From 170f3ee08944fb4b80e4bbbfdbbfb3250d301cc7 Mon Sep 17 00:00:00 2001
From: Sebastian Wick <sebastian.wick@redhat.com>
Date: Tue, 8 Feb 2022 21:22:58 +0100
Subject: [PATCH] glsl-effect: Allow to set uniform matrices

Add support for setting a uniform matrix on GLSLEffect because the color
vision deficiency simulation extension requires it.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2164>
---
 src/shell-glsl-effect.c | 24 ++++++++++++++++++++++++
 src/shell-glsl-effect.h |  6 ++++++
 2 files changed, 30 insertions(+)

diff --git a/src/shell-glsl-effect.c b/src/shell-glsl-effect.c
index ee6f5eefe..3051e0af9 100644
--- a/src/shell-glsl-effect.c
+++ b/src/shell-glsl-effect.c
@@ -179,3 +179,27 @@ shell_glsl_effect_set_uniform_float (ShellGLSLEffect *effect,
                                    n_components, total_count / n_components,
                                    value);
 }
+
+/**
+ * shell_glsl_effect_set_uniform_matrix:
+ * @effect: a #ShellGLSLEffect
+ * @uniform: the uniform location (as returned by shell_glsl_effect_get_uniform_location())
+ * @transpose: Whether to transpose the matrix
+ * @dimensions: the number of components in the uniform (eg. 3 for a vec3)
+ * @total_count: the total number of floats in @value
+ * @value: (array length=total_count): the array of floats to set @uniform
+ */
+void
+shell_glsl_effect_set_uniform_matrix (ShellGLSLEffect *effect,
+                                      int              uniform,
+                                      gboolean         transpose,
+                                      int              dimensions,
+                                      int              total_count,
+                                      const float     *value)
+{
+  ShellGLSLEffectPrivate *priv = shell_glsl_effect_get_instance_private (effect);
+  cogl_pipeline_set_uniform_matrix (priv->pipeline, uniform,
+                                    dimensions,
+                                    total_count / (dimensions * dimensions),
+                                    transpose, value);
+}
diff --git a/src/shell-glsl-effect.h b/src/shell-glsl-effect.h
index d943cefb8..3759e7172 100644
--- a/src/shell-glsl-effect.h
+++ b/src/shell-glsl-effect.h
@@ -52,5 +52,11 @@ void shell_glsl_effect_set_uniform_float    (ShellGLSLEffect *effect,
                                              int              n_components,
                                              int              total_count,
                                              const float     *value);
+void shell_glsl_effect_set_uniform_matrix   (ShellGLSLEffect *effect,
+                                             int              uniform,
+                                             gboolean         transpose,
+                                             int              dimensions,
+                                             int              total_count,
+                                             const float     *value);
 
 #endif /* __SHELL_GLSL_EFFECT_H__ */