protected override void PopulateParameterNames( GpuProgramParameters parms )
{
Debug.Assert( cgProgram != IntPtr.Zero );
// Note use of 'leaf' format so we only get bottom-level params, not structs
IntPtr param = Cg.cgGetFirstLeafParameter( cgProgram, Cg.CG_PROGRAM );
int index = 0;
// loop through the rest of the params
while ( param != IntPtr.Zero )
{
// get the type of this param up front
int paramType = Cg.cgGetParameterType( param );
// Look for uniform parameters only
// Don't bother enumerating unused parameters, especially since they will
// be optimized out and therefore not in the indexed versions
if ( Cg.cgIsParameterReferenced( param ) != 0
&& Cg.cgGetParameterVariability( param ) == Cg.CG_UNIFORM
&& Cg.cgGetParameterDirection( param ) != Cg.CG_OUT
&& paramType != Cg.CG_SAMPLER1D
&& paramType != Cg.CG_SAMPLER2D
&& paramType != Cg.CG_SAMPLER3D
&& paramType != Cg.CG_SAMPLERCUBE
&& paramType != Cg.CG_SAMPLERRECT )
{
// get the name and index of the program param
string name = Cg.cgGetParameterName( param );
// fp30 uses named rather than indexed params, so Cg returns
// 0 for the index. However, we need the index to be unique here
// Resource type 3256 doesn't have a define in the Cg header, so I assume
// it means an unused or non-indexed params, since it is also returned
// for programs that have a param that is not referenced in the program
// and ends up getting pruned by the Cg compiler
if ( selectedCgProfile == Cg.CG_PROFILE_FP30 )
{
// use a fake index just to order the named fp30 params
index++;
}
else
{
// get the param constant index the normal way
index = Cg.cgGetParameterResourceIndex( param );
}
// get the underlying resource type of this param
// we need a special case for the register combiner
// stage constants.
int resource = Cg.cgGetParameterResource( param );
// Get the parameter resource, so we know what type we're dealing with
switch ( resource )
{
case Cg.CG_COMBINER_STAGE_CONST0:
// register combiner, const 0
// the index relates to the texture stage; store this as (stage * 2) + 0
index = index * 2;
break;
case Cg.CG_COMBINER_STAGE_CONST1:
// register combiner, const 1
// the index relates to the texture stage; store this as (stage * 2) + 1
index = ( index * 2 ) + 1;
break;
}
// map the param to the index
parms.MapParamNameToIndex( name, index );
}
// get the next param
param = Cg.cgGetNextLeafParameter( param );
}
}
