Package org.lwjgl.opengles

Class QCOMYCBCRDegamma

java.lang.Object
org.lwjgl.opengles.QCOMYCBCRDegamma
public final class QCOMYCBCRDegamma extends Object
Native bindings to the QCOM_ycbcr_degamma extension.

The OpenGL ES extensions OES_EGL_image_external and EXT_EGL_image_storage provide a mechanism for creating GL textures sharing storage with EGLImage objects which can encapsulate an external YCbCr buffer. The YCbCr data is stored according to the colorspace standards like ITU BT.601, BT.709, or BT.2020, and a transfer function like ITU OETF or sRGB EOTF, which translates the YCbCr data into non-linear space Y'CbCr. When sampling a Y'CbCr texture containing texels encoded, the conversion back to linear RGB requires conversion from non-linear RGB space to linear RGB space using an inverse transfer function. This operation of applying the inverse transfer function is also called "degamma". Currently, degamma operation is not executed as part of texture sampling, and instead application's shader code is expected to perform it separately. This computation can be somewhat expensive in the shader.

This extension allows implementations to use "sRGB EOTF" inverse transform function defined in Khronos data format 1.3 specification, for degamma operation. The degamma is performed during texture filtering, allowing texture filtering to operate in a linear space. The extension provides this functionality by selectively enabling degamma for both the luminance{Y} and/or chrominance {CbCr} components of any 8 bit YCbCr format. This new functionality is layered on top of the OES_EGL_image_external and EXT_EGL_image_storage extensions.

Requires GLES 3.0.

  • Field Details

    • GL_TEXTURE_Y_DEGAMMA_QCOM

      public static final int GL_TEXTURE_Y_DEGAMMA_QCOM
      Accepted by the pname parameter of TexParameteri and TexGetParameteri.
      See Also:

    • GL_TEXTURE_CBCR_DEGAMMA_QCOM

      public static final int GL_TEXTURE_CBCR_DEGAMMA_QCOM
      Accepted by the pname parameter of TexParameteri and TexGetParameteri.
      See Also: