[Impeller] cache more pipeline variants at startup.

impeller/entity/contents/content_context.cc

@@ -11,12 +11,14 @@
 #include "impeller/entity/contents/framebuffer_blend_contents.h"
 #include "impeller/entity/entity.h"
 #include "impeller/entity/render_target_cache.h"
+#include "impeller/geometry/color.h"
 #include "impeller/renderer/command_buffer.h"
 #include "impeller/renderer/pipeline_descriptor.h"
 #include "impeller/renderer/pipeline_library.h"
 #include "impeller/renderer/render_target.h"
 #include "impeller/renderer/texture_mipmap.h"
 #include "impeller/tessellator/tessellator.h"
+#include "impeller/typographer/glyph_atlas.h"
 #include "impeller/typographer/typographer_context.h"
 
 namespace impeller {
@@ -454,8 +456,43 @@ ContentContext::ContentContext(
       std::move(clip_color_attachments));
   clip_pipelines_.SetDefault(options, std::make_unique<ClipPipeline>(
                                           *context_, clip_pipeline_descriptor));
-
   is_valid_ = true;
+  CreateDeferredVariants();
+}
+
+// Attempt to populate pipeline variants that are very likely to be used
+// on or near the first frame of the application.
+void ContentContext::CreateDeferredVariants() {
+  auto options = ContentContextOptions{
+      .sample_count = SampleCount::kCount4,
+      .color_attachment_pixel_format =
+          context_->GetCapabilities()->GetDefaultColorFormat()};
+
+  for (const auto mode : {BlendMode::kSource, BlendMode::kSourceOver}) {
+    for (const auto geometry :
+         {PrimitiveType::kTriangle, PrimitiveType::kTriangleStrip}) {
+      options.blend_mode = mode;
+      options.primitive_type = geometry;
+      GetSolidFillPipeline(options);
+      if (context_->GetCapabilities()->SupportsSSBO()) {
+        GetLinearGradientSSBOFillPipeline(options);
+        GetRadialGradientSSBOFillPipeline(options);
+        GetSweepGradientSSBOFillPipeline(options);
+        GetConicalGradientSSBOFillPipeline(options);
+        GetTexturePipeline(options);
+      }
+    }
+  }
+
+  options.blend_mode = BlendMode::kDestination;
+  options.primitive_type = PrimitiveType::kTriangleStrip;
+  for (const auto stencil_mode :
+       {ContentContextOptions::StencilMode::kLegacyClipIncrement,
+        ContentContextOptions::StencilMode::kLegacyClipDecrement,
+        ContentContextOptions::StencilMode::kLegacyClipRestore}) {
+    options.stencil_mode = stencil_mode;
+    GetClipPipeline(options);
+  }
 }
 
 ContentContext::~ContentContext() = default;

impeller/entity/contents/content_context.h

@@ -750,6 +750,10 @@ class ContentContext {
     return uv_compute_pipelines_;
   }
 
+  /// @brief Populate variants of the initial shader set that are likely to be
+  ///        used on the first few frames of an application.
+  void CreateDeferredVariants();
+
   std::shared_ptr<Context> GetContext() const;
 
   const Capabilities& GetDeviceCapabilities() const;
@@ -1029,6 +1033,7 @@ class ContentContext {
       return nullptr;
     }
 
+    FML_LOG(ERROR) << "Create! !";
     auto variant_future = pipeline->CreateVariant(
         [&opts, variants_count =
                     container.GetPipelineCount()](PipelineDescriptor& desc) {

impeller/typographer/typographer_context.h

@@ -7,7 +7,6 @@
 
 #include <memory>
 
-#include "flutter/fml/macros.h"
 #include "impeller/renderer/context.h"
 #include "impeller/typographer/glyph_atlas.h"