mesa: ensure pbo stencil buffers are mapped before use

diff --git a/src/mesa/state_tracker/st_cb_drawpixels.c b/src/mesa/state_tracker/st_cb_drawpixels.c
index f9f139f..8926aa3 100644 (file)
--- a/src/mesa/state_tracker/st_cb_drawpixels.c
+++ b/src/mesa/state_tracker/st_cb_drawpixels.c
@@ -640,6 +640,9 @@ draw_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
 
    stmap = screen->transfer_map(screen, pt);
 
+   pixels = _mesa_map_drawpix_pbo(ctx, unpack, pixels);
+   assert(pixels);
+
    /* if width > MAX_WIDTH, have to process image in chunks */
    skipPixels = 0;
    while (skipPixels < width) {
@@ -705,6 +708,8 @@ draw_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
       skipPixels += spanWidth;
    }
 
+   _mesa_unmap_drawpix_pbo(ctx, unpack);
+
    /* unmap the stencil buffer */
    screen->transfer_unmap(screen, pt);
    screen->tex_transfer_destroy(pt);