impeller::glvk Namespace Reference

Classes
class	ProcTable
	A proc. table consisting of methods that are useful when interoperating between OpenGL and Vulkan. This is different from the OpenGL proc. table since it may contain more interop extension related methods. More...
class	Trampoline
	An object used to interoperate between OpenGL and Vulkan. More...
class	AutoTrampolineContext
	An RAII object that makes the trampolines EGL context current when constructed and clears the EGL binding on destruction. More...

Functions
static UniqueEGLImageKHR	CreateEGLImageFromAHBTexture (const EGLDisplay &display, const AHBTextureSourceVK &to_texture)

Variables
static GLuint	kAttributeIndexPosition = 0u
static GLuint	kAttributeIndexTexCoord = 1u
static constexpr const char *	kVertShader
static constexpr const char *	kFragShader

Function Documentation

CreateEGLImageFromAHBTexture()

static UniqueEGLImageKHR impeller::glvk::CreateEGLImageFromAHBTexture ( const EGLDisplay &  display, const AHBTextureSourceVK &  to_texture  )

static

Definition at line 165 of file trampoline.cc.

                                          {
  if (!android::GetProcTable().eglGetNativeClientBufferANDROID.IsAvailable()) {
    VALIDATION_LOG << "Could not get native client buffer.";
    return {};
  }
 
  EGLClientBuffer client_buffer =
      android::GetProcTable().eglGetNativeClientBufferANDROID(
          to_texture.GetBackingStore()->GetHandle());
 
  if (!client_buffer) {
    VALIDATION_LOG
        << "Could not get client buffer from Android hardware buffer.";
    return {};
  }
 
  auto image = ::eglCreateImageKHR(display,                    //
                                   EGL_NO_CONTEXT,             //
                                   EGL_NATIVE_BUFFER_ANDROID,  //
                                   client_buffer,              //
                                   nullptr                     //
  );
  if (image == NULL) {
    VALIDATION_LOG << "Could not create EGL Image.";
    return {};
  }
 
  return UniqueEGLImageKHR(EGLImageKHRWithDisplay{image, display});
}

References impeller::AHBTextureSourceVK::GetBackingStore(), impeller::android::HardwareBuffer::GetHandle(), impeller::android::GetProcTable(), and VALIDATION_LOG.

Referenced by impeller::glvk::Trampoline::BlitTextureOpenGLToVulkan().

Variable Documentation

kAttributeIndexPosition

GLuint impeller::glvk::kAttributeIndexPosition = 0u

static

Definition at line 20 of file trampoline.cc.

Referenced by impeller::glvk::Trampoline::BlitTextureOpenGLToVulkan(), and impeller::glvk::Trampoline::Trampoline().

kAttributeIndexTexCoord

GLuint impeller::glvk::kAttributeIndexTexCoord = 1u

static

Definition at line 21 of file trampoline.cc.

Referenced by impeller::glvk::Trampoline::BlitTextureOpenGLToVulkan(), and impeller::glvk::Trampoline::Trampoline().

kFragShader

constexpr const char* impeller::glvk::kFragShader

staticconstexpr

Initial value:

= R"IMPELLER_SHADER(#version 100
 
#extension GL_OES_EGL_image_external : require
 
precision mediump float;
 
uniform samplerExternalOES uTexture;
uniform mat4 uUVTransformation;
 
varying vec2 vTexCoord;
 
void main() {
  vec2 texture_coords = (uUVTransformation * vec4(vTexCoord, 0, 1)).xy;
  gl_FragColor = texture2D(uTexture, texture_coords);
}
 
)IMPELLER_SHADER"

Definition at line 39 of file trampoline.cc.

Referenced by impeller::glvk::Trampoline::Trampoline().

kVertShader

constexpr const char* impeller::glvk::kVertShader

staticconstexpr

Initial value:

= R"IMPELLER_SHADER(#version 100
 
precision mediump float;
 
attribute vec2 aPosition;
attribute vec2 aTexCoord;
 
varying vec2 vTexCoord;
 
void main() {
  gl_Position = vec4(aPosition, 0.0, 1.0);
  vTexCoord = aTexCoord;
 
}
)IMPELLER_SHADER"

Definition at line 23 of file trampoline.cc.

Referenced by impeller::glvk::Trampoline::Trampoline().