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Use a dedicated swap chain for offscreen rendering.

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PiperOrigin-RevId: 856320260
Change-Id: I3076827baf075282651e4308db74b163a5709935
This commit is contained in:
Haroon Qureshi
2026-01-14 12:30:56 -08:00
committed by Copybara-Service
parent e56b31e98f
commit 42c565d860
2 changed files with 8 additions and 4 deletions
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src/experimental/filament/filament/filament_context.cc
+7 -4
View File
@@ -69,6 +69,9 @@ FilamentContext::FilamentContext(const mjrFilamentConfig* config,
mju_error("Unsupported graphics API: %d", config_.graphics_api); mju_error("Unsupported graphics API: %d", config_.graphics_api);
} }
const int width = model_->vis.global.offwidth;
const int height = model_->vis.global.offheight;
engine_ = filament::Engine::create(backend); engine_ = filament::Engine::create(backend);
renderer_ = engine_->createRenderer(); renderer_ = engine_->createRenderer();
#ifdef __EMSCRIPTEN__ #ifdef __EMSCRIPTEN__
@@ -77,12 +80,11 @@ FilamentContext::FilamentContext(const mjrFilamentConfig* config,
if (config_.native_window) { if (config_.native_window) {
swap_chain_ = engine_->createSwapChain(config_.native_window); swap_chain_ = engine_->createSwapChain(config_.native_window);
} else { } else {
const int width = model_->vis.global.offwidth;
const int height = model_->vis.global.offheight;
swap_chain_ = engine_->createSwapChain(width, height); swap_chain_ = engine_->createSwapChain(width, height);
} }
#endif #endif
offscreen_swap_chain_ = engine_->createSwapChain(width, height);
object_manager_ = std::make_unique<ObjectManager>(model, engine_, config); object_manager_ = std::make_unique<ObjectManager>(model, engine_, config);
// Set clear options. // Set clear options.
@@ -128,6 +130,7 @@ FilamentContext::~FilamentContext() {
object_manager_.reset(); object_manager_.reset();
engine_->destroy(renderer_); engine_->destroy(renderer_);
engine_->destroy(swap_chain_); engine_->destroy(swap_chain_);
engine_->destroy(offscreen_swap_chain_);
filament::Engine::destroy(engine_); filament::Engine::destroy(engine_);
} }
@@ -266,7 +269,7 @@ void FilamentContext::ReadPixels(mjrRect viewport, unsigned char* rgb,
if (rgb) { if (rgb) {
filament::View* view = filament::View* view =
scene_view_->PrepareRenderView(last_render_mode_); scene_view_->PrepareRenderView(last_render_mode_);
if (renderer_->beginFrame(swap_chain_)) { if (renderer_->beginFrame(offscreen_swap_chain_)) {
// We need to disable msaa in order to render to texture. // We need to disable msaa in order to render to texture.
auto options = view->getMultiSampleAntiAliasingOptions(); auto options = view->getMultiSampleAntiAliasingOptions();
view->setMultiSampleAntiAliasingOptions({ view->setMultiSampleAntiAliasingOptions({
@@ -287,7 +290,7 @@ void FilamentContext::ReadPixels(mjrRect viewport, unsigned char* rgb,
if (depth) { if (depth) {
filament::View* view = filament::View* view =
scene_view_->PrepareRenderView(SceneView::DrawMode::kDepth); scene_view_->PrepareRenderView(SceneView::DrawMode::kDepth);
if (renderer_->beginFrame(swap_chain_)) { if (renderer_->beginFrame(offscreen_swap_chain_)) {
view->setRenderTarget(depth_target_); view->setRenderTarget(depth_target_);
renderer_->render(view); renderer_->render(view);
src/experimental/filament/filament/filament_context.h
+1
View File
@@ -70,6 +70,7 @@ class FilamentContext {
const mjModel* model_ = nullptr; const mjModel* model_ = nullptr;
filament::Engine* engine_ = nullptr; filament::Engine* engine_ = nullptr;
filament::SwapChain* swap_chain_ = nullptr; filament::SwapChain* swap_chain_ = nullptr;
filament::SwapChain* offscreen_swap_chain_ = nullptr;
filament::Renderer* renderer_ = nullptr; filament::Renderer* renderer_ = nullptr;
filament::RenderTarget* color_target_ = nullptr; filament::RenderTarget* color_target_ = nullptr;
filament::RenderTarget* depth_target_ = nullptr; filament::RenderTarget* depth_target_ = nullptr;