| Flutter Impeller |

radial_gradient_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 "radial_gradient_contents.h"
6
7 #include "impeller/entity/contents/clip_contents.h"
8 #include "impeller/entity/contents/content_context.h"
9 #include "impeller/entity/contents/gradient_generator.h"
10 #include "impeller/entity/entity.h"
11 #include "impeller/entity/geometry/geometry.h"
12 #include "impeller/geometry/gradient.h"
13 #include "impeller/renderer/render_pass.h"
14
15 namespace impeller {
16
17 RadialGradientContents::RadialGradientContents() = default;
18
19 RadialGradientContents::~RadialGradientContents() = default;
20
21 void RadialGradientContents::SetCenterAndRadius(Point center, Scalar radius) {
22 center_ = center;
23 radius_ = radius;
24 }
25
26 void RadialGradientContents::SetTileMode(Entity::TileMode tile_mode) {
27 tile_mode_ = tile_mode;
28 }
29
30 void RadialGradientContents::SetColors(std::vector<Color> colors) {
31 colors_ = std::move(colors);
32 }
33
34 void RadialGradientContents::SetStops(std::vector<Scalar> stops) {
35 stops_ = std::move(stops);
36 }
37
38 const std::vector<Color>& RadialGradientContents::GetColors() const {
39 return colors_;
40 }
41
42 const std::vector<Scalar>& RadialGradientContents::GetStops() const {
43 return stops_;
44 }
45
46 bool RadialGradientContents::IsOpaque() const {
47 if (GetOpacityFactor() < 1 || tile_mode_ == Entity::TileMode::kDecal) {
48 return false;
49 }
50 for (auto color : colors_) {
51 if (!color.IsOpaque()) {
52 return false;
53 }
54 }
55 return true;
56 }
57
58 bool RadialGradientContents::Render(const ContentContext& renderer,
59 const Entity& entity,
60 RenderPass& pass) const {
61 if (renderer.GetDeviceCapabilities().SupportsSSBO()) {
62 return RenderSSBO(renderer, entity, pass);
63 }
64 return RenderTexture(renderer, entity, pass);
65 }
66
67 bool RadialGradientContents::RenderSSBO(const ContentContext& renderer,
68 const Entity& entity,
69 RenderPass& pass) const {
70 using VS = RadialGradientSSBOFillPipeline::VertexShader;
71 using FS = RadialGradientSSBOFillPipeline::FragmentShader;
72
73 VS::FrameInfo frame_info;
74 frame_info.matrix = GetInverseEffectTransform();
75
76 PipelineBuilderCallback pipeline_callback =
77 [&renderer](ContentContextOptions options) {
78 return renderer.GetRadialGradientSSBOFillPipeline(options);
79 };
80 return ColorSourceContents::DrawGeometry<VS>(
81 renderer, entity, pass, pipeline_callback, frame_info,
82 [this, &renderer](RenderPass& pass) {
83 FS::FragInfo frag_info;
84 frag_info.center = center_;
85 frag_info.radius = radius_;
86 frag_info.tile_mode = static_cast<Scalar>(tile_mode_);
87 frag_info.decal_border_color = decal_border_color_;
88 frag_info.alpha = GetOpacityFactor();
89
90 auto& host_buffer = renderer.GetTransientsBuffer();
91 auto colors = CreateGradientColors(colors_, stops_);
92
93 frag_info.colors_length = colors.size();
94 auto color_buffer =
95 host_buffer.Emplace(colors.data(), colors.size() * sizeof(StopData),
96 DefaultUniformAlignment());
97
98 pass.SetCommandLabel("RadialGradientSSBOFill");
99 FS::BindFragInfo(
100 pass, renderer.GetTransientsBuffer().EmplaceUniform(frag_info));
101 FS::BindColorData(pass, color_buffer);
102
103 return true;
104 });
105 }
106
107 bool RadialGradientContents::RenderTexture(const ContentContext& renderer,
108 const Entity& entity,
109 RenderPass& pass) const {
110 using VS = RadialGradientFillPipeline::VertexShader;
111 using FS = RadialGradientFillPipeline::FragmentShader;
112
113 auto gradient_data = CreateGradientBuffer(colors_, stops_);
114 auto gradient_texture =
115 CreateGradientTexture(gradient_data, renderer.GetContext());
116 if (gradient_texture == nullptr) {
117 return false;
118 }
119
120 VS::FrameInfo frame_info;
121 frame_info.matrix = GetInverseEffectTransform();
122
123 PipelineBuilderCallback pipeline_callback =
124 [&renderer](ContentContextOptions options) {
125 return renderer.GetRadialGradientFillPipeline(options);
126 };
127 return ColorSourceContents::DrawGeometry<VS>(
128 renderer, entity, pass, pipeline_callback, frame_info,
129 [this, &renderer, &gradient_texture](RenderPass& pass) {
130 FS::FragInfo frag_info;
131 frag_info.center = center_;
132 frag_info.radius = radius_;
133 frag_info.tile_mode = static_cast<Scalar>(tile_mode_);
134 frag_info.decal_border_color = decal_border_color_;
135 frag_info.texture_sampler_y_coord_scale =
136 gradient_texture->GetYCoordScale();
137 frag_info.alpha = GetOpacityFactor();
138 frag_info.half_texel =
139 Vector2(0.5 / gradient_texture->GetSize().width,
140 0.5 / gradient_texture->GetSize().height);
141
142 SamplerDescriptor sampler_desc;
143 sampler_desc.min_filter = MinMagFilter::kLinear;
144 sampler_desc.mag_filter = MinMagFilter::kLinear;
145
146 pass.SetCommandLabel("RadialGradientFill");
147
148 FS::BindFragInfo(
149 pass, renderer.GetTransientsBuffer().EmplaceUniform(frag_info));
150 FS::BindTextureSampler(
151 pass, gradient_texture,
152 renderer.GetContext()->GetSamplerLibrary()->GetSampler(
153 sampler_desc));
154
155 return true;
156 });
157 }
158
159 bool RadialGradientContents::ApplyColorFilter(
160 const ColorFilterProc& color_filter_proc) {
161 for (Color& color : colors_) {
162 color = color_filter_proc(color);
163 }
164 decal_border_color_ = color_filter_proc(decal_border_color_);
165 return true;
166 }
167
168 } // namespace impeller
impeller::ColorSourceContents::PipelineBuilderCallback
std::function< std::shared_ptr< Pipeline< PipelineDescriptor > >(ContentContextOptions)> PipelineBuilderCallback
Definition: color_source_contents.h:113
impeller::ColorSourceContents::GetOpacityFactor
Scalar GetOpacityFactor() const
Get the opacity factor for this color source.
Definition: color_source_contents.cc:28
impeller::RadialGradientContents::SetCenterAndRadius
void SetCenterAndRadius(Point center, Scalar radius)
Definition: radial_gradient_contents.cc:21
gradient_generator.h
impeller::Scalar
float Scalar
Definition: scalar.h:18
impeller::DefaultUniformAlignment
constexpr size_t DefaultUniformAlignment()
Definition: platform.h:15
impeller::RadialGradientContents::SetStops
void SetStops(std::vector< Scalar > stops)
Definition: radial_gradient_contents.cc:34
entity.h
impeller::RadialGradientContents::GetStops
const std::vector< Scalar > & GetStops() const
Definition: radial_gradient_contents.cc:42
impeller::Color
Definition: color.h:124
impeller::RadialGradientContents::~RadialGradientContents
~RadialGradientContents() override
impeller::Entity::TileMode::kDecal
@ kDecal
impeller::Vector2
Point Vector2
Definition: point.h:320
impeller::RenderPipelineT::FragmentShader
FragmentShader_ FragmentShader
Definition: pipeline.h:94
impeller::Color::alpha
Scalar alpha
Definition: color.h:143
impeller::RadialGradientContents::IsOpaque
bool IsOpaque() const override
Whether this Contents only emits opaque source colors from the fragment stage. This value does not ac...
Definition: radial_gradient_contents.cc:46
gradient.h
impeller::RadialGradientContents::Render
bool Render(const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
Definition: radial_gradient_contents.cc:58
impeller::VS
SolidFillVertexShader VS
Definition: stroke_path_geometry.cc:15
impeller::Entity
Definition: entity.h:21
render_pass.h
impeller::Contents::ColorFilterProc
std::function< Color(Color)> ColorFilterProc
Definition: contents.h:38
impeller::MinMagFilter::kLinear
@ kLinear
impeller::RadialGradientContents::GetColors
const std::vector< Color > & GetColors() const
Definition: radial_gradient_contents.cc:38
geometry.h
clip_contents.h
impeller::CreateGradientBuffer
GradientData CreateGradientBuffer(const std::vector< Color > &colors, const std::vector< Scalar > &stops)
Populate a vector with the interpolated color bytes for the linear gradient described by colors and s...
Definition: gradient.cc:20
impeller::Entity::TileMode
TileMode
Definition: entity.h:42
impeller::RadialGradientContents::RadialGradientContents
RadialGradientContents()
impeller::RadialGradientContents::ApplyColorFilter
bool ApplyColorFilter(const ColorFilterProc &color_filter_proc) override
If possible, applies a color filter to this contents inputs on the CPU.
Definition: radial_gradient_contents.cc:159
impeller::RenderPass
Render passes encode render commands directed as one specific render target into an underlying comman...
Definition: render_pass.h:33
content_context.h
impeller::ContentContext::GetDeviceCapabilities
const Capabilities & GetDeviceCapabilities() const
Definition: content_context.cc:568
impeller::RadialGradientContents::SetTileMode
void SetTileMode(Entity::TileMode tile_mode)
Definition: radial_gradient_contents.cc:26
impeller::TPoint< Scalar >
impeller::HostBuffer::EmplaceUniform
BufferView EmplaceUniform(const UniformType &uniform)
Emplace uniform data onto the host buffer. Ensure that backend specific uniform alignment requirement...
Definition: host_buffer.h:50
impeller::ContentContext::GetRadialGradientSSBOFillPipeline
std::shared_ptr< Pipeline< PipelineDescriptor > > GetRadialGradientSSBOFillPipeline(ContentContextOptions opts) const
Definition: content_context.h:438
radial_gradient_contents.h
impeller::CreateGradientColors
std::vector< StopData > CreateGradientColors(const std::vector< Color > &colors, const std::vector< Scalar > &stops)
Populate a vector with the color and stop data for a gradient.
Definition: gradient_generator.cc:45
impeller::CreateGradientTexture
std::shared_ptr< Texture > CreateGradientTexture(const GradientData &gradient_data, const std::shared_ptr< impeller::Context > &context)
Create a host visible texture that contains the gradient defined by the provided gradient data.
Definition: gradient_generator.cc:17
impeller::RenderPipelineT::VertexShader
VertexShader_ VertexShader
Definition: pipeline.h:93
impeller::ContentContextOptions
Definition: content_context.h:288
impeller::Capabilities::SupportsSSBO
virtual bool SupportsSSBO() const =0
Whether the context backend supports binding Shader Storage Buffer Objects (SSBOs) to pipelines.
impeller::RadialGradientContents::SetColors
void SetColors(std::vector< Color > colors)
Definition: radial_gradient_contents.cc:30
impeller
Definition: aiks_blur_unittests.cc:20
impeller::ContentContext
Definition: content_context.h:392
impeller::ColorSourceContents::GetInverseEffectTransform
const Matrix & GetInverseEffectTransform() const
Set the inverted effect transform for this color source.
Definition: color_source_contents.cc:36
impeller::ContentContext::GetTransientsBuffer
HostBuffer & GetTransientsBuffer() const
Retrieve the currnent host buffer for transient storage.
Definition: content_context.h:833