Flutter Impeller
framebuffer_blend_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 
6 
9 
10 namespace impeller {
11 
13 
15 
17  blend_mode_ = blend_mode;
18 }
19 
21  std::shared_ptr<Contents> child_contents) {
22  child_contents_ = std::move(child_contents);
23 }
24 
25 // |Contents|
26 std::optional<Rect> FramebufferBlendContents::GetCoverage(
27  const Entity& entity) const {
28  return child_contents_->GetCoverage(entity);
29 }
30 
31 bool FramebufferBlendContents::Render(const ContentContext& renderer,
32  const Entity& entity,
33  RenderPass& pass) const {
34  if (!renderer.GetDeviceCapabilities().SupportsFramebufferFetch()) {
35  return false;
36  }
37 
40 
41  auto& host_buffer = renderer.GetTransientsBuffer();
42 
43  auto src_snapshot = child_contents_->RenderToSnapshot(
44  renderer, // renderer
45  entity, // entity
46  Rect::MakeSize(pass.GetRenderTargetSize()), // coverage_limit
47  std::nullopt, // sampler_descriptor
48  true, // msaa_enabled
49  /*mip_count=*/1,
50  "FramebufferBlendContents Snapshot"); // label
51 
52  if (!src_snapshot.has_value()) {
53  return true;
54  }
55 
56  auto size = src_snapshot->texture->GetSize();
57 
58  std::array<VS::PerVertexData, 4> vertices = {
59  VS::PerVertexData{Point(0, 0), Point(0, 0)},
60  VS::PerVertexData{Point(size.width, 0), Point(1, 0)},
61  VS::PerVertexData{Point(0, size.height), Point(0, 1)},
62  VS::PerVertexData{Point(size.width, size.height), Point(1, 1)},
63  };
64 
65  auto options = OptionsFromPass(pass);
66  options.blend_mode = BlendMode::kSrc;
67  options.primitive_type = PrimitiveType::kTriangleStrip;
68 
69  pass.SetCommandLabel("Framebuffer Advanced Blend Filter");
70  pass.SetVertexBuffer(
71  CreateVertexBuffer(vertices, renderer.GetTransientsBuffer()));
72 
73  switch (blend_mode_) {
74  case BlendMode::kScreen:
75  pass.SetPipeline(renderer.GetFramebufferBlendScreenPipeline(options));
76  break;
78  pass.SetPipeline(renderer.GetFramebufferBlendOverlayPipeline(options));
79  break;
80  case BlendMode::kDarken:
81  pass.SetPipeline(renderer.GetFramebufferBlendDarkenPipeline(options));
82  break;
84  pass.SetPipeline(renderer.GetFramebufferBlendLightenPipeline(options));
85  break;
87  pass.SetPipeline(renderer.GetFramebufferBlendColorDodgePipeline(options));
88  break;
90  pass.SetPipeline(renderer.GetFramebufferBlendColorBurnPipeline(options));
91  break;
93  pass.SetPipeline(renderer.GetFramebufferBlendHardLightPipeline(options));
94  break;
96  pass.SetPipeline(renderer.GetFramebufferBlendSoftLightPipeline(options));
97  break;
99  pass.SetPipeline(renderer.GetFramebufferBlendDifferencePipeline(options));
100  break;
102  pass.SetPipeline(renderer.GetFramebufferBlendExclusionPipeline(options));
103  break;
105  pass.SetPipeline(renderer.GetFramebufferBlendMultiplyPipeline(options));
106  break;
107  case BlendMode::kHue:
108  pass.SetPipeline(renderer.GetFramebufferBlendHuePipeline(options));
109  break;
111  pass.SetPipeline(renderer.GetFramebufferBlendSaturationPipeline(options));
112  break;
113  case BlendMode::kColor:
114  pass.SetPipeline(renderer.GetFramebufferBlendColorPipeline(options));
115  break;
117  pass.SetPipeline(renderer.GetFramebufferBlendLuminosityPipeline(options));
118  break;
119  default:
120  return false;
121  }
122 
123  VS::FrameInfo frame_info;
124  FS::FragInfo frag_info;
125 
126  auto src_sampler_descriptor = src_snapshot->sampler_descriptor;
127  if (renderer.GetDeviceCapabilities().SupportsDecalSamplerAddressMode()) {
128  src_sampler_descriptor.width_address_mode = SamplerAddressMode::kDecal;
129  src_sampler_descriptor.height_address_mode = SamplerAddressMode::kDecal;
130  }
131  raw_ptr<const Sampler> src_sampler =
132  renderer.GetContext()->GetSamplerLibrary()->GetSampler(
133  src_sampler_descriptor);
134  FS::BindTextureSamplerSrc(pass, src_snapshot->texture, src_sampler);
135 
136  frame_info.mvp = Entity::GetShaderTransform(entity.GetShaderClipDepth(), pass,
137  src_snapshot->transform);
138  frame_info.src_y_coord_scale = src_snapshot->texture->GetYCoordScale();
139  VS::BindFrameInfo(pass, host_buffer.EmplaceUniform(frame_info));
140 
141  frag_info.src_input_alpha = src_snapshot->opacity;
142  frag_info.dst_input_alpha = 1.0;
143  FS::BindFragInfo(pass, host_buffer.EmplaceUniform(frag_info));
144 
145  return pass.Draw().ok();
146 }
147 
148 } // namespace impeller
Matrix GetShaderTransform(const RenderPass &pass) const
Definition: entity.cc:48
void SetChildContents(std::shared_ptr< Contents > child_contents)
FragmentShader_ FragmentShader
Definition: pipeline.h:164
@ kDecal
decal sampling mode is only supported on devices that pass the Capabilities.SupportsDecalSamplerAddre...
TPoint< Scalar > Point
Definition: point.h:327
LinePipeline::FragmentShader FS
VertexBuffer CreateVertexBuffer(std::array< VertexType, size > input, HostBuffer &host_buffer)
Create an index-less vertex buffer from a fixed size array.
BlendMode
Definition: color.h:58
LinePipeline::VertexShader VS
ContentContextOptions OptionsFromPass(const RenderPass &pass)
Definition: contents.cc:19
constexpr static TRect MakeSize(const TSize< U > &size)
Definition: rect.h:150