public IndexBuffer(GraphicsDevice graphicsDevice, IndexFormat format, ResourceUsage usage, int indexCount) : base(graphicsDevice, new System.Diagnostics.StackTrace(1))
{
if (indexCount <= 0)
{
throw new ArgumentOutOfRangeException("indexCount", indexCount, "indexCount must be bigger than zero.");
}
if (usage == ResourceUsage.Immutable)
{
throw new ArgumentException("data", "Immutable buffers must be initialized with data.");
}
EnumConverter.Convert(Format); //Check whether format is supported
this.Usage = usage;
this.Format = format;
SizeBytes = indexCount * graphicsDevice.GetSizeOf(format);
IboID = GL.GenBuffer();
if (graphicsDevice.OpenGLCapabilities.DirectStateAccess == DirectStateAccess.None)
{
graphicsDevice.BindManager.IndexBuffer = this;
GL.BufferData(BufferTarget.ElementArrayBuffer, new IntPtr(SizeBytes), IntPtr.Zero, EnumConverter.Convert(Usage));
}
else if (graphicsDevice.OpenGLCapabilities.DirectStateAccess == DirectStateAccess.Extension)
{
OpenTK.Graphics.OpenGL.GL.Ext.NamedBufferData(IboID, new IntPtr(SizeBytes), IntPtr.Zero, (OpenTK.Graphics.OpenGL.ExtDirectStateAccess)EnumConverter.Convert(Usage));
}
graphicsDevice.CheckGLError("IndexBuffer Constructor");
}
internal VertexBuffer(GraphicsDevice graphicsDevice, VertexDescription description, ResourceUsage usage, int vertexCount)
: base(graphicsDevice, new System.Diagnostics.StackTrace(1))
{
if (vertexCount <= 0)
{
throw new ArgumentException("vertexCount must not be smaller than/ equal to zero.", "vertexCount");
}
if (usage == ResourceUsage.Immutable)
{
throw new ArgumentException("data", "Immutable buffers must be initialized with data.");
}
this.Description = description;
this.Usage = usage;
VboID = GL.GenBuffer();
if (!graphicsDevice.OpenGLCapabilities.VertexAttribBinding)
{
VaoID = GL.GenVertexArray();
LayoutDirty = true;
}
SizeBytes = vertexCount * graphicsDevice.GetSizeOf(description);
if (graphicsDevice.OpenGLCapabilities.DirectStateAccess == DirectStateAccess.None)
{
graphicsDevice.BindManager.VertexBuffer = this;
GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(SizeBytes), IntPtr.Zero, EnumConverter.Convert(Usage));
}
else if (graphicsDevice.OpenGLCapabilities.DirectStateAccess == DirectStateAccess.Extension)
{
OpenTK.Graphics.OpenGL.GL.Ext.NamedBufferData(VboID, new IntPtr(SizeBytes), IntPtr.Zero, (OpenTK.Graphics.OpenGL.ExtDirectStateAccess)EnumConverter.Convert(Usage));
}
graphicsDevice.CheckGLError("VertexBuffer Constructor");
}
internal void SetVertexBuffer(int bindingPoint, IVertexBuffer buffer)
{
if (!graphicsDevice.OpenGLCapabilities.VertexAttribBinding)
{
throw new PlatformNotSupportedException("VertexAttribBinding is not supported");
}
if (buffer != currentVertexBuffers[bindingPoint])
{
if (buffer == null)
{
GL.BindVertexBuffer(bindingPoint, 0, (IntPtr)0, 0);
}
else
{
if (bindingPoint >= graphicsDevice.OpenGLCapabilities.MaxVertexAttribBindings)
{
throw new PlatformNotSupportedException("bindingPoint exceeds maximum amount of VertexAttribBindings");
}
if (currentVertexBuffer == buffer)
{
currentVertexBuffer = null;
}
VertexBuffer internalVertexBuffer = graphicsDevice.Cast <VertexBuffer>(buffer, "buffer");
int stride = graphicsDevice.GetSizeOf(internalVertexBuffer.Description);
if (stride > graphicsDevice.OpenGLCapabilities.MaxVertexAttribStride)
{
throw new GraphicsException(string.Format("The vertex size exceeds the maximum of {0}.", graphicsDevice.OpenGLCapabilities.MaxVertexAttribStride));
}
GL.BindVertexBuffer(0, internalVertexBuffer.VboID, (IntPtr)0, stride);
}
currentVertexBuffers[bindingPoint] = buffer;
}
}