public void Init()
{
Vao = new VertexBufferObject();
Vao.AddAttribute(0, 3, VertexAttribPointerType.Float, false, 32, 0);
Vao.AddAttribute(1, 3, VertexAttribPointerType.Float, false, 32, 12);
Vao.AddAttribute(2, 2, VertexAttribPointerType.Float, false, 32, 24);
Vao.Initialize();
UpdateVertexData();
}
public static void Init()
{
if (Length == 0)
{
int buffer = GL.GenBuffer();
vao = new VertexBufferObject(buffer);
vao.AddAttribute(0, 2, VertexAttribPointerType.Float, false, 16, 0);
vao.AddAttribute(1, 2, VertexAttribPointerType.Float, false, 16, 8);
vao.Initialize();
Vector2[] positions = new Vector2[4]
{
new Vector2(-1.0f, 1.0f),
new Vector2(-1.0f, -1.0f),
new Vector2(1.0f, 1.0f),
new Vector2(1.0f, -1.0f),
};
Vector2[] texCoords = new Vector2[4]
{
new Vector2(0.0f, 1.0f),
new Vector2(0.0f, 0.0f),
new Vector2(1.0f, 1.0f),
new Vector2(1.0f, 0.0f),
};
List <float> list = new List <float>();
for (int i = 0; i < 4; i++)
{
list.Add(positions[i].X);
list.Add(positions[i].Y);
list.Add(texCoords[i].X);
list.Add(texCoords[i].Y);
}
Length = 4;
float[] data = list.ToArray();
GL.BindBuffer(BufferTarget.ArrayBuffer, buffer);
GL.BufferData(BufferTarget.ArrayBuffer, sizeof(float) * data.Length, data, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
}
}
public void Init(bool forceUpdate)
{
if (Camera == null)
{
return;
}
if (Length == 0 || forceUpdate)
{
int buffer = GL.GenBuffer();
int indexBuffer = GL.GenBuffer();
vao = new VertexBufferObject(buffer, indexBuffer);
vao.AddAttribute(0, 3, VertexAttribPointerType.Float, false, 12, 0);
vao.Initialize();
float farPlane = Camera.ZFar;
float nearPlane = Camera.ZNear;
float tan = (float)Math.Tan(Camera.Fov / 2);
float aspect = Camera.AspectRatio;
float nearHeight = nearPlane * tan;
float nearWidth = nearHeight * aspect;
float farHeight = farPlane * tan;
float farWidth = farHeight * aspect;
Vector3[] vertices = new Vector3[8];
// near bottom left
vertices[2][0] = -nearWidth; vertices[2][1] = -nearHeight; vertices[2][2] = -nearPlane;
// near bottom right
vertices[3][0] = nearWidth; vertices[3][1] = -nearHeight; vertices[3][2] = -nearPlane;
// near top left
vertices[1][0] = -nearWidth; vertices[1][1] = nearHeight; vertices[1][2] = -nearPlane;
// near top right
vertices[0][0] = nearWidth; vertices[0][1] = nearHeight; vertices[0][2] = -nearPlane;
// far bottom left
vertices[6][0] = -farWidth; vertices[6][1] = -farHeight; vertices[6][2] = -farPlane;
// far bottom right
vertices[7][0] = farWidth; vertices[7][1] = -farHeight; vertices[7][2] = -farPlane;
// far top left
vertices[4][0] = -farWidth; vertices[5][1] = farHeight; vertices[5][2] = -farPlane;
// far top right
vertices[5][0] = farWidth; vertices[4][1] = farHeight; vertices[4][2] = -farPlane;
List <float> list = new List <float>();
for (int i = 0; i < vertices.Length; i++)
{
list.Add(vertices[i].X);
list.Add(vertices[i].Y);
list.Add(vertices[i].Z);
}
Length = vertices.Length;
float[] data = list.ToArray();
GL.BufferData(BufferTarget.ArrayBuffer, sizeof(float) * data.Length, data, BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, indexBuffer);
GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)(Indices.Length * sizeof(int)), Indices, BufferUsageHint.StaticDraw);
}
}
