backends/drm: Pass the correct arguments to encodingToNits in the ICC shader

src/backends/drm/icc.frag

@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: 2023 Xaver Hugl <xaver.hugl@gmail.com>
 // SPDX-License-Identifier: GPL-2.0-or-later
 #include "colormanagement.glsl"
+
 precision highp float;
 precision highp sampler2D;
 precision highp sampler3D;
@@ -25,6 +26,8 @@ uniform sampler3D Csampler;
 uniform int Asize;
 uniform sampler2D Asampler;
 
+uniform float referenceLuminance;
+
 vec3 sample1DLut(vec3 input, sampler2D lut, int lutSize) {
     float lutOffset = 0.5 / float(lutSize);
     float lutScale = 1.0 - lutOffset * 2.0;
@@ -37,7 +40,7 @@ vec3 sample1DLut(vec3 input, sampler2D lut, int lutSize) {
 void main()
 {
     vec4 tex = texture2D(src, texcoord0);
-    tex = encodingToNits(tex, sourceNamedTransferFunction);
+    tex = encodingToNits(tex, sourceNamedTransferFunction, referenceLuminance);
     tex.rgb /= max(tex.a, 0.001);
     tex.rgb /= referenceLuminance;
     tex.rgb = (toXYZD50 * vec4(tex.rgb, 1.0)).rgb;

src/backends/drm/icc_core.frag

@@ -2,6 +2,7 @@
 // SPDX-FileCopyrightText: 2023 Xaver Hugl <xaver.hugl@gmail.com>
 // SPDX-License-Identifier: GPL-2.0-or-later
 #include "colormanagement.glsl"
+
 precision highp float;
 precision highp sampler2D;
 precision highp sampler3D;
@@ -28,6 +29,8 @@ uniform sampler3D Csampler;
 uniform int Asize;
 uniform sampler2D Asampler;
 
+uniform float referenceLuminance;
+
 vec3 sample1DLut(in vec3 srcColor, in sampler2D lut, in int lutSize) {
     float lutOffset = 0.5 / float(lutSize);
     float lutScale = 1.0 - lutOffset * 2.0;
@@ -40,7 +43,7 @@ vec3 sample1DLut(in vec3 srcColor, in sampler2D lut, in int lutSize) {
 void main()
 {
     vec4 tex = texture(src, texcoord0);
-    tex = encodingToNits(tex, sourceNamedTransferFunction);
+    tex = encodingToNits(tex, sourceNamedTransferFunction,referenceLuminance);
     tex.rgb /= max(tex.a, 0.001);
     tex.rgb /= referenceLuminance;
     tex.rgb = (toXYZD50 * vec4(tex.rgb, 1.0)).rgb;