[Mesa-stable] [PATCH 2/2] i965: Respect miptree offsets in intel_readpixels_tiled_memcpy()

[Chad Versace]

Respect intel_miptree_slice::x_offset,y_offset and
intel_mipmap_tree::offset. All three may be non-zero when glReadPixels
is called on an EGLImage created from the non-base slice of a miptree.

Patch 2/2 that fixes test
'dEQP-EGL.functional.image.create.gles2_cubemap_*'.

Reported-by: Haixia Shi <hshi at chromium.org>
Diagnosed-by: Haixia Shi <hshi at chromium.org>
Cc: Jason Ekstrand <jason at jlekstrand.net>
Cc: Mark Janes <mark.a.janes at intel.com>
Cc: mesa-stable at lists.freedesktop.org
Change-Id: I4b397b27e55a743a7094d29fb0a6a4b6b34352b0
---
 src/mesa/drivers/dri/i965/intel_pixel_read.c | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/intel_pixel_read.c b/src/mesa/drivers/dri/i965/intel_pixel_read.c
index a486d6e..cacd7e2 100644
--- a/src/mesa/drivers/dri/i965/intel_pixel_read.c
+++ b/src/mesa/drivers/dri/i965/intel_pixel_read.c
@@ -110,22 +110,6 @@ intel_readpixels_tiled_memcpy(struct gl_context * ctx,
    if (ctx->_ImageTransferState)
       return false;
 
-   /* This renderbuffer can come from a texture.  In this case, we impose
-    * some of the same restrictions we have for textures and adjust for
-    * miplevels.
-    */
-   if (rb->TexImage) {
-      if (rb->TexImage->TexObject->Target != GL_TEXTURE_2D &&
-          rb->TexImage->TexObject->Target != GL_TEXTURE_RECTANGLE)
-         return false;
-
-      int level = rb->TexImage->Level + rb->TexImage->TexObject->MinLevel;
-
-      /* Adjust x and y offset based on miplevel */
-      xoffset += irb->mt->level[level].level_x;
-      yoffset += irb->mt->level[level].level_y;
-   }
-
    /* It is possible that the renderbuffer (or underlying texture) is
     * multisampled.  Since ReadPixels from a multisampled buffer requires a
     * multisample resolve, we can't handle this here
@@ -169,6 +153,9 @@ intel_readpixels_tiled_memcpy(struct gl_context * ctx,
       return false;
    }
 
+   xoffset += irb->mt->level[irb->mt_level].slice[irb->mt_layer].x_offset;
+   yoffset += irb->mt->level[irb->mt_level].slice[irb->mt_layer].y_offset;
+
    dst_pitch = _mesa_image_row_stride(pack, width, format, type);
 
    /* For a window-system renderbuffer, the buffer is actually flipped
@@ -201,7 +188,7 @@ intel_readpixels_tiled_memcpy(struct gl_context * ctx,
       xoffset * cpp, (xoffset + width) * cpp,
       yoffset, yoffset + height,
       pixels - (ptrdiff_t) yoffset * dst_pitch - (ptrdiff_t) xoffset * cpp,
-      bo->virtual,
+      bo->virtual + irb->mt->offset,
       dst_pitch, irb->mt->pitch,
       brw->has_swizzling,
       irb->mt->tiling,
-- 
2.9.2