| Flutter Impeller |

runtime_effect_contents.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "impeller/entity/contents/runtime_effect_contents.h"
6
7 #include <algorithm>
8 #include <future>
9 #include <memory>
10
11 #include "flutter/fml/logging.h"
12 #include "flutter/fml/make_copyable.h"
13 #include "impeller/base/validation.h"
14 #include "impeller/core/formats.h"
15 #include "impeller/core/runtime_types.h"
16 #include "impeller/core/shader_types.h"
17 #include "impeller/entity/contents/content_context.h"
18 #include "impeller/entity/runtime_effect.vert.h"
19 #include "impeller/renderer/capabilities.h"
20 #include "impeller/renderer/pipeline_library.h"
21 #include "impeller/renderer/render_pass.h"
22 #include "impeller/renderer/shader_function.h"
23 #include "impeller/renderer/vertex_descriptor.h"
24
25 namespace impeller {
26
27 namespace {
28 constexpr char kPaddingType = 0;
29 constexpr char kFloatType = 1;
30 } // namespace
31
32 // static
33 BufferView RuntimeEffectContents::EmplaceVulkanUniform(
34 const std::shared_ptr<const std::vector<uint8_t>>& input_data,
35 HostBuffer& data_host_buffer,
36 const RuntimeUniformDescription& uniform,
37 size_t minimum_uniform_alignment) {
38 // TODO(jonahwilliams): rewrite this to emplace directly into
39 // HostBuffer.
40 std::vector<float> uniform_buffer;
41 uniform_buffer.reserve(uniform.struct_layout.size());
42 size_t uniform_byte_index = 0u;
43 for (char byte_type : uniform.struct_layout) {
44 if (byte_type == kPaddingType) {
45 uniform_buffer.push_back(0.f);
46 } else {
47 FML_DCHECK(byte_type == kFloatType);
48 uniform_buffer.push_back(reinterpret_cast<const float*>(
49 input_data->data())[uniform_byte_index++]);
50 }
51 }
52
53 return data_host_buffer.Emplace(
54 reinterpret_cast<const void*>(uniform_buffer.data()),
55 sizeof(float) * uniform_buffer.size(), minimum_uniform_alignment);
56 }
57
58 void RuntimeEffectContents::SetRuntimeStage(
59 std::shared_ptr<RuntimeStage> runtime_stage) {
60 runtime_stage_ = std::move(runtime_stage);
61 }
62
63 void RuntimeEffectContents::SetUniformData(
64 std::shared_ptr<std::vector<uint8_t>> uniform_data) {
65 uniform_data_ = std::move(uniform_data);
66 }
67
68 void RuntimeEffectContents::SetTextureInputs(
69 std::vector<TextureInput> texture_inputs) {
70 texture_inputs_ = std::move(texture_inputs);
71 }
72
73 static ShaderType GetShaderType(RuntimeUniformType type) {
74 switch (type) {
75 case kSampledImage:
76 return ShaderType::kSampledImage;
77 case kFloat:
78 return ShaderType::kFloat;
79 case kStruct:
80 return ShaderType::kStruct;
81 }
82 }
83
84 static std::unique_ptr<ShaderMetadata> MakeShaderMetadata(
85 const RuntimeUniformDescription& uniform) {
86 std::unique_ptr<ShaderMetadata> metadata = std::make_unique<ShaderMetadata>();
87 metadata->name = uniform.name;
88 metadata->members.emplace_back(ShaderStructMemberMetadata{
89 .type = GetShaderType(uniform.type), //
90 .size = uniform.dimensions.rows * uniform.dimensions.cols *
91 (uniform.bit_width / 8u), //
92 .byte_length =
93 (uniform.bit_width / 8u) * uniform.array_elements.value_or(1), //
94 .array_elements = uniform.array_elements //
95 });
96
97 return metadata;
98 }
99
100 bool RuntimeEffectContents::BootstrapShader(
101 const ContentContext& renderer) const {
102 if (!RegisterShader(renderer)) {
103 return false;
104 }
105 ContentContextOptions options;
106 options.color_attachment_pixel_format =
107 renderer.GetContext()->GetCapabilities()->GetDefaultColorFormat();
108 CreatePipeline(renderer, options, /*async=*/true);
109 return true;
110 }
111
112 bool RuntimeEffectContents::RegisterShader(
113 const ContentContext& renderer) const {
114 const std::shared_ptr<Context>& context = renderer.GetContext();
115 const std::shared_ptr<ShaderLibrary>& library = context->GetShaderLibrary();
116
117 std::shared_ptr<const ShaderFunction> function = library->GetFunction(
118 runtime_stage_->GetEntrypoint(), ShaderStage::kFragment);
119
120 //--------------------------------------------------------------------------
121 /// Resolve runtime stage function.
122 ///
123
124 if (function && runtime_stage_->IsDirty()) {
125 renderer.ClearCachedRuntimeEffectPipeline(runtime_stage_->GetEntrypoint());
126 context->GetPipelineLibrary()->RemovePipelinesWithEntryPoint(function);
127 library->UnregisterFunction(runtime_stage_->GetEntrypoint(),
128 ShaderStage::kFragment);
129
130 function = nullptr;
131 }
132
133 if (!function) {
134 std::promise<bool> promise;
135 auto future = promise.get_future();
136
137 library->RegisterFunction(
138 runtime_stage_->GetEntrypoint(),
139 ToShaderStage(runtime_stage_->GetShaderStage()),
140 runtime_stage_->GetCodeMapping(),
141 fml::MakeCopyable([promise = std::move(promise)](bool result) mutable {
142 promise.set_value(result);
143 }));
144
145 if (!future.get()) {
146 VALIDATION_LOG << "Failed to build runtime effect (entry point: "
147 << runtime_stage_->GetEntrypoint() << ")";
148 return false;
149 }
150
151 function = library->GetFunction(runtime_stage_->GetEntrypoint(),
152 ShaderStage::kFragment);
153 if (!function) {
154 VALIDATION_LOG
155 << "Failed to fetch runtime effect function immediately after "
156 "registering it (entry point: "
157 << runtime_stage_->GetEntrypoint() << ")";
158 return false;
159 }
160
161 runtime_stage_->SetClean();
162 }
163 return true;
164 }
165
166 std::shared_ptr<Pipeline<PipelineDescriptor>>
167 RuntimeEffectContents::CreatePipeline(const ContentContext& renderer,
168 ContentContextOptions options,
169 bool async) const {
170 const std::shared_ptr<Context>& context = renderer.GetContext();
171 const std::shared_ptr<ShaderLibrary>& library = context->GetShaderLibrary();
172 const std::shared_ptr<const Capabilities>& caps = context->GetCapabilities();
173 const PixelFormat color_attachment_format = caps->GetDefaultColorFormat();
174 const PixelFormat stencil_attachment_format =
175 caps->GetDefaultDepthStencilFormat();
176
177 using VS = RuntimeEffectVertexShader;
178
179 PipelineDescriptor desc;
180 desc.SetLabel("Runtime Stage");
181 desc.AddStageEntrypoint(
182 library->GetFunction(VS::kEntrypointName, ShaderStage::kVertex));
183 desc.AddStageEntrypoint(library->GetFunction(runtime_stage_->GetEntrypoint(),
184 ShaderStage::kFragment));
185
186 std::shared_ptr<VertexDescriptor> vertex_descriptor =
187 std::make_shared<VertexDescriptor>();
188 vertex_descriptor->SetStageInputs(VS::kAllShaderStageInputs,
189 VS::kInterleavedBufferLayout);
190 vertex_descriptor->RegisterDescriptorSetLayouts(VS::kDescriptorSetLayouts);
191 vertex_descriptor->RegisterDescriptorSetLayouts(
192 runtime_stage_->GetDescriptorSetLayouts().data(),
193 runtime_stage_->GetDescriptorSetLayouts().size());
194 desc.SetVertexDescriptor(std::move(vertex_descriptor));
195 desc.SetColorAttachmentDescriptor(
196 0u, {.format = color_attachment_format, .blending_enabled = true});
197
198 desc.SetStencilAttachmentDescriptors(StencilAttachmentDescriptor{});
199 desc.SetStencilPixelFormat(stencil_attachment_format);
200
201 desc.SetDepthStencilAttachmentDescriptor(DepthAttachmentDescriptor{});
202 desc.SetDepthPixelFormat(stencil_attachment_format);
203
204 options.ApplyToPipelineDescriptor(desc);
205 if (async) {
206 context->GetPipelineLibrary()->GetPipeline(desc, async);
207 return nullptr;
208 }
209
210 auto pipeline = context->GetPipelineLibrary()->GetPipeline(desc, async).Get();
211 if (!pipeline) {
212 VALIDATION_LOG << "Failed to get or create runtime effect pipeline.";
213 return nullptr;
214 }
215
216 return pipeline;
217 }
218
219 bool RuntimeEffectContents::Render(const ContentContext& renderer,
220 const Entity& entity,
221 RenderPass& pass) const {
222 const std::shared_ptr<Context>& context = renderer.GetContext();
223 const std::shared_ptr<ShaderLibrary>& library = context->GetShaderLibrary();
224
225 //--------------------------------------------------------------------------
226 /// Get or register shader. Flutter will do this when the runtime effect
227 /// is first loaded, but this check is added to supporting testing of the
228 /// Aiks API and non-flutter usage of Impeller.
229 ///
230 if (!RegisterShader(renderer)) {
231 return false;
232 }
233
234 //--------------------------------------------------------------------------
235 /// Fragment stage uniforms.
236 ///
237 BindFragmentCallback bind_callback = [this, &renderer,
238 &context](RenderPass& pass) {
239 size_t buffer_index = 0;
240 size_t buffer_offset = 0;
241 size_t sampler_location = 0;
242 size_t buffer_location = 0;
243
244 // Uniforms are ordered in the IPLR according to their
245 // declaration and the uniform location reflects the correct offset to
246 // be mapped to - except that it may include all proceeding
247 // uniforms of a different type. For example, a texture sampler that comes
248 // after 4 float uniforms may have a location of 4. Since we know that
249 // the declarations are already ordered, we can track the uniform location
250 // ourselves.
251 auto& data_host_buffer = renderer.GetTransientsDataBuffer();
252 for (const auto& uniform : runtime_stage_->GetUniforms()) {
253 std::unique_ptr<ShaderMetadata> metadata = MakeShaderMetadata(uniform);
254 switch (uniform.type) {
255 case kSampledImage: {
256 FML_DCHECK(sampler_location < texture_inputs_.size());
257 auto& input = texture_inputs_[sampler_location];
258
259 raw_ptr<const Sampler> sampler =
260 context->GetSamplerLibrary()->GetSampler(
261 input.sampler_descriptor);
262
263 SampledImageSlot image_slot;
264 image_slot.name = uniform.name.c_str();
265 image_slot.binding = uniform.binding;
266 image_slot.texture_index = sampler_location;
267 pass.BindDynamicResource(ShaderStage::kFragment,
268 DescriptorType::kSampledImage, image_slot,
269 std::move(metadata), input.texture, sampler);
270 sampler_location++;
271 break;
272 }
273 case kFloat: {
274 FML_DCHECK(renderer.GetContext()->GetBackendType() !=
275 Context::BackendType::kVulkan)
276 << "Uniform " << uniform.name
277 << " had unexpected type kFloat for Vulkan backend.";
278
279 size_t alignment =
280 std::max(uniform.bit_width / 8,
281 data_host_buffer.GetMinimumUniformAlignment());
282 BufferView buffer_view =
283 data_host_buffer.Emplace(uniform_data_->data() + buffer_offset,
284 uniform.GetSize(), alignment);
285
286 ShaderUniformSlot uniform_slot;
287 uniform_slot.name = uniform.name.c_str();
288 uniform_slot.ext_res_0 = buffer_location;
289 pass.BindDynamicResource(ShaderStage::kFragment,
290 DescriptorType::kUniformBuffer, uniform_slot,
291 std::move(metadata), std::move(buffer_view));
292 buffer_index++;
293 buffer_offset += uniform.GetSize();
294 buffer_location++;
295 break;
296 }
297 case kStruct: {
298 FML_DCHECK(renderer.GetContext()->GetBackendType() ==
299 Context::BackendType::kVulkan);
300 ShaderUniformSlot uniform_slot;
301 uniform_slot.binding = uniform.location;
302 uniform_slot.name = uniform.name.c_str();
303
304 pass.BindResource(ShaderStage::kFragment,
305 DescriptorType::kUniformBuffer, uniform_slot,
306 nullptr,
307 EmplaceVulkanUniform(
308 uniform_data_, data_host_buffer, uniform,
309 data_host_buffer.GetMinimumUniformAlignment()));
310 }
311 }
312 }
313
314 return true;
315 };
316
317 /// Now that the descriptor set layouts are known, get the pipeline.
318 using VS = RuntimeEffectVertexShader;
319
320 PipelineBuilderCallback pipeline_callback =
321 [&](ContentContextOptions options) {
322 // Pipeline creation callback for the cache handler to call.
323 return renderer.GetCachedRuntimeEffectPipeline(
324 runtime_stage_->GetEntrypoint(), options, [&]() {
325 return CreatePipeline(renderer, options, /*async=*/false);
326 });
327 };
328
329 return ColorSourceContents::DrawGeometry<VS>(renderer, entity, pass,
330 pipeline_callback,
331 VS::FrameInfo{}, bind_callback);
332 }
333
334 } // namespace impeller
type
GLenum type
Definition: blit_command_gles.cc:153
buffer_view
BufferView buffer_view
Definition: blit_command_gles.cc:154
capabilities.h
impeller::ColorSourceContents::PipelineBuilderCallback
std::function< PipelineRef(ContentContextOptions)> PipelineBuilderCallback
Definition: color_source_contents.h:42
impeller::ColorSourceContents::BindFragmentCallback
std::function< bool(RenderPass &pass)> BindFragmentCallback
Definition: color_source_contents.h:40
impeller::ContentContext
Definition: content_context.h:138
impeller::ContentContext::ClearCachedRuntimeEffectPipeline
void ClearCachedRuntimeEffectPipeline(const std::string &unique_entrypoint_name) const
Definition: content_context.cc:971
impeller::ContentContext::GetCachedRuntimeEffectPipeline
PipelineRef GetCachedRuntimeEffectPipeline(const std::string &unique_entrypoint_name, const ContentContextOptions &options, const std::function< std::shared_ptr< Pipeline< PipelineDescriptor >>()> &create_callback) const
Definition: content_context.cc:958
impeller::ContentContext::GetTransientsDataBuffer
HostBuffer & GetTransientsDataBuffer() const
Retrieve the current host buffer for transient storage of other non-index data.
Definition: content_context.h:310
impeller::ContentContext::GetContext
std::shared_ptr< Context > GetContext() const
Definition: content_context.cc:950
impeller::Context::BackendType::kVulkan
@ kVulkan
impeller::Entity
Definition: entity.h:26
impeller::HostBuffer
Definition: host_buffer.h:26
impeller::HostBuffer::Emplace
BufferView Emplace(const BufferType &buffer, size_t alignment=0)
Emplace non-uniform data (like contiguous vertices) onto the host buffer.
Definition: host_buffer.h:92
impeller::RenderPass
Render passes encode render commands directed as one specific render target into an underlying comman...
Definition: render_pass.h:30
impeller::RenderPass::BindDynamicResource
virtual bool BindDynamicResource(ShaderStage stage, DescriptorType type, const SampledImageSlot &slot, std::unique_ptr< ShaderMetadata > metadata, std::shared_ptr< const Texture > texture, raw_ptr< const Sampler >)
Bind with dynamically generated shader metadata.
Definition: render_pass.cc:270
impeller::RenderPass::BindResource
virtual bool BindResource(ShaderStage stage, DescriptorType type, const ShaderUniformSlot &slot, const ShaderMetadata *metadata, BufferView view) override
Definition: render_pass.cc:225
impeller::RuntimeEffectContents::EmplaceVulkanUniform
static BufferView EmplaceVulkanUniform(const std::shared_ptr< const std::vector< uint8_t >> &input_data, HostBuffer &host_buffer, const RuntimeUniformDescription &uniform, size_t minimum_uniform_alignment)
Definition: runtime_effect_contents.cc:33
impeller::RuntimeEffectContents::Render
bool Render(const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
Definition: runtime_effect_contents.cc:219
impeller::RuntimeEffectContents::BootstrapShader
bool BootstrapShader(const ContentContext &renderer) const
Load the runtime effect and ensure a default PSO is initialized.
Definition: runtime_effect_contents.cc:100
impeller::RuntimeEffectContents::SetRuntimeStage
void SetRuntimeStage(std::shared_ptr< RuntimeStage > runtime_stage)
Definition: runtime_effect_contents.cc:58
impeller::RuntimeEffectContents::SetTextureInputs
void SetTextureInputs(std::vector< TextureInput > texture_inputs)
Definition: runtime_effect_contents.cc:68
impeller::RuntimeEffectContents::SetUniformData
void SetUniformData(std::shared_ptr< std::vector< uint8_t >> uniform_data)
Definition: runtime_effect_contents.cc:63
impeller::raw_ptr
A wrapper around a raw ptr that adds additional unopt mode only checks.
Definition: raw_ptr.h:15
content_context.h
formats.h
impeller
Definition: allocation.cc:12
impeller::ToShaderStage
constexpr ShaderStage ToShaderStage(RuntimeShaderStage stage)
Definition: shader_types.h:29
impeller::MakeShaderMetadata
static std::unique_ptr< ShaderMetadata > MakeShaderMetadata(const RuntimeUniformDescription &uniform)
Definition: runtime_effect_contents.cc:84
impeller::PixelFormat
PixelFormat
The Pixel formats supported by Impeller. The naming convention denotes the usage of the component,...
Definition: formats.h:99
impeller::GetShaderType
static ShaderType GetShaderType(RuntimeUniformType type)
Definition: runtime_effect_contents.cc:73
impeller::ShaderStage::kFragment
@ kFragment
impeller::ShaderStage::kVertex
@ kVertex
impeller::VS
LinePipeline::VertexShader VS
Definition: line_contents.cc:13
impeller::ShaderType
ShaderType
Definition: shader_types.h:41
impeller::ShaderType::kStruct
@ kStruct
impeller::ShaderType::kFloat
@ kFloat
impeller::ShaderType::kSampledImage
@ kSampledImage
impeller::DescriptorType::kUniformBuffer
@ kUniformBuffer
impeller::DescriptorType::kSampledImage
@ kSampledImage
impeller::RuntimeUniformType
RuntimeUniformType
Definition: runtime_types.h:24
impeller::kSampledImage
@ kSampledImage
Definition: runtime_types.h:26
impeller::kFloat
@ kFloat
Definition: runtime_types.h:25
impeller::kStruct
@ kStruct
Definition: runtime_types.h:27
pipeline_library.h
render_pass.h
runtime_effect_contents.h
runtime_types.h
shader_function.h
shader_types.h
impeller::BufferView
Definition: buffer_view.h:19
impeller::ContentContextOptions
Definition: content_context.h:40
impeller::ContentContextOptions::color_attachment_pixel_format
PixelFormat color_attachment_pixel_format
Definition: content_context.h:98
impeller::RuntimeUniformDescription
Definition: runtime_types.h:41
impeller::RuntimeUniformDescription::dimensions
RuntimeUniformDimensions dimensions
Definition: runtime_types.h:47
impeller::RuntimeUniformDescription::struct_layout
std::vector< uint8_t > struct_layout
Definition: runtime_types.h:50
impeller::RuntimeUniformDescription::name
std::string name
Definition: runtime_types.h:42
impeller::RuntimeUniformDescription::type
RuntimeUniformType type
Definition: runtime_types.h:46
impeller::RuntimeUniformDescription::array_elements
std::optional< size_t > array_elements
Definition: runtime_types.h:49
impeller::RuntimeUniformDescription::bit_width
size_t bit_width
Definition: runtime_types.h:48
impeller::RuntimeUniformDimensions::cols
size_t cols
Definition: runtime_types.h:38
impeller::RuntimeUniformDimensions::rows
size_t rows
Definition: runtime_types.h:37
impeller::SampledImageSlot
Metadata required to bind a combined texture and sampler.
Definition: shader_types.h:98
impeller::SampledImageSlot::texture_index
size_t texture_index
ext_res_0 is the Metal binding value.
Definition: shader_types.h:103
impeller::SampledImageSlot::name
const char * name
The name of the uniform slot.
Definition: shader_types.h:100
impeller::SampledImageSlot::binding
size_t binding
The Vulkan binding value.
Definition: shader_types.h:109
impeller::ShaderStructMemberMetadata
Definition: shader_types.h:63
impeller::ShaderStructMemberMetadata::type
ShaderType type
Definition: shader_types.h:64
impeller::ShaderUniformSlot
Metadata required to bind a buffer.
Definition: shader_types.h:81
impeller::ShaderUniformSlot::binding
size_t binding
The Vulkan binding value.
Definition: shader_types.h:92
impeller::ShaderUniformSlot::ext_res_0
size_t ext_res_0
ext_res_0 is the Metal binding value.
Definition: shader_types.h:86
impeller::ShaderUniformSlot::name
const char * name
The name of the uniform slot.
Definition: shader_types.h:83
validation.h
VALIDATION_LOG
#define VALIDATION_LOG
Definition: validation.h:91
vertex_descriptor.h