I'm writing some code that is drawing 2D sprites using D3D11 (SharpDX for WinRT apps). All of this is working, however it is not fast. Here's a bit of the code I'm using:
// Setup local variables
var d3dDevice = App.deviceManager.DeviceDirect3D;
var d3dContext = App.deviceManager.ContextDirect3D;
var vertices = SharpDX.Direct3D11.Buffer.Create(App.deviceManager.DeviceDirect3D, BindFlags.VertexBuffer, new[]
{
// Position Colour UV
x0 - OFFSET, y0 - OFFSET, 0.0f, 1.0f , 1.0f, 1.0f, 1.0f, 1.0f, u, v,
x1 - OFFSET, y1 - OFFSET, 0.0f, 1.0f , 1.0f, 1.0f, 1.0f, 1.0f, u2, v,
x3 - OFFSET, y3 - OFFSET, 0.0f, 1.0f , 1.0f, 1.0f, 1.0f, 1.0f, u, v2,
x2 - OFFSET, y2 - OFFSET, 0.0f, 1.0f , 1.0f, 1.0f, 1.0f, 1.0f, u2, v2,
});
textureView = new ShaderResourceView( App.deviceManager.DeviceDirect3D, texture );
// Setup the pipeline
d3dContext.InputAssembler.SetVertexBuffers( 0, vertexBufferBinding );
d3dContext.InputAssembler.InputLayout = layout;
d3dContext.InputAssembler.PrimitiveTopology = PrimitiveTopology.TriangleStrip;
d3dContext.VertexShader.SetConstantBuffer( 0, constantBuffer );
d3dContext.VertexShader.Set( vertexShader );
d3dContext.PixelShader.Set( pixelShader );
if( textureView != null )
d3dContext.PixelShader.SetShaderResource( 0, textureView );
// Draw the quad
d3dContext.Draw( 4, 0 );
This code is called for every sprite rendered on screen. I can not guarantee the life of each sprite. They could be in the same position next frame or a different position. There could be more, there could be less. According to my profiler, SharpDX.Direct3D11.Buffer.Create is taking 50% of the entire frame when rendering a lot of sprites. I assume there is a better way to do this but I'm struggling to get my head around what to do. Can anyone offer any suggestions for this?
