impeller::BufferBindingsGLES Class Reference

Sets up stage bindings for single draw call in the OpenGLES backend. More...

#include <buffer_bindings_gles.h>

Public Member Functions
	BufferBindingsGLES ()
	~BufferBindingsGLES ()
bool	RegisterVertexStageInput (const ProcTableGLES &gl, const std::vector< ShaderStageIOSlot > &inputs, const std::vector< ShaderStageBufferLayout > &layouts)
bool	ReadUniformsBindings (const ProcTableGLES &gl, GLuint program)
bool	BindVertexAttributes (const ProcTableGLES &gl, size_t binding, size_t vertex_offset)
bool	BindUniformData (const ProcTableGLES &gl, const std::vector< TextureAndSampler > &bound_textures, const std::vector< BufferResource > &bound_buffers, Range texture_range, Range buffer_range)
bool	UnbindVertexAttributes (const ProcTableGLES &gl)

Detailed Description

Sets up stage bindings for single draw call in the OpenGLES backend.

Definition at line 28 of file buffer_bindings_gles.h.

Constructor & Destructor Documentation

BufferBindingsGLES()

impeller::BufferBindingsGLES::BufferBindingsGLES ( )

default

~BufferBindingsGLES()

impeller::BufferBindingsGLES::~BufferBindingsGLES ( )

default

References type.

Member Function Documentation

BindUniformData()

bool impeller::BufferBindingsGLES::BindUniformData	(	const ProcTableGLES &	gl,
		const std::vector< TextureAndSampler > &	bound_textures,
		const std::vector< BufferResource > &	bound_buffers,
		Range	texture_range,
		Range	buffer_range
	)

Definition at line 222 of file buffer_bindings_gles.cc.

                        {
  for (auto i = 0u; i < buffer_range.length; i++) {
    if (!BindUniformBuffer(gl, bound_buffers[buffer_range.offset + i])) {
      return false;
    }
  }
  std::optional<size_t> next_unit_index =
      BindTextures(gl, bound_textures, texture_range, ShaderStage::kVertex);
  if (!next_unit_index.has_value()) {
    return false;
  }
  if (!BindTextures(gl, bound_textures, texture_range, ShaderStage::kFragment,
                    *next_unit_index)
           .has_value()) {
    return false;
  }
 
  return true;
}

References i, impeller::kFragment, impeller::kVertex, impeller::Range::length, and impeller::Range::offset.

Referenced by impeller::EncodeCommandsInReactor(), impeller::testing::TEST(), and impeller::testing::TEST().

BindVertexAttributes()

bool impeller::BufferBindingsGLES::BindVertexAttributes	(	const ProcTableGLES &	gl,
		size_t	binding,
		size_t	vertex_offset
	)

Definition at line 194 of file buffer_bindings_gles.cc.

                                                                    {
  if (binding >= vertex_attrib_arrays_.size()) {
    return false;
  }
 
  if (!gl.GetCapabilities()->IsES()) {
    FML_DCHECK(vertex_array_object_ == 0);
    gl.GenVertexArrays(1, &vertex_array_object_);
    gl.BindVertexArray(vertex_array_object_);
  }
 
  for (const auto& array : vertex_attrib_arrays_[binding]) {
    gl.EnableVertexAttribArray(array.index);
    gl.VertexAttribPointer(array.index,       // index
                           array.size,        // size (must be 1, 2, 3, or 4)
                           array.type,        // type
                           array.normalized,  // normalized
                           array.stride,      // stride
                           reinterpret_cast<const GLvoid*>(static_cast<GLsizei>(
                               vertex_offset + array.offset))  // pointer
    );
  }
 
  return true;
}

References FML_DCHECK, and impeller::ProcTableGLES::GetCapabilities().

Referenced by impeller::BindVertexBuffer().

ReadUniformsBindings()

bool impeller::BufferBindingsGLES::ReadUniformsBindings	(	const ProcTableGLES &	gl,
		GLuint	program
	)

Definition at line 101 of file buffer_bindings_gles.cc.

                                                              {
  if (!gl.IsProgram(program)) {
    return false;
  }
  program_handle_ = program;
  if (gl.GetDescription()->GetGlVersion().IsAtLeast(Version{3, 0, 0})) {
    return ReadUniformsBindingsV3(gl, program);
  }
  return ReadUniformsBindingsV2(gl, program);
}

References impeller::ProcTableGLES::GetDescription(), impeller::DescriptionGLES::GetGlVersion(), and impeller::Version::IsAtLeast().

RegisterVertexStageInput()

bool impeller::BufferBindingsGLES::RegisterVertexStageInput	(	const ProcTableGLES &	gl,
		const std::vector< ShaderStageIOSlot > &	inputs,
		const std::vector< ShaderStageBufferLayout > &	layouts
	)

Definition at line 31 of file buffer_bindings_gles.cc.

                                                       {
  std::vector<std::vector<VertexAttribPointer>> vertex_attrib_arrays(
      layouts.size());
  // Every layout corresponds to a vertex binding.
  // As we record, separate the attributes into buckets for each layout in
  // ascending order. We do this because later on, we'll need to associate each
  // of the attributes with bound buffers corresponding to the binding.
  for (auto layout_i = 0u; layout_i < layouts.size(); layout_i++) {
    const auto& layout = layouts[layout_i];
    for (const auto& input : p_inputs) {
      if (input.binding != layout_i) {
        continue;
      }
      VertexAttribPointer attrib;
      attrib.index = input.location;
      // Component counts must be 1, 2, 3 or 4. Do that validation now.
      if (input.vec_size < 1u || input.vec_size > 4u) {
        return false;
      }
      attrib.size = input.vec_size;
      auto type = ToVertexAttribType(input.type);
      if (!type.has_value()) {
        return false;
      }
      attrib.type = type.value();
      attrib.normalized = GL_FALSE;
      attrib.offset = input.offset;
      attrib.stride = layout.stride;
      vertex_attrib_arrays[layout_i].push_back(attrib);
    }
  }
  vertex_attrib_arrays_ = std::move(vertex_attrib_arrays);
  return true;
}

References input(), impeller::ToVertexAttribType(), and type.

UnbindVertexAttributes()

bool impeller::BufferBindingsGLES::UnbindVertexAttributes

(

const ProcTableGLES &

gl

)

Definition at line 247 of file buffer_bindings_gles.cc.

                                                                       {
  for (const auto& array : vertex_attrib_arrays_) {
    for (const auto& attribute : array) {
      gl.DisableVertexAttribArray(attribute.index);
    }
  }
  if (!gl.GetCapabilities()->IsES()) {
    gl.DeleteVertexArrays(1, &vertex_array_object_);
    vertex_array_object_ = 0;
  }
 
  return true;
}

References impeller::ProcTableGLES::GetCapabilities().

Referenced by impeller::EncodeCommandsInReactor().

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

• impeller/renderer/backend/gles/buffer_bindings_gles.h
• impeller/renderer/backend/gles/buffer_bindings_gles.cc