generic opengl code: expose helper function

modules/video_output/opengl.c

@@ -95,11 +95,6 @@
 #   define SUPPORTS_FIXED_PIPELINE
 #endif
 
-static const vlc_fourcc_t gl_subpicture_chromas[] = {
-    VLC_CODEC_RGBA,
-    0
-};
-
 typedef struct {
     GLuint   texture;
     unsigned format;
@@ -1002,7 +997,7 @@ static const GLfloat identity[] = {
     0.0f, 0.0f, 0.0f, 1.0f
 };
 
-static void orientationTransformMatrix(GLfloat matrix[static 16], video_orientation_t orientation) {
+void orientationTransformMatrix(GLfloat matrix[static 16], video_orientation_t orientation) {
 
     memcpy(matrix, identity, sizeof(identity));
 

modules/video_output/opengl.h

@@ -67,6 +67,11 @@
 # endif
 #endif
 
+static const vlc_fourcc_t gl_subpicture_chromas[] = {
+    VLC_CODEC_RGBA,
+    0
+};
+
 static inline bool HasExtension(const char *apis, const char *api)
 {
     size_t apilen = strlen(api);
@@ -80,6 +85,8 @@ static inline bool HasExtension(const char *apis, const char *api)
     return false;
 }
 
+void orientationTransformMatrix(GLfloat matrix[static 16], video_orientation_t orientation);
+
 typedef struct vout_display_opengl_t vout_display_opengl_t;
 
 vout_display_opengl_t *vout_display_opengl_New(video_format_t *fmt,