[PATCH v1 4/7] ui/console-gl: Add an option to override a surface's glformat

[Vivek Kasireddy <vivek.kasireddy@intel.com>]

In some cases where a UI component (e.g, Spice) needs to choose
a particular glformat for a surface while creating a texture,
this new GLenum provides an option to do so. One situation
where this needs to be done is when the Host endianness is
causing issues such as interchanged R and B channels.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Frediano Ziglio <freddy77@gmail.com>
Cc: Dongwon Kim <dongwon.kim@intel.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
---
 include/ui/surface.h | 1 +
 ui/console-gl.c      | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/include/ui/surface.h b/include/ui/surface.h
index 4244e0ca4a..a39fee55a2 100644
--- a/include/ui/surface.h
+++ b/include/ui/surface.h
@@ -20,6 +20,7 @@ typedef struct DisplaySurface {
     uint8_t flags;
 #ifdef CONFIG_OPENGL
     GLenum glformat;
+    GLenum target_glformat;
     GLenum gltype;
     GLuint texture;
 #endif
diff --git a/ui/console-gl.c b/ui/console-gl.c
index 103b954017..dee317f42c 100644
--- a/ui/console-gl.c
+++ b/ui/console-gl.c
@@ -72,6 +72,12 @@ void surface_gl_create_texture(QemuGLShader *gls,
         g_assert_not_reached();
     }
 
+    /* The caller wants to override the glformat in some specific cases */
+    if (surface->target_glformat &&
+        surface->target_glformat != surface->glformat) {
+        surface->glformat = surface->target_glformat;
+    }
+
     glGenTextures(1, &surface->texture);
     glEnable(GL_TEXTURE_2D);
     glBindTexture(GL_TEXTURE_2D, surface->texture);
-- 
2.39.2