public void RenderObject()
{
// set up
float[] vertices = new float[] { -0.5f, -0.5f, 0.0f, 0.5f, -0.5f, 0.0f, 0.0f, 0.5f, 0.0f };
int vao;
VertexBufferObject <float> vbo;
GL.GenVertexArrays(1, out vao);
vbo = new VertexBufferObject <float>(sizeof(float), vertices);
GL.BindVertexArray(vao);
vbo.BindBuffer();
vbo.CreateBuffer(BufferUsageHint.StaticDraw);
GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, 3 * sizeof(float), 0);
GL.EnableVertexAttribArray(0);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.BindVertexArray(0);
//actual renderering
GL.ClearColor(OpenTK.Graphics.Color4.CornflowerBlue);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
shaderMgr.InitialiseAShader("test1");
shaderMgr.GetShader("test1").Use();
GL.BindVertexArray(vao);
vbo.Draw(PrimitiveType.Triangles);
GL.BindVertexArray(0);
}
/// <summary>
/// Creates a VAO and VBO object from an array of vertices, the shader, an array of attributes
/// </summary>
/// <param name="vertices"> the vertex array</param>
/// <param name="shaderIndex">index of the shader being used for that object</param>
/// <param name="vbo">vbo object for output</param>
/// <param name="vao">vao object for output</param>
/// <param name="attributes">attribute or attributes(in an array if more than one)</param>
public void CreateBufferObjects(Vertex[] vertices, string shaderName, out VertexBufferObject <Vertex> vbo, out VertexArrayObject <Vertex> vao,
params BufferObjects.VertexAttribute[] attributes)
{
VertexArrayObject <Vertex> thevao = new VertexArrayObject <Vertex>();
VertexBufferObject <Vertex> thevbo = new VertexBufferObject <Vertex>(Vertex.Size, vertices);
thevbo.CreateBuffer();
thevao.SetAttributes(thevbo, shaderMgr.GetShader(shaderName), attributes);
vbo = thevbo;
vao = thevao;
}
private void CreateBackgroundConeBuffers(Vertex[] vertices)
{
//first set up the attributes
BufferObjects.VertexAttribute[] attribute = new BufferObjects.VertexAttribute[3];
attribute[0] = new BufferObjects.VertexAttribute("position", 3, OpenTK.Graphics.OpenGL.VertexAttribPointerType.Float,
Vertex.Size, 0);
attribute[1] = new BufferObjects.VertexAttribute("normal", 3, OpenTK.Graphics.OpenGL.VertexAttribPointerType.Float,
Vertex.Size, Vector3.SizeInBytes);
attribute[2] = new BufferObjects.VertexAttribute("texcoord", 2, OpenTK.Graphics.OpenGL.VertexAttribPointerType.Float,
Vertex.Size, 2 * Vector3.SizeInBytes);
BGvao = new VertexArrayObject <Vertex>();
BGvbo = new VertexBufferObject <Vertex>(Vertex.Size, vertices);
BGvbo.CreateBuffer(BufferUsageHint.StaticDraw);
BGvao.SetAttributes(BGvbo, shaderMgr.GetShader("BackgroundNoFog"), attribute);
BGvao.Bind();
// create the EBO
int[] EBOindices = new int[]
#region
{ 0, 1, 3, 2,
2, 3, 5, 4,
4, 5, 7, 6,
6, 7, 9, 8,
8, 9, 11, 10,
10, 11, 13, 12,
12, 13, 15, 14,
14, 15, 17, 16,
16, 17, 19, 18,
18, 19, 21, 20,
20, 21, 23, 22,
22, 23, 25, 24,
24, 25, 27, 26,
26, 27, 29, 28,
28, 29, 31, 30,
30, 31, 33, 32,
32, 33, 35, 34,
34, 35, 37, 36,
36, 37, 39, 38,
38, 39, 41, 40,
40, 41, 43, 42,
42, 43, 45, 44,
44, 45, 47, 46,
46, 47, 49, 48,
48, 49, 51, 50,
50, 51, 53, 52,
52, 53, 55, 54,
54, 55, 57, 56,
56, 57, 59, 58,
58, 59, 61, 60,
60, 61, 63, 62,
62, 63, 1, 0 };
#endregion
//side walls
BGSideWallebo = new ElementBufferObject(EBOindices);
BGSideWallebo.CreateBuffer(BufferUsageHint.StaticDraw);
EBOindices = null;
//caps
EBOindices = new int[]
#region
{
0, 2, 64,
2, 4, 64,
4, 6, 64,
6, 8, 64,
8, 10, 64,
10, 12, 64,
12, 14, 64,
14, 16, 64,
16, 18, 64,
18, 20, 64,
20, 22, 64,
22, 24, 64,
24, 26, 64,
26, 28, 64,
28, 30, 64,
30, 32, 64,
32, 34, 64,
34, 36, 64,
36, 38, 64,
38, 40, 64,
40, 42, 64,
42, 44, 64,
44, 46, 64,
46, 48, 64,
48, 50, 64,
50, 52, 64,
52, 54, 64,
54, 56, 64,
56, 58, 64,
58, 60, 64,
60, 62, 64,
62, 0, 64,
65, 3, 1,
65, 5, 3,
65, 7, 5,
65, 9, 7,
65, 11, 9,
65, 13, 11,
65, 15, 13,
65, 17, 15,
65, 19, 17,
65, 21, 19,
65, 23, 21,
65, 25, 23,
65, 27, 25,
65, 29, 27,
65, 31, 29,
65, 33, 31,
65, 35, 33,
65, 37, 35,
65, 39, 37,
65, 41, 39,
65, 43, 41,
65, 45, 43,
65, 47, 45,
65, 49, 47,
65, 51, 49,
65, 53, 51,
65, 55, 53,
65, 57, 55,
65, 59, 57,
65, 61, 59,
65, 63, 61,
65, 1, 63,
};
#endregion
BGCapsebo = new ElementBufferObject(EBOindices);
BGCapsebo.CreateBuffer(BufferUsageHint.StaticDraw);
BGvao.UnBind();
BGvbo.UnBind();
BGSideWallebo.Unbind();
BGCapsebo.Unbind();
}