llvmpipe: add support for layered rendering

Mostly just make sure the layer parameter gets passed through to the right
places (and get clamped, can do this at setup time), fix up clears to
clear all layers and disable opaque optimization. Luckily don't need to
touch the jitted code.
(Clears invoked via pipe's clear_render_target method will not work however
since the pipe_util_clear function used for it doesn't handle clearing
multiple layers yet.)

v2: per Brian's suggestion, prettify var initialization and add some comments,
add assertion for impossible layer specification for surface.

Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Jose Fonseca <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_rast.h b/src/gallium/drivers/llvmpipe/lp_rast.h
index 9fe89e5b6f1..50917a7c633 100644
--- a/src/gallium/drivers/llvmpipe/lp_rast.h
+++ b/src/gallium/drivers/llvmpipe/lp_rast.h
@@ -86,8 +86,8 @@ struct lp_rast_shader_inputs {
    unsigned opaque:1;           /** Is opaque */
    unsigned pad0:29;            /* wasted space */
    unsigned stride;             /* how much to advance data between a0, dadx, dady */
+   unsigned layer;              /* the layer to render to (from gs, already clamped) */
    unsigned pad2;               /* wasted space */
-   unsigned pad3;               /* wasted space */
    /* followed by a0, dadx, dady and planes[] */
 };