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jeanlemotan
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#include "IUI/ImGuiFilamentBridge.h"
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#include <utils/EntityManager.h>
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#include <tl/vector.h>
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#include "IUI/ImGui/imgui.h"
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#include <filamat/MaterialBuilder.h>
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#include <filament/IndexBuffer.h>
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#include <filament/Material.h>
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#include <filament/MaterialInstance.h>
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#include <filament/RenderableManager.h>
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#include <filament/Scene.h>
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#include <filament/Texture.h>
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#include <filament/TextureSampler.h>
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#include <filament/VertexBuffer.h>
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#include <Kit/EngineManager.h>
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#include "tl/narrow_cast.h"
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using namespace filament::math;
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using namespace filament;
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using namespace utils;
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namespace kit
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{
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static constexpr uint8_t IMGUI_PACKAGE[] =
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{
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// ReSharper disable All
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#include "Materials/ImGuiMaterial.h"
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// ReSharper restore All
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};
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ImGuiFilamentBridge::ImGuiFilamentBridge(tl::lent_ref<EngineManager> engineManager, tl::lent_ref<filament::Scene> flmScene)
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: m_engineManager(std::move(engineManager))
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, m_scene(std::move(flmScene))
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{
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// Create a simple alpha-blended 2D blitting material.
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auto builder = Material::Builder()
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.package(IMGUI_PACKAGE, sizeof(IMGUI_PACKAGE));
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m_material = m_engineManager->adopt(builder.build(*m_engineManager->getEngine()));
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EntityManager& em = utils::EntityManager::get();
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m_renderable = em.create();
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m_scene->addEntity(m_renderable);
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}
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ImTextureID ImGuiFilamentBridge::createAtlasTexture()
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{
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const ImGuiIO& io = ImGui::GetIO();
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// Create the grayscale texture that ImGui uses for its glyph atlas.
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unsigned char* pixels;
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int width, height;
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io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
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const size_t size = tl::narrow<size_t>(width * height * 4);
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uint8_t* buffer = m_engineManager->acquireUploadMemory(size);
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memcpy(buffer, pixels, size);
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auto builder = Texture::Builder()
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.width(tl::narrow<uint32_t>(width))
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.height(tl::narrow<uint32_t>(height))
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.levels(tl::narrow<uint8_t>(1))
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.format(Texture::InternalFormat::RGBA8)
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.sampler(Texture::Sampler::SAMPLER_2D);
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m_texture = m_engineManager->adopt(builder.build(*m_engineManager->getEngine()));
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m_texture->setImage(*m_engineManager->getEngine(), 0, Texture::PixelBufferDescriptor(buffer, size, Texture::Format::RGBA, Texture::Type::UBYTE));
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const TextureSampler sampler(TextureSampler::MinFilter::LINEAR_MIPMAP_LINEAR, TextureSampler::MagFilter::LINEAR);
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m_material->setDefaultParameter("albedo", m_texture.get(), sampler);
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for (const auto& mi : m_materialInstances)
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mi->setParameter("albedo", m_texture.get(), sampler);
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return m_texture.get();
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}
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ImGuiFilamentBridge::~ImGuiFilamentBridge()
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{
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m_engineManager->destroy(m_renderable);
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}
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//void ImGuiFilamentBridge::setDisplaySize(int width, int height, float scaleX, float scaleY)
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//{
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// setContext();
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// ImGuiIO& io = ImGui::GetIO();
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// io.DisplaySize = ImVec2((float)width, (float)height);
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// io.DisplayFramebufferScale.x = scaleX;
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// io.DisplayFramebufferScale.y = scaleY;
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//}
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void ImGuiFilamentBridge::processImGuiCommands(ImDrawData& commands, const ImGuiIO& io)
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{
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auto& rcm = m_engineManager->getEngine()->getRenderableManager();
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// Avoid rendering when minimized and scale coordinates for retina displays.
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const int fbwidth = static_cast<int>(commands.DisplaySize.x * commands.FramebufferScale.x);
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const int fbheight = static_cast<int>(commands.DisplaySize.y * commands.FramebufferScale.y);
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if (fbwidth == 0 || fbheight == 0)
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return;
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//commands.ScaleClipRects(commands.FramebufferScale);
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// Ensure that we have enough vertex buffers and index buffers.
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createBuffers(commands.CmdListsCount);
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// Count how many primitives we'll need, then create a Renderable builder.
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size_t primitiveCount = 0;
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//tl::unordered_map<uint64_t, filament::MaterialInstance*> scissorRects;
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for (int cmdListIndex = 0; cmdListIndex < commands.CmdListsCount; cmdListIndex++)
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{
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const ImDrawList* cmds = commands.CmdLists[cmdListIndex];
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primitiveCount += cmds->CmdBuffer.size();
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}
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auto rbuilder = RenderableManager::Builder(primitiveCount);
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rbuilder.boundingBox({{0, 0, 0}, {10000, 10000, 10000}}).culling(false);
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// Ensure that we have a material instance for each primitive.
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const size_t previousSize = m_materialInstances.size();
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if (primitiveCount > m_materialInstances.size())
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{
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//m_materialInstances.resize(primitiveCount);
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for (size_t i = previousSize; i < primitiveCount; i++)
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m_materialInstances.push_back(m_engineManager->adopt(m_material->createInstance()));
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}
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const ImVec2 clipOff = commands.DisplayPos; // (0,0) unless using multi-viewports
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const ImVec2 clipScale = commands.FramebufferScale; // (1,1) unless using retina display which are often (2,2)
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// Recreate the Renderable component and point it to the vertex buffers.
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rcm.destroy(m_renderable);
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size_t bufferIndex = 0;
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size_t primIndex = 0;
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for (int cmdListIndex = 0; cmdListIndex < commands.CmdListsCount; cmdListIndex++)
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{
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const ImDrawList* cmds = commands.CmdLists[cmdListIndex];
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size_t indexOffset = 0;
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populateVertexData(bufferIndex,
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cmds->VtxBuffer.Size * sizeof(ImDrawVert),
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cmds->VtxBuffer.Data,
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cmds->IdxBuffer.Size * sizeof(ImDrawIdx),
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cmds->IdxBuffer.Data);
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for (const auto& pcmd : cmds->CmdBuffer)
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{
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if (pcmd.UserCallback)
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pcmd.UserCallback(cmds, &pcmd);
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else
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{
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MaterialInstance& materialInstance = *m_materialInstances[primIndex];
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// Project scissor/clipping rectangles into framebuffer space
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const ImVec2 clipMin((pcmd.ClipRect.x - clipOff.x) * clipScale.x, (pcmd.ClipRect.y - clipOff.y) * clipScale.y);
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const ImVec2 clipMax((pcmd.ClipRect.z - clipOff.x) * clipScale.x, (pcmd.ClipRect.w - clipOff.y) * clipScale.y);
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materialInstance.setScissor(uint32_t(clipMin.x),
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uint32_t(fbheight - clipMax.y),
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(uint16_t)(clipMax.x - clipMin.x),
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(uint16_t)(clipMax.y - clipMin.y));
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TextureSampler sampler(TextureSampler::MinFilter::LINEAR_MIPMAP_LINEAR, TextureSampler::MagFilter::LINEAR);
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if (pcmd.TextureId)
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materialInstance.setParameter("albedo", (Texture const*)pcmd.TextureId, sampler);
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else
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materialInstance.setParameter("albedo", m_texture.get(), sampler);
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rbuilder
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.geometry(primIndex,
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RenderableManager::PrimitiveType::TRIANGLES,
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m_vertexBuffers[bufferIndex].get(),
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m_indexBuffers[bufferIndex].get(),
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indexOffset,
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pcmd.ElemCount)
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.blendOrder(primIndex, tl::narrow<uint16_t>(primIndex))
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.material(primIndex, &materialInstance);
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primIndex++;
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}
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indexOffset += pcmd.ElemCount;
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}
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bufferIndex++;
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}
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if (commands.CmdListsCount > 0)
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rbuilder.build(*m_engineManager->getEngine(), m_renderable);
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}
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tl::unique_ref<filament::VertexBuffer> ImGuiFilamentBridge::createVertexBuffer(size_t capacity) const
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{
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auto builder = VertexBuffer::Builder()
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.vertexCount(uint32_t(capacity))
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.bufferCount(1)
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.attribute(VertexAttribute::POSITION,
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0,
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VertexBuffer::AttributeType::FLOAT2,
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0,
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sizeof(ImDrawVert))
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.attribute(VertexAttribute::UV0,
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0,
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VertexBuffer::AttributeType::FLOAT2,
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sizeof(filament::math::float2),
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sizeof(ImDrawVert))
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.attribute(VertexAttribute::COLOR,
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0,
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VertexBuffer::AttributeType::UBYTE4,
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2 * sizeof(filament::math::float2),
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sizeof(ImDrawVert))
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.normalized(COLOR);
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return m_engineManager->adopt(builder.build(*m_engineManager->getEngine()));
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}
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tl::unique_ref<filament::IndexBuffer> ImGuiFilamentBridge::createIndexBuffer(size_t capacity) const
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{
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auto builder = IndexBuffer::Builder()
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.indexCount(uint32_t(capacity))
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.bufferType(IndexBuffer::IndexType::UINT);
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return m_engineManager->adopt(builder.build(*m_engineManager->getEngine()));
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}
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void ImGuiFilamentBridge::createBuffers(int numRequiredBuffers)
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{
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if (numRequiredBuffers > m_vertexBuffers.size())
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{
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const size_t previousSize = m_vertexBuffers.size();
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for (size_t i = previousSize; i < numRequiredBuffers; i++)
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{
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// Pick a reasonable starting capacity; it will grow if needed.
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m_vertexBuffers.push_back(createVertexBuffer(1000));
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}
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}
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if (numRequiredBuffers > m_indexBuffers.size())
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{
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const size_t previousSize = m_indexBuffers.size();
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for (size_t i = previousSize; i < numRequiredBuffers; i++)
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{
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// Pick a reasonable starting capacity; it will grow if needed.
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m_indexBuffers.push_back(createIndexBuffer(1000));
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}
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}
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}
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void ImGuiFilamentBridge::populateVertexData(size_t bufferIndex, size_t vbSizeInBytes, void* vbImguiData, size_t ibSizeInBytes, void* ibImguiData)
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{
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// Create a new vertex buffer if the size isn't large enough, then copy the ImGui data into
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// a staging area since Filament's render thread might consume the data at any time.
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const size_t requiredVertCount = vbSizeInBytes / sizeof(ImDrawVert);
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const size_t capacityVertCount = m_vertexBuffers[bufferIndex]->getVertexCount();
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if (requiredVertCount > capacityVertCount)
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m_vertexBuffers[bufferIndex] = createVertexBuffer(requiredVertCount);
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{
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const size_t nVbBytes = requiredVertCount * sizeof(ImDrawVert);
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uint8_t* vbFilamentData = m_engineManager->acquireUploadMemory(nVbBytes);
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memcpy(vbFilamentData, vbImguiData, nVbBytes);
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m_vertexBuffers[bufferIndex]->setBufferAt(*m_engineManager->getEngine(), 0, VertexBuffer::BufferDescriptor(vbFilamentData, nVbBytes));
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}
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// Create a new index buffer if the size isn't large enough, then copy the ImGui data into
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// a staging area since Filament's render thread might consume the data at any time.
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const size_t requiredIndexCount = ibSizeInBytes / sizeof(ImDrawIdx);
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const size_t capacityIndexCount = m_indexBuffers[bufferIndex]->getIndexCount();
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if (requiredIndexCount > capacityIndexCount)
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m_indexBuffers[bufferIndex] = createIndexBuffer(requiredIndexCount);
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{
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const size_t nIbBytes = requiredIndexCount * sizeof(ImDrawIdx);
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uint8_t* ibFilamentData = m_engineManager->acquireUploadMemory(nIbBytes);
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memcpy(ibFilamentData, ibImguiData, nIbBytes);
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m_indexBuffers[bufferIndex]->setBuffer(*m_engineManager->getEngine(), IndexBuffer::BufferDescriptor(ibFilamentData, nIbBytes));
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}
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}
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} // namespace filagui
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