public GLESHardwareIndexBuffer(HardwareBufferManagerBase manager, IndexType type, int numIndices, BufferUsage usage, bool useShadowBuffer)
: base(manager, type, numIndices, usage, false, useShadowBuffer)
{
if (type == IndexType.Size32)
{
throw new AxiomException("32 bit hardware buffers are not allowed in OpenGL ES.");
}
if (!useShadowBuffer)
{
throw new AxiomException("Only support with shadowBuffer");
}
OpenGL.GenBuffers(1, ref this._bufferId);
GLESConfig.GlCheckError(this);
if (this._bufferId == 0)
{
throw new AxiomException("Cannot create GL index buffer");
}
OpenGL.BindBuffer(All.ElementArrayBuffer, this._bufferId);
GLESConfig.GlCheckError(this);
OpenGL.BufferData(All.ElementArrayBuffer, new IntPtr(sizeInBytes), IntPtr.Zero, GLESHardwareBufferManager.GetGLUsage(usage));
GLESConfig.GlCheckError(this);
}
internal void GenerateBuffer <T>() where T : struct, IVertexType
{
var vd = VertexDeclaration.FromType(_type);
_size = vd.VertexStride * ((T[])_buffer).Length;
All11 bufferUsage = (_bufferUsage == BufferUsage.WriteOnly) ? All11.StaticDraw : All11.DynamicDraw;
GL11.GenBuffers(1, out _bufferStore);
GL11.BindBuffer(All11.ArrayBuffer, _bufferStore);
GL11.BufferData <T>(All11.ArrayBuffer, (IntPtr)_size, (T[])_buffer, bufferUsage);
}
/// <summary>
/// </summary>
protected override void UpdateFromShadow()
{
if (useShadowBuffer && shadowUpdated && !suppressHardwareUpdate)
{
var srcData = shadowBuffer.Lock(lockStart, lockSize, BufferLocking.ReadOnly);
OpenGL.BindBuffer(All.ElementArrayBuffer, this._bufferId);
GLESConfig.GlCheckError(this);
var srcPtr = new IntPtr(srcData.Ptr);
// Update whole buffer if possible, otherwise normal
if (lockStart == 0 && lockSize == sizeInBytes)
{
OpenGL.BufferData(All.ElementArrayBuffer, new IntPtr(sizeInBytes), srcPtr, GLESHardwareBufferManager.GetGLUsage(usage));
GLESConfig.GlCheckError(this);
}
else
{
OpenGL.BufferSubData(All.ElementArrayBuffer, new IntPtr(lockStart), new IntPtr(lockSize), srcPtr);
GLESConfig.GlCheckError(this);
}
shadowBuffer.Unlock();
shadowUpdated = false;
}
}
/// <summary>
/// </summary>
/// <param name="offset"> </param>
/// <param name="length"> </param>
/// <param name="src"> </param>
/// <param name="discardWholeBuffer"> </param>
public override void WriteData(int offset, int length, BufferBase src, bool discardWholeBuffer)
{
OpenGL.BindBuffer(All.ElementArrayBuffer, this._bufferId);
GLESConfig.GlCheckError(this);
// Update the shadow buffer
if (useShadowBuffer)
{
var destData = shadowBuffer.Lock(offset, length, discardWholeBuffer ? BufferLocking.Discard : BufferLocking.Normal);
Memory.Copy(src, destData, length);
shadowBuffer.Unlock();
}
var srcPtr = src.Ptr;
if (offset == 0 && length == sizeInBytes)
{
OpenGL.BufferData(All.ElementArrayBuffer, new IntPtr(sizeInBytes), ref srcPtr, GLESHardwareBufferManager.GetGLUsage(usage));
GLESConfig.GlCheckError(this);
}
else
{
if (discardWholeBuffer)
{
OpenGL.BufferData(All.ElementArrayBuffer, new IntPtr(sizeInBytes), IntPtr.Zero, GLESHardwareBufferManager.GetGLUsage(usage));
GLESConfig.GlCheckError(this);
}
// Now update the real buffer
OpenGL.BufferSubData(All.ElementArrayBuffer, new IntPtr(offset), new IntPtr(length), ref srcPtr);
GLESConfig.GlCheckError(this);
}
if (src.Ptr != srcPtr)
{
LogManager.Instance.Write("[GLES2] HardwareIndexBuffer.WriteData - buffer pointer modified by GL.BufferData.");
}
}
/// <summary>
/// </summary>
/// <param name="offset"> </param>
/// <param name="length"> </param>
/// <param name="locking"> </param>
/// <returns> </returns>
protected override BufferBase LockImpl(int offset, int length, BufferLocking locking)
{
All access = 0;
if (isLocked)
{
throw new AxiomException("Invalid attempt to lock an index buffer that has already been locked");
}
BufferBase retPtr = null;
if (length < MapBufferThreshold)
{
retPtr = ((GLESHardwareBufferManager)HardwareBufferManager.Instance).AllocateScratch(length);
if (retPtr != null)
{
this._lockedToScratch = true;
this._scratchOffset = offset;
this._scratchSize = length;
this._scratchPtr = retPtr;
this._scratchUploadOnUnlock = (locking != BufferLocking.ReadOnly);
if (locking != BufferLocking.Discard)
{
this.ReadData(offset, length, retPtr);
}
}
}
else
{
throw new AxiomException("Invalid Buffer lockSize");
}
if (retPtr == null)
{
OpenGL.BindBuffer(All.ElementArrayBuffer, this._bufferId);
GLESConfig.GlCheckError(this);
// Use glMapBuffer
if (locking == BufferLocking.Discard)
{
OpenGL.BufferData(All.ElementArrayBuffer, new IntPtr(sizeInBytes), IntPtr.Zero, GLESHardwareBufferManager.GetGLUsage(usage));
GLESConfig.GlCheckError(this);
}
if ((usage & BufferUsage.WriteOnly) != 0)
{
access = All.WriteOnlyOes;
}
IntPtr pBuffer = OpenGLOES.MapBuffer(All.ElementArrayBuffer, access);
GLESConfig.GlCheckError(this);
if (pBuffer == IntPtr.Zero)
{
throw new AxiomException("Index Buffer: Out of memory");
}
unsafe
{
// return offset
retPtr = BufferBase.Wrap(pBuffer, sizeInBytes);
}
this._lockedToScratch = false;
}
isLocked = true;
return(retPtr);
}