId = getOperand(0)->getValue(b);
+ GL2Extensions* extensions
+ = GL2Extensions::Get(static_cast<unsigned>(contextId), true);
+ if (!extensions)
+ return;
+ if (!extensions->isGlslSupported())
+ return;
+ value = extensions->getLanguageVersion();
+ }
+};
+
+Expression* shaderLanguageParser(const SGPropertyNode* exp,
+ expression::Parser* parser)
+{
+ GLShaderLanguageExpression* slexp = new GLShaderLanguageExpression;
+ int location = parser->getBindingLayout().addBinding("__contextId",
+ expression::INT);
+ VariableExpression<int>* contextExp = new VariableExpression<int>(location);
+ slexp->addOperand(contextExp);
+ return slexp;
+}
+
+expression::ExpParserRegistrar shaderLanguageRegistrar("shader-language",
+ glVersionParser);
+
+
void Technique::setGLExtensionsPred(float glVersion,
const std::vector<std::string>& extensions)
{
--
2.39.5