st/mesa: add support for layered framebuffers and consolidate code

This is a subset of geometry shaders. It's all about setting first_layer and
last_layer correctly.

Also some code between st_render_texture and update_framebuffer_state is
consolidated. It doesn't use rtt_level and derives the level from dimensions
instead as the code in st_atom_framebuffer.c did.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mesa/state_tracker/st_cb_readpixels.c b/src/mesa/state_tracker/st_cb_readpixels.c
index b5df58c033f..7547dfd8baf 100644
--- a/src/mesa/state_tracker/st_cb_readpixels.c
+++ b/src/mesa/state_tracker/st_cb_readpixels.c
@@ -166,7 +166,7 @@ st_readpixels(struct gl_context *ctx, GLint x, GLint y,
    }
 
    blit.src.resource = src;
-   blit.src.level = strb->rtt_level;
+   blit.src.level = strb->surface->u.tex.level;
    blit.src.format = src_format;
    blit.dst.resource = dst;
    blit.dst.level = 0;
@@ -175,7 +175,7 @@ st_readpixels(struct gl_context *ctx, GLint x, GLint y,
    blit.dst.box.x = 0;
    blit.src.box.y = y;
    blit.dst.box.y = 0;
-   blit.src.box.z = strb->rtt_face + strb->rtt_slice;
+   blit.src.box.z = strb->surface->u.tex.first_layer;
    blit.dst.box.z = 0;
    blit.src.box.width = blit.dst.box.width = width;
    blit.src.box.height = blit.dst.box.height = height;