renderer: factor out logic for upgrading GL format to 16bit

diff --git a/xbmc/cores/VideoRenderers/LinuxRendererGL.cpp b/xbmc/cores/VideoRenderers/LinuxRendererGL.cpp
index 3d54594..aa52f72 100644 (file)
--- a/xbmc/cores/VideoRenderers/LinuxRendererGL.cpp
+++ b/xbmc/cores/VideoRenderers/LinuxRendererGL.cpp
@@ -1895,6 +1895,25 @@ void CLinuxRendererGL::DeleteYV12Texture(int index)
   }
 }
 
+static GLint GetInternalFormat(GLint format, int bpp)
+{
+  if(bpp == 2)
+  {
+    switch (format)
+    {
+#ifdef GL_ALPHA16
+      case GL_ALPHA:     return GL_ALPHA16;
+#endif
+#ifdef GL_LUMINANCE16
+      case GL_LUMINANCE: return GL_LUMINANCE16;
+#endif
+      default:           return format;
+    }
+  }
+  else
+    return format;
+}
+
 bool CLinuxRendererGL::CreateYV12Texture(int index)
 {
   /* since we also want the field textures, pitch must be texture aligned */
@@ -2039,21 +2058,10 @@ bool CLinuxRendererGL::CreateYV12Texture(int index)
         GLenum format;
         GLint internalformat;
         if (p == 2) //V plane needs an alpha texture
-        {
           format = GL_ALPHA;
-          if(im.bpp == 2)
-            internalformat = GL_ALPHA16;
-          else
-            internalformat = GL_ALPHA;
-        }
         else
-        {
           format = GL_LUMINANCE;
-          if(im.bpp == 2)
-            internalformat = GL_LUMINANCE16;
-          else
-            internalformat = GL_LUMINANCE;
-        }
+        internalformat = GetInternalFormat(format, im.bpp);
 
         glTexImage2D(m_textureTarget, 0, internalformat, plane.texwidth, plane.texheight, 0, format, GL_UNSIGNED_BYTE, NULL);
       }