| Flutter Impeller |

Classes | Public Member Functions | List of all members
impeller::RuntimeEffectContents Class Referencefinal

`#include <runtime_effect_contents.h>`

Inheritance diagram for impeller::RuntimeEffectContents:

## Classes
struct | TextureInput

## Public Member Functions
void | SetRuntimeStage (std::shared_ptr< RuntimeStage > runtime_stage)
void | SetUniformData (std::shared_ptr< std::vector< uint8_t >> uniform_data)
void | SetTextureInputs (std::vector< TextureInput > texture_inputs)
bool | CanInheritOpacity (const Entity &entity) const override
| Whether or not this contents can accept the opacity peephole optimization. More...
bool | Render (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
Public Member Functions inherited from impeller::ColorSourceContents
| ColorSourceContents ()
| ~ColorSourceContents () override
void | SetGeometry (std::shared_ptr< Geometry > geometry)
| Set the geometry that this contents will use to render. More...
const std::shared_ptr< Geometry > & | GetGeometry () const
| Get the geometry that this contents will use to render. More...
void | SetEffectTransform (Matrix matrix)
| Set the effect transform for this color source. More...
const Matrix & | GetInverseEffectTransform () const
| Set the inverted effect transform for this color source. More...
void | SetOpacityFactor (Scalar opacity)
| Set the opacity factor for this color source. More...
Scalar | GetOpacityFactor () const
| Get the opacity factor for this color source. More...
virtual bool | IsSolidColor () const
std::optional< Rect > | GetCoverage (const Entity &entity) const override
| Get the screen space bounding rectangle that this contents affects. More...
void | SetInheritedOpacity (Scalar opacity) override
| Inherit the provided opacity. More...
Public Member Functions inherited from impeller::Contents
| Contents ()
virtual | ~Contents ()
virtual void | PopulateGlyphAtlas (const std::shared_ptr< LazyGlyphAtlas > &lazy_glyph_atlas, Scalar scale)
| Add any text data to the specified lazy atlas. The scale parameter must be used again later when drawing the text. More...
void | SetCoverageHint (std::optional< Rect > coverage_hint)
| Hint that specifies the coverage area of this Contents that will actually be used during rendering. This is for optimization purposes only and can not be relied on as a clip. May optionally affect the result of `GetCoverage()`. More...
const std::optional< Rect > & | GetCoverageHint () const
virtual bool | IsOpaque () const
| Whether this Contents only emits opaque source colors from the fragment stage. This value does not account for any entity properties (e.g. the blend mode), clips/visibility culling, or inherited opacity. More...
virtual StencilCoverage | GetStencilCoverage (const Entity &entity, const std::optional< Rect > &current_stencil_coverage) const
| Given the current screen space bounding rectangle of the stencil, return the expected stencil coverage after this draw call. This should only be implemented for contents that may write to the stencil buffer. More...
virtual std::optional< Snapshot > | RenderToSnapshot (const ContentContext &renderer, const Entity &entity, std::optional< Rect > coverage_limit=std::nullopt, const std::optional< SamplerDescriptor > &sampler_descriptor=std::nullopt, bool msaa_enabled=true, const std::string &label="Snapshot") const
| Render this contents to a snapshot, respecting the entity's transform, path, stencil depth, and blend mode. The result texture size is always the size of `GetCoverage(entity)`. More...
virtual bool | ShouldRender (const Entity &entity, const std::optional< Rect > &stencil_coverage) const
std::optional< Size > | GetColorSourceSize () const
| Return the color source's intrinsic size, if available. More...
void | SetColorSourceSize (Size size)
virtual std::optional< Color > | AsBackgroundColor (const Entity &entity, ISize target_size) const
| Returns a color if this Contents will flood the given `target_size` with a color. This output color is the "Source" color that will be used for the Entity's blend operation. More...
virtual const FilterContents * | AsFilter () const
| Cast to a filter. Returns `nullptr` if this Contents is not a filter. More...
virtual bool | ApplyColorFilter (const ColorFilterProc &color_filter_proc)
| If possible, applies a color filter to this contents inputs on the CPU. More...

## Additional Inherited Members
Public Types inherited from impeller::Contents
using | ColorFilterProc = std::function< Color(Color)>
using | RenderProc = std::function< bool(const ContentContext &renderer, const Entity &entity, RenderPass &pass)>
using | CoverageProc = std::function< std::optional< Rect >(const Entity &entity)>
Static Public Member Functions inherited from impeller::Contents
static std::shared_ptr< Contents > | MakeAnonymous (RenderProc render_proc, CoverageProc coverage_proc)

## Detailed Description

Definition at line 17 of file runtime_effect_contents.h.

## Member Function Documentation

## ◆ CanInheritOpacity()

bool impeller::RuntimeEffectContents::CanInheritOpacity | ( | const Entity & | entity | ) | const
| override virtual

Whether or not this contents can accept the opacity peephole optimization.

By default all contents return false. Contents are responsible for determining whether or not their own geometries intersect in a way that makes accepting opacity impossible. It is always safe to return false, especially if computing overlap would be computationally expensive.

Reimplemented from impeller::ColorSourceContents.

Definition at line 40 of file runtime_effect_contents.cc.

40 {
41 return false;
42 }

## ◆ Render()

bool impeller::RuntimeEffectContents::Render | ( | const ContentContext & | renderer,
|  | const Entity & | entity,
|  | RenderPass & | pass
| ) |  | const
| override virtual

Get or register shader.

Resolve geometry.

Get or create runtime stage pipeline.

Vertex stage uniforms.

Fragment stage uniforms.

Implements impeller::Contents.

Definition at line 44 of file runtime_effect_contents.cc.

46 {
47 // TODO(jonahwilliams): FragmentProgram API is not fully wired up on Android.
48 // Disable until this is complete so that integration tests and benchmarks can
49 // run m3 applications.
50 #ifdef FML_OS_ANDROID
51 return true;
52 #else
53
54 auto context = renderer.GetContext();
55 auto library = context->GetShaderLibrary();
56
57 //--------------------------------------------------------------------------
58 /// Get or register shader.
59 ///
60
61 // TODO(113719): Register the shader function earlier.
62
63 std::shared_ptr<const ShaderFunction> function = library->GetFunction(
64 runtime_stage_->GetEntrypoint(), ShaderStage::kFragment);
65
66 if (function && runtime_stage_->IsDirty()) {
67 context->GetPipelineLibrary()->RemovePipelinesWithEntryPoint(function);
68 library->UnregisterFunction(runtime_stage_->GetEntrypoint(),
69 ShaderStage::kFragment);
70
71 function = nullptr;
72 }
73
74 if (!function) {
75 std::promise<bool> promise;
76 auto future = promise.get_future();
77
78 library->RegisterFunction(
79 runtime_stage_->GetEntrypoint(),
80 ToShaderStage(runtime_stage_->GetShaderStage()),
81 runtime_stage_->GetCodeMapping(),
82 fml::MakeCopyable([promise = std::move(promise)](bool result) mutable {
83 promise.set_value(result);
84 }));
85
86 if (!future.get()) {
87 VALIDATION_LOG << "Failed to build runtime effect (entry point: "
88 << runtime_stage_->GetEntrypoint() << ")";
89 return false;
90 }
91
92 function = library->GetFunction(runtime_stage_->GetEntrypoint(),
93 ShaderStage::kFragment);
94 if (!function) {
95 VALIDATION_LOG
96 << "Failed to fetch runtime effect function immediately after "
97 "registering it (entry point: "
98 << runtime_stage_->GetEntrypoint() << ")";
99 return false;
100 }
101
102 runtime_stage_->SetClean();
103 }
104
105 //--------------------------------------------------------------------------
106 /// Resolve geometry.
107 ///
108
109 auto geometry_result =
110 GetGeometry()->GetPositionBuffer(renderer, entity, pass);
111
112 //--------------------------------------------------------------------------
113 /// Get or create runtime stage pipeline.
114 ///
115
116 const auto& caps = context->GetCapabilities();
117 const auto color_attachment_format = caps->GetDefaultColorFormat();
118 const auto stencil_attachment_format = caps->GetDefaultStencilFormat();
119
120 using VS = RuntimeEffectVertexShader;
121 PipelineDescriptor desc;
122 desc.SetLabel("Runtime Stage");
123 desc.AddStageEntrypoint(
124 library->GetFunction(VS::kEntrypointName, ShaderStage::kVertex));
125 desc.AddStageEntrypoint(library->GetFunction(runtime_stage_->GetEntrypoint(),
126 ShaderStage::kFragment));
127 auto vertex_descriptor = std::make_shared<VertexDescriptor>();
128 vertex_descriptor->SetStageInputs(VS::kAllShaderStageInputs,
129 VS::kInterleavedBufferLayout);
130 desc.SetVertexDescriptor(std::move(vertex_descriptor));
131 desc.SetColorAttachmentDescriptor(
132 0u, {.format = color_attachment_format, .blending_enabled = true});
133
134 StencilAttachmentDescriptor stencil0;
135 stencil0.stencil_compare = CompareFunction::kEqual;
136 desc.SetStencilAttachmentDescriptors(stencil0);
137 desc.SetStencilPixelFormat(stencil_attachment_format);
138
139 auto options = OptionsFromPassAndEntity(pass, entity);
140 if (geometry_result.prevent_overdraw) {
141 options.stencil_compare = CompareFunction::kEqual;
142 options.stencil_operation = StencilOperation::kIncrementClamp;
143 }
144 options.primitive_type = geometry_result.type;
145 options.ApplyToPipelineDescriptor(desc);
146
147 auto pipeline = context->GetPipelineLibrary()->GetPipeline(desc).Get();
148 if (!pipeline) {
149 VALIDATION_LOG << "Failed to get or create runtime effect pipeline.";
150 return false;
151 }
152
153 Command cmd;
154 DEBUG_COMMAND_INFO(cmd, "RuntimeEffectContents");
155 cmd.pipeline = pipeline;
156 cmd.stencil_reference = entity.GetStencilDepth();
157 cmd.BindVertices(geometry_result.vertex_buffer);
158
159 //--------------------------------------------------------------------------
160 /// Vertex stage uniforms.
161 ///
162
163 VS::FrameInfo frame_info;
164 frame_info.mvp = geometry_result.transform;
165 VS::BindFrameInfo(cmd, pass.GetTransientsBuffer().EmplaceUniform(frame_info));
166
167 //--------------------------------------------------------------------------
168 /// Fragment stage uniforms.
169 ///
170
171 size_t minimum_sampler_index = 100000000;
172 size_t buffer_index = 0;
173 size_t buffer_offset = 0;
174 for (auto uniform : runtime_stage_->GetUniforms()) {
175 // TODO(113715): Populate this metadata once GLES is able to handle
176 // non-struct uniform names.
177 std::shared_ptr<ShaderMetadata> metadata =
178 std::make_shared<ShaderMetadata>();
179
180 switch (uniform.type) {
181 case kSampledImage: {
182 // Sampler uniforms are ordered in the IPLR according to their
183 // declaration and the uniform location reflects the correct offset to
184 // be mapped to - except that it may include all proceeding float
185 // uniforms. For example, a float sampler that comes after 4 float
186 // uniforms may have a location of 4. To convert to the actual offset we
187 // need to find the largest location assigned to a float uniform and
188 // then subtract this from all uniform locations. This is more or less
189 // the same operation we previously performed in the shader compiler.
190 minimum_sampler_index =
191 std::min(minimum_sampler_index, uniform.location);
192 break;
193 }
194 case kFloat: {
195 size_t alignment =
196 std::max(uniform.bit_width / 8, DefaultUniformAlignment());
197 auto buffer_view = pass.GetTransientsBuffer().Emplace(
198 uniform_data_->data() + buffer_offset, uniform.GetSize(),
199 alignment);
200
201 ShaderUniformSlot uniform_slot;
202 uniform_slot.name = uniform.name.c_str();
203 uniform_slot.ext_res_0 = uniform.location;
204 cmd.BindResource(ShaderStage::kFragment, uniform_slot, metadata,
205 buffer_view);
206 buffer_index++;
207 buffer_offset += uniform.GetSize();
208 break;
209 }
210 case kBoolean:
211 case kSignedByte:
212 case kUnsignedByte:
213 case kSignedShort:
214 case kUnsignedShort:
215 case kSignedInt:
216 case kUnsignedInt:
217 case kSignedInt64:
218 case kUnsignedInt64:
219 case kHalfFloat:
220 case kDouble:
221 VALIDATION_LOG << "Unsupported uniform type for " << uniform.name
222 << ".";
223 return true;
224 }
225 }
226
227 size_t sampler_index = 0;
228 for (auto uniform : runtime_stage_->GetUniforms()) {
229 // TODO(113715): Populate this metadata once GLES is able to handle
230 // non-struct uniform names.
231 ShaderMetadata metadata;
232
233 switch (uniform.type) {
234 case kSampledImage: {
235 FML_DCHECK(sampler_index < texture_inputs_.size());
236 auto& input = texture_inputs_[sampler_index];
237
238 auto sampler =
239 context->GetSamplerLibrary()->GetSampler(input.sampler_descriptor);
240
241 SampledImageSlot image_slot;
242 image_slot.name = uniform.name.c_str();
243 image_slot.texture_index = uniform.location - minimum_sampler_index;
244 image_slot.sampler_index = uniform.location - minimum_sampler_index;
245 cmd.BindResource(ShaderStage::kFragment, image_slot, metadata,
246 input.texture, sampler);
247
248 sampler_index++;
249 break;
250 }
251 default:
252 continue;
253 }
254 }
255
256 pass.AddCommand(std::move(cmd));
257
258 if (geometry_result.prevent_overdraw) {
259 auto restore = ClipRestoreContents();
260 restore.SetRestoreCoverage(GetCoverage(entity));
261 return restore.Render(renderer, entity, pass);
262 }
263 return true;
264 #endif // FML_OS_ANDROID
265 }

References impeller::RenderPass::AddCommand(), impeller::PipelineDescriptor::AddStageEntrypoint(), impeller::Command::BindResource(), impeller::Command::BindVertices(), DEBUG_COMMAND_INFO, impeller::DefaultUniformAlignment(), impeller::HostBuffer::Emplace(), impeller::HostBuffer::EmplaceUniform(), impeller::ShaderUniformSlot::ext_res_0, impeller::ContentContext::GetContext(), impeller::ColorSourceContents::GetCoverage(), impeller::ColorSourceContents::GetGeometry(), impeller::Entity::GetStencilDepth(), impeller::RenderPass::GetTransientsBuffer(), impeller::kBoolean, impeller::kDouble, impeller::kEqual, impeller::kFloat, impeller::kFragment, impeller::kHalfFloat, impeller::kIncrementClamp, impeller::kSampledImage, impeller::kSignedByte, impeller::kSignedInt, impeller::kSignedInt64, impeller::kSignedShort, impeller::kUnsignedByte, impeller::kUnsignedInt, impeller::kUnsignedInt64, impeller::kUnsignedShort, impeller::kVertex, impeller::ShaderUniformSlot::name, impeller::SampledImageSlot::name, impeller::OptionsFromPassAndEntity(), impeller::Command::pipeline, impeller::SampledImageSlot::sampler_index, impeller::PipelineDescriptor::SetColorAttachmentDescriptor(), impeller::PipelineDescriptor::SetLabel(), impeller::PipelineDescriptor::SetStencilAttachmentDescriptors(), impeller::PipelineDescriptor::SetStencilPixelFormat(), impeller::PipelineDescriptor::SetVertexDescriptor(), impeller::StencilAttachmentDescriptor::stencil_compare, impeller::Command::stencil_reference, impeller::SampledImageSlot::texture_index, impeller::ToShaderStage(), and VALIDATION_LOG.

## ◆ SetRuntimeStage()

void impeller::RuntimeEffectContents::SetRuntimeStage | ( | std::shared_ptr< RuntimeStage > | runtime_stage | ) |

Definition at line 25 of file runtime_effect_contents.cc.

26 {
27 runtime_stage_ = std::move(runtime_stage);
28 }

## ◆ SetTextureInputs()

void impeller::RuntimeEffectContents::SetTextureInputs | ( | std::vector< TextureInput > | texture_inputs | ) |

Definition at line 35 of file runtime_effect_contents.cc.

36 {
37 texture_inputs_ = std::move(texture_inputs);
38 }

## ◆ SetUniformData()

void impeller::RuntimeEffectContents::SetUniformData | ( | std::shared_ptr< std::vector< uint8_t >> | uniform_data | ) |

Definition at line 30 of file runtime_effect_contents.cc.

31 {
32 uniform_data_ = std::move(uniform_data);
33 }

The documentation for this class was generated from the following files:

- impeller/entity/contents/runtime_effect_contents.h
- impeller/entity/contents/runtime_effect_contents.cc

impeller::kBoolean
@ kBoolean
Definition: runtime_types.h:14
impeller::kFloat
@ kFloat
Definition: runtime_types.h:24
DEBUG_COMMAND_INFO
#define DEBUG_COMMAND_INFO(obj, arg)
Definition: command.h:31
impeller::DefaultUniformAlignment
constexpr size_t DefaultUniformAlignment()
Definition: platform.h:14
impeller::kUnsignedShort
@ kUnsignedShort
Definition: runtime_types.h:18
impeller::kSignedByte
@ kSignedByte
Definition: runtime_types.h:15
impeller::ColorSourceContents::GetGeometry
const std::shared_ptr< Geometry > & GetGeometry() const
Get the geometry that this contents will use to render.
Definition: color_source_contents.cc:21
impeller::kSampledImage
@ kSampledImage
Definition: runtime_types.h:26
impeller::ToShaderStage
constexpr ShaderStage ToShaderStage(RuntimeShaderStage stage)
Definition: shader_types.h:29
impeller::OptionsFromPassAndEntity
ContentContextOptions OptionsFromPassAndEntity(const RenderPass &pass, const Entity &entity)
Definition: contents.cc:30
impeller::kSignedInt
@ kSignedInt
Definition: runtime_types.h:19
impeller::kUnsignedByte
@ kUnsignedByte
Definition: runtime_types.h:16
impeller::kUnsignedInt64
@ kUnsignedInt64
Definition: runtime_types.h:22
impeller::ShaderStage::kFragment
@ kFragment
impeller::kHalfFloat
@ kHalfFloat
Definition: runtime_types.h:23
impeller::kUnsignedInt
@ kUnsignedInt
Definition: runtime_types.h:20
impeller::StencilOperation::kIncrementClamp
@ kIncrementClamp
Increment the current stencil value by 1. Clamp it to the maximum.
impeller::kSignedShort
@ kSignedShort
Definition: runtime_types.h:17
VALIDATION_LOG
#define VALIDATION_LOG
Definition: validation.h:60
impeller::ColorSourceContents::GetCoverage
std::optional< Rect > GetCoverage(const Entity &entity) const override
Get the screen space bounding rectangle that this contents affects.
Definition: color_source_contents.cc:45
impeller::kDouble
@ kDouble
Definition: runtime_types.h:25
impeller::ShaderStage::kVertex
@ kVertex
impeller::kSignedInt64
@ kSignedInt64
Definition: runtime_types.h:21
impeller::CompareFunction::kEqual
@ kEqual
Comparison test passes if new_value == current_value.