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-rw-r--r--src/mesa/state_tracker/st_cb_fbo.c32
1 files changed, 31 insertions, 1 deletions
diff --git a/src/mesa/state_tracker/st_cb_fbo.c b/src/mesa/state_tracker/st_cb_fbo.c
index fe9befaa2c..9ae4208a18 100644
--- a/src/mesa/state_tracker/st_cb_fbo.c
+++ b/src/mesa/state_tracker/st_cb_fbo.c
@@ -455,6 +455,31 @@ st_validate_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
/**
+ * Copy back color buffer to front color buffer.
+ */
+static void
+copy_back_to_front(struct st_context *st,
+ struct gl_framebuffer *fb,
+ gl_buffer_index frontIndex,
+ gl_buffer_index backIndex)
+
+{
+ struct st_framebuffer *stfb = (struct st_framebuffer *) fb;
+ struct pipe_surface *surf_front, *surf_back;
+
+ (void) st_get_framebuffer_surface(stfb, frontIndex, &surf_front);
+ (void) st_get_framebuffer_surface(stfb, backIndex, &surf_back);
+
+ if (surf_front && surf_back) {
+ st->pipe->surface_copy(st->pipe,
+ surf_front, 0, 0, /* dest */
+ surf_back, 0, 0, /* src */
+ fb->Width, fb->Height);
+ }
+}
+
+
+/**
* Check if we're drawing into, or read from, a front color buffer. If the
* front buffer is missing, create it now.
*
@@ -493,7 +518,7 @@ check_create_front_buffer(GLcontext *ctx, struct gl_framebuffer *fb,
uint samples;
if (0)
- _mesa_debug(ctx, "Allocate new front buffer");
+ _mesa_debug(ctx, "Allocate new front buffer\n");
/* get back renderbuffer info */
back = st_renderbuffer(fb->Attachment[backIndex].Renderbuffer);
@@ -507,6 +532,11 @@ check_create_front_buffer(GLcontext *ctx, struct gl_framebuffer *fb,
/* alloc texture/surface for new front buffer */
front->AllocStorage(ctx, front, front->InternalFormat,
fb->Width, fb->Height);
+
+ /* initialize the front color buffer contents by copying
+ * the back buffer.
+ */
+ copy_back_to_front(ctx->st, fb, frontIndex, backIndex);
}
}
}