/// <summary>
/// Creates a VertexArrayObject from a mesh expecting the MeshAttribute names as shader variable names for the attributes
/// </summary>
/// <param name="mesh">From which to load positions, indices, normals, texture coordinates</param>
/// <param name="shaderProgram">Used for the attribute location bindings</param>
/// <returns>A vertex array object</returns>
public static VAO FromMesh(Mesh mesh, IShaderProgram shaderProgram)
{
var vao = new VAO(PrimitiveType.Triangles);
foreach (var attributeName in mesh.AttributeNames)
{
var loc = shaderProgram.GetResourceLocation(ShaderResourceType.Attribute, attributeName);
var attribute = mesh.GetAttribute(attributeName);
var array = attribute.ToArray(); // copy
vao.SetAttribute(loc, array, attribute.BaseType, attribute.BaseTypeCount);
}
vao.SetIndex(mesh.IDs.ToArray());
return(vao);
}
/// <summary>
/// Creates a VertexArrayObject from a mesh expecting the MeshAttribute names as shader variable names for the attributes
/// </summary>
/// <param name="mesh">From which to load positions, indices, normals, texture coordinates</param>
/// <param name="shaderProgram">Used for the attribute location bindings</param>
/// <returns>A vertex array object</returns>
public static VAO FromMesh(DefaultMesh mesh, IShaderProgram shaderProgram)
{
var vao = new VAO(PrimitiveType.Triangles);
if (mesh.Position.Count > 0)
{
var loc = shaderProgram.GetResourceLocation(ShaderResourceType.Attribute, DefaultMesh.PositionName);
vao.SetAttribute(loc, mesh.Position.ToArray(), VertexAttribPointerType.Float, 3);
}
if (mesh.Normal.Count > 0)
{
var loc = shaderProgram.GetResourceLocation(ShaderResourceType.Attribute, DefaultMesh.NormalName);
vao.SetAttribute(loc, mesh.Normal.ToArray(), VertexAttribPointerType.Float, 3);
}
if (mesh.TexCoord.Count > 0)
{
var loc = shaderProgram.GetResourceLocation(ShaderResourceType.Attribute, DefaultMesh.TexCoordName);
vao.SetAttribute(loc, mesh.TexCoord.ToArray(), VertexAttribPointerType.Float, 2);
}
vao.SetIndex(mesh.IDs.ToArray());
return(vao);
}
/// <summary>
/// Creates the indexed draw call gl.
/// </summary>
/// <param name="primitiveType">Type of the primitive.</param>
/// <param name="drawElementsType">Type of the draw elements.</param>
/// <param name="idCount">The identifier count.</param>
/// <param name="instanceCount">The instance count.</param>
/// <param name="vao">The vao.</param>
/// <returns></returns>
public static Action CreateIndexedDrawCallGL(PrimitiveType primitiveType, DrawElementsType drawElementsType, int idCount, int instanceCount, VAO vao)
{
if (vao is null)
{
void Draw()
{
GL.DrawElementsInstanced(primitiveType, idCount, drawElementsType, (IntPtr)0, instanceCount);
}
return(Draw);
}
else
{
void Draw()
{
vao.Activate();
GL.DrawElementsInstanced(primitiveType, idCount, drawElementsType, (IntPtr)0, instanceCount);
vao.Deactivate();
}
return(Draw);
}
}
/// <summary>
/// Creates the draw call gl.
/// </summary>
/// <param name="primitiveType">Type of the primitive.</param>
/// <param name="elementCount">The element count.</param>
/// <param name="instanceCount">The instance count.</param>
/// <param name="vao">The vao.</param>
/// <returns></returns>
public static Action CreateDrawCallGL(PrimitiveType primitiveType, int elementCount, int instanceCount, VAO vao)
{
if (vao is null)
{
void Draw()
{
GL.DrawArraysInstanced(primitiveType, 0, elementCount, instanceCount);
}
return(Draw);
}
else
{
void Draw()
{
vao.Activate();
GL.DrawArraysInstanced(primitiveType, 0, elementCount, instanceCount);
vao.Deactivate();
}
return(Draw);
}
}