Bug 649685 - Don't flip when drawing the backbuffer to the window with OpenGL. r=joe

2011-05-09 11:44:03 +12:00
parent 2397cceed0
commit af73bf63d9
1 changed files with 7 additions and 4 deletions
--- a/gfx/layers/opengl/LayerManagerOGL.cpp
+++ b/gfx/layers/opengl/LayerManagerOGL.cpp
@@ -666,10 +666,13 @@ LayerManagerOGL::Render()
                         right * 2.0f - 1.0f,
                         -(bottom * 2.0f - 1.0f) };

-    float coords[] = { left, top,
-                       right, top,
-                       left, bottom,
-                       right, bottom };
+    // Use flipped texture coordinates since our
+    // projection matrix also has a flip and we
+    // need to cancel that out.
+    float coords[] = { left, bottom,
+                       right, bottom,
+                       left, top,
+                       right, top };

    mGLContext->fVertexAttribPointer(vcattr,
                                     2, LOCAL_GL_FLOAT,