/// <summary>
/// Begins text rendering (swaps and maps the vertex buffer to write to).
/// </summary>
/// <param name="graphicsContext">The current GraphicsContext.</param>
public void End([NotNull] GraphicsContext graphicsContext)
{
if (graphicsContext == null)
{
throw new ArgumentNullException(nameof(graphicsContext));
}
// Reallocate buffers if max number of characters is exceeded
if (charsToRenderCount > maxCharacterCount)
{
maxCharacterCount = (int)(1.5f * charsToRenderCount);
Initialize(graphicsContext, maxCharacterCount);
}
// Set the rendering parameters
simpleEffect.Parameters.Set(TexturingKeys.Texture0, DebugSpriteFont);
simpleEffect.Parameters.Set(SpriteEffectKeys.Color, TextColor);
simpleEffect.Parameters.Set(SpriteBaseKeys.MatrixTransform, MatrixTransform);
// Swap vertex buffer
activeVertexBufferIndex = ++activeVertexBufferIndex >= VertexBufferCount ? 0 : activeVertexBufferIndex;
// Map the vertex buffer to write to
mappedVertexBuffer = graphicsContext.CommandList.MapSubresource(vertexBuffers[activeVertexBufferIndex], 0, MapMode.WriteDiscard);
mappedVertexBufferPointer = mappedVertexBuffer.DataBox.DataPointer;
unsafe
{
// Clear buffer first (because of the buffer mapping mode used)
Utilities.ClearMemory(mappedVertexBufferPointer, 0x0, VertexBufferLength * sizeof(VertexPositionNormalTexture));
charsToRenderCount = 0;
//Draw the strings
var constantInfos = new RectangleF(GlyphWidth, GlyphHeight, DebugSpriteWidth, DebugSpriteHeight);
foreach (var textInfo in stringsToDraw)
{
var textLength = textInfo.Text.Length;
var textLengthPointer = new IntPtr(&textLength);
Native.NativeInvoke.xnGraphicsFastTextRendererGenerateVertices(constantInfos, textInfo.RenderingInfo, textInfo.Text, out textLengthPointer, out mappedVertexBufferPointer);
charsToRenderCount += *(int *)textLengthPointer.ToPointer();
}
}
// Unmap the vertex buffer
graphicsContext.CommandList.UnmapSubresource(mappedVertexBuffer);
mappedVertexBufferPointer = IntPtr.Zero;
// Update pipeline state
pipelineState.State.SetDefaults();
pipelineState.State.RootSignature = simpleEffect.RootSignature;
pipelineState.State.EffectBytecode = simpleEffect.Effect.Bytecode;
pipelineState.State.DepthStencilState = DepthStencilStates.None;
pipelineState.State.BlendState = BlendStates.AlphaBlend;
pipelineState.State.Output.CaptureState(graphicsContext.CommandList);
pipelineState.State.InputElements = inputElementDescriptions[activeVertexBufferIndex];
pipelineState.Update();
graphicsContext.CommandList.SetPipelineState(pipelineState.CurrentState);
// Update effect
simpleEffect.UpdateEffect(graphicsContext.CommandList.GraphicsDevice);
simpleEffect.Apply(graphicsContext);
// Bind and draw
graphicsContext.CommandList.SetVertexBuffer(0, vertexBuffersBinding[activeVertexBufferIndex].Buffer, vertexBuffersBinding[activeVertexBufferIndex].Offset, vertexBuffersBinding[activeVertexBufferIndex].Stride);
graphicsContext.CommandList.SetIndexBuffer(indexBufferBinding.Buffer, 0, indexBufferBinding.Is32Bit);
graphicsContext.CommandList.DrawIndexed(charsToRenderCount * 6);
}
