Use viewport instead of width/height.

PiperOrigin-RevId: 911942457
Change-Id: I2d6d52a8bb6b1b10d69956cce9e5d7f62e7d1f1c

src/experimental/filament/compat/mjr_filament_renderer.cc

@@ -54,15 +54,13 @@ void MjrFilamentRenderer::Render(const mjrRect& viewport,
     reqs[0].scene = scene_bridge_->GetScene();
     reqs[0].draw_mode = scene_bridge_->GetDrawMode();
     reqs[0].camera = scene_bridge_->GetCamera();
-    reqs[0].width = viewport.width;
-    reqs[0].height = viewport.height;
+    reqs[0].viewport = viewport;
 
     mjr_defaultRenderRequest(&reqs[1]);
     reqs[1].scene = imgui_bridge_->GetScene();
     reqs[1].draw_mode = mjDRAW_MODE_COLOR;
     reqs[1].camera = imgui_bridge_->GetCamera(viewport.width, viewport.height);
-    reqs[1].width = viewport.width;
-    reqs[1].height = viewport.height;
+    reqs[1].viewport = viewport;
     filament_context_->Render(reqs);
   }
 }
@@ -95,15 +93,13 @@ void MjrFilamentRenderer::ReadPixels(mjrRect viewport, unsigned char* rgb,
   reqs[0].scene = scene_bridge_->GetScene();
   reqs[0].draw_mode = scene_bridge_->GetDrawMode();
   reqs[0].camera = scene_bridge_->GetCamera();
-  reqs[0].width = viewport.width;
-  reqs[0].height = viewport.height;
+  reqs[0].viewport = viewport;
 
   mjr_defaultRenderRequest(&reqs[1]);
   reqs[1].scene = imgui_bridge_->GetScene();
   reqs[1].draw_mode = mjDRAW_MODE_COLOR;
   reqs[1].camera = imgui_bridge_->GetCamera(viewport.width, viewport.height);
-  reqs[1].width = viewport.width;
-  reqs[1].height = viewport.height;
+  reqs[1].viewport = viewport;
 
   if (rgb) {
     mjrRenderTargetConfig config;

src/experimental/filament/filament/filament_context.cc

@@ -110,13 +110,14 @@ mjrFrameHandle FilamentContext::Render(
       }
 
       // If the window size has changed, we need to reacquire the swap chain.
-      if (request.width != window_width_ || request.height != window_height_) {
+      if (request.viewport.width != window_width_ ||
+          request.viewport.height != window_height_) {
         if (window_width_ != 0 && window_height_ != 0) {
           engine_->destroy(window_swap_chain_);
           window_swap_chain_ = engine_->createSwapChain(config_.native_window);
         }
-        window_width_ = request.width;
-        window_height_ = request.height;
+        window_width_ = request.viewport.width;
+        window_height_ = request.viewport.height;
       }
 
       if (!render_began) {

src/experimental/filament/filament/scene_view.cc

@@ -486,7 +486,7 @@ void SceneView::Configure(const mjModel* model) {
 void DoRender(filament::Renderer* renderer, const mjrRenderRequest& request) {
   SceneView::RenderRequest scene_view_request;
   scene_view_request.draw_mode = request.draw_mode;
-  scene_view_request.viewport = {0, 0, request.width, request.height};
+  scene_view_request.viewport = request.viewport;
   scene_view_request.camera = request.camera;
   SceneView* scene_view = SceneView::downcast(request.scene);
   scene_view->Render(renderer, scene_view_request);
@@ -499,7 +499,7 @@ void DoReadPixels(filament::Renderer* renderer,
 
   SceneView::RenderRequest scene_view_request;
   scene_view_request.draw_mode = request.draw_mode;
-  scene_view_request.viewport = {0, 0, request.width, request.height};
+  scene_view_request.viewport = request.viewport;
   scene_view_request.camera = request.camera;
   scene_view_request.target = render_target;
   SceneView* scene_view = SceneView::downcast(request.scene);

src/experimental/filament/render_context_filament.h

@@ -370,9 +370,8 @@ struct mjrRenderRequest {
   // The camera from which to render the scene.
   mjrCamera camera;
 
-  // The dimensions of the output image.
-  int width;
-  int height;
+  // The viewport into which to render the image.
+  mjrRect viewport;
 
   // The render target into which to render the image. If nullptr, the image
   // will be rendered to the window (as previously configured in