| Flutter Impeller |

texture_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/texture_contents.h"
6
7 #include <memory>
8 #include <optional>
9 #include <utility>
10
11 #include "impeller/core/formats.h"
12 #include "impeller/entity/contents/content_context.h"
13 #include "impeller/entity/entity.h"
14 #include "impeller/entity/texture_fill.frag.h"
15 #include "impeller/entity/texture_fill.vert.h"
16 #include "impeller/entity/texture_fill_strict_src.frag.h"
17 #include "impeller/entity/tiled_texture_fill_external.frag.h"
18 #include "impeller/geometry/constants.h"
19 #include "impeller/renderer/render_pass.h"
20 #include "impeller/renderer/vertex_buffer_builder.h"
21
22 namespace impeller {
23
24 TextureContents::TextureContents() = default;
25
26 TextureContents::~TextureContents() = default;
27
28 std::shared_ptr<TextureContents> TextureContents::MakeRect(Rect destination) {
29 auto contents = std::make_shared<TextureContents>();
30 contents->destination_rect_ = destination;
31 return contents;
32 }
33
34 void TextureContents::SetLabel(std::string_view label) {
35 label_ = label;
36 }
37
38 void TextureContents::SetDestinationRect(Rect rect) {
39 destination_rect_ = rect;
40 }
41
42 void TextureContents::SetTexture(std::shared_ptr<Texture> texture) {
43 texture_ = std::move(texture);
44 }
45
46 std::shared_ptr<Texture> TextureContents::GetTexture() const {
47 return texture_;
48 }
49
50 void TextureContents::SetOpacity(Scalar opacity) {
51 opacity_ = opacity;
52 }
53
54 void TextureContents::SetStencilEnabled(bool enabled) {
55 stencil_enabled_ = enabled;
56 }
57
58 void TextureContents::SetInheritedOpacity(Scalar opacity) {
59 inherited_opacity_ = opacity;
60 }
61
62 Scalar TextureContents::GetOpacity() const {
63 return opacity_ * inherited_opacity_;
64 }
65
66 std::optional<Rect> TextureContents::GetCoverage(const Entity& entity) const {
67 if (GetOpacity() == 0) {
68 return std::nullopt;
69 }
70 return destination_rect_.TransformBounds(entity.GetTransform());
71 };
72
73 std::optional<Snapshot> TextureContents::RenderToSnapshot(
74 const ContentContext& renderer,
75 const Entity& entity,
76 std::optional<Rect> coverage_limit,
77 const std::optional<SamplerDescriptor>& sampler_descriptor,
78 bool msaa_enabled,
79 int32_t mip_count,
80 std::string_view label) const {
81 // Passthrough textures that have simple rectangle paths and complete source
82 // rects.
83 auto bounds = destination_rect_;
84 auto opacity = GetOpacity();
85 if (source_rect_ == Rect::MakeSize(texture_->GetSize()) &&
86 (opacity >= 1 - kEhCloseEnough || defer_applying_opacity_)) {
87 auto scale = Vector2(bounds.GetSize() / Size(texture_->GetSize()));
88 return Snapshot{
89 .texture = texture_,
90 .transform = entity.GetTransform() *
91 Matrix::MakeTranslation(bounds.GetOrigin()) *
92 Matrix::MakeScale(scale),
93 .sampler_descriptor = sampler_descriptor.value_or(sampler_descriptor_),
94 .opacity = opacity};
95 }
96 return Contents::RenderToSnapshot(
97 renderer, // renderer
98 entity, // entity
99 std::nullopt, // coverage_limit
100 sampler_descriptor.value_or(sampler_descriptor_), // sampler_descriptor
101 true, // msaa_enabled
102 /*mip_count=*/mip_count,
103 label); // label
104 }
105
106 bool TextureContents::Render(const ContentContext& renderer,
107 const Entity& entity,
108 RenderPass& pass) const {
109 using VS = TextureFillVertexShader;
110 using FS = TextureFillFragmentShader;
111 using FSStrict = TextureFillStrictSrcFragmentShader;
112
113 if (destination_rect_.IsEmpty() || source_rect_.IsEmpty() ||
114 texture_ == nullptr || texture_->GetSize().IsEmpty()) {
115 return true; // Nothing to render.
116 }
117
118 #ifdef IMPELLER_ENABLE_OPENGLES
119 using FSExternal = TiledTextureFillExternalFragmentShader;
120 bool is_external_texture =
121 texture_->GetTextureDescriptor().type == TextureType::kTextureExternalOES;
122 #endif // IMPELLER_ENABLE_OPENGLES
123
124 auto texture_coords =
125 Rect::MakeSize(texture_->GetSize()).Project(source_rect_);
126 auto& host_buffer = renderer.GetTransientsBuffer();
127
128 std::array<VS::PerVertexData, 4> vertices = {
129 VS::PerVertexData{destination_rect_.GetLeftTop(),
130 texture_coords.GetLeftTop()},
131 VS::PerVertexData{destination_rect_.GetRightTop(),
132 texture_coords.GetRightTop()},
133 VS::PerVertexData{destination_rect_.GetLeftBottom(),
134 texture_coords.GetLeftBottom()},
135 VS::PerVertexData{destination_rect_.GetRightBottom(),
136 texture_coords.GetRightBottom()},
137 };
138 auto vertex_buffer = CreateVertexBuffer(vertices, host_buffer);
139
140 VS::FrameInfo frame_info;
141 frame_info.mvp = entity.GetShaderTransform(pass);
142 frame_info.texture_sampler_y_coord_scale = texture_->GetYCoordScale();
143
144 #ifdef IMPELLER_DEBUG
145 if (label_.empty()) {
146 pass.SetCommandLabel("Texture Fill");
147 } else {
148 pass.SetCommandLabel("Texture Fill: " + label_);
149 }
150 #endif // IMPELLER_DEBUG
151
152 auto pipeline_options = OptionsFromPassAndEntity(pass, entity);
153 if (!stencil_enabled_) {
154 pipeline_options.stencil_mode = ContentContextOptions::StencilMode::kIgnore;
155 }
156 pipeline_options.primitive_type = PrimitiveType::kTriangleStrip;
157
158 pipeline_options.depth_write_enabled =
159 stencil_enabled_ && pipeline_options.blend_mode == BlendMode::kSrc;
160
161 #ifdef IMPELLER_ENABLE_OPENGLES
162 if (is_external_texture) {
163 pass.SetPipeline(
164 renderer.GetTiledTextureExternalPipeline(pipeline_options));
165 } else {
166 pass.SetPipeline(
167 strict_source_rect_enabled_
168 ? renderer.GetTextureStrictSrcPipeline(pipeline_options)
169 : renderer.GetTexturePipeline(pipeline_options));
170 }
171 #else
172 pass.SetPipeline(strict_source_rect_enabled_
173 ? renderer.GetTextureStrictSrcPipeline(pipeline_options)
174 : renderer.GetTexturePipeline(pipeline_options));
175 #endif // IMPELLER_ENABLE_OPENGLES
176
177 pass.SetVertexBuffer(vertex_buffer);
178 VS::BindFrameInfo(pass, host_buffer.EmplaceUniform(frame_info));
179
180 if (strict_source_rect_enabled_) {
181 // For a strict source rect, shrink the texture coordinate range by half a
182 // texel to ensure that linear filtering does not sample anything outside
183 // the source rect bounds.
184 auto strict_texture_coords =
185 Rect::MakeSize(texture_->GetSize()).Project(source_rect_.Expand(-0.5));
186
187 FSStrict::FragInfo frag_info;
188 frag_info.source_rect = Vector4(strict_texture_coords.GetLTRB());
189 frag_info.alpha = GetOpacity();
190 FSStrict::BindFragInfo(pass, host_buffer.EmplaceUniform((frag_info)));
191 FSStrict::BindTextureSampler(
192 pass, texture_,
193 renderer.GetContext()->GetSamplerLibrary()->GetSampler(
194 sampler_descriptor_));
195 #ifdef IMPELLER_ENABLE_OPENGLES
196 } else if (is_external_texture) {
197 FSExternal::FragInfo frag_info;
198 frag_info.x_tile_mode =
199 static_cast<Scalar>(sampler_descriptor_.width_address_mode);
200 frag_info.y_tile_mode =
201 static_cast<Scalar>(sampler_descriptor_.height_address_mode);
202 frag_info.alpha = GetOpacity();
203 FSExternal::BindFragInfo(pass, host_buffer.EmplaceUniform(frag_info));
204
205 SamplerDescriptor sampler_desc;
206 // OES_EGL_image_external states that only CLAMP_TO_EDGE is valid, so
207 // we emulate all other tile modes here by remapping the texture
208 // coordinates.
209 sampler_desc.width_address_mode = SamplerAddressMode::kClampToEdge;
210 sampler_desc.height_address_mode = SamplerAddressMode::kClampToEdge;
211 sampler_desc.min_filter = sampler_descriptor_.min_filter;
212 sampler_desc.mag_filter = sampler_descriptor_.mag_filter;
213 sampler_desc.mip_filter = MipFilter::kBase;
214
215 FSExternal::BindSAMPLEREXTERNALOESTextureSampler(
216 pass, texture_,
217 renderer.GetContext()->GetSamplerLibrary()->GetSampler(sampler_desc));
218 #endif // IMPELLER_ENABLE_OPENGLES
219 } else {
220 FS::FragInfo frag_info;
221 frag_info.alpha = GetOpacity();
222 FS::BindFragInfo(pass, host_buffer.EmplaceUniform((frag_info)));
223 FS::BindTextureSampler(
224 pass, texture_,
225 renderer.GetContext()->GetSamplerLibrary()->GetSampler(
226 sampler_descriptor_));
227 }
228 return pass.Draw().ok();
229 }
230
231 void TextureContents::SetSourceRect(const Rect& source_rect) {
232 source_rect_ = source_rect;
233 }
234
235 const Rect& TextureContents::GetSourceRect() const {
236 return source_rect_;
237 }
238
239 void TextureContents::SetStrictSourceRect(bool strict) {
240 strict_source_rect_enabled_ = strict;
241 }
242
243 bool TextureContents::GetStrictSourceRect() const {
244 return strict_source_rect_enabled_;
245 }
246
247 void TextureContents::SetSamplerDescriptor(const SamplerDescriptor& desc) {
248 sampler_descriptor_ = desc;
249 }
250
251 const SamplerDescriptor& TextureContents::GetSamplerDescriptor() const {
252 return sampler_descriptor_;
253 }
254
255 void TextureContents::SetDeferApplyingOpacity(bool defer_applying_opacity) {
256 defer_applying_opacity_ = defer_applying_opacity;
257 }
258
259 } // namespace impeller
impeller::ContentContext
Definition: content_context.h:138
impeller::ContentContext::GetTransientsBuffer
HostBuffer & GetTransientsBuffer() const
Retrieve the currnent host buffer for transient storage.
Definition: content_context.h:296
impeller::ContentContext::GetTextureStrictSrcPipeline
PipelineRef GetTextureStrictSrcPipeline(ContentContextOptions opts) const
Definition: content_context.cc:1075
impeller::ContentContext::GetTexturePipeline
PipelineRef GetTexturePipeline(ContentContextOptions opts) const
Definition: content_context.cc:1070
impeller::ContentContext::GetContext
std::shared_ptr< Context > GetContext() const
Definition: content_context.cc:913
impeller::Contents::RenderToSnapshot
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, std::string_view label="Snapshot") const
Render this contents to a snapshot, respecting the entity's transform, path, clip depth,...
Definition: contents.cc:56
impeller::Entity
Definition: entity.h:20
impeller::Entity::GetShaderTransform
Matrix GetShaderTransform(const RenderPass &pass) const
Get the vertex shader transform used for drawing this Entity.
Definition: entity.cc:48
impeller::Entity::GetTransform
const Matrix & GetTransform() const
Get the global transform matrix for this Entity.
Definition: entity.cc:44
impeller::RenderPass
Render passes encode render commands directed as one specific render target into an underlying comman...
Definition: render_pass.h:30
impeller::RenderPass::SetVertexBuffer
virtual bool SetVertexBuffer(VertexBuffer buffer)
Specify the vertex and index buffer to use for this command.
Definition: render_pass.cc:127
impeller::RenderPass::SetPipeline
virtual void SetPipeline(PipelineRef pipeline)
The pipeline to use for this command.
Definition: render_pass.cc:86
impeller::RenderPass::Draw
virtual fml::Status Draw()
Record the currently pending command.
Definition: render_pass.cc:208
impeller::RenderPass::SetCommandLabel
virtual void SetCommandLabel(std::string_view label)
The debugging label to use for the command.
Definition: render_pass.cc:97
impeller::TextureContents::GetTexture
std::shared_ptr< Texture > GetTexture() const
Definition: texture_contents.cc:46
impeller::TextureContents::SetSourceRect
void SetSourceRect(const Rect &source_rect)
Definition: texture_contents.cc:231
impeller::TextureContents::Render
bool Render(const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
Definition: texture_contents.cc:106
impeller::TextureContents::SetSamplerDescriptor
void SetSamplerDescriptor(const SamplerDescriptor &desc)
Definition: texture_contents.cc:247
impeller::TextureContents::GetOpacity
Scalar GetOpacity() const
Definition: texture_contents.cc:62
impeller::TextureContents::SetStrictSourceRect
void SetStrictSourceRect(bool strict)
Definition: texture_contents.cc:239
impeller::TextureContents::SetDeferApplyingOpacity
void SetDeferApplyingOpacity(bool defer_applying_opacity)
Definition: texture_contents.cc:255
impeller::TextureContents::GetSamplerDescriptor
const SamplerDescriptor & GetSamplerDescriptor() const
Definition: texture_contents.cc:251
impeller::TextureContents::SetOpacity
void SetOpacity(Scalar opacity)
Definition: texture_contents.cc:50
impeller::TextureContents::RenderToSnapshot
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, std::string_view label="Texture Snapshot") const override
Render this contents to a snapshot, respecting the entity's transform, path, clip depth,...
Definition: texture_contents.cc:73
impeller::TextureContents::GetStrictSourceRect
bool GetStrictSourceRect() const
Definition: texture_contents.cc:243
impeller::TextureContents::MakeRect
static std::shared_ptr< TextureContents > MakeRect(Rect destination)
A common case factory that marks the texture contents as having a destination rectangle....
Definition: texture_contents.cc:28
impeller::TextureContents::GetSourceRect
const Rect & GetSourceRect() const
Definition: texture_contents.cc:235
impeller::TextureContents::SetInheritedOpacity
void SetInheritedOpacity(Scalar opacity) override
Inherit the provided opacity.
Definition: texture_contents.cc:58
impeller::TextureContents::TextureContents
TextureContents()
impeller::TextureContents::GetCoverage
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.
Definition: texture_contents.cc:66
impeller::TextureContents::SetTexture
void SetTexture(std::shared_ptr< Texture > texture)
Definition: texture_contents.cc:42
impeller::TextureContents::~TextureContents
~TextureContents() override
impeller::TextureContents::SetLabel
void SetLabel(std::string_view label)
Definition: texture_contents.cc:34
impeller::TextureContents::SetStencilEnabled
void SetStencilEnabled(bool enabled)
Definition: texture_contents.cc:54
impeller::TextureContents::SetDestinationRect
void SetDestinationRect(Rect rect)
Definition: texture_contents.cc:38
content_context.h
formats.h
entity.h
constants.h
impeller
Definition: allocation.cc:12
impeller::PrimitiveType::kTriangleStrip
@ kTriangleStrip
impeller::Vector2
Point Vector2
Definition: point.h:331
impeller::Scalar
float Scalar
Definition: scalar.h:18
impeller::SamplerAddressMode::kClampToEdge
@ kClampToEdge
impeller::kEhCloseEnough
constexpr float kEhCloseEnough
Definition: constants.h:57
impeller::FS
LinePipeline::FragmentShader FS
Definition: line_contents.cc:14
impeller::MipFilter::kBase
@ kBase
The texture is sampled as if it only had a single mipmap level.
impeller::CreateVertexBuffer
VertexBuffer CreateVertexBuffer(std::array< VertexType, size > input, HostBuffer &host_buffer)
Create an index-less vertex buffer from a fixed size array.
Definition: vertex_buffer_builder.h:24
impeller::TextureType::kTextureExternalOES
@ kTextureExternalOES
impeller::BlendMode::kSrc
@ kSrc
impeller::VS
LinePipeline::VertexShader VS
Definition: line_contents.cc:13
impeller::OptionsFromPassAndEntity
ContentContextOptions OptionsFromPassAndEntity(const RenderPass &pass, const Entity &entity)
Definition: contents.cc:34
render_pass.h
scale
const Scalar scale
Definition: stroke_path_geometry.cc:319
impeller::ContentContextOptions::StencilMode::kIgnore
@ kIgnore
impeller::Matrix::MakeTranslation
static constexpr Matrix MakeTranslation(const Vector3 &t)
Definition: matrix.h:95
impeller::Matrix::MakeScale
static constexpr Matrix MakeScale(const Vector3 &s)
Definition: matrix.h:104
impeller::SamplerDescriptor
Definition: sampler_descriptor.h:14
impeller::SamplerDescriptor::mip_filter
MipFilter mip_filter
Definition: sampler_descriptor.h:17
impeller::SamplerDescriptor::width_address_mode
SamplerAddressMode width_address_mode
Definition: sampler_descriptor.h:19
impeller::SamplerDescriptor::height_address_mode
SamplerAddressMode height_address_mode
Definition: sampler_descriptor.h:20
impeller::SamplerDescriptor::mag_filter
MinMagFilter mag_filter
Definition: sampler_descriptor.h:16
impeller::SamplerDescriptor::min_filter
MinMagFilter min_filter
Definition: sampler_descriptor.h:15
impeller::Snapshot
Represents a texture and its intended draw transform/sampler configuration.
Definition: snapshot.h:24
impeller::Snapshot::texture
std::shared_ptr< Texture > texture
Definition: snapshot.h:25
impeller::TRect< Scalar >
impeller::TRect::Expand
constexpr TRect< T > Expand(T left, T top, T right, T bottom) const
Returns a rectangle with expanded edges. Negative expansion results in shrinking.
Definition: rect.h:622
impeller::TRect::TransformBounds
constexpr TRect TransformBounds(const Matrix &transform) const
Creates a new bounding box that contains this transformed rectangle.
Definition: rect.h:476
impeller::TRect::Project
constexpr TRect< T > Project(TRect< T > source) const
Returns a new rectangle that represents the projection of the source rectangle onto this rectangle....
Definition: rect.h:673
impeller::TRect::IsEmpty
constexpr bool IsEmpty() const
Returns true if either of the width or height are 0, negative, or NaN.
Definition: rect.h:301
impeller::TRect::GetLeftBottom
constexpr TPoint< T > GetLeftBottom() const
Definition: rect.h:371
impeller::TRect::GetRightTop
constexpr TPoint< T > GetRightTop() const
Definition: rect.h:367
impeller::TRect< Scalar >::MakeSize
constexpr static TRect MakeSize(const TSize< U > &size)
Definition: rect.h:150
impeller::TRect::GetRightBottom
constexpr TPoint< T > GetRightBottom() const
Definition: rect.h:375
impeller::TRect::GetLeftTop
constexpr TPoint< T > GetLeftTop() const
Definition: rect.h:363
impeller::TSize< Scalar >
impeller::Vector4
Definition: vector.h:232
texture_contents.h
vertex_buffer_builder.h