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Diffstat (limited to 'src/mesa/drivers/dri/common/drirenderbuffer.c')
-rw-r--r--src/mesa/drivers/dri/common/drirenderbuffer.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/common/drirenderbuffer.c b/src/mesa/drivers/dri/common/drirenderbuffer.c
index 201ce44950..45c81e293c 100644
--- a/src/mesa/drivers/dri/common/drirenderbuffer.c
+++ b/src/mesa/drivers/dri/common/drirenderbuffer.c
@@ -100,3 +100,35 @@ driNewRenderbuffer(GLenum format, GLint cpp, GLint offset, GLint pitch)
}
return drb;
}
+
+
+/**
+ * Update the front and back renderbuffers' flippedPitch/Offset fields.
+ * This is used when we do double buffering via page flipping.
+ */
+void
+driFlipRenderbuffers(struct gl_framebuffer *fb, GLenum flipped)
+{
+ driRenderbuffer *front_drb
+ = (driRenderbuffer *) fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer;
+ driRenderbuffer *back_drb
+ = (driRenderbuffer *) fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer;
+
+ /* If this fails, it means we're trying to do page flipping for a
+ * single-buffered window!
+ */
+ assert(back_drb);
+
+ if (flipped) {
+ front_drb->flippedOffset = back_drb->offset;
+ front_drb->flippedPitch = back_drb->pitch;
+ back_drb->flippedOffset = front_drb->offset;
+ back_drb->flippedPitch = front_drb->pitch;
+ }
+ else {
+ front_drb->flippedOffset = front_drb->offset;
+ front_drb->flippedPitch = front_drb->pitch;
+ back_drb->flippedOffset = back_drb->offset;
+ back_drb->flippedPitch = back_drb->pitch;
+ }
+}