/// <summary>
/// Get the number of components of the vertex array buffer item.
/// </summary>
/// <param name="shaderAttributeType">
/// A <see cref="ShaderAttributeType"/> that describe the vertex array buffer item.
/// </param>
/// <returns>
/// It returns the count of the components of the vertex array buffer item. It will be a value
/// from 1 (inclusive) to 4 (inclusive). For matrices, this value indicates the matrix height (column-major order).
/// </returns>
public static uint GetArrayLength(this ShaderAttributeType shaderAttributeType)
{
switch (shaderAttributeType)
{
case ShaderAttributeType.Float:
case ShaderAttributeType.Double:
case ShaderAttributeType.Int:
case ShaderAttributeType.UInt:
return(1);
case ShaderAttributeType.Vec2:
case ShaderAttributeType.DoubleVec2:
case ShaderAttributeType.IntVec2:
case ShaderAttributeType.UIntVec2:
return(2);
case ShaderAttributeType.Vec3:
case ShaderAttributeType.DoubleVec3:
case ShaderAttributeType.IntVec3:
case ShaderAttributeType.UIntVec3:
return(3);
case ShaderAttributeType.Vec4:
case ShaderAttributeType.DoubleVec4:
case ShaderAttributeType.IntVec4:
case ShaderAttributeType.UIntVec4:
return(4);
case ShaderAttributeType.Mat2x2:
case ShaderAttributeType.Mat2x3:
case ShaderAttributeType.Mat2x4:
case ShaderAttributeType.DoubleMat2x2:
case ShaderAttributeType.DoubleMat2x3:
case ShaderAttributeType.DoubleMat2x4:
return(2);
case ShaderAttributeType.Mat3x2:
case ShaderAttributeType.Mat3x3:
case ShaderAttributeType.Mat3x4:
case ShaderAttributeType.DoubleMat3x2:
case ShaderAttributeType.DoubleMat3x3:
case ShaderAttributeType.DoubleMat3x4:
return(3);
case ShaderAttributeType.Mat4x2:
case ShaderAttributeType.Mat4x3:
case ShaderAttributeType.Mat4x4:
case ShaderAttributeType.DoubleMat4x2:
case ShaderAttributeType.DoubleMat4x3:
case ShaderAttributeType.DoubleMat4x4:
return(4);
default:
throw new NotSupportedException("unsupported vertex array length of " + shaderAttributeType);
}
}
/// <summary>
/// Get the array components base type of the vertex array buffer item.
/// </summary>
/// <param name="vertexArrayType">
/// A <see cref="ArrayBufferItemType"/> that describe the vertex array buffer item.
/// </param>
/// <returns>
/// It returns a <see cref="VertexBaseType"/> indicating the type of the components of
/// the vertex array buffer item.
/// </returns>
public static VertexBaseType GetVertexBaseType(this ShaderAttributeType vertexArrayType)
{
switch (vertexArrayType)
{
case ShaderAttributeType.Float:
case ShaderAttributeType.Vec2:
case ShaderAttributeType.Vec3:
case ShaderAttributeType.Vec4:
case ShaderAttributeType.Mat2x2:
case ShaderAttributeType.Mat2x3:
case ShaderAttributeType.Mat2x4:
case ShaderAttributeType.Mat3x2:
case ShaderAttributeType.Mat3x3:
case ShaderAttributeType.Mat3x4:
case ShaderAttributeType.Mat4x2:
case ShaderAttributeType.Mat4x3:
case ShaderAttributeType.Mat4x4:
return(VertexBaseType.Float);
#if !MONODROID
case ShaderAttributeType.Double:
case ShaderAttributeType.DoubleVec2:
case ShaderAttributeType.DoubleVec3:
case ShaderAttributeType.DoubleVec4:
case ShaderAttributeType.DoubleMat2x2:
case ShaderAttributeType.DoubleMat2x3:
case ShaderAttributeType.DoubleMat2x4:
case ShaderAttributeType.DoubleMat3x2:
case ShaderAttributeType.DoubleMat3x3:
case ShaderAttributeType.DoubleMat3x4:
case ShaderAttributeType.DoubleMat4x2:
case ShaderAttributeType.DoubleMat4x3:
case ShaderAttributeType.DoubleMat4x4:
return(VertexBaseType.Double);
#endif
case ShaderAttributeType.Int:
case ShaderAttributeType.IntVec2:
case ShaderAttributeType.IntVec3:
case ShaderAttributeType.IntVec4:
return(VertexBaseType.Int);
case ShaderAttributeType.UInt:
case ShaderAttributeType.UIntVec2:
case ShaderAttributeType.UIntVec3:
case ShaderAttributeType.UIntVec4:
return(VertexBaseType.UInt);
default:
throw new NotSupportedException("unsupported vertex array base type of " + vertexArrayType);
}
}
/// <summary>
/// Get the array components base type of the vertex array attribute item type.
/// </summary>
/// <param name="shaderAttributeType">
/// A <see cref="ShaderAttributeType"/> that describe the vertex array attribute item type.
/// </param>
/// <returns>
/// It returns a <see cref="VertexBaseType"/> indicating the type of the components of
/// the vertex array buffer item.
/// </returns>
public static VertexBaseType GetArrayBaseType(ShaderAttributeType shaderAttributeType)
{
switch (shaderAttributeType)
{
case ShaderAttributeType.Float:
case ShaderAttributeType.Vec2:
case ShaderAttributeType.Vec3:
case ShaderAttributeType.Vec4:
case ShaderAttributeType.Mat2x2:
case ShaderAttributeType.Mat3x3:
case ShaderAttributeType.Mat4x4:
case ShaderAttributeType.Mat2x3:
case ShaderAttributeType.Mat2x4:
case ShaderAttributeType.Mat3x2:
case ShaderAttributeType.Mat3x4:
case ShaderAttributeType.Mat4x2:
case ShaderAttributeType.Mat4x3:
return(VertexBaseType.Float);
case ShaderAttributeType.Int:
case ShaderAttributeType.IntVec2:
case ShaderAttributeType.IntVec3:
case ShaderAttributeType.IntVec4:
return(VertexBaseType.Int);
case ShaderAttributeType.UInt:
case ShaderAttributeType.UIntVec2:
case ShaderAttributeType.UIntVec3:
case ShaderAttributeType.UIntVec4:
return(VertexBaseType.UInt);
#if !MONODROID
case ShaderAttributeType.Double:
case ShaderAttributeType.DoubleVec2:
case ShaderAttributeType.DoubleVec3:
case ShaderAttributeType.DoubleVec4:
case ShaderAttributeType.DoubleMat2x2:
case ShaderAttributeType.DoubleMat3x3:
case ShaderAttributeType.DoubleMat4x4:
case ShaderAttributeType.DoubleMat2x3:
case ShaderAttributeType.DoubleMat2x4:
case ShaderAttributeType.DoubleMat3x2:
case ShaderAttributeType.DoubleMat3x4:
case ShaderAttributeType.DoubleMat4x2:
case ShaderAttributeType.DoubleMat4x3:
return(VertexBaseType.Double);
#endif
default:
throw new ArgumentException(String.Format("unrecognized shader attribute type {0}", shaderAttributeType));
}
}
/// <summary>
/// Get the correponding type for the column of the matrix type.
/// </summary>
/// <param name="vertexArrayType">
/// A <see cref="ShaderAttributeType"/> that describe the vertex array buffer item.
/// </param>
/// <returns>
/// It returns a boolean value indicating whether <paramref name="vertexArrayType"/> is a matrix type.
/// </returns>
public static ShaderAttributeType GetMatrixColumnType(this ShaderAttributeType vertexArrayType)
{
switch (vertexArrayType)
{
case ShaderAttributeType.Mat2x2:
case ShaderAttributeType.Mat2x3:
case ShaderAttributeType.Mat2x4:
return(ShaderAttributeType.Vec2);
case ShaderAttributeType.Mat3x2:
case ShaderAttributeType.Mat3x3:
case ShaderAttributeType.Mat3x4:
return(ShaderAttributeType.Vec3);
case ShaderAttributeType.Mat4x2:
case ShaderAttributeType.Mat4x3:
case ShaderAttributeType.Mat4x4:
return(ShaderAttributeType.Vec4);
#if !MONODROID
case ShaderAttributeType.DoubleMat2x2:
case ShaderAttributeType.DoubleMat2x3:
case ShaderAttributeType.DoubleMat2x4:
return(ShaderAttributeType.DoubleVec2);
case ShaderAttributeType.DoubleMat3x2:
case ShaderAttributeType.DoubleMat3x3:
case ShaderAttributeType.DoubleMat3x4:
return(ShaderAttributeType.DoubleVec3);
case ShaderAttributeType.DoubleMat4x2:
case ShaderAttributeType.DoubleMat4x3:
case ShaderAttributeType.DoubleMat4x4:
return(ShaderAttributeType.DoubleVec4);
#endif
default:
throw new ArgumentException();
}
}
public ShaderAttribute(ShaderAttributeType type, string name)
{
Type = type;
Location = -1;
Name = name;
}
public bool HasAttribute(ShaderAttributeType type)
{
return _attributes.ContainsKey(type);
}
public int GetAttributeLocation(ShaderAttributeType type)
{
return _attributes[type].Location;
}
public static extern int GetAttributeType(int handle, int index, out ShaderAttributeType result);
/// <summary>
/// Get whether a <see cref="ShaderAttributeType"/> is a matrix type (mat2, mat4, ...).
/// </summary>
/// <param name="vertexArrayType">
/// A <see cref="ShaderAttributeType"/> that describe the vertex array buffer item.
/// </param>
/// <returns>
/// It returns a boolean value indicating whether <paramref name="vertexArrayType"/> is a matrix type.
/// </returns>
public static bool IsArrayMatrixType(this ShaderAttributeType vertexArrayType)
{
return(GetArrayRank(vertexArrayType) > 1);
}
/// <summary>
/// Construct a FeedbackBinding, specifing the type of the size of the feedback attribute.
/// </summary>
/// <param name="type">
/// A <see cref="ShaderAttributeType"/> that specify the type of the components of the feedback attribute.
/// </param>
/// <param name="size">
/// A <see cref="UInt32"/> that specify the feedback size, in terms of <see cref="type"/>.
/// </param>
public FeedbackBinding(ShaderAttributeType type, uint size)
{
Type = type;
Size = size;
}
/// <summary>
/// Get the rank of the vertex array buffer item (that is, the number of <i>vec4</i> attributes requires).
/// </summary>
/// <param name="shaderAttributeType">
/// A <see cref="ShaderAttributeType"/> that describe the vertex array buffer item.
/// </param>
/// <returns>
/// It returns the rank of the vertex array buffer item. It will be a value
/// from 1 (inclusive) to 4 (inclusive). For matrices, this value indicates the matrix width (column-major order),
/// while for simpler types the value will be 1.
/// </returns>
public static uint GetArrayRank(this ShaderAttributeType shaderAttributeType)
{
switch (shaderAttributeType)
{
case ShaderAttributeType.Mat2x2:
case ShaderAttributeType.Mat3x2:
case ShaderAttributeType.Mat4x2:
#if !MONODROID
case ShaderAttributeType.DoubleMat2x2:
case ShaderAttributeType.DoubleMat3x2:
case ShaderAttributeType.DoubleMat4x2:
#endif
return(2);
case ShaderAttributeType.Mat2x3:
case ShaderAttributeType.Mat3x3:
case ShaderAttributeType.Mat4x3:
#if !MONODROID
case ShaderAttributeType.DoubleMat2x3:
case ShaderAttributeType.DoubleMat3x3:
case ShaderAttributeType.DoubleMat4x3:
#endif
return(3);
case ShaderAttributeType.Mat2x4:
case ShaderAttributeType.Mat3x4:
case ShaderAttributeType.Mat4x4:
#if !MONODROID
case ShaderAttributeType.DoubleMat2x4:
case ShaderAttributeType.DoubleMat3x4:
case ShaderAttributeType.DoubleMat4x4:
#endif
return(4);
case ShaderAttributeType.Float:
#if !MONODROID
case ShaderAttributeType.Double:
#endif
case ShaderAttributeType.Int:
case ShaderAttributeType.UInt:
case ShaderAttributeType.Vec2:
#if !MONODROID
case ShaderAttributeType.DoubleVec2:
#endif
case ShaderAttributeType.IntVec2:
case ShaderAttributeType.UIntVec2:
case ShaderAttributeType.Vec3:
#if !MONODROID
case ShaderAttributeType.DoubleVec3:
#endif
case ShaderAttributeType.IntVec3:
case ShaderAttributeType.UIntVec3:
case ShaderAttributeType.Vec4:
#if !MONODROID
case ShaderAttributeType.DoubleVec4:
#endif
case ShaderAttributeType.IntVec4:
case ShaderAttributeType.UIntVec4:
return(1);
default:
throw new NotSupportedException("unsupported vertex array rank of " + shaderAttributeType);
}
}
/// <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 override void EnableVertexAttribute(GraphicsContext ctx, uint location, ShaderAttributeType type)
{
// Base implementation
base.EnableVertexAttribute(ctx, location, type);
// Attribute divisor
Gl.VertexAttribDivisor(location, Divisor);
}
/// <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);
}
/// <summary>
///
/// </summary>
/// <param name="location"></param>
/// <param name="type"></param>
public AttributeBinding(uint location, ShaderAttributeType type)
{
Location = location;
Type = type;
}
/// <summary>
/// Get whether a <see cref="ShaderAttributeType"/> is a vector type (vec2, vec3, ...).
/// </summary>
/// <param name="vertexArrayType">
/// A <see cref="ShaderAttributeType"/> that describe the vertex array buffer item.
/// </param>
/// <returns>
/// It returns a boolean value indicating whether <paramref name="vertexArrayType"/> is a vector type.
/// </returns>
public static bool IsArrayVectorType(this ShaderAttributeType vertexArrayType)
{
return((vertexArrayType.GetArrayLength() > 1) && (vertexArrayType.GetArrayRank() == 1));
}
/// <summary>
/// Construct a FeedbackBinding, specifing the type of the size of the feedback attribute.
/// </summary>
/// <param name="type">
/// A <see cref="ShaderAttributeType"/> that specify the type of the components of the feedback attribute.
/// </param>
/// <param name="size">
/// A <see cref="UInt32"/> that specify the feedback size, in terms of <see cref="type"/>.
/// </param>
public FeedbackBinding(ShaderAttributeType type, uint size)
{
Type = type;
Size = size;
}
/// <summary>
///
/// </summary>
/// <param name="location"></param>
/// <param name="type"></param>
public AttributeBinding(uint location, ShaderAttributeType type)
{
Location = location;
Type = type;
}
