public void LoadSubData(IntPtr offset, IntPtr data, int size)
{
if (size < 0)
{
throw new ArgumentException("Size cannot be less than zero.");
}
if (this.bufferSize == 0)
{
throw new InvalidOperationException(string.Format(
"Cannot update {0}, because its storage was not initialized yet.",
typeof(NativeGraphicsBuffer).Name));
}
if ((uint)offset + size > this.bufferSize)
{
throw new ArgumentException(string.Format(
"Cannot update {0} with offset {1} and size {2}, as this exceeds the internal " +
"storage size {3}.",
typeof(NativeGraphicsBuffer).Name,
offset,
size,
this.bufferSize));
}
NativeGraphicsBuffer prevBound = GetBound(this.type);
Bind(this.type, this);
BufferTarget target = ToOpenTKBufferType(this.type);
GL.BufferSubData(target, offset, size, data);
Bind(this.type, prevBound);
}
public static void Bind(GraphicsBufferType type, NativeGraphicsBuffer buffer)
{
if (GetBound(type) == buffer)
{
return;
}
SetBound(type, buffer);
BufferTarget target = ToOpenTKBufferType(type);
GL.BindBuffer(target, buffer != null ? buffer.Handle : 0);
}
private static void SetBound(GraphicsBufferType type, NativeGraphicsBuffer buffer)
{
if (type == GraphicsBufferType.Vertex)
{
boundVertex = buffer;
}
else if (type == GraphicsBufferType.Index)
{
boundIndex = buffer;
}
else
{
return;
}
}
public void SetupEmpty(int size)
{
if (size < 0)
{
throw new ArgumentException("Size cannot be less than zero.");
}
NativeGraphicsBuffer prevBound = GetBound(this.type);
Bind(this.type, this);
BufferTarget target = ToOpenTKBufferType(this.type);
GL.BufferData(target, size, IntPtr.Zero, BufferUsageHint.StreamDraw);
this.bufferSize = size;
Bind(this.type, prevBound);
}
void IGraphicsBackend.Render(IReadOnlyList <DrawBatch> batches)
{
if (batches.Count == 0)
{
return;
}
this.RetrieveActiveShaders(batches);
this.SetupSharedParameters(this.renderOptions.ShaderParameters);
int drawCalls = 0;
DrawBatch lastRendered = null;
for (int i = 0; i < batches.Count; i++)
{
DrawBatch batch = batches[i];
VertexDeclaration vertexType = batch.VertexBuffer.VertexType;
// Bind the vertex buffer we'll use. Note that this needs to be done
// before setting up any vertex format state.
NativeGraphicsBuffer vertexBuffer = batch.VertexBuffer.NativeVertex as NativeGraphicsBuffer;
NativeGraphicsBuffer.Bind(GraphicsBufferType.Vertex, vertexBuffer);
bool first = (i == 0);
bool sameMaterial =
lastRendered != null &&
lastRendered.Material.Equals(batch.Material);
// Setup vertex bindings. Note that the setup differs based on the
// materials shader, so material changes can be vertex binding changes.
if (lastRendered != null)
{
this.FinishVertexFormat(lastRendered.Material, lastRendered.VertexBuffer.VertexType);
}
this.SetupVertexFormat(batch.Material, vertexType);
// Setup material when changed.
if (!sameMaterial)
{
this.SetupMaterial(
batch.Material,
lastRendered != null ? lastRendered.Material : null);
}
// Draw the current batch
this.DrawVertexBatch(
batch.VertexBuffer,
batch.VertexRanges,
batch.VertexMode);
drawCalls++;
lastRendered = batch;
}
// Cleanup after rendering
NativeGraphicsBuffer.Bind(GraphicsBufferType.Vertex, null);
NativeGraphicsBuffer.Bind(GraphicsBufferType.Index, null);
if (lastRendered != null)
{
this.FinishMaterial(lastRendered.Material);
this.FinishVertexFormat(lastRendered.Material, lastRendered.VertexBuffer.VertexType);
}
if (this.renderStats != null)
{
this.renderStats.DrawCalls += drawCalls;
}
this.FinishSharedParameters();
}