private void LoadBufferData(IDrawableShape shape)
{
shape.GetArraysforVbo(out _primitiveType, out _vertexT2fN3fV3Fs, out _indices);
_vertexBuffer.PositionData = shape.Vertices;
_vertexBuffer.NormalsData = shape.Normals;
_vertexBuffer.IndicesData = shape.Indices;
_vertexBuffer.PrimitiveType = _primitiveType;
}
public void GenerateVertexBuffer(string name, IDrawableShape shape, int program)
{
LoadBufferData(shape);
CalculateBufferSize();
// Generate Vertex Buffer Object and bind it so it is current.
GenerateVertexBuffer();
SendVertexBufferData();
// Generate Vertex Array Object and bind it so it is current.
GenerateVertexArray();
GetVertexArrayPointers(program);
// IMPORTANT: vertex array needs unbinding here to avoid rendering incorrectly
UnbindVertexArrayBuffer();
_vertexBuffers.Add(name, _vertexBuffer);
}
public void Remove(IDrawableShape shape)
{
}
public void Add(IDrawableShape shape)
{
shapes.Add(shape);
}
public void AddBufferObject(string name, IDrawableShape shape, int program)
{
BufferObject bufferObject = new BufferObject();
//bufferObject.PositionData = new Vector3d[1];
//bufferObject.NormalsData = new Vector3d[1];
VertexT2fN3fV3f[] vertexData;
uint[] indices;
PrimitiveType type;
shape.GetArraysforVBO(out type, out vertexData, out indices);
bufferObject.PositionData = shape.Vertices;
bufferObject.NormalsData = shape.Normals;
bufferObject.IndicesData = shape.Indices;
bufferObject.PrimitiveType = type;
int bufferHandle;
#region Get sizes of buffer stores
int sizeOfPositionData = Vector3.SizeInBytes * bufferObject.PositionData.Length;
int sizeOfNormalsData = Vector3.SizeInBytes * bufferObject.NormalsData.Length;
//int sizeOfColorData = Marshal.SizeOf(new Color4()) * bufferObject.ColorData.Length;
IntPtr bufferSize = new IntPtr(sizeOfPositionData + sizeOfNormalsData);
IntPtr noOffset = new IntPtr(0);
#endregion
// Generate Vertex Buffer Object and bind it so it is current.
GL.GenBuffers(1, out bufferHandle);
GL.BindBuffer(BufferTarget.ArrayBuffer, bufferHandle);
#region Save pointers generated by OpenGL here so i dont forget.
bufferObject.VboID = bufferHandle;
#endregion
#region Send all data to the Vertex Buffer
// Initialise storage space for the Vertex Buffer.
GL.BufferData(BufferTarget.ArrayBuffer, bufferSize, IntPtr.Zero, BufferUsageHint.StaticDraw);
// Send Position data.
GL.BufferSubData <Vector3>(
BufferTarget.ArrayBuffer, noOffset, new IntPtr(sizeOfPositionData), bufferObject.PositionData);
// Send Normals data, offset by size of Position data.
GL.BufferSubData <Vector3>(
BufferTarget.ArrayBuffer, new IntPtr(sizeOfPositionData), new IntPtr(sizeOfNormalsData), bufferObject.NormalsData);
GL.GenBuffers(1, out bufferHandle);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, bufferHandle);
GL.BufferData(
BufferTarget.ElementArrayBuffer, new IntPtr(sizeof(uint) * bufferObject.IndicesData.Length), bufferObject.IndicesData, BufferUsageHint.StaticDraw);
bufferObject.IboID = bufferHandle;
GL.BindBuffer(BufferTarget.ArrayBuffer, bufferObject.VboID);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, bufferObject.IboID);
#endregion
// GL3 allows us to store the vertex layout in a "vertex array object" (VAO).
// This means we do not have to re-issue VertexAttribPointer calls
// every time we try to use a different vertex layout - these calls are
// stored in the VAO so we simply need to bind the correct VAO.
// Generate Vertex Array Object and bind it so it is current.
GL.GenVertexArrays(1, out bufferHandle);
GL.BindVertexArray(bufferHandle);
bufferObject.VaoID = bufferHandle;
bufferHandle = GL.GetAttribLocation(program, "in_position");
GL.EnableVertexAttribArray(bufferHandle);
GL.BindBuffer(BufferTarget.ArrayBuffer, bufferObject.VboID);
GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, true, Vector3.SizeInBytes, 0);
GL.BindAttribLocation(program, bufferHandle, "in_position");
bufferHandle = GL.GetAttribLocation(program, "in_normal");
GL.EnableVertexAttribArray(bufferHandle);
GL.BindBuffer(BufferTarget.ArrayBuffer, bufferObject.VboID);
GL.VertexAttribPointer(1, 3, VertexAttribPointerType.Float, true, Vector3.SizeInBytes, sizeOfPositionData);
GL.BindAttribLocation(program, bufferHandle, "in_normal");
GL.BindBuffer(BufferTarget.ElementArrayBuffer, bufferObject.IboID);
// IMPORTANT: vertex array needs unbinding here to avoid rendering incorrectly
GL.BindVertexArray(0);
m_bufferStore.Add(name, bufferObject);
}