libcamera: software_isp: lut: Make gamma from lut.cpp available in debayer params

Provide the gamma used in IPA to Bayer parameters. We will pass Gamma into
the shader via a uniform and can then tweak that value from outside at
will.

Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/software_isp/debayer.cpp

@@ -110,6 +110,11 @@ namespace libcamera {
  * \brief Blacklevel gains for the GPUISP
  */
 
+/**
+ * \var DebayerParams::gamma
+ * \brief Gamma value for the GPUISP
+ */
+
 /**
  * \class Debayer
  * \brief Base debayering class