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From Glenn Waldron, "Attached is a fix to State::convertVertexShaderSourceToOsgBuiltIns. The method was incorrectly inserting new declarations before a GLSL "#version" directive, which must always be the first line in a shader. This patch detects the #version directive and ensures that new declarations are inserted after it.

Browse Source 
Attached is the modified State.cpp file.

I have also attached a sample transcript, showing the new code working properly. I ran it against osgEarth's shaders and it works as expected.

"
This commit is contained in:
Robert Osfield 2011-01-11 17:04:37 +00:00
parent e4b1b6228d
commit 3cac9e9603
1 changed files with 35 additions and 21 deletions
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56
src/osg/State.cpp
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@ -1265,11 +1265,11 @@ namespace State_Utils
return replacedStr;
}
void replaceAndInsertDeclaration(std::string& source, const std::string& originalStr, const std::string& newStr, const std::string& declarationPrefix)
void replaceAndInsertDeclaration(std::string& source, std::string::size_type declPos, const std::string& originalStr, const std::string& newStr, const std::string& declarationPrefix)
{
if (replace(source, originalStr, newStr))
{
source.insert(0, declarationPrefix + newStr + std::string(";\n"));
source.insert(declPos, declarationPrefix + newStr + std::string(";\n"));
}
}
}
@ -1279,32 +1279,46 @@ bool State::convertVertexShaderSourceToOsgBuiltIns(std::string& source) const
OSG_NOTICE<<"State::convertShaderSourceToOsgBuiltIns()"<<std::endl;
OSG_NOTICE<<"++Before Converted source "<<std::endl<<source<<std::endl<<"++++++++"<<std::endl;
// replace ftransform as it only works with built-ins
State_Utils::replace(source, "ftransform()", "gl_ModelViewProjectionMatrix * gl_Vertex");
State_Utils::replaceAndInsertDeclaration(source, "gl_Normal", "osg_Normal", "attribute vec3 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_Vertex", "osg_Vertex", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_Color", "osg_Color", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_SecondaryColor", "osg_SecondaryColor", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_FogCoord", "osg_FogCoord", "attribute float ");
// find the first legal insertion point for replacement declarations. GLSL requires that nothing
// precede a "#verson" compiler directive, so we must insert new declarations after it.
std::string::size_type declPos = source.rfind( "#version " );
if ( declPos != std::string::npos )
{
// found the string, now find the next linefeed and set the insertion point after it.
declPos = source.find( '\n', declPos );
declPos = declPos != std::string::npos ? declPos+1 : source.length();
}
else
{
declPos = 0;
}
State_Utils::replaceAndInsertDeclaration(source, "gl_MultiTexCoord0", "osg_MultiTexCoord0", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_MultiTexCoord1", "osg_MultiTexCoord1", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_MultiTexCoord2", "osg_MultiTexCoord2", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_MultiTexCoord3", "osg_MultiTexCoord3", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_MultiTexCoord4", "osg_MultiTexCoord4", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_MultiTexCoord5", "osg_MultiTexCoord5", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_MultiTexCoord6", "osg_MultiTexCoord6", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_MultiTexCoord7", "osg_MultiTexCoord7", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_Normal", "osg_Normal", "attribute vec3 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_Vertex", "osg_Vertex", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_Color", "osg_Color", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_SecondaryColor", "osg_SecondaryColor", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_FogCoord", "osg_FogCoord", "attribute float ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_MultiTexCoord0", "osg_MultiTexCoord0", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_MultiTexCoord1", "osg_MultiTexCoord1", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_MultiTexCoord2", "osg_MultiTexCoord2", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_MultiTexCoord3", "osg_MultiTexCoord3", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_MultiTexCoord4", "osg_MultiTexCoord4", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_MultiTexCoord5", "osg_MultiTexCoord5", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_MultiTexCoord6", "osg_MultiTexCoord6", "attribute vec4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_MultiTexCoord7", "osg_MultiTexCoord7", "attribute vec4 ");
// replace built in uniform
State_Utils::replaceAndInsertDeclaration(source, "gl_ModelViewMatrix", "osg_ModelViewMatrix", "uniform mat4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_ModelViewProjectionMatrix", "osg_ModelViewProjectionMatrix", "uniform mat4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_ProjectionMatrix", "osg_ProjectionMatrix", "uniform mat4 ");
State_Utils::replaceAndInsertDeclaration(source, "gl_NormalMatrix", "osg_NormalMatrix", "uniform mat3 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_ModelViewMatrix", "osg_ModelViewMatrix", "uniform mat4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_ModelViewProjectionMatrix", "osg_ModelViewProjectionMatrix", "uniform mat4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_ProjectionMatrix", "osg_ProjectionMatrix", "uniform mat4 ");
State_Utils::replaceAndInsertDeclaration(source, declPos, "gl_NormalMatrix", "osg_NormalMatrix", "uniform mat3 ");
OSG_NOTICE<<"-------- Converted source "<<std::endl<<source<<std::endl<<"----------------"<<std::endl;
OSG_NOTICE<<"-------- Converted source "<<std::endl<<source<<std::endl<<"----------------"<<std::endl;
return true;
}