impeller::SamplerGLES Class Reference

#include <sampler_gles.h>

Inheritance diagram for impeller::SamplerGLES:

Public Member Functions
	~SamplerGLES ()
bool	ConfigureBoundTexture (const TextureGLES &texture, const ProcTableGLES &gl) const
Public Member Functions inherited from impeller::Sampler
virtual	~Sampler ()
const SamplerDescriptor &	GetDescriptor () const

Friends
class	SamplerLibraryGLES

Additional Inherited Members
Static Public Member Functions inherited from impeller::BackendCast< SamplerGLES, Sampler >
static SamplerGLES &	Cast (Sampler &base)
static const SamplerGLES &	Cast (const Sampler &base)
static SamplerGLES *	Cast (Sampler *base)
static const SamplerGLES *	Cast (const Sampler *base)
Protected Member Functions inherited from impeller::Sampler
	Sampler (SamplerDescriptor desc)
Protected Attributes inherited from impeller::Sampler
SamplerDescriptor	desc_

Detailed Description

Definition at line 17 of file sampler_gles.h.

Constructor & Destructor Documentation

~SamplerGLES()

impeller::SamplerGLES::~SamplerGLES ( )

default

Member Function Documentation

ConfigureBoundTexture()

bool impeller::SamplerGLES::ConfigureBoundTexture	(	const TextureGLES &	texture,
		const ProcTableGLES &	gl
	)		const

Definition at line 70 of file sampler_gles.cc.

                                                                       {
  if (texture.NeedsMipmapGeneration()) {
    VALIDATION_LOG
        << "Texture mip count is > 1, but the mipmap has not been generated. "
           "Texture can not be sampled safely.";
    return false;
  }
 
  auto target = ToTextureTarget(texture.GetTextureDescriptor().type);
 
  if (!target.has_value()) {
    return false;
  }
  const auto& desc = GetDescriptor();
 
  GLint mag_filter = ToParam(desc.mag_filter);
 
  // If the texture doesn't have mipmaps, we can't use mip filtering.
  GLint min_filter;
  if (texture.GetTextureDescriptor().mip_count > 1) {
    min_filter = ToParam(desc.min_filter, desc.mip_filter);
  } else {
    min_filter = ToParam(desc.min_filter);
  }
 
  gl.TexParameteri(*target, GL_TEXTURE_MIN_FILTER, min_filter);
  gl.TexParameteri(*target, GL_TEXTURE_MAG_FILTER, mag_filter);
 
  const auto supports_decal_mode =
      gl.GetCapabilities()->SupportsDecalSamplerAddressMode();
 
  const auto wrap_s =
      ToAddressMode(desc.width_address_mode, supports_decal_mode);
  const auto wrap_t =
      ToAddressMode(desc.height_address_mode, supports_decal_mode);
 
  gl.TexParameteri(*target, GL_TEXTURE_WRAP_S, wrap_s);
  gl.TexParameteri(*target, GL_TEXTURE_WRAP_T, wrap_t);
 
  if (wrap_s == IMPELLER_GL_CLAMP_TO_BORDER ||
      wrap_t == IMPELLER_GL_CLAMP_TO_BORDER) {
    // Transparent black.
    const GLfloat border_color[4] = {0.0f, 0.0f, 0.0f, 0.0f};
    gl.TexParameterfv(*target, IMPELLER_GL_TEXTURE_BORDER_COLOR, border_color);
  }
 
  return true;
}

References impeller::ProcTableGLES::GetCapabilities(), impeller::Sampler::GetDescriptor(), impeller::Texture::GetTextureDescriptor(), IMPELLER_GL_CLAMP_TO_BORDER, IMPELLER_GL_TEXTURE_BORDER_COLOR, impeller::TextureDescriptor::mip_count, impeller::Texture::NeedsMipmapGeneration(), impeller::ToAddressMode(), impeller::ToParam(), impeller::ToTextureTarget(), impeller::TextureDescriptor::type, and VALIDATION_LOG.

Friends And Related Function Documentation

SamplerLibraryGLES

friend class SamplerLibraryGLES

friend

Definition at line 26 of file sampler_gles.h.

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

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