From e9783c3caf9e5f21c264277d35d045cfcc532fc7 Mon Sep 17 00:00:00 2001
From: "Carsten Haitzler (Rasterman)" <raster@rasterman.com>
Date: Tue, 7 Jan 2014 13:13:01 +0900
Subject: [PATCH] evas - gl-x11 engine - put in guessed blacklist of yinvert
 extn for intel mesa

---
 src/modules/evas/engines/gl_x11/evas_engine.c | 25 ++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/src/modules/evas/engines/gl_x11/evas_engine.c b/src/modules/evas/engines/gl_x11/evas_engine.c
index 8bea533d94..dc171f1d96 100644
--- a/src/modules/evas/engines/gl_x11/evas_engine.c
+++ b/src/modules/evas/engines/gl_x11/evas_engine.c
@@ -72,7 +72,7 @@ static int initted = 0;
 static int gl_wins = 0;
 static int extn_have_buffer_age = 1;
 #ifdef GL_GLES
-static int extn_have_y_inverted = 0;
+static int extn_have_y_inverted = 1;
 #endif
 
 typedef void            (*_eng_fn) (void);
@@ -717,9 +717,28 @@ gl_extn_veto(Render_Engine *re)
           {
              extn_have_buffer_age = 0;
           }
-        if (strstr(str, "EGL_NOK_texture_from_pixmap"))
+        if (!strstr(str, "EGL_NOK_texture_from_pixmap"))
           {
-             extn_have_y_inverted = 1;
+             extn_have_y_inverted = 0;
+          }
+        else
+          {
+             const GLubyte *vendor, *renderer;
+
+             vendor = glGetString(GL_VENDOR);
+             renderer = glGetString(GL_RENDERER);
+             // XXX: workaround mesa bug!
+             // looking for mesa and intel build which is known to
+             // advertise the EGL_NOK_texture_from_pixmap extension
+             // but not set it correctly. guessing vendor/renderer
+             // strings will be like the following:
+             // OpenGL vendor string: Intel Open Source Technology Center
+             // OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Desktop
+             if (((vendor) && (strstr(vendor, "Intel"))) &&
+                 ((renderer) && (strstr(renderer, "Mesa"))) &&
+                 ((renderer) && (strstr(renderer, "Intel")))
+                )
+               extn_have_y_inverted = 0;
           }
      }
    else