public virtual int GetAttributeIndex(VertexElementSemantic semantic, int index)
{
int res = this.customAttribues[(int)semantic - 1, index];
if (res == NullCustomAttributesIndex)
{
string attString = this.GetAttributeSemanticString(semantic);
int attrib = GL.GetAttribLocation(this.glProgramHandle, attString);
GLES2Config.GlCheckError(this);
//sadly position is a special case
if (attrib == NotFoundCustomAttributesIndex && semantic == VertexElementSemantic.Position)
{
attrib = GL.GetAttribLocation(this.glProgramHandle, "position");
GLES2Config.GlCheckError(this);
}
//for uv and other case the index is a part of the name
if (attrib == NotFoundCustomAttributesIndex)
{
string attStringWithSemantic = attString + index.ToString();
attrib = GL.GetAttribLocation(this.glProgramHandle, attStringWithSemantic);
GLES2Config.GlCheckError(this);
}
//update customAttributes with the index we found (or didnt' find)
this.customAttribues[(int)semantic - 1, index] = attrib;
res = attrib;
}
return(res);
}
public override int GetAttributeIndex(Graphics.VertexElementSemantic semantic, int index)
{
int res = customAttribues[(int)semantic - 1, index];
if (res == NullCustomAttributesIndex)
{
int handle = vertexProgram.GLSLProgram.GLProgramHandle;
string attString = GetAttributeSemanticString(semantic);
int attrib = GL.GetAttribLocation(handle, attString);
GLES2Config.GlCheckError(this);
if (attrib == NotFoundCustomAttributesIndex && semantic == VertexElementSemantic.Position)
{
attrib = GL.GetAttribLocation(handle, "position");
GLES2Config.GlCheckError(this);
}
if (attrib == NotFoundCustomAttributesIndex)
{
string attStringWithSemantic = attString + index.ToString();
attrib = GL.GetAttribLocation(handle, attStringWithSemantic);
GLES2Config.GlCheckError(this);
}
customAttribues[(int)semantic - 1, index] = attrib;
res = attrib;
}
return(res);
}
