| 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 | Render (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
bool | BootstrapShader (const ContentContext &renderer) const
| Load the runtime effect and ensure a default PSO is initialized. More...
Public Member Functions inherited from impeller::ColorSourceContents
| ColorSourceContents ()
| ~ColorSourceContents () override
void | SetGeometry (const Geometry *geometry)
| Set the geometry that this contents will use to render. More...
const 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 area of the render pass that will be affected when this contents is rendered. More...
void | SetInheritedOpacity (Scalar opacity) override
| Inherit the provided opacity. More...
Public Member Functions inherited from impeller::Contents
| Contents ()
virtual | ~Contents ()
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 Matrix &transform) 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 ClipCoverage | GetClipCoverage (const Entity &entity, const std::optional< Rect > &current_clip_coverage) const
| Given the current pass space bounding rectangle of the clip buffer, return the expected clip coverage after this draw call. This should only be implemented for contents that may write to the clip 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, int32_t mip_count=1, const std::string &label="Snapshot") const
| Render this contents to a snapshot, respecting the entity's transform, path, clip depth, and blend mode. The result texture size is always the size of `GetCoverage(entity)`. More...
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)
Protected Types inherited from impeller::ColorSourceContents
using | BindFragmentCallback = std::function< bool(RenderPass &pass)>
using | PipelineBuilderMethod = std::shared_ptr< Pipeline< PipelineDescriptor > >(impeller::ContentContext::*)(ContentContextOptions) const
using | PipelineBuilderCallback = std::function< std::shared_ptr< Pipeline< PipelineDescriptor > >(ContentContextOptions)>
using | CreateGeometryCallback = std::function< GeometryResult(const ContentContext &renderer, const Entity &entity, RenderPass &pass, const Geometry *geom)>
Protected Member Functions inherited from impeller::ColorSourceContents
bool | AppliesAlphaForStrokeCoverage (const Matrix &transform) const
| Whether the entity should be treated as non-opaque due to stroke geometry requiring alpha for coverage. More...
template<typename VertexShaderT >
bool | DrawGeometry (const ContentContext &renderer, const Entity &entity, RenderPass &pass, const PipelineBuilderCallback &pipeline_callback, typename VertexShaderT::FrameInfo frame_info, const BindFragmentCallback &bind_fragment_callback, bool force_stencil=false, const CreateGeometryCallback &create_geom_callback=DefaultCreateGeometryCallback) const
Static Protected Member Functions inherited from impeller::ColorSourceContents
static GeometryResult | DefaultCreateGeometryCallback (const ContentContext &renderer, const Entity &entity, RenderPass &pass, const Geometry *geom)

## Detailed Description

Definition at line 17 of file runtime_effect_contents.h.

## Member Function Documentation

## ◆ BootstrapShader()

bool impeller::RuntimeEffectContents::BootstrapShader | ( | const ContentContext & | renderer | ) | const

Load the runtime effect and ensure a default PSO is initialized.

Definition at line 66 of file runtime_effect_contents.cc.

67 {
68 if (!RegisterShader(renderer)) {
69 return false;
70 }
71 ContentContextOptions options;
72 options.color_attachment_pixel_format =
73 renderer.GetContext()->GetCapabilities()->GetDefaultColorFormat();
74 CreatePipeline(renderer, options, /*async=*/true);
75 return true;
76 }

References impeller::ContentContextOptions::color_attachment_pixel_format, and impeller::ContentContext::GetContext().

## ◆ Render()

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

Get or register shader. Flutter will do this when the runtime effect is first loaded, but this check is added to supporting testing of the Aiks API and non-flutter usage of Impeller.

Fragment stage uniforms.

Now that the descriptor set layouts are known, get the pipeline.

Implements impeller::Contents.

Definition at line 184 of file runtime_effect_contents.cc.

186 {
187 const std::shared_ptr<Context>& context = renderer.GetContext();
188 const std::shared_ptr<ShaderLibrary>& library = context->GetShaderLibrary();
189
190 //--------------------------------------------------------------------------
191 /// Get or register shader. Flutter will do this when the runtime effect
192 /// is first loaded, but this check is added to supporting testing of the
193 /// Aiks API and non-flutter usage of Impeller.
194 ///
195 if (!RegisterShader(renderer)) {
196 return false;
197 }
198
199 //--------------------------------------------------------------------------
200 /// Fragment stage uniforms.
201 ///
202 BindFragmentCallback bind_callback = [this, &renderer,
203 &context](RenderPass& pass) {
204 size_t minimum_sampler_index = 100000000;
205 size_t buffer_index = 0;
206 size_t buffer_offset = 0;
207
208 for (const auto& uniform : runtime_stage_->GetUniforms()) {
209 std::shared_ptr<ShaderMetadata> metadata = MakeShaderMetadata(uniform);
210
211 switch (uniform.type) {
212 case kSampledImage: {
213 // Sampler uniforms are ordered in the IPLR according to their
214 // declaration and the uniform location reflects the correct offset to
215 // be mapped to - except that it may include all proceeding float
216 // uniforms. For example, a float sampler that comes after 4 float
217 // uniforms may have a location of 4. To convert to the actual offset
218 // we need to find the largest location assigned to a float uniform
219 // and then subtract this from all uniform locations. This is more or
220 // less the same operation we previously performed in the shader
221 // compiler.
222 minimum_sampler_index =
223 std::min(minimum_sampler_index, uniform.location);
224 break;
225 }
226 case kFloat: {
227 FML_DCHECK(renderer.GetContext()->GetBackendType() !=
228 Context::BackendType::kVulkan)
229 << "Uniform " << uniform.name
230 << " had unexpected type kFloat for Vulkan backend.";
231
232 size_t alignment =
233 std::max(uniform.bit_width / 8, DefaultUniformAlignment());
234 BufferView buffer_view = renderer.GetTransientsBuffer().Emplace(
235 uniform_data_->data() + buffer_offset, uniform.GetSize(),
236 alignment);
237
238 ShaderUniformSlot uniform_slot;
239 uniform_slot.name = uniform.name.c_str();
240 uniform_slot.ext_res_0 = uniform.location;
241 pass.BindResource(ShaderStage::kFragment,
242 DescriptorType::kUniformBuffer, uniform_slot,
243 metadata, std::move(buffer_view));
244 buffer_index++;
245 buffer_offset += uniform.GetSize();
246 break;
247 }
248 case kStruct: {
249 FML_DCHECK(renderer.GetContext()->GetBackendType() ==
250 Context::BackendType::kVulkan);
251 ShaderUniformSlot uniform_slot;
252 uniform_slot.name = uniform.name.c_str();
253 uniform_slot.binding = uniform.location;
254
255 // TODO(jonahwilliams): rewrite this to emplace directly into
256 // HostBuffer.
257 std::vector<float> uniform_buffer;
258 uniform_buffer.reserve(uniform.struct_layout.size());
259 size_t uniform_byte_index = 0u;
260 for (const auto& byte_type : uniform.struct_layout) {
261 if (byte_type == 0) {
262 uniform_buffer.push_back(0.f);
263 } else if (byte_type == 1) {
264 uniform_buffer.push_back(reinterpret_cast<float*>(
265 uniform_data_->data())[uniform_byte_index++]);
266 } else {
267 FML_UNREACHABLE();
268 }
269 }
270 size_t alignment = std::max(sizeof(float) * uniform_buffer.size(),
271 DefaultUniformAlignment());
272
273 BufferView buffer_view = renderer.GetTransientsBuffer().Emplace(
274 reinterpret_cast<const void*>(uniform_buffer.data()),
275 sizeof(float) * uniform_buffer.size(), alignment);
276 pass.BindResource(ShaderStage::kFragment,
277 DescriptorType::kUniformBuffer, uniform_slot,
278 ShaderMetadata{}, std::move(buffer_view));
279 }
280 }
281 }
282
283 size_t sampler_index = 0;
284 for (const auto& uniform : runtime_stage_->GetUniforms()) {
285 std::shared_ptr<ShaderMetadata> metadata = MakeShaderMetadata(uniform);
286
287 switch (uniform.type) {
288 case kSampledImage: {
289 FML_DCHECK(sampler_index < texture_inputs_.size());
290 auto& input = texture_inputs_[sampler_index];
291
292 const std::unique_ptr<const Sampler>& sampler =
293 context->GetSamplerLibrary()->GetSampler(
294 input.sampler_descriptor);
295
296 SampledImageSlot image_slot;
297 image_slot.name = uniform.name.c_str();
298 image_slot.binding = uniform.binding;
299 image_slot.texture_index = uniform.location - minimum_sampler_index;
300 pass.BindResource(ShaderStage::kFragment,
301 DescriptorType::kSampledImage, image_slot,
302 *metadata, input.texture, sampler);
303
304 sampler_index++;
305 break;
306 }
307 default:
308 continue;
309 }
310 }
311 return true;
312 };
313
314 /// Now that the descriptor set layouts are known, get the pipeline.
315 using VS = RuntimeEffectVertexShader;
316
317 PipelineBuilderCallback pipeline_callback =
318 [&](ContentContextOptions options) {
319 // Pipeline creation callback for the cache handler to call.
320 return renderer.GetCachedRuntimeEffectPipeline(
321 runtime_stage_->GetEntrypoint(), options, [&]() {
322 return CreatePipeline(renderer, options, /*async=*/false);
323 });
324 };
325
326 return ColorSourceContents::DrawGeometry<VS>(renderer, entity, pass,
327 pipeline_callback,
328 VS::FrameInfo{}, bind_callback);
329 }

References impeller::ShaderUniformSlot::binding, impeller::SampledImageSlot::binding, impeller::RenderPass::BindResource(), buffer_view, impeller::DefaultUniformAlignment(), impeller::HostBuffer::Emplace(), impeller::ShaderUniformSlot::ext_res_0, impeller::ContentContext::GetCachedRuntimeEffectPipeline(), impeller::ContentContext::GetContext(), impeller::ContentContext::GetTransientsBuffer(), impeller::kFloat, impeller::kFragment, impeller::kSampledImage, impeller::kStruct, impeller::kUniformBuffer, impeller::Context::kVulkan, impeller::MakeShaderMetadata(), impeller::ShaderUniformSlot::name, impeller::SampledImageSlot::name, and impeller::SampledImageSlot::texture_index.

## ◆ SetRuntimeStage()

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

Definition at line 27 of file runtime_effect_contents.cc.

28 {
29 runtime_stage_ = std::move(runtime_stage);
30 }

## ◆ SetTextureInputs()

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

Definition at line 37 of file runtime_effect_contents.cc.

38 {
39 texture_inputs_ = std::move(texture_inputs);
40 }

## ◆ SetUniformData()

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

Definition at line 32 of file runtime_effect_contents.cc.

33 {
34 uniform_data_ = std::move(uniform_data);
35 }

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::ColorSourceContents::PipelineBuilderCallback
std::function< std::shared_ptr< Pipeline< PipelineDescriptor > >(ContentContextOptions)> PipelineBuilderCallback
Definition: color_source_contents.h:108
impeller::kFloat
@ kFloat
Definition: runtime_types.h:23
impeller::MakeShaderMetadata
static std::shared_ptr< ShaderMetadata > MakeShaderMetadata(const RuntimeUniformDescription &uniform)
Definition: runtime_effect_contents.cc:53
impeller::DefaultUniformAlignment
constexpr size_t DefaultUniformAlignment()
Definition: platform.h:14
impeller::kSampledImage
@ kSampledImage
Definition: runtime_types.h:24
buffer_view
BufferView buffer_view
Definition: blit_command_gles.cc:128
impeller::VS
SolidFillVertexShader VS
Definition: stroke_path_geometry.cc:16
impeller::ShaderStage::kFragment
@ kFragment
impeller::kStruct
@ kStruct
Definition: runtime_types.h:25
impeller::DescriptorType::kSampledImage
@ kSampledImage
impeller::DescriptorType::kUniformBuffer
@ kUniformBuffer
impeller::Context::BackendType::kVulkan
@ kVulkan
impeller::ColorSourceContents::BindFragmentCallback
std::function< bool(RenderPass &pass)> BindFragmentCallback
Definition: color_source_contents.h:103