A geometry that is created from a vertices object. More...

#include <vertices_geometry.h>

Inheritance diagram for impeller::VerticesGeometry:

Public Types
enum class	VertexMode { kTriangles , kTriangleStrip , kTriangleFan }

Public Member Functions
	VerticesGeometry (std::vector< Point > vertices, std::vector< uint16_t > indices, std::vector< Point > texture_coordinates, std::vector< Color > colors, Rect bounds, VerticesGeometry::VertexMode vertex_mode)

	~VerticesGeometry ()=default

GeometryResult	GetPositionUVColorBuffer (Rect texture_coverage, Matrix effect_transform, const ContentContext &renderer, const Entity &entity, RenderPass &pass) const

GeometryResult	GetPositionBuffer (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override

std::optional< Rect >	GetCoverage (const Matrix &transform) const override

bool	HasVertexColors () const

bool	HasTextureCoordinates () const

std::optional< Rect >	GetTextureCoordinateCoverge () const

Public Member Functions inherited from impeller::Geometry
virtual GeometryResult	GetPositionBuffer (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const =0

virtual GeometryResult::Mode	GetResultMode () const

virtual std::optional< Rect >	GetCoverage (const Matrix &transform) const =0

virtual bool	CoversArea (const Matrix &transform, const Rect &rect) const
	Determines if this geometry, transformed by the given `transform`, will completely cover all surface area of the given `rect`. More...

virtual bool	IsAxisAlignedRect () const

virtual bool	CanApplyMaskFilter () const

virtual Scalar	ComputeAlphaCoverage (const Entity &entitys) const

Additional Inherited Members
Static Public Member Functions inherited from impeller::Geometry
static std::shared_ptr< Geometry >	MakeFillPath (const Path &path, std::optional< Rect > inner_rect=std::nullopt)

static std::shared_ptr< Geometry >	MakeStrokePath (const Path &path, Scalar stroke_width=0.0, Scalar miter_limit=4.0, Cap stroke_cap=Cap::kButt, Join stroke_join=Join::kMiter)

static std::shared_ptr< Geometry >	MakeCover ()

static std::shared_ptr< Geometry >	MakeRect (const Rect &rect)

static std::shared_ptr< Geometry >	MakeOval (const Rect &rect)

static std::shared_ptr< Geometry >	MakeLine (const Point &p0, const Point &p1, Scalar width, Cap cap)

static std::shared_ptr< Geometry >	MakeCircle (const Point &center, Scalar radius)

static std::shared_ptr< Geometry >	MakeStrokedCircle (const Point &center, Scalar radius, Scalar stroke_width)

static std::shared_ptr< Geometry >	MakeRoundRect (const Rect &rect, const Size &radii)

static std::shared_ptr< Geometry >	MakePointField (std::vector< Point > points, Scalar radius, bool round)

Static Protected Member Functions inherited from impeller::Geometry
static GeometryResult	ComputePositionGeometry (const ContentContext &renderer, const Tessellator::VertexGenerator &generator, const Entity &entity, RenderPass &pass)

Detailed Description

A geometry that is created from a vertices object.

Definition at line 13 of file vertices_geometry.h.

Member Enumeration Documentation

◆ VertexMode

enum class impeller::VerticesGeometry::VertexMode

strong

Enumerator
kTriangles
kTriangleStrip
kTriangleFan

Definition at line 15 of file vertices_geometry.h.

                        {
    kTriangles,
    kTriangleStrip,
    kTriangleFan,
  };

Constructor & Destructor Documentation

◆ VerticesGeometry()

impeller::VerticesGeometry::VerticesGeometry	(	std::vector< Point >	vertices,
		std::vector< uint16_t >	indices,
		std::vector< Point >	texture_coordinates,
		std::vector< Color >	colors,
		Rect	bounds,
		VerticesGeometry::VertexMode	vertex_mode
	)

Definition at line 57 of file vertices_geometry.cc.

    : vertices_(std::move(vertices)),
      colors_(std::move(colors)),
      texture_coordinates_(std::move(texture_coordinates)),
      indices_(std::move(indices)),
      bounds_(bounds),
      vertex_mode_(vertex_mode) {
  NormalizeIndices();
}

◆ ~VerticesGeometry()

impeller::VerticesGeometry::~VerticesGeometry ( )

default

Member Function Documentation

◆ GetCoverage()

std::optional< Rect > impeller::VerticesGeometry::GetCoverage ( const Matrix & transform ) const

overridevirtual

Implements impeller::Geometry.

Definition at line 202 of file vertices_geometry.cc.

                                   {
  return bounds_.TransformBounds(transform);
}

◆ GetPositionBuffer()

GeometryResult impeller::VerticesGeometry::GetPositionBuffer	(	const ContentContext &	renderer,
		const Entity &	entity,
		RenderPass &	pass
	)		const

overridevirtual

Implements impeller::Geometry.

Definition at line 113 of file vertices_geometry.cc.

                            {
  auto index_count = indices_.size();
  auto vertex_count = vertices_.size();
 
  size_t total_vtx_bytes = vertex_count * sizeof(float) * 2;
  size_t total_idx_bytes = index_count * sizeof(uint16_t);
 
  auto vertex_buffer = renderer.GetTransientsBuffer().Emplace(
      reinterpret_cast<const uint8_t*>(vertices_.data()), total_vtx_bytes,
      alignof(float));
 
  BufferView index_buffer = {};
  if (index_count) {
    index_buffer = renderer.GetTransientsBuffer().Emplace(
        indices_.data(), total_idx_bytes, alignof(uint16_t));
  }
 
  return GeometryResult{
      .type = GetPrimitiveType(),
      .vertex_buffer =
          {
              .vertex_buffer = vertex_buffer,
              .index_buffer = index_buffer,
              .vertex_count = index_count > 0 ? index_count : vertex_count,
              .index_type =
                  index_count > 0 ? IndexType::k16bit : IndexType::kNone,
          },
      .transform = entity.GetShaderTransform(pass),
  };
}

◆ GetPositionUVColorBuffer()

GeometryResult impeller::VerticesGeometry::GetPositionUVColorBuffer	(	Rect	texture_coverage,
		Matrix	effect_transform,
		const ContentContext &	renderer,
		const Entity &	entity,
		RenderPass &	pass
	)		const

Definition at line 147 of file vertices_geometry.cc.

                            {
  using VS = PorterDuffBlendPipeline::VertexShader;
 
  auto vertex_count = vertices_.size();
  auto uv_transform =
      texture_coverage.GetNormalizingTransform() * effect_transform;
  auto has_texture_coordinates = HasTextureCoordinates();
  auto has_colors = HasVertexColors();
 
  size_t total_vtx_bytes = vertices_.size() * sizeof(VS::PerVertexData);
  auto vertex_buffer = renderer.GetTransientsBuffer().Emplace(
      total_vtx_bytes, alignof(VS::PerVertexData), [&](uint8_t* data) {
        VS::PerVertexData* vtx_contents =
            reinterpret_cast<VS::PerVertexData*>(data);
        for (auto i = 0u; i < vertices_.size(); i++) {
          auto vertex = vertices_[i];
          auto texture_coord =
              has_texture_coordinates ? texture_coordinates_[i] : vertices_[i];
          auto uv = uv_transform * texture_coord;
          VS::PerVertexData vertex_data = {
              .vertices = vertex,
              .texture_coords = uv,
              .color = has_colors ? colors_[i] : Color::BlackTransparent(),
          };
          std::memcpy(vtx_contents++, &vertex_data, sizeof(VS::PerVertexData));
        }
      });
 
  BufferView index_buffer = {};
  auto index_count = indices_.size();
  size_t total_idx_bytes = index_count * sizeof(uint16_t);
  if (index_count > 0) {
    index_buffer = renderer.GetTransientsBuffer().Emplace(
        indices_.data(), total_idx_bytes, alignof(uint16_t));
  }
 
  return GeometryResult{
      .type = GetPrimitiveType(),
      .vertex_buffer =
          {
              .vertex_buffer = vertex_buffer,
              .index_buffer = index_buffer,
              .vertex_count = index_count > 0 ? index_count : vertex_count,
              .index_type =
                  index_count > 0 ? IndexType::k16bit : IndexType::kNone,
          },
      .transform = entity.GetShaderTransform(pass),
  };
}

◆ GetTextureCoordinateCoverge()

std::optional< Rect > impeller::VerticesGeometry::GetTextureCoordinateCoverge ( ) const

Definition at line 100 of file vertices_geometry.cc.

                                                                      {
  if (!HasTextureCoordinates()) {
    return std::nullopt;
  }
  auto vertex_count = vertices_.size();
  if (vertex_count == 0) {
    return std::nullopt;
  }
 
  return Rect::MakePointBounds(texture_coordinates_.begin(),
                               texture_coordinates_.end());
}

◆ HasTextureCoordinates()

bool impeller::VerticesGeometry::HasTextureCoordinates ( ) const

Definition at line 96 of file vertices_geometry.cc.

                                                   {
  return texture_coordinates_.size() > 0;
}

◆ HasVertexColors()

bool impeller::VerticesGeometry::HasVertexColors ( ) const

Definition at line 92 of file vertices_geometry.cc.

                                             {
  return colors_.size() > 0;
}

The documentation for this class was generated from the following files:

impeller/entity/geometry/vertices_geometry.h
impeller/entity/geometry/vertices_geometry.cc

Public Types

Public Member Functions

Additional Inherited Members