gl: Use a uniform to flip R and B colors on GLES

This allows us to decide when the R and B color channels should be
flipped with a much better granularity.

For instance, when using GLX_EXT_texture_from_pixmap to create a GL
texture from a surface we don't need to swap the R and B channels, as
the internal representation of the texture data will already have the
appropriate colors.

We also don't need to flip color channels when blitting from a texture.

1 files changed, 1 insertions, 0 deletions

diff --git a/gdk/gdkglcontextprivate.h b/gdk/gdkglcontextprivate.h
index c15524b558..cb0b76793f 100644
--- a/gdk/gdkglcontextprivate.h
+++ b/gdk/gdkglcontextprivate.h
@@ -56,6 +56,7 @@ typedef struct {
   guint position_location;
   guint uv_location;
   guint map_location;
+  guint flip_location;
 } GdkGLContextProgram;
 
 typedef struct {