🚀 Overview · Impeller

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🤔 Needs Triage (71)

1

Migrate rendering plugins to SurfaceProducer after stable release

#139702

2

[Impeller] make Playground::OpenPlaygroundHere render one frame if playground is disabled

#139950

3

[Impeller] come up with a better way to organize AiksTests

#140106

4

[Impeller] Compute the Aiks cull rect correctly for filtered SaveLayers.

#140334

5

[Impeller] App is significantly slower using Impeller

#140257

6

ShellTestPlatformViewVulkan does not provide impeller::Context objects

#140419

7

[Impeller] Incorrect kerning with Impeller on 3.16

#140475

8

[Impeller] impellerc's method of creating reflection data should be platform agnostic

#140841

9

[Impeller] new blur: expand coverage clip to work for rotated entities

#140890

10

[Impeller] New Gaussian blur optimization: Add a utility for generating specific mip levels.

#140940

11

[Impeller] Visual glitches on iOS simulator when using Impeller rendering engine.

#140877

12

[Impeller] new blur's downsample step is unaligned

#141046

13

[Impeller] the golden image tests don't catch high dpi differences

#141197

14

[Impeller] Frames in flight abstraction for HostBuffer may need to be app/platform dependenent.

#141201

15

[Impeller] impellerc will blow up if you specify a layout(location= on a sampler2D.

#141219

16

[Impeller] RuntimeEffectContents could calculate the DescriptorSetLayouts earlier and once

#141222

17

[Impeller] Either fix gl_FragCoord for runtime effect shaders or print a warning when it's used.

#141236

18

[Impeller] Generate a UUID for runtime stage shaders to use as a unique key for that shader

#141304

19

[Impeller] texelFetch: There was a compiler error: Only simple shader sampling is supported.

#141362

20

[Impeller] Incorrect blending behavior in framework golden tests

#141465

21

[Impeller] missing hairlines in several golden tests.

#141466

22

[Impeller] Text rendering incorrect in several golden tests.

#141467

23

[Impeller] Potential rendering bug in widgets.shadow.shape_decoration

#141472

24

[Impeller] Fix Windows support (broken by flutter/engine#49726)

#141482

25

[Impeller] vkDestroyPipeline gets called too early sometimes on Vulkan

#141490

⚙️ In Progress (12)

26

[Impeller] Implement framebuffer fetch via subpass in Vulkan.

#128911

1

27

[Impeller] Janky scrolling with backdrop filter blur on 3.16.

#138615

1

28

[Impeller] AiksInspector leaks allocated textures.

#134748

2

29

[Impeller] CreateMockVulkanContext() should become a test harness class.

#134561

4

30

[Impeller] Audit/remove/merge host_debug_impeller_vulkan CI configuration.

#134675

4

31

[Impeller] Track Entity::RenderingMode as an Entity field.

#134764

8

32

[Impeller] MacOS+SwiftShader doesn't render.

#134852

8

33

[Impeller] Track if selected heap for buffer memory is coherent, avoid flush.

#137454

34

Disable partial repaint on iOS simulators.

#138125

35

[Impeller][iOS] Remove nextDrawable latency by deferring drawable acquisition.

#138490

36

[Impeller] Entity pass has hundreds of clips when rendering backdrop filter.

#139493

37

[Impeller] TextureContents lacks docstrings

#139527

🛠️ Internals (40)

38

[Impeller] ☂️ Use hardware features to improve performance of advanced blends.

#120223

1

39

[Impeller] Extend coverage API for filters to allow supplying input coverage Rects

#105810

3

40

[Impeller] Track per-resource synchronization timelines

#120406

3

41

[Impeller] Remove the FLTEnableWideGamut flag.

#126476

4

42

[Impeller] ☂️ Tie up loose ends in the wide-gamut support transition.

#126498

4

43

[Impeller] Opt internal Google3 customers in to using wide-gamut support on iOS after manual testing.

#126501

4

44

[Impeller] Add a way to query for supported Texture PixelFormats.

#133496

4

45

[Impeller] Tune the shaderc limit values to meet OpenGLES2 baselines

#108960

6

46

[Impeller] Ensure optimized out uniforms don't alter offsets

#116900

6

47

[Impeller] Refactor the 2-pass Gaussian blur to use one FilterContents instead of two.

#131579

6

48

[Impeller] Typographer: Track multiple atlas Textures when exceeding the device limit.

#133092

6

49

[Impeller] Move existing Aiks unit-tests to a new dart:ui fixtures based test harness.

#135695

6

50

[Impeller] IMPELLER_DEBUG is overloaded

#136409

6

51

[Impeller] Investigate adding sub-passes as a first class feature in //impeller/renderer

#131034

7

52

[impeller] impeller::DeviceBuffer::CopyHostBuffer must take fml::Mappings instead of raw pointers.

#102262

8

53

[Impeller] Refactor CompilerBackend to remove MSL and GLSL variants.

#106376

8

54

[Impeller] Refactor FilterContents to make it more testable.

#109795

8

55

[Impeller] Create variant of HostBuffer Emplace* to handle SSBO alignment using DefaultUniformAlignment.

#120905

8

56

[Impeller] Add test to assert ios simulator incompatibility with extended range pixel formats.

#121568

8

57

[Impeller] Handle ColorSource and Filter proc setup within Aiks

#125017

8

58

[Impeller] Compiler: GLSL array literals in shaders crash at runtime.

#125630

8

59

[Impeller] Move the stencil coverage logic into Aiks

#126386

8

60

[Impeller] Move context methods to capabilities.

#129920

8

61

[Impeller] Allow batching/threading of geometry computation workloads incl. compute.

#131304

8

62

[Impeller] Relax restriction on render target textures being the exact same size as the render pass.

#131516

8

🖥️ Desktop (8)

63

[Impeller] .webp assets are broken on macOS.

#136365

1

64

[Impeller] Add devicelab integration tests for all desktop backends.

#130461

4

65

[Impeller] Video playback error on macOS.

#135898

6

66

[Impeller] MacOS desktop: Wrap embedder textures in SurfaceMTL

#129218

8

67

[Impeller] Add Impeller support to the embedder test harness

#129220

8

68

[Impeller] Degraded performance when using Impeller on Intel MacBook Pro 2015

#131841

8

69

[Impeller] FragmentShader are not working on macOS with Impeller enabled

#138478

70

[Impeller] Metal validation error when creating textures when run in Designed For iPad mode

#139147

🎨 OpenGL (18)

71

[Impeller] GL backend has a race around surface setup and toImage/toImageSync

#124635

2

72

[Impeller] Texture to Texture blits are misconfigured in GLES backend.

#135818

2

73

[Impeller] Android device that successfully falls back to GLES renderer will print several warning messages

#136059

2

74

[Impeller] Warning about IO manager initialization in the OpenGL ES custom embedder.

#135522

4

75

[Impeller] Wire up UBOs where available on the OpenGL ES backend.

#136105

4

76

[Impeller] Support gradients with overlapping stops on non-SSBO backends.

#111775

6

77

[Impeller] Add support for buffer to texture blits in the OpenGL ES backend.

#123468

6

78

[Impeller] Support YUV to RGB filters on OpenGLES backend

#114588

6

79

[Impeller] OpenGL: Use glClearDepth and glDepthRange on desktop GL.

#136322

6

80

[Impeller] Use OES address sampling mode extensions.

#138504

6

81

[Impeller] Perform sparse buffer uploading in DeviceBufferGLES.

#104447

8

82

[Impeller] OpenGLES Reactor must handle task pinning.

#104784

8

83

[Impeller] OpenGL ES: Reduce API traffic by maintaining a pass bindings cache.

#106056

8

84

[Impeller] GLES: Support 16 bit uniform access

#128881

8

85

[Impeller] Consider using SSBOs where supported in the OpenGL ES backend.

#134247

8

86

[Impeller] OpenGLES embedders text quality affected when changing pixel_ratio.

#135523

8

87

[Impeller] Add feature to allow attribute mapping of uint32s host-side to vec4s shader-side

#102778

10

88

[Impeller] Discarding stencil attachment on default FBO causes Angle to invalidate color texture.

#130048

10

🖖 Vulkan (20)

89

[Impeller] Vulkan Allocator needs capabilities check for expected memory types.

#129784

4

90

[Impeller] Enable Vulkan Validation Layers on CI bot

#118814

6

91

[Impeller] Implement Wide Gamut colors for Vulkan

#127852

6

92

[Impeller] Enable validations for 32 bit builds.

#133167

6

93

[Impeller] Create an Impeller specific Vulkan profile.

#122958

8

94

[Impeller] Verify the integrity of the Vulkan pipeline cache.

#128126

8

95

[Impeller] Vulkan: Support 16 bit uniform access

#128836

8

96

[Impeller] Be smarter about Vulkan pipeline cache persistence.

#129660

8

97

[Impeller] Vulkan: Re-enable clips pipelines with no color attachments.

#131087

8

98

[Impeller] Wire up GL_EXT_debug_printf for printf from shaders in Vulkan.

#131621

10

99

[Impeller] Auto-promote some uniform data to use push constants instead on Vulkan.

#131957

10

100

[Impeller] Investigate alternatives to using the swapchain with Vulkan on Android.

#132512

10

101

[Impeller] Create thread specific ContextVK's

#133159

10

102

[Impeller] [Vulkan] Graphical artifacts while rendering images

#137002

103

[Impeller] Vulkan backend needs to support platforms that only support combined depth-stencil.

#137108

104

[Impeller] Partial Repaint for Vulkan.

#137978

105

[Impeller] Android devices consistently miss first frame due to lazy glyph atlas construction and upload.

#138236

106

[Impeller] Linux_pixel_7pro animated_advanced_blend_perf__timeline_summary is very flaky

#138385

107

[Impeller] vulkan: recycle vkRenderPass and vkFramebuffer

#138856

108

[Impeller] Consider caching or at least trying to reuse VkFramebuffer and RenderPass objects

#141750

🐞 Bugs (35)

109

[Impeller] Alpha behavior different DrawAtlas/DrawVertices with per color blending.

#118914

2

110

[Impeller] Clipping and TileMode issues with saveLayer and blur filters on Impeller.

#130765

2

111

[Impeller] ImageFilter.blur produces different colors in trivial case

#135712

2

112

[Impeller] Clip area is offsetting backdrop image filter

#136083

2

113

[Impeller] Unable to change color of a bitmap font.

#126546

4

114

[Impeller] dart:ui Images used in shaders result in wrong color sampled due to forced mipmapped sampling on Impeller

#131194

4

115

[Impeller] Rect transformations should handle perspective

#131445

4

116

[Impeller] Unsharp circle border when using impeller

#121696

6

117

[Impeller] SaveLayer drawing + the bounds hint does not respect filter geometry transforms

#126388

6

118

[Impeller] SaveLayers with color filters that modify fully transparent black should expand to fill the clip

#126389

6

119

[Impeller] App crashes with MaterialApp checkerboardOffscreenLayers = true

#127080

6

120

[Impeller] Uneven letter spacing.

#127815

6

121

[Impeller] Improve scaling of very large images

#128885

6

122

[Impeller] Flickering lines when drawing on Canvas with CustomPainter on iOS

#129235

6

123

[Impeller] Support correctly mask blurring against any color source when drawing Text.

#133297

6

124

[Impeller] Could not decompress image on intel macOS

#134399

6

125

[Impeller] Text rendering problem with foreground paint set to BlendMode.clear.

#134739

6

126

[Impeller] Image.toByteData does not always produce the expected results

#135706

6

127

[Impeller] 45 degree zero-length lines render nothing.

#109419

8

128

[Impeller] Provide a transform aware fix for minimum stroke widths

#110215

8

129

[Impeller] Metal screenshotter in tests must wait until the GPU is done rendering to the texture before screenshotting.

#129379

8

130

[Impeller] decodeImageFromPixels float32 does not work in impeller

#135702

10

131

[Impeller] Evaluate switching Android page transition from cached version.

#136510

132

[Impeller] Validation errors and no output for saveLayer with drawPaint broken again

#136663

133

[Impeller] Text PaintingStyle.stroke still appears to be inferior to Skia implementation.

#136688

🫖 Flutter GPU (6)

134

[Impeller] Flutter GPU: Deserialize ipscene assets in Flutter UI

#117508

4

135

[Impeller] Cannot build iOS Artifacts for Impeller Scene - scene_flatbuffers.h file not found.

#128929

4

136

[Impeller] Flutter GPU: Run tests on CI.

#127712

6

137

[Flutter GPU] ☂️ MVP

#130921

8

138

[Impeller] Flutter GPU: Allow specifying uniform and vertex data in a type-safe manner in Dart.

#131517

8

139

[Flutter GPU] Make Dart source package developed in flutter/engine available through the flutter framework.

#131711

8

🧮 Compute (3)

140

[Impeller] Trying to access the length() of a SSBO in a compute shader doesn't do the right thing

#112683

6

141

[Impeller] Metal can support non-uniform threadgroup sizes in compute kernels, but right now we're always conservatively assuming uniform sizes.

#110619

8

142

[Impeller] ComputeCommands should generate a validation routine to make sure that all expected buffers are bound.

#122937

8

⚡ Performance (64)

143

[Impeller] Instrument the number and nature of render passes created within a period of time.

#120503

2

144

[Impeller] Add utilities to FilterInput for generating efficient rendering Entities

#122661

2

145

[Impeller] Faster DrawVertices/DrawAtlas via subpass elimination.

#131345

2

146

[Impeller] Implement path tessellation (fills and strokes) on the GPU

#108499

3

147

[Impeller] Benchmark PSO library construction in the constructor of the content context.

#117180

3

148

[Impeller] Label decoded textures as translucent or opaque

#118854

3

149

[Impeller] RenderPassVK::CreateVKFramebuffer can take 28ms

#133182

3

150

[Impeller] RuntimeEffect: Register the shader function earlier

#113719

4

151

[Impeller] Optimize draw order to minimize overdraw

#114402

4

152

[Impeller] Reduce overhead of rectangle and oval drawing with a shape buffer.

#116165

4

153

[Impeller] Better optimizations for color filters applied to images.

#123361

4

154

[Impeller] Better scheduling of texture upload during image decoding.

#123058

4

155

[Impeller] Better optimizations for subpasses which contain only a clip and texture contents.

#124414

4

156

[Impeller] Generate mipmaps when GPU becomes available.

#127697

4

157

[Impeller] Improve performance of CA transaction synchronization when there are multiple layers.

#131577

4

158

[Impeller] FillPointsForPolyLine and TessellateConvex have too much allocation.

#133348

4

159

[Impeller] Allow vertex layout customization at runtime.

#116168

6

160

[Impeller] DrawImageNine is inefficient.

#119477

6

161

[Impeller] Allow instrumentation of allocations.

#120502

6

162

[Impeller] Allow toggling the Metal Performance HUD in Flutter apps.

#121725

6

163

[Impeller] Use CanvasSpy or DlOpSpy in more embedders

#125318

6

164

[Impeller] Make glyph atlas construction eager instead of lazy.

#126172

6

165

[Impeller] Improve performance when rendering contiguous backdrop filter layers.

#131568

6

166

[Impeller] Remove residual clips at the end of non-collapsed subpasses.

#131582

6

167

[Impeller] Gaussian blur: Re-implement the BlurStyles for the 2-pass blur.

#134178

6