Setup aiks for canvas subpasses.

Author: chinmaygarde

impeller/aiks/BUILD.gn

@@ -6,6 +6,8 @@ import("../tools/impeller.gni")
 
 impeller_component("aiks") {
   sources = [
+    "aiks_renderer.cc",
+    "aiks_renderer.h",
     "canvas.cc",
     "canvas.h",
     "canvas_pass.cc",
@@ -18,8 +20,6 @@ impeller_component("aiks") {
     "picture.h",
     "picture_recorder.cc",
     "picture_recorder.h",
-    "picture_renderer.cc",
-    "picture_renderer.h",
   ]
 
   public_deps = [

impeller/aiks/aiks_playground.cc

@@ -4,7 +4,7 @@
 
 #include "impeller/aiks/aiks_playground.h"
 
-#include "impeller/aiks/picture_renderer.h"
+#include "impeller/aiks/aiks_renderer.h"
 
 namespace impeller {
 
@@ -13,14 +13,15 @@ AiksPlayground::AiksPlayground() = default;
 AiksPlayground::~AiksPlayground() = default;
 
 bool AiksPlayground::OpenPlaygroundHere(const Picture& picture) {
-  auto renderer = std::make_shared<PictureRenderer>(GetContext());
-  if (!renderer) {
+  AiksRenderer renderer(GetContext());
+
+  if (!renderer.IsValid()) {
     return false;
   }
 
   return Playground::OpenPlaygroundHere(
-      [renderer, &picture](RenderPass& pass) -> bool {
-        return renderer->Render(pass, picture);
+      [&renderer, &picture](RenderPass& pass) -> bool {
+        return renderer.Render(picture, pass);
       });
 }
 

impeller/aiks/aiks_renderer.cc

@@ -0,0 +1,49 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "impeller/aiks/aiks_renderer.h"
+
+#include "impeller/aiks/picture.h"
+
+namespace impeller {
+
+AiksRenderer::AiksRenderer(std::shared_ptr<Context> context)
+    : context_(std::move(context)) {
+  if (!context_ || !context_->IsValid()) {
+    return;
+  }
+
+  content_renderer_ = std::make_unique<ContentRenderer>(context_);
+  if (!content_renderer_->IsValid()) {
+    return;
+  }
+
+  is_valid_ = true;
+}
+
+AiksRenderer::~AiksRenderer() = default;
+
+bool AiksRenderer::IsValid() const {
+  return is_valid_;
+}
+
+bool AiksRenderer::Render(const Picture& picture, RenderPass& parent_pass) {
+  if (!IsValid()) {
+    return false;
+  }
+
+  for (const auto& entry : picture.entries) {
+    if (!entry.pass.has_value()) {
+      continue;
+      ;
+    }
+
+    if (!entry.pass->Render(*content_renderer_, parent_pass)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+}  // namespace impeller

impeller/entity/entity_renderer.h renamed to impeller/aiks/aiks_renderer.h

@@ -7,31 +7,30 @@
 #include <memory>
 
 #include "flutter/fml/macros.h"
-#include "impeller/entity/entity.h"
+#include "impeller/entity/content_renderer.h"
 #include "impeller/renderer/context.h"
-#include "impeller/renderer/surface.h"
 
 namespace impeller {
 
-class ContentRenderer;
+struct Picture;
+class RenderPass;
 
-class EntityRenderer {
+class AiksRenderer {
  public:
-  EntityRenderer(std::shared_ptr<Context> context);
+  AiksRenderer(std::shared_ptr<Context> context);
 
-  ~EntityRenderer();
+  ~AiksRenderer();
 
   bool IsValid() const;
 
-  [[nodiscard]] bool RenderEntities(RenderPass& parent_pass,
-                                    const std::vector<Entity>& entities);
+  bool Render(const Picture& picture, RenderPass& parent_pass);
 
  private:
   std::shared_ptr<Context> context_;
   std::unique_ptr<ContentRenderer> content_renderer_;
   bool is_valid_ = false;
 
-  FML_DISALLOW_COPY_AND_ASSIGN(EntityRenderer);
+  FML_DISALLOW_COPY_AND_ASSIGN(AiksRenderer);
 };
 
 }  // namespace impeller

impeller/aiks/canvas.cc

@@ -94,7 +94,7 @@ void Canvas::DrawPicture(const Picture& picture) {
   for (const auto& stack_entry : picture.entries) {
     auto new_stack_entry = stack_entry;
     if (auto pass = new_stack_entry.pass) {
-      for (auto entity : pass->GetPassEntities()) {
+      for (auto entity : pass->GetEntities()) {
         entity.IncrementStencilDepth(GetStencilDepth());
         entity.SetTransformation(GetCurrentTransformation() *
                                  entity.GetTransformation());

impeller/aiks/canvas_pass.cc

@@ -4,31 +4,25 @@
 
 #include "impeller/aiks/canvas_pass.h"
 
+#include "impeller/entity/content_renderer.h"
+
 namespace impeller {
 
 CanvasPass::CanvasPass() = default;
 
 CanvasPass::~CanvasPass() = default;
 
 void CanvasPass::PushEntity(Entity entity) {
-  ops_.emplace_back(std::move(entity));
-}
-
-const std::vector<Entity>& CanvasPass::GetPassEntities() const {
-  return ops_;
+  entities_.emplace_back(std::move(entity));
 }
 
-void CanvasPass::SetPostProcessingEntity(Entity entity) {
-  post_processing_entity_ = std::move(entity);
-}
-
-const Entity& CanvasPass::GetPostProcessingEntity() const {
-  return post_processing_entity_;
+const std::vector<Entity>& CanvasPass::GetEntities() const {
+  return entities_;
 }
 
 Rect CanvasPass::GetCoverageRect() const {
   std::optional<Point> min, max;
-  for (const auto& entity : ops_) {
+  for (const auto& entity : entities_) {
     auto coverage = entity.GetPath().GetMinMaxCoveragePoints();
     if (!coverage.has_value()) {
       continue;
@@ -49,4 +43,23 @@ Rect CanvasPass::GetCoverageRect() const {
   return {min->x, min->y, diff.x, diff.y};
 }
 
+const CanvasPass::Subpasses& CanvasPass::GetSubpasses() const {
+  return subpasses_;
+}
+
+bool CanvasPass::AddSubpass(CanvasPass pass) {
+  subpasses_.emplace_back(std::move(pass));
+  return true;
+}
+
+bool CanvasPass::Render(ContentRenderer& renderer,
+                        RenderPass& parent_pass) const {
+  for (const auto& entity : entities_) {
+    if (!entity.Render(renderer, parent_pass)) {
+      return false;
+    }
+  }
+  return true;
+}
+
 }  // namespace impeller

impeller/aiks/canvas_pass.h

@@ -6,15 +6,20 @@
 
 #include <memory>
 #include <optional>
+#include <vector>
 
 #include "flutter/fml/macros.h"
 #include "impeller/entity/contents.h"
 #include "impeller/entity/entity.h"
 
 namespace impeller {
 
+class ContentRenderer;
+
 class CanvasPass {
  public:
+  using Subpasses = std::vector<CanvasPass>;
+
   CanvasPass();
 
   ~CanvasPass();
@@ -23,15 +28,17 @@ class CanvasPass {
 
   Rect GetCoverageRect() const;
 
-  const std::vector<Entity>& GetPassEntities() const;
+  const std::vector<Entity>& GetEntities() const;
+
+  const Subpasses& GetSubpasses() const;
 
-  void SetPostProcessingEntity(Entity entity);
+  bool AddSubpass(CanvasPass pass);
 
-  const Entity& GetPostProcessingEntity() const;
+  bool Render(ContentRenderer& renderer, RenderPass& parent_pass) const;
 
  private:
-  std::vector<Entity> ops_;
-  Entity post_processing_entity_;
+  std::vector<Entity> entities_;
+  Subpasses subpasses_;
 };
 
 struct CanvasStackEntry {

impeller/aiks/picture_renderer.cc

@@ -27,8 +27,6 @@ impeller_component("entity") {
     "contents.h",
     "entity.cc",
     "entity.h",
-    "entity_renderer.cc",
-    "entity_renderer.h",
   ]
 
   deps = [ ":entity_shaders" ]

impeller/aiks/picture_renderer.h

@@ -4,6 +4,9 @@
 
 #include "impeller/entity/entity.h"
 
+#include "impeller/entity/content_renderer.h"
+#include "impeller/renderer/render_pass.h"
+
 namespace impeller {
 
 Entity::Entity() = default;
@@ -46,4 +49,12 @@ void Entity::IncrementStencilDepth(uint32_t increment) {
   stencil_depth_ += increment;
 }
 
+bool Entity::Render(ContentRenderer& renderer, RenderPass& parent_pass) const {
+  if (!contents_) {
+    return true;
+  }
+
+  return contents_->Render(renderer, *this, parent_pass);
+}
+
 }  // namespace impeller

impeller/entity/BUILD.gn

@@ -13,6 +13,9 @@
 
 namespace impeller {
 
+class Renderer;
+class RenderPass;
+
 class Entity {
  public:
   Entity();
@@ -37,6 +40,8 @@ class Entity {
 
   uint32_t GetStencilDepth() const;
 
+  bool Render(ContentRenderer& renderer, RenderPass& parent_pass) const;
+
  private:
   Matrix transformation_;
   std::shared_ptr<Contents> contents_;