[WebGL] Bind framebuffer before DrawBuffers/ReadBuffer selection.

1 files changed, 2 insertions, 0 deletions

diff --git a/dom/canvas/WebGLFramebuffer.cpp b/dom/canvas/WebGLFramebuffer.cpp
index 7a1d4dbd9e..cbba648bd1 100644
--- a/dom/canvas/WebGLFramebuffer.cpp
+++ b/dom/canvas/WebGLFramebuffer.cpp
@@ -1216,6 +1216,7 @@ WebGLFramebuffer::RefreshDrawBuffers() const
         }
     }
 
+    gl->fBindFramebuffer(LOCAL_GL_DRAW_FRAMEBUFFER, mGLName);
     gl->fDrawBuffers(driverBuffers.size(), driverBuffers.data());
 }
 
@@ -1235,6 +1236,7 @@ WebGLFramebuffer::RefreshReadBuffer() const
         driverBuffer = mColorReadBuffer->mAttachmentPoint;
     }
 
+    gl->fBindFramebuffer(LOCAL_GL_READ_FRAMEBUFFER, mGLName);
     gl->fReadBuffer(driverBuffer);
 }