protected override void DoRender(RenderEventArgs arg)
{
float deltaTime = (float)random.NextDouble() * 5;
time += (float)random.NextDouble() * 5;
IntPtr attractors = this.attractorBuffer.MapBufferRange(
0, 64 * Marshal.SizeOf(typeof(vec4)),
MapBufferRangeAccess.MapWriteBit | MapBufferRangeAccess.MapInvalidateBufferBit);
unsafe
{
var array = (vec4 *)attractors.ToPointer();
for (int i = 0; i < 64; i++)
{
array[i] = new vec4(
(float)(Math.Sin(time)) * 50.0f,
(float)(Math.Cos(time)) * 50.0f,
(float)(Math.Cos(time)) * (float)(Math.Sin(time)) * 5.0f,
ParticleModel.attractor_masses[i]);
}
}
this.attractorBuffer.UnmapBuffer();
// Activate the compute program and bind the position and velocity buffers
computeProgram.Bind();
OpenGL.BindImageTexture(0, this.velocityTexture.Id, 0, false, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_RGBA32F);
OpenGL.BindImageTexture(1, this.positionTexture.Id, 0, false, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_RGBA32F);
// Set delta time
computeProgram.SetUniform("dt", deltaTime);
// Dispatch
OpenGL.GetDelegateFor <OpenGL.glDispatchCompute>()(ParticleModel.particleGroupCount, 1, 1);
}
protected override void DoRender(RenderEventArgs arg)
{
this.depthTestState.On();
this.cullFaceState.On();
// Reset atomic counter
IntPtr data = this.atomicCountBuffer.MapBuffer(MapBufferAccess.WriteOnly);
unsafe
{
var array = (uint *)data.ToPointer();
array[0] = 0;
}
this.atomicCountBuffer.UnmapBuffer();
// Clear head-pointer image
this.headClearBuffer.Bind();
this.headTexture.Bind();
OpenGL.TexSubImage2D(TexSubImage2DTarget.Texture2D, 0, 0, 0, arg.CanvasRect.Width, arg.CanvasRect.Height, TexSubImage2DFormats.RedInteger, TexSubImage2DType.UnsignedByte, IntPtr.Zero);
this.headTexture.Unbind();
this.headClearBuffer.Unbind();
//
// Bind head-pointer image for read-write
OpenGL.BindImageTexture(0, this.headTexture.Id, 0, false, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_R32UI);
// Bind linked-list buffer for write
OpenGL.BindImageTexture(1, this.linkedListTexture.Id, 0, false, 0, OpenGL.GL_WRITE_ONLY, OpenGL.GL_RGBA32UI);
mat4 projection = arg.Camera.GetProjectionMatrix();
mat4 view = arg.Camera.GetViewMatrix();
this.buildListsRenderer.SetUniform("projection_matrix", projection);
this.buildListsRenderer.SetUniform("view_matrix", view);
this.resolve_lists.SetUniform("projection_matrix", projection);
this.resolve_lists.SetUniform("view_matrix", view);
MarkableStruct <mat4> model = this.GetModelMatrix();
if (this.modelTicks != model.UpdateTicks)
{
this.buildListsRenderer.SetUniform("model_matrix", model.Value);
this.resolve_lists.SetUniform("model_matrix", model.Value);
this.modelTicks = model.UpdateTicks;
}
// first pass
this.buildListsRenderer.Render(arg);
// second pass
this.resolve_lists.Render(arg);
OpenGL.BindImageTexture(1, 0, 0, false, 0, OpenGL.GL_WRITE_ONLY, OpenGL.GL_RGBA32UI);
OpenGL.BindImageTexture(0, 0, 0, false, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_R32UI);
this.cullFaceState.Off();
this.depthTestState.Off();
}
protected override void DoInitialize()
{
this.buildListsRenderer.Initialize();
this.resolve_lists.Initialize();
{
var texture = new Texture(TextureTarget.Texture2D,
new NullImageFiller(MAX_FRAMEBUFFER_WIDTH, MAX_FRAMEBUFFER_HEIGHT, OpenGL.GL_R32UI, OpenGL.GL_RED_INTEGER, OpenGL.GL_UNSIGNED_BYTE),
new SamplerParameters(TextureWrapping.Repeat, TextureWrapping.Repeat, TextureWrapping.Repeat, TextureFilter.Nearest, TextureFilter.Nearest));
texture.Initialize();
this.headTexture = texture;
OpenGL.BindImageTexture(0, this.headTexture.Id, 0, true, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_R32UI);
}
// Create buffer for clearing the head pointer texture
//var buffer = new IndependentBuffer<uint>(BufferTarget.PixelUnpackBuffer, BufferUsage.StaticDraw, false);
using (var buffer = new PixelUnpackBuffer <uint>(BufferUsage.StaticDraw, false))
{
buffer.Create(MAX_FRAMEBUFFER_WIDTH * MAX_FRAMEBUFFER_HEIGHT);
// NOTE: not all initial values are zero in this unmanged array.
//unsafe
//{
// var array = (uint*)buffer.Header.ToPointer();
// for (int i = 0; i < MAX_FRAMEBUFFER_WIDTH * MAX_FRAMEBUFFER_HEIGHT; i++)
// {
// array[i] = 0;
// }
//}
this.headClearBufferPtr = buffer.GetBufferPtr() as PixelUnpackBufferPtr;
}
// Create the atomic counter buffer
using (var buffer = new AtomicCounterBuffer <uint>(BufferUsage.DynamicCopy, false))
{
buffer.Create(1);
this.atomicCountBufferPtr = buffer.GetBufferPtr() as AtomicCounterBufferPtr;
}
// Bind it to a texture (for use as a TBO)
using (var buffer = new TextureBuffer <vec4>(BufferUsage.DynamicCopy, noDataCopyed: false))
{
buffer.Create(elementCount: MAX_FRAMEBUFFER_WIDTH * MAX_FRAMEBUFFER_HEIGHT * 3);
IndependentBufferPtr bufferPtr = buffer.GetBufferPtr();
Texture texture = bufferPtr.DumpBufferTexture(OpenGL.GL_RGBA32UI, autoDispose: true);
texture.Initialize();
bufferPtr.Dispose();// dispose it ASAP.
this.linkedListTexture = texture;
}
{
OpenGL.BindImageTexture(1, this.linkedListTexture.Id, 0, false, 0, OpenGL.GL_WRITE_ONLY, OpenGL.GL_RGBA32UI);
}
OpenGL.ClearDepth(1.0f);
}
protected override void DoRender(RenderEventArgs arg)
{
// Activate the compute program and bind the output texture image
computeProgram.Bind();
OpenGL.BindImageTexture((uint)computeProgram.GetUniformLocation("input_image"), this.innerRenderer.InputTexture.Id, 0, false, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_RGBA32F);
OpenGL.BindImageTexture((uint)computeProgram.GetUniformLocation("output_image"), this.innerRenderer.IntermediateTexture.Id, 0, false, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_RGBA32F);
// Dispatch
OpenGL.GetDelegateFor <OpenGL.glDispatchCompute>()(1, 512, 1);
OpenGL.GetDelegateFor <OpenGL.glMemoryBarrier>()(OpenGL.GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);
computeProgram.Unbind();
computeProgram.Bind();
OpenGL.BindImageTexture((uint)computeProgram.GetUniformLocation("input_image"), this.innerRenderer.IntermediateTexture.Id, 0, false, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_RGBA32F);
OpenGL.BindImageTexture((uint)computeProgram.GetUniformLocation("output_image"), this.innerRenderer.OutputTexture.Id, 0, false, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_RGBA32F);
// Dispatch
OpenGL.GetDelegateFor <OpenGL.glDispatchCompute>()(1, 512, 1);
OpenGL.GetDelegateFor <OpenGL.glMemoryBarrier>()(OpenGL.GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);
computeProgram.Unbind();
}
protected override void DoRender(RenderEventArgs arg)
{
{
this.computeProgram.Bind();
// Also bind created texture ...
this.texture.Bind();
// ... and bind this texture as an image, as we will write to it. see binding = 0 in shader.
//glBindImageTexture(0, g_texture, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA8);
OpenGL.BindImageTexture(0, this.texture.Id, 0, false, 0, OpenGL.GL_WRITE_ONLY, OpenGL.GL_RGBA8);
//glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, g_directionSSBO);
OpenGL.BindBufferBase(BindBufferBaseTarget.ShaderStorageBuffer, 1, this.g_directionSSBO.BufferId);
//glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, g_positionSSBO);
OpenGL.BindBufferBase(BindBufferBaseTarget.ShaderStorageBuffer, 2, this.g_positionSSBO.BufferId);
//glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, g_stackSSBO);
OpenGL.BindBufferBase(BindBufferBaseTarget.ShaderStorageBuffer, 3, this.g_stackSSBO.BufferId);
//glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 4, g_sphereSSBO);
OpenGL.BindBufferBase(BindBufferBaseTarget.ShaderStorageBuffer, 4, this.g_sphereSSBO.BufferId);
//glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 5, g_pointLightSSBO);
OpenGL.BindBufferBase(BindBufferBaseTarget.ShaderStorageBuffer, 3, this.g_pointLightSSBO.BufferId);
}
{
//mat4 mvp = arg.Camera.GetProjectionMatrix() * arg.Camera.GetViewMatrix();
this.computeProgram.Bind();
OpenGL.GetDelegateFor <OpenGL.glDispatchCompute>()(WIDTH / g_localSize, HEIGHT / g_localSize, 1);
this.computeProgram.Unbind();
this.Program.Bind();
this.texture.Bind();
// ... and bind this texture as an image, as we will write to it. see binding = 0 in shader.
//glBindImageTexture(0, g_texture, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA8);
OpenGL.BindImageTexture(0, this.texture.Id, 0, false, 0, OpenGL.GL_WRITE_ONLY, OpenGL.GL_RGBA8);
mat4 mvp = arg.Camera.GetProjectionMatrix() * arg.Camera.GetViewMatrix();
this.SetUniform("mvp", mvp);
base.DoRender(arg);
}
}
protected override void DoRender(RenderEventArgs arg)
{
// reset image
computeResetProgram.Bind();
OpenGL.BindImageTexture(0, outputImage.Id, 0, false, 0, OpenGL.GL_WRITE_ONLY, OpenGL.GL_RGBA32F);
OpenGL.GetDelegateFor <OpenGL.glDispatchCompute>()(maxX, maxY, maxZ);
computeResetProgram.Unbind();
// Activate the compute program and bind the output texture image
computeProgram.Bind();
OpenGL.BindImageTexture(0, outputImage.Id, 0, false, 0, OpenGL.GL_WRITE_ONLY, OpenGL.GL_RGBA32F);
OpenGL.GetDelegateFor <OpenGL.glDispatchCompute>()(GroupX, GroupY, GroupZ);
computeProgram.Unbind();
mat4 model = mat4.identity();
mat4 view = arg.Camera.GetViewMatrix();
mat4 projection = arg.Camera.GetProjectionMatrix();
this.SetUniform("modelMatrix", model);
this.SetUniform("viewMatrix", view);
this.SetUniform("projectionMatrix", projection);
base.DoRender(arg);
}
protected override void DoInitialize()
{
this.buildListsRenderer.Initialize();
this.resolve_lists.Initialize();
{
var texture = new Texture(TextureTarget.Texture2D,
new NullImageFiller(MAX_FRAMEBUFFER_WIDTH, MAX_FRAMEBUFFER_HEIGHT, OpenGL.GL_R32UI, OpenGL.GL_RED_INTEGER, OpenGL.GL_UNSIGNED_BYTE),
new SamplerParameters(TextureWrapping.Repeat, TextureWrapping.Repeat, TextureWrapping.Repeat, TextureFilter.Nearest, TextureFilter.Nearest));
texture.Initialize();
this.headTexture = texture;
OpenGL.BindImageTexture(0, this.headTexture.Id, 0, true, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_R32UI);
}
// Create buffer for clearing the head pointer texture
{
const int length = MAX_FRAMEBUFFER_WIDTH * MAX_FRAMEBUFFER_HEIGHT;
PixelUnpackBuffer buffer = PixelUnpackBuffer.Create(typeof(uint), length, BufferUsage.StaticDraw);
// NOTE: not all initial values are zero in this unmanged array.
// initialize buffer's value to 0.
//unsafe
//{
// IntPtr pointer = ptr.MapBuffer(MapBufferAccess.WriteOnly);
// var array = (uint*)pointer.ToPointer();
// for (int i = 0; i < MAX_FRAMEBUFFER_WIDTH * MAX_FRAMEBUFFER_HEIGHT; i++)
// {
// array[i] = 0;
// }
//}
// another way to initialize buffer's value to 0.
//using (var data = new UnmanagedArray<uint>(1))
//{
// data[0] = 0;
// ptr.ClearBufferData(OpenGL.GL_UNSIGNED_INT, OpenGL.GL_RED, OpenGL.GL_UNSIGNED_INT, data);
//}
this.headClearBuffer = buffer;
}
// Create the atomic counter buffer
{
const int length = 1;
AtomicCounterBuffer buffer = AtomicCounterBuffer.Create(typeof(uint), length, BufferUsage.DynamicCopy);
// another way to do this:
//uint data = 1;
//AtomicCounterBuffer buffer = data.GenAtomicCounterBuffer(BufferUsage.DynamicCopy);
this.atomicCountBuffer = buffer;
}
// Bind it to a texture (for use as a TBO)
{
const int length = MAX_FRAMEBUFFER_WIDTH * MAX_FRAMEBUFFER_HEIGHT * 3;
TextureBuffer buffer = TextureBuffer.Create(typeof(vec4), length, BufferUsage.DynamicCopy);
Texture texture = buffer.DumpBufferTexture(OpenGL.GL_RGBA32UI, autoDispose: true);
texture.Initialize();
buffer.Dispose();// dispose it ASAP.
this.linkedListTexture = texture;
}
{
//TextureBuffer buffer = TextureBuffer.Create()
}
{
OpenGL.BindImageTexture(1, this.linkedListTexture.Id, 0, false, 0, OpenGL.GL_WRITE_ONLY, OpenGL.GL_RGBA32UI);
}
OpenGL.ClearDepth(1.0f);
}
