Removed unused font uploading functionality.

Font textures are handled directly through ImGui.

PiperOrigin-RevId: 840259537
Change-Id: I5b6b0dc5d2c1c7066b4a23f0106de34285f40e6c

src/experimental/filament/filament/filament_context.cc

@@ -314,11 +314,6 @@ void FilamentContext::UploadHeightField(const mjModel* model, int id) {
   object_manager_->UploadHeightField(model, id);
 }
 
-void FilamentContext::UploadFont(const uint8_t* pixels, int width, int height,
-                                 int id) {
-  object_manager_->UploadFont(pixels, width, height, id);
-}
-
 double FilamentContext::GetFrameRate() const {
   utils::FixedCapacityVector<filament::Renderer::FrameInfo> frame_info =
       renderer_->getFrameInfoHistory(1);

src/experimental/filament/filament/filament_context.h

@@ -51,8 +51,6 @@ class FilamentContext {
 
   void UploadHeightField(const mjModel* model, int id);
 
-  void UploadFont(const uint8_t* pixels, int width, int height, int id);
-
   double GetFrameRate() const;
 
   FilamentContext(const FilamentContext&) = delete;

src/experimental/filament/filament/object_manager.cc

@@ -158,9 +158,6 @@ ObjectManager::~ObjectManager() {
   engine_->destroy(fallback_black_);
   engine_->destroy(fallback_normal_);
   engine_->destroy(fallback_orm_);
-  for (auto& iter : fonts_) {
-    engine_->destroy(iter.second);
-  }
 }
 
 void ObjectManager::UploadMesh(const mjModel* model, int id) {
@@ -244,14 +241,6 @@ void ObjectManager::UploadHeightField(const mjModel* model, int id) {
       CreateIndexBuffer(engine_, model, id, MeshType::kHeightField);
 }
 
-void ObjectManager::UploadFont(const uint8_t* pixels, int width, int height,
-                               int id) {
-  if (auto iter = fonts_.find(id); iter != fonts_.end()) {
-    engine_->destroy(iter->second);
-  }
-  fonts_[id] = Create2dTexture(engine_, width, height, 4, pixels, false);
-}
-
 filament::Material* ObjectManager::GetMaterial(MaterialType type) const {
   if (type < 0 || type >= kNumMaterials) {
     mju_error("Invalid material type: %d", type);
@@ -286,11 +275,6 @@ const FilamentBuffers* ObjectManager::GetShapeBuffer(ShapeType shape) const {
   return &shapes_[shape];
 }
 
-const filament::Texture* ObjectManager::GetFont(int font_id) const {
-  auto it = fonts_.find(font_id);
-  return it != fonts_.end() ? it->second : nullptr;
-}
-
 const filament::Texture* ObjectManager::GetTexture(int tex_id) const {
   auto it = textures_.find(tex_id);
   return it != textures_.end() ? it->second : nullptr;

src/experimental/filament/filament/object_manager.h

@@ -78,8 +78,6 @@ class ObjectManager {
 
   void UploadHeightField(const mjModel* model, int id);
 
-  void UploadFont(const uint8_t* pixels, int width, int height, int id);
-
   // Returns the filament engine used by the ObjectManager to create filament
   // objects.
   filament::Engine* GetEngine() const { return engine_; }
@@ -90,7 +88,6 @@ class ObjectManager {
   const FilamentBuffers* GetMeshBuffer(int data_id) const;
   const FilamentBuffers* GetShapeBuffer(ShapeType shape) const;
   const FilamentBuffers* GetHeightFieldBuffer(int hfield_id) const;
-  const filament::Texture* GetFont(int font_id) const;
   const filament::Texture* GetTexture(int tex_id) const;
   const filament::Texture* GetTexture(int mat_id, int role) const;
   const filament::Texture* GetTextureWithFallback(int mat_id, int role) const;
@@ -124,7 +121,6 @@ class ObjectManager {
   std::unordered_map<int, FilamentBuffers> meshes_;
   std::unordered_map<int, FilamentBuffers> convex_hulls_;
   std::unordered_map<int, FilamentBuffers> height_fields_;
-  std::unordered_map<int, filament::Texture*> fonts_;
   std::unordered_map<int, filament::Texture*> textures_;
   std::unordered_map<int, SphericalHarmonics> spherical_harmonics_;
   std::unordered_map<int, filament::Texture*> fallback_textures_;

src/experimental/filament/render_context_filament.cc

@@ -137,15 +137,6 @@ void mjr_readPixels(unsigned char* rgb, float* depth, mjrRect viewport,
   g_filament_context->ReadPixels(viewport, rgb, depth);
 }
 
-void mjr_uploadFont(const unsigned char* pixels, int width, int height, int bpp,
-                    int id, const mjrContext* con) {
-  CheckFilamentContext();
-  if (bpp != 4) {
-    mju_error("Only 4bpp fonts are supported, got %d", bpp);
-  }
-  g_filament_context->UploadFont(pixels, width, height, id);
-}
-
 double mjr_getFrameRate(const mjrContext* con) {
   CheckFilamentContext();
   return g_filament_context->GetFrameRate();

src/experimental/filament/render_context_filament.h

@@ -74,9 +74,6 @@ MJAPI void mjr_uploadMesh(const mjModel* m, const mjrContext* con, int meshid);
 
 MJAPI void mjr_uploadTexture(const mjModel* m, const mjrContext* con, int texid);
 
-void mjr_uploadFont(const unsigned char* pixels, int width, int height, int bpp,
-                    int id, const mjrContext* con);
-
 MJAPI void mjr_setBuffer(int framebuffer, mjrContext* con);
 
 MJAPI void mjr_readPixels(unsigned char* rgb, float* depth, mjrRect viewport,