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//
// vaoMesh.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2016 jp
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
using System;
using OpenTK;
using OpenTK.Graphics.OpenGL;
namespace Crow
{
public class vaoMesh : IDisposable
{
public int vaoHandle,
positionVboHandle,
texVboHandle,
eboHandle;
public Vector3[] positions;
public Vector2[] texCoords;
public int[] indices;
public vaoMesh()
{
}
public vaoMesh (Vector3[] _positions, Vector2[] _texCoord, int[] _indices)
{
positions = _positions;
texCoords = _texCoord;
indices = _indices;
CreateBuffers ();
}
public vaoMesh (float x, float y, float z, float width, float height, float TileX = 1f, float TileY = 1f)
{
positions =
new Vector3[] {
new Vector3 (x - width / 2, y + height / 2, z),
new Vector3 (x - width / 2, y - height / 2, z),
new Vector3 (x + width / 2, y + height / 2, z),
new Vector3 (x + width / 2, y - height / 2, z)
};
texCoords = new Vector2[] {
new Vector2 (0, TileY),
new Vector2 (0, 0),
new Vector2 (TileX, TileY),
new Vector2 (TileX, 0)
};
indices = new int[] { 0, 1, 2, 3 };
CreateBuffers ();
}
public static vaoMesh CreateCube(){
vaoMesh tmp = new vaoMesh ();
tmp.positions = new Vector3[]
{
new Vector3(-1.0f, -1.0f, -1.0f),
new Vector3( -1.0f, -1.0f, 1.0f),
new Vector3( 1.0f, -1.0f, -1.0f),
new Vector3(1.0f, -1.0f, 1.0f),
new Vector3(1.0f, 1.0f, -1.0f),
new Vector3( 1.0f, 1.0f, 1.0f),
new Vector3( -1.0f, 1.0f, -1.0f),
new Vector3(-1.0f, 1.0f, 1.0f)
};
tmp.indices = new int[]
{
// front face
0, 2, 1, 1, 2, 3,
// top face
2, 4, 3, 3, 4, 5,
// back face
4, 6, 5, 5, 6, 7,
// left face
6, 0, 7, 7, 0, 1,
// bottom face
1, 3, 7, 7, 3, 5,
// right face
// 1, 5, 6, 6, 2, 1,
};
tmp.texCoords = new Vector2[]
{
new Vector2(0, 0),
new Vector2(0, 1),
new Vector2(1, 0),
new Vector2(1, 1),
new Vector2(0, 0),
new Vector2(0, 1),
new Vector2(1, 0),
new Vector2(1, 1),
};
tmp.CreateBuffers ();
return tmp;
// Normals = new Vector3[]
// {
// new Vector3(-1.0f, -1.0f, 1.0f),
// new Vector3( 1.0f, -1.0f, 1.0f),
// new Vector3( 1.0f, 1.0f, 1.0f),
// new Vector3(-1.0f, 1.0f, 1.0f),
// new Vector3(-1.0f, -1.0f, -1.0f),
// new Vector3( 1.0f, -1.0f, -1.0f),
// new Vector3( 1.0f, 1.0f, -1.0f),
// new Vector3(-1.0f, 1.0f, -1.0f),
// };
//
// Colors = new int[]
// {
// Utilities.ColorToRgba32(Color.DarkRed),
// Utilities.ColorToRgba32(Color.DarkRed),
// Utilities.ColorToRgba32(Color.Gold),
// Utilities.ColorToRgba32(Color.Gold),
// Utilities.ColorToRgba32(Color.DarkRed),
// Utilities.ColorToRgba32(Color.DarkRed),
// Utilities.ColorToRgba32(Color.Gold),
// Utilities.ColorToRgba32(Color.Gold),
// };
}
public void CreateBuffers(){
CreateVBOs ();
CreateVAOs ();
}
protected void CreateVBOs()
{
positionVboHandle = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, positionVboHandle);
GL.BufferData<Vector3>(BufferTarget.ArrayBuffer,
new IntPtr(positions.Length * Vector3.SizeInBytes),
positions, BufferUsageHint.StaticDraw);
if (texCoords != null) {
texVboHandle = GL.GenBuffer ();
GL.BindBuffer (BufferTarget.ArrayBuffer, texVboHandle);
GL.BufferData<Vector2> (BufferTarget.ArrayBuffer,
new IntPtr (texCoords.Length * Vector2.SizeInBytes),
texCoords, BufferUsageHint.StaticDraw);
}
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
if (indices != null) {
eboHandle = GL.GenBuffer ();
GL.BindBuffer (BufferTarget.ElementArrayBuffer, eboHandle);
GL.BufferData (BufferTarget.ElementArrayBuffer,
new IntPtr (sizeof(uint) * indices.Length),
indices, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
}
}
protected void CreateVAOs()
{
vaoHandle = GL.GenVertexArray();
GL.BindVertexArray(vaoHandle);
GL.EnableVertexAttribArray(0);
GL.BindBuffer(BufferTarget.ArrayBuffer, positionVboHandle);
GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, true, Vector3.SizeInBytes, 0);
if (texCoords != null) {
GL.EnableVertexAttribArray (1);
GL.BindBuffer (BufferTarget.ArrayBuffer, texVboHandle);
GL.VertexAttribPointer (1, 2, VertexAttribPointerType.Float, true, Vector2.SizeInBytes, 0);
}
if (indices != null)
GL.BindBuffer(BufferTarget.ElementArrayBuffer, eboHandle);
GL.BindVertexArray(0);
}
public void Render(BeginMode _primitiveType){
GL.BindVertexArray(vaoHandle);
if (indices == null)
GL.DrawArrays (_primitiveType, 0, positions.Length);
else
GL.DrawElements(_primitiveType, indices.Length,
DrawElementsType.UnsignedInt, IntPtr.Zero);
GL.BindVertexArray (0);
}
public void Render(BeginMode _primitiveType, int[] _customIndices){
GL.BindVertexArray(vaoHandle);
GL.DrawElements(_primitiveType, _customIndices.Length,
DrawElementsType.UnsignedInt, _customIndices);
GL.BindVertexArray (0);
}
public void Render(BeginMode _primitiveType, int instances){
GL.BindVertexArray(vaoHandle);
GL.DrawElementsInstanced(_primitiveType, indices.Length,
DrawElementsType.UnsignedInt, IntPtr.Zero, instances);
GL.BindVertexArray (0);
}
#region IDisposable implementation
public void Dispose ()
{
GL.DeleteBuffer (positionVboHandle);
GL.DeleteBuffer (texVboHandle);
GL.DeleteBuffer (eboHandle);
GL.DeleteVertexArray (vaoHandle);
}
#endregion
}
}
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