public void BufferInstanceData(InstanceDataBuffer buffer)
{
using (buffer.Create( ))
{
foreach (var part in Parts)
{
var instanceDatas = GetInstancesOf(part).ToArray( );
buffer.AddInstances(part, instanceDatas.Select(u => u.worldMatrix));
}
}
}
public static extern void bgfx_set_instance_data_buffer(InstanceDataBuffer.NativeStruct* idb, ushort num);
static unsafe void RenderThread(Sample sample)
{
// initialize the renderer
Bgfx.Init();
Bgfx.Reset(sample.WindowWidth, sample.WindowHeight, ResetFlags.Vsync);
// enable debug text
Bgfx.SetDebugFeatures(DebugFeatures.DisplayText);
// set view 0 clear state
Bgfx.SetViewClear(0, ClearTargets.Color | ClearTargets.Depth, 0x303030ff);
// create vertex and index buffers
var vbh = Cube.CreateVertexBuffer();
var ibh = Cube.CreateIndexBuffer();
// load shaders
var program = ResourceLoader.LoadProgram("vs_instancing", "fs_instancing");
// start the frame clock
var clock = new Clock();
clock.Start();
// getting caps
var caps = Bgfx.GetCaps();
// main loop
while (sample.ProcessEvents(ResetFlags.Vsync))
{
// set view 0 viewport
Bgfx.SetViewRect(0, 0, 0, sample.WindowWidth, sample.WindowHeight);
// view transforms
var viewMatrix = Matrix4x4.CreateLookAt(new Vector3(0.0f, 0.0f, -35.0f), Vector3.Zero, Vector3.UnitY);
var projMatrix = Matrix4x4.CreatePerspectiveFieldOfView((float)Math.PI / 3, (float)sample.WindowWidth / sample.WindowHeight, 0.1f, 100.0f);
Bgfx.SetViewTransform(0, &viewMatrix.M11, &projMatrix.M11);
// make sure view 0 is cleared if no other draw calls are submitted
Bgfx.Touch(0);
// tick the clock
var elapsed = clock.Frame();
var time = clock.TotalTime();
// write some debug text
Bgfx.DebugTextClear();
Bgfx.DebugTextWrite(0, 1, DebugColor.White, DebugColor.Blue, "SharpBgfx/Samples/05-Instancing");
Bgfx.DebugTextWrite(0, 2, DebugColor.White, DebugColor.Cyan, "Description: Geometry instancing.");
Bgfx.DebugTextWrite(0, 3, DebugColor.White, DebugColor.Cyan, "Frame: {0:F3} ms", elapsed * 1000);
// check caps
if ((caps.SupportedFeatures & DeviceFeatures.Instancing) != DeviceFeatures.Instancing)
{
// instancing not supported
Bgfx.DebugTextWrite(0, 3, DebugColor.White, DebugColor.Red, "Instancing not supported!");
}
else
{
const int instanceStride = 80;
const int instanceCount = 121;
var idb = new InstanceDataBuffer(instanceCount, instanceStride);
// fill in InstanceDataBuffer
byte *dataPtr = (byte *)idb.Data.ToPointer();
// TODO: extract idb->data->num
for (int y = 0; y < 11; y++)
{
for (int x = 0; x < 11; x++)
{
float *matrix = (float *)dataPtr;
var realMatrix = Matrix4x4.CreateFromYawPitchRoll(time + x * 0.21f, time + y * 0.37f, 0f);
realMatrix.M41 = -15.0f + x * 3.0f;
realMatrix.M42 = -15.0f + y * 3.0f;
realMatrix.M43 = 0.0f;
// TODO: use proper copy function, not a bycicle
float *realMatrixPtr = &realMatrix.M11;
for (int i = 0; i < 16; i++)
{
matrix[i] = realMatrixPtr[i];
}
float *color = (float *)(dataPtr + 64);
color[0] = (float)Math.Sin(time + x / 11.0f) * 0.5f + 0.5f;
color[1] = (float)Math.Cos(time + y / 11.0f) * 0.5f + 0.5f;
color[2] = (float)Math.Sin(time * 3.0f) * 0.5f + 0.5f;
color[3] = 1.0f;
dataPtr += instanceStride;
}
}
// set pipeline states
Bgfx.SetVertexBuffer(0, vbh);
Bgfx.SetIndexBuffer(ibh);
Bgfx.SetInstanceDataBuffer(ref idb);
Bgfx.SetRenderState(RenderState.Default);
// submit primitives
Bgfx.Submit(0, program);
}
// advance to the next frame. Rendering thread will be kicked to
// process submitted rendering primitives.
Bgfx.Frame();
}
// clean up
ibh.Dispose();
vbh.Dispose();
program.Dispose();
Bgfx.Shutdown();
}
/// <summary>
/// Sets instance data to use for drawing primitives.
/// </summary>
/// <param name="instanceData">The instance data.</param>
/// <param name="count">The number of entries to pull from the buffer.</param>
public static void SetInstanceDataBuffer(InstanceDataBuffer instanceData, int count = -1)
{
NativeMethods.bgfx_set_instance_data_buffer(instanceData.ptr, (ushort)count);
}
