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[Impeller Scene] Add ColorSourceContents for drawing a node (#38485)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| // 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. | ||
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| #include "impeller/entity/contents/scene_contents.h" | ||
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| #include "impeller/entity/contents/content_context.h" | ||
| #include "impeller/entity/contents/tiled_texture_contents.h" | ||
| #include "impeller/entity/entity.h" | ||
| #include "impeller/geometry/path_builder.h" | ||
| #include "impeller/renderer/formats.h" | ||
| #include "impeller/scene/camera.h" | ||
| #include "impeller/scene/scene.h" | ||
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| namespace impeller { | ||
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| SceneContents::SceneContents() = default; | ||
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| SceneContents::~SceneContents() = default; | ||
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| void SceneContents::SetCameraTransform(Matrix matrix) { | ||
| camera_transform_ = matrix; | ||
| } | ||
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| void SceneContents::SetNode(std::shared_ptr<scene::Node> node) { | ||
| node_ = std::move(node); | ||
| } | ||
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| bool SceneContents::Render(const ContentContext& renderer, | ||
| const Entity& entity, | ||
| RenderPass& pass) const { | ||
| if (!node_) { | ||
| return true; | ||
| } | ||
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| auto coverage = GetCoverage(entity); | ||
| if (!coverage.has_value()) { | ||
| return true; | ||
| } | ||
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| // This happens for CoverGeometry (DrawPaint). In this situation, | ||
| // Draw the scene to the full layer. | ||
| if (coverage.value().IsMaximum()) { | ||
| coverage = Rect::MakeSize(pass.GetRenderTargetSize()); | ||
| } | ||
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| RenderTarget subpass_target = RenderTarget::CreateOffscreenMSAA( | ||
| *renderer.GetContext(), // context | ||
| ISize(coverage.value().size), // size | ||
| "SceneContents", // label | ||
| StorageMode::kDeviceTransient, // color_storage_mode | ||
| StorageMode::kDevicePrivate, // color_resolve_storage_mode | ||
| LoadAction::kClear, // color_load_action | ||
| StoreAction::kMultisampleResolve, // color_store_action | ||
| StorageMode::kDeviceTransient, // stencil_storage_mode | ||
| LoadAction::kDontCare, // stencil_load_action | ||
| StoreAction::kDontCare // stencil_store_action | ||
| ); | ||
| if (!subpass_target.IsValid()) { | ||
| return false; | ||
| } | ||
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| scene::Scene scene(renderer.GetSceneContext()); | ||
| scene.GetRoot().AddChild(node_); | ||
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| if (!scene.Render(subpass_target, camera_transform_)) { | ||
| return false; | ||
| } | ||
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| // Render the texture to the pass. | ||
| TiledTextureContents contents; | ||
| contents.SetGeometry(GetGeometry()); | ||
| contents.SetTexture(subpass_target.GetRenderTargetTexture()); | ||
| return contents.Render(renderer, entity, pass); | ||
| } | ||
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| } // namespace impeller |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| // 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. | ||
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| #include <memory> | ||
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| #include "impeller/entity/contents/color_source_contents.h" | ||
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| #include "impeller/geometry/matrix.h" | ||
| #include "impeller/geometry/rect.h" | ||
| #include "impeller/scene/node.h" | ||
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| namespace impeller { | ||
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| class SceneContents final : public ColorSourceContents { | ||
| public: | ||
| SceneContents(); | ||
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| ~SceneContents() override; | ||
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| void SetCameraTransform(Matrix matrix); | ||
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| void SetNode(std::shared_ptr<scene::Node> node); | ||
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| // |Contents| | ||
| bool Render(const ContentContext& renderer, | ||
| const Entity& entity, | ||
| RenderPass& pass) const override; | ||
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| private: | ||
| Matrix camera_transform_; | ||
| std::shared_ptr<scene::Node> node_; | ||
| }; | ||
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| } // namespace impeller |
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