TriDevs.TriEngine.Graphics.Primitive Class Reference

Represents a primitive 2D shape composed of triangles. More...

Inheritance diagram for TriDevs.TriEngine.Graphics.Primitive:

Collaboration diagram for TriDevs.TriEngine.Graphics.Primitive:

Public Member Functions
void	Draw ()
	Draw the object to screen. More...
void	Dispose ()

Protected Member Functions
	Primitive (ushort[] indices, Vector3[] vectors, Color[] colors=null)
	Primitive (ushort[] indices, float[] vertices, Color[] colors=null)

Protected Attributes
uint[]	Ids
uint	ColorId
ushort[]	Indices
float[]	Vertices
int[]	Colors

Properties
uint	IndicesID [get]
	Indices buffer ID assigned to this primitive by GL.BindBuffer. More...
uint	VerticesID [get]
	Vertices buffer ID assigned to this primitive by GL.BindBuffer. More...
uint	ColorID [get]
	Color buffer ID assigned to this primitive by GL.BindBuffer. More...

Detailed Description

Represents a primitive 2D shape composed of triangles.

Constructor & Destructor Documentation

TriDevs.TriEngine.Graphics.Primitive.Primitive ( ushort[]  indices, Vector3[]  vectors, Color[]  colors = null  )

protected

            : this(indices, vectors.ToFloatArray(), colors)
        {
        }

TriDevs.TriEngine.Graphics.Primitive.Primitive ( ushort[]  indices, float[]  vertices, Color[]  colors = null  )

protected

        {
            if (indices.Length % 3 != 0)
                throw new EngineException(
                    "Primitives can only be composed of a series of triangles. Expected n*3 points, got " +
                    vertices.Length + ".",
                    new ArgumentException("Unexpected number of array items.", "indices"));

            Indices = indices;
            Vertices = vertices;

            Ids = new uint[2];

            GL.GenBuffers(2, Ids);

            GL.BindBuffer(BufferTarget.ElementArrayBuffer, IndicesID);
            GL.BufferData(BufferTarget.ElementArrayBuffer, new IntPtr(Indices.Length * sizeof(ushort)), Indices, BufferUsageHint.StaticDraw);
            GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);

            GL.BindBuffer(BufferTarget.ArrayBuffer, VerticesID);
            GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(Vertices.Length * sizeof(float)), Vertices, BufferUsageHint.StaticDraw);
            GL.BindBuffer(BufferTarget.ArrayBuffer, 0);

            if (colors != null)
            {
                Colors = new int[colors.Length];
                for (int i = 0; i < colors.Length; i++)
                    Colors[i] = colors[i].ToColor4().ToArgb();

                GL.GenBuffers(1, out ColorId);
                GL.BindBuffer(BufferTarget.ArrayBuffer, ColorID);
                GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(Colors.Length * sizeof(int)), Colors, BufferUsageHint.StaticDraw);
                GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
            }
        }

Member Function Documentation

void TriDevs.TriEngine.Graphics.Primitive.Dispose

(

)

        {
            GL.DeleteBuffers(2, Ids);

            if (ColorID != 0)
                GL.DeleteBuffers(1, ref ColorId);
        }

void TriDevs.TriEngine.Graphics.Primitive.Draw

(

)

Draw the object to screen.

Implements TriDevs.TriEngine.Interfaces.IDrawable.

        {
            GL.PushClientAttrib(ClientAttribMask.ClientVertexArrayBit);

            GL.EnableClientState(ArrayCap.VertexArray);

            if (ColorID != 0)
            {
                GL.EnableClientState(ArrayCap.ColorArray);
                GL.BindBuffer(BufferTarget.ArrayBuffer, ColorID);
                GL.ColorPointer(sizeof(int), ColorPointerType.UnsignedByte, 0, 0);
            }

            GL.BindBuffer(BufferTarget.ArrayBuffer, VerticesID);
            GL.VertexPointer(3, VertexPointerType.Float, 0, 0);

            GL.BindBuffer(BufferTarget.ElementArrayBuffer, IndicesID);
            GL.DrawElements(BeginMode.Triangles, Indices.Length, DrawElementsType.UnsignedShort, 0);
            
            GL.PopClientAttrib();
        }

Member Data Documentation

uint TriDevs.TriEngine.Graphics.Primitive.ColorId

protected

int [] TriDevs.TriEngine.Graphics.Primitive.Colors

protected

uint [] TriDevs.TriEngine.Graphics.Primitive.Ids

protected

ushort [] TriDevs.TriEngine.Graphics.Primitive.Indices

protected

float [] TriDevs.TriEngine.Graphics.Primitive.Vertices

protected

Property Documentation

uint TriDevs.TriEngine.Graphics.Primitive.ColorID

get

Color buffer ID assigned to this primitive by GL.BindBuffer.

uint TriDevs.TriEngine.Graphics.Primitive.IndicesID

get

Indices buffer ID assigned to this primitive by GL.BindBuffer.

uint TriDevs.TriEngine.Graphics.Primitive.VerticesID

get

Vertices buffer ID assigned to this primitive by GL.BindBuffer.

---

The documentation for this class was generated from the following file:

• TriDevs.TriEngine/Graphics/Primitive.cs