internal static bool OpenGLVertexAttribNormalized(RVertexElement element)
{
// TODO: This may or may not be the right behavor.
//
// For instance the VertexElementFormat.Byte4 format is not supposed
// to be normalized, but this line makes it so.
//
// The question is in MS XNA are types normalized based on usage or
// normalized based to their format?
//
if (element.VertexElementUsage == RVertexElementUsage.Color)
{
return(true);
}
switch (element.VertexElementFormat)
{
case RVertexElementFormat.NormalizedShort2:
case RVertexElementFormat.NormalizedShort4:
return(true);
default:
return(false);
}
}
static RVertexData2D()
{
RVertexElement[] elements = new RVertexElement[]
{
new RVertexElement(0, RVertexElementFormat.Vector2, RVertexElementUsage.Position),
new RVertexElement(8, RVertexElementFormat.Vector2, RVertexElementUsage.TextureCoordinate),
new RVertexElement(16, RVertexElementFormat.Vector4, RVertexElementUsage.Color)
};
RVertexDeclaration declaration = new RVertexDeclaration(elements);
VertexDeclaration = declaration;
}
static RVertexData()
{
RVertexElement[] elements = new RVertexElement[]
{
new RVertexElement(0, RVertexElementFormat.Vector3, RVertexElementUsage.Position),
new RVertexElement(sizeof(float) * (3 * 1), RVertexElementFormat.Vector3, RVertexElementUsage.Normal),
new RVertexElement(sizeof(float) * (3 * 2), RVertexElementFormat.Vector3, RVertexElementUsage.Bitangent),
new RVertexElement(sizeof(float) * (3 * 3), RVertexElementFormat.Vector3, RVertexElementUsage.Tangent),
new RVertexElement(sizeof(float) * (3 * 4), RVertexElementFormat.Vector2, RVertexElementUsage.TextureCoordinate)
};
RVertexDeclaration declaration = new RVertexDeclaration(elements);
VertexDeclaration = declaration;
}
private static int GetVertexStride(RVertexElement[] elements)
{
int max = 0;
for (var i = 0; i < elements.Length; i++)
{
var start = elements[i].Offset + RVertexElement.GetSize(elements[i].VertexElementFormat);
if (max < start)
{
max = start;
}
}
return(max);
}
internal void Apply(RShader shader, IntPtr offset)
{
RVertexDeclarationAttributeInfo attrInfo;
int shaderHash = shader.GetHashCode();
if (!shaderAttributeInfo.TryGetValue(shaderHash, out attrInfo))
{
// Get the vertex attribute info and cache it
attrInfo = new RVertexDeclarationAttributeInfo(16);
foreach (var ve in _elements)
{
var attributeLocation = shader.GetAttribLocation(ve.VertexElementUsage);
if (attributeLocation >= 0)
{
attrInfo.Elements.Add(new RVertexDeclarationAttributeInfo.Element()
{
Offset = ve.Offset,
AttributeLocation = attributeLocation,
NumberOfElements = RVertexElement.OpenGLNumberOfElements(ve.VertexElementFormat),
VertexAttribPointerType = RVertexElement.OpenGLVertexAttribPointerType(ve.VertexElementFormat),
Normalized = RVertexElement.OpenGLVertexAttribNormalized(ve),
});
attrInfo.EnabledAttributes[attributeLocation] = true;
}
}
shaderAttributeInfo.Add(shaderHash, attrInfo);
}
// Apply the vertex attribute info
foreach (var element in attrInfo.Elements)
{
GL.EnableVertexAttribArray(element.AttributeLocation);
REngine.CheckGLError();
GL.VertexAttribPointer(element.AttributeLocation,
element.NumberOfElements,
element.VertexAttribPointerType,
element.Normalized,
this.VertexStride,
(IntPtr)(offset.ToInt64() + element.Offset));
REngine.CheckGLError();
}
//GraphicsDevice.SetVertexAttributeArray(attrInfo.EnabledAttributes);
}
