nv50,nvc0: add support for cull distances

Cull distances are just a special case of clip distances as far as the
hardware is concerned. Make sure that the relevant "planes" are enabled,
and flip the clip mode to cull for those.

Signed-off-by: Tobias Klausmann <[email protected]>
[imirkin: add enables on nvc0, add nv50 support]
Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Tobias Klausmann <[email protected]>

1 files changed, 8 insertions, 1 deletions

diff --git a/src/gallium/drivers/nouveau/nv50/nv50_program.c b/src/gallium/drivers/nouveau/nv50/nv50_program.c
index 89db67f0524..648cb7314bf 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_program.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_program.c
@@ -319,7 +319,7 @@ nv50_program_translate(struct nv50_program *prog, uint16_t chipset,
                        struct pipe_debug_callback *debug)
 {
    struct nv50_ir_prog_info *info;
-   int ret;
+   int i, ret;
    const uint8_t map_undef = (prog->type == PIPE_SHADER_VERTEX) ? 0x40 : 0x80;
 
    info = CALLOC_STRUCT(nv50_ir_prog_info);
@@ -378,6 +378,13 @@ nv50_program_translate(struct nv50_program *prog, uint16_t chipset,
 
    prog->vp.need_vertex_id = info->io.vertexId < PIPE_MAX_SHADER_INPUTS;
 
+   prog->vp.clip_enable = (1 << info->io.clipDistances) - 1;
+   prog->vp.cull_enable =
+      ((1 << info->io.cullDistances) - 1) << info->io.clipDistances;
+   prog->vp.clip_mode = 0;
+   for (i = 0; i < info->io.cullDistances; ++i)
+      prog->vp.clip_mode |= 1 << ((info->io.clipDistances + i) * 4);
+
    if (prog->type == PIPE_SHADER_FRAGMENT) {
       if (info->prop.fp.writesDepth) {
          prog->fp.flags[0] |= NV50_3D_FP_CONTROL_EXPORTS_Z;