From bcd9f4c69103d766e3dcd8ffa10b5880ea5110bf Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Tue, 14 Jul 2026 21:07:04 +0200
Subject: kms capture: make capture work with night lights enabled

---
 include/color_conversion.h |  7 +++++++
 include/egl.h              |  1 +
 include/kde_night_light.h  | 13 +++++++++++++
 3 files changed, 21 insertions(+)
 create mode 100644 include/kde_night_light.h

(limited to 'include')

diff --git a/include/color_conversion.h b/include/color_conversion.h
index 7950472..251fe17 100644
--- a/include/color_conversion.h
+++ b/include/color_conversion.h
@@ -41,6 +41,8 @@ typedef struct {
     int hdr_sdr_white_pq;
     int hdr_sdr_white_scale;
     int gamma_lut_enabled;
+    int night_light_transfer;
+    int night_light_matrix;
 } gsr_color_graphics_uniforms;
 
 typedef struct {
@@ -73,6 +75,8 @@ typedef struct {
     float hdr_sdr_white_scale;
     unsigned int gamma_lut_texture_id;
     bool gamma_lut_apply;
+    int night_light_transfer;
+    float night_light_matrix[9];
     bool hdr_shaders_loaded;
     bool hdr_shaders_load_failed;
 } gsr_color_conversion;
@@ -85,6 +89,9 @@ void gsr_color_conversion_clear(gsr_color_conversion *self);
 void gsr_color_conversion_set_hdr_to_sdr_tone_mapping(gsr_color_conversion *self, bool enable, float hdr_peak_luminance, float sdr_white_luminance);
 void gsr_color_conversion_set_gamma_lut(gsr_color_conversion *self, const float *rgb_values, int num_entries);
 void gsr_color_conversion_enable_gamma_lut(gsr_color_conversion *self, bool enable);
+/* |inverse_matrix| is a row major 3x3 matrix that is applied to linear rgb values in the draw functions, for RGB/BGR sources. NULL to disable.
+   |pq_color_transfer| chooses the transfer characteristics used to decode/encode the source image around the matrix multiply (pq or gamma 2.2) */
+void gsr_color_conversion_set_night_light_matrix(gsr_color_conversion *self, const float *inverse_matrix, bool pq_color_transfer);
 void gsr_color_conversion_read_destination_texture(gsr_color_conversion *self, int destination_texture_index, int x, int y, int width, int height, unsigned int color_format, unsigned int data_format, void *pixels);
 
 gsr_rotation gsr_monitor_rotation_to_rotation(gsr_monitor_rotation monitor_rotation);
diff --git a/include/egl.h b/include/egl.h
index c9c54e5..c8dcd2b 100644
--- a/include/egl.h
+++ b/include/egl.h
@@ -311,6 +311,7 @@ struct gsr_egl {
     void (*glUniform1i)(int location, int v0);
     void (*glUniform2i)(int location, int v0, int v1);
     void (*glUniformMatrix2fv)(int location, int count, unsigned char transpose, const float *value);
+    void (*glUniformMatrix3fv)(int location, int count, unsigned char transpose, const float *value);
     void (*glDebugMessageCallback)(GLDEBUGPROC callback, const void *userParam);
     void (*glScissor)(int x, int y, int width, int height);
     void (*glCreateBuffers)(int n, unsigned int *buffers);
diff --git a/include/kde_night_light.h b/include/kde_night_light.h
new file mode 100644
index 0000000..ed12f1d
--- /dev/null
+++ b/include/kde_night_light.h
@@ -0,0 +1,13 @@
+#ifndef GSR_KDE_NIGHT_LIGHT_H
+#define GSR_KDE_NIGHT_LIGHT_H
+
+#include <stdbool.h>
+
+typedef struct gsr_kde_night_light gsr_kde_night_light;
+
+gsr_kde_night_light* gsr_kde_night_light_create(void);
+void gsr_kde_night_light_destroy(gsr_kde_night_light *self);
+/* Returns true when night light is active. |inverse_matrix| is filled with the row major 3x3 matrix that removes the night light tint from linear rgb values */
+bool gsr_kde_night_light_get_inverse_matrix(gsr_kde_night_light *self, float inverse_matrix[9]);
+
+#endif /* GSR_KDE_NIGHT_LIGHT_H */
-- 
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