Selectable renderer implementation (#1247)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/mbgl/renderer/tile_render_data.cpp

@@ -9,6 +9,7 @@ TileRenderData::TileRenderData(std::shared_ptr<TileAtlasTextures> atlasTextures_
 
 TileRenderData::~TileRenderData() = default;
 
+#if MLN_DRAWABLE_RENDERER
 static gfx::Texture2DPtr noTexture;
 
 const gfx::Texture2DPtr& TileRenderData::getGlyphAtlasTexture() const {
@@ -18,6 +19,19 @@ const gfx::Texture2DPtr& TileRenderData::getGlyphAtlasTexture() const {
 const gfx::Texture2DPtr& TileRenderData::getIconAtlasTexture() const {
     return atlasTextures ? atlasTextures->icon : noTexture;
 }
+#else
+const gfx::Texture& TileRenderData::getGlyphAtlasTexture() const {
+    assert(atlasTextures);
+    assert(atlasTextures->glyph);
+    return *atlasTextures->glyph;
+}
+
+const gfx::Texture& TileRenderData::getIconAtlasTexture() const {
+    assert(atlasTextures);
+    assert(atlasTextures->icon);
+    return *atlasTextures->icon;
+}
+#endif
 
 std::optional<ImagePosition> TileRenderData::getPattern(const std::string&) const {
     assert(false);