From 7fcef3818e77d3eea1155f104253bf38c1dbd1a3 Mon Sep 17 00:00:00 2001
From: Matthew Waters <matthew@centricular.com>
Date: Thu, 20 Jul 2023 20:58:15 +1000
Subject: [PATCH] glcolorconvert: expose the swizzle glsl functions

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5109>
---
 girs/GstGL-1.0.gir                                | 14 ++++++++++++++
 .../gst-libs/gst/gl/gstglcolorconvert.c           | 15 +++++++++++++++
 .../gst-libs/gst/gl/gstglcolorconvert.h           |  3 +++
 3 files changed, 32 insertions(+)

diff --git a/girs/GstGL-1.0.gir b/girs/GstGL-1.0.gir
index fa6f98f8a7..e18fe8953d 100644
--- a/girs/GstGL-1.0.gir
+++ b/girs/GstGL-1.0.gir
@@ -1543,6 +1543,20 @@ The glcolorconvertelement provides a GStreamer element that uses
           </parameter>
         </parameters>
       </function>
+      <function name="swizzle_shader_string" c:identifier="gst_gl_color_convert_swizzle_shader_string" version="1.24">
+        <source-position filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.h"/>
+        <return-value transfer-ownership="full">
+          <doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c">a shader string that can be used to swizzle vec
+components in a GLSL shader.</doc>
+          <type name="utf8" c:type="gchar*"/>
+        </return-value>
+        <parameters>
+          <parameter name="context" transfer-ownership="none">
+            <doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c">a #GstGLContext</doc>
+            <type name="GLContext" c:type="GstGLContext*"/>
+          </parameter>
+        </parameters>
+      </function>
       <function name="transform_caps" c:identifier="gst_gl_color_convert_transform_caps" version="1.6">
         <doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c">Provides an implementation of #GstBaseTransformClass.transform_caps()</doc>
         <source-position filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.h"/>
diff --git a/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c b/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c
index 12970b76bc..4dc46266be 100644
--- a/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c
+++ b/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c
@@ -3258,6 +3258,21 @@ _do_convert_draw (GstGLContext * context, GstGLColorConvert * convert)
   return ret;
 }
 
+/**
+ * gst_gl_color_convert_swizzle_shader_string:
+ * @context: a #GstGLContext
+ *
+ * Returns: (transfer full): a shader string that can be used to swizzle vec
+ * components in a GLSL shader.
+ *
+ * Since: 1.24
+ */
+gchar *
+gst_gl_color_convert_swizzle_shader_string (GstGLContext * context)
+{
+  return g_strdup (glsl_func_swizzle);
+}
+
 /**
  * gst_gl_color_convert_yuv_to_rgb_shader_string:
  * @context: a #GstGLContext
diff --git a/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.h b/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.h
index ca2eb8a6c9..47df0f200e 100644
--- a/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.h
+++ b/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.h
@@ -151,6 +151,9 @@ gboolean    gst_gl_color_convert_decide_allocation (GstGLColorConvert   * conver
 GST_GL_API
 GstBuffer * gst_gl_color_convert_perform    (GstGLColorConvert * convert, GstBuffer * inbuf);
 
+GST_GL_API
+gchar *     gst_gl_color_convert_swizzle_shader_string (GstGLContext * context);
+
 GST_GL_API
 gchar *     gst_gl_color_convert_yuv_to_rgb_shader_string (GstGLContext * context);