/// <summary>
/// Enable the generic vertex attribute.
/// </summary>
/// <param name="ctx">
/// The <see cref="GraphicsContext"/> on which the shader program is bound.
/// </param>
/// <param name="attributeBinding">
/// The <see cref="ShaderProgram.AttributeBinding"/> representing the generic vertex attribute.
/// </param>
internal virtual void EnableVertexAttribute(GraphicsContext ctx, uint location, ShaderAttributeType type)
{
ArrayBufferObjectBase.IArraySection arraySection = ArrayBuffer.GetArraySection(ArraySectionIndex);
int arrayBaseType = (int)arraySection.ItemType.GetVertexBaseType();
int arrayLength = (int)arraySection.ItemType.GetArrayLength();
int arrayStride = arraySection.Stride.ToInt32();
// Avoid rendundant buffer binding and relative vertex array setup
if (ctx.Extensions.VertexArrayObject_ARB && IsDirty == false)
{
// CheckVertexAttribute(ctx, location);
return;
}
// Bind the array buffer
ctx.Bind(ArrayBuffer);
// Bind varying attribute to currently bound buffer object
switch (ArrayBufferItem.GetArrayBaseType(type))
{
case VertexBaseType.Float:
Gl.VertexAttribPointer(
location,
arrayLength, arrayBaseType, arraySection.Normalized,
arrayStride, arraySection.Offset
);
break;
case VertexBaseType.Int:
case VertexBaseType.UInt:
Gl.VertexAttribIPointer(
location,
arrayLength, arrayBaseType,
arrayStride, arraySection.Offset
);
break;
case VertexBaseType.Double:
Gl.VertexAttribLPointer(
location,
arrayLength, arrayBaseType,
arrayStride, arraySection.Offset
);
break;
default:
throw new NotSupportedException(String.Format("vertex attribute type {0} not supported", type));
}
// Enable vertex attribute
Gl.EnableVertexAttribArray(location);
}
