public void SetInstanceDataBuffer(GpuVertexBuffer buffer, int startVertex /*= 0*/, int count /*= -1*/) { if (buffer.Flags.HasFlag(GpuBufferFlags.Dynamic) || buffer.Flags.HasFlag(GpuBufferFlags.ComputeWrite)) { Bgfx.SetInstanceDataBuffer((DynamicVertexBuffer)buffer.GetNativeObject(), startVertex, count); } else { Bgfx.SetInstanceDataBuffer((VertexBuffer)buffer.GetNativeObject(), startVertex, count); } }
static unsafe void RunCompute(Sample sample, bool indirectSupported) { // build vertex layouts var quadLayout = new VertexLayout(); quadLayout.Begin() .Add(VertexAttributeUsage.Position, 2, VertexAttributeType.Float) .End(); var computeLayout = new VertexLayout(); computeLayout.Begin() .Add(VertexAttributeUsage.TexCoord0, 4, VertexAttributeType.Float) .End(); // static quad data var vb = new VertexBuffer(MemoryBlock.FromArray(QuadVertices), quadLayout); var ib = new IndexBuffer(MemoryBlock.FromArray(QuadIndices)); // create compute buffers var currPositionBuffer0 = new DynamicVertexBuffer(1 << 15, computeLayout, BufferFlags.ComputeReadWrite); var currPositionBuffer1 = new DynamicVertexBuffer(1 << 15, computeLayout, BufferFlags.ComputeReadWrite); var prevPositionBuffer0 = new DynamicVertexBuffer(1 << 15, computeLayout, BufferFlags.ComputeReadWrite); var prevPositionBuffer1 = new DynamicVertexBuffer(1 << 15, computeLayout, BufferFlags.ComputeReadWrite); // load shaders var particleProgram = ResourceLoader.LoadProgram("vs_particle", "fs_particle"); var initInstancesProgram = ResourceLoader.LoadProgram("cs_init_instances"); var updateInstancesProgram = ResourceLoader.LoadProgram("cs_update_instances"); // indirect rendering support var indirectProgram = SharpBgfx.Program.Invalid; var indirectBuffer = IndirectBuffer.Invalid; bool useIndirect = false; if (indirectSupported) { indirectProgram = ResourceLoader.LoadProgram("cs_indirect"); indirectBuffer = new IndirectBuffer(2); useIndirect = true; } // setup params uniforms var paramData = new ParamsData { TimeStep = 0.0157f, DispatchSize = 32, Gravity = 0.109f, Damping = 0.25f, ParticleIntensity = 0.64f, ParticleSize = 0.279f, BaseSeed = 57, ParticlePower = 3.5f, InitialSpeed = 3.2f, InitialShape = 1, MaxAccel = 100.0f }; // have the compute shader run initialization var u_params = new Uniform("u_params", UniformType.Vector4, 3); Bgfx.SetUniform(u_params, ¶mData, 3); Bgfx.SetComputeBuffer(0, prevPositionBuffer0, ComputeBufferAccess.Write); Bgfx.SetComputeBuffer(1, currPositionBuffer0, ComputeBufferAccess.Write); Bgfx.Dispatch(0, initInstancesProgram, MaxParticleCount / ThreadGroupUpdateSize); // start the frame clock var clock = new Clock(); clock.Start(); // main loop while (sample.ProcessEvents(ResetFlags.Vsync)) { // 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/24-NBody"); Bgfx.DebugTextWrite(0, 2, DebugColor.White, DebugColor.Cyan, "Description: N-body simulation with compute shaders using buffers."); Bgfx.DebugTextWrite(0, 3, DebugColor.White, DebugColor.Cyan, "Frame: {0:F3} ms", elapsed * 1000); // fill the indirect buffer if we're using it if (useIndirect) { Bgfx.SetUniform(u_params, ¶mData, 3); Bgfx.SetComputeBuffer(0, indirectBuffer, ComputeBufferAccess.Write); Bgfx.Dispatch(0, indirectProgram); } // update particle positions Bgfx.SetComputeBuffer(0, prevPositionBuffer0, ComputeBufferAccess.Read); Bgfx.SetComputeBuffer(1, currPositionBuffer0, ComputeBufferAccess.Read); Bgfx.SetComputeBuffer(2, prevPositionBuffer1, ComputeBufferAccess.Write); Bgfx.SetComputeBuffer(3, currPositionBuffer1, ComputeBufferAccess.Write); Bgfx.SetUniform(u_params, ¶mData, 3); if (useIndirect) { Bgfx.Dispatch(0, updateInstancesProgram, indirectBuffer, 1); } else { Bgfx.Dispatch(0, updateInstancesProgram, paramData.DispatchSize); } // ping-pong the buffers for next frame Swap(ref currPositionBuffer0, ref currPositionBuffer1); Swap(ref prevPositionBuffer0, ref prevPositionBuffer1); // view transforms for particle rendering var viewMatrix = Matrix4x4.CreateLookAt(new Vector3(0.0f, 0.0f, -45.0f), -Vector3.UnitZ, Vector3.UnitY); var projMatrix = Matrix4x4.CreatePerspectiveFieldOfView((float)Math.PI / 4, (float)sample.WindowWidth / sample.WindowHeight, 0.1f, 10000.0f); Bgfx.SetViewTransform(0, &viewMatrix.M11, &projMatrix.M11); Bgfx.SetViewRect(0, 0, 0, sample.WindowWidth, sample.WindowHeight); // draw the particles Bgfx.SetVertexBuffer(vb); Bgfx.SetIndexBuffer(ib); Bgfx.SetInstanceDataBuffer(currPositionBuffer0, 0, paramData.DispatchSize * ThreadGroupUpdateSize); Bgfx.SetRenderState(RenderState.ColorWrite | RenderState.BlendAdd | RenderState.DepthTestAlways); if (useIndirect) { Bgfx.Submit(0, particleProgram, indirectBuffer); } else { Bgfx.Submit(0, particleProgram); } // done with frame Bgfx.Frame(); } // cleanup if (indirectSupported) { indirectProgram.Dispose(); indirectBuffer.Dispose(); } u_params.Dispose(); currPositionBuffer0.Dispose(); currPositionBuffer1.Dispose(); prevPositionBuffer0.Dispose(); prevPositionBuffer1.Dispose(); updateInstancesProgram.Dispose(); initInstancesProgram.Dispose(); particleProgram.Dispose(); ib.Dispose(); vb.Dispose(); }
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(); }