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i965/blorp: Add support for discard-based bounds checks to the NIR path

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Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
This commit is contained in:
Jason Ekstrand 2016-05-02 12:30:45 -07:00
parent 4bdace0791
commit 6adb8d6d3a
1 changed files with 18 additions and 1 deletions
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19
src/mesa/drivers/dri/i965/brw_blorp_blit.cpp
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@ -427,6 +427,23 @@ blorp_blit_apply_transform(nir_builder *b, nir_ssa_def *src_pos,
return pos;
}
static inline void
blorp_nir_discard_if_outside_rect(nir_builder *b, nir_ssa_def *pos,
struct brw_blorp_blit_vars *v)
{
nir_ssa_def *c0, *c1, *c2, *c3;
c0 = nir_ult(b, nir_channel(b, pos, 0), nir_load_var(b, v->u_dst_x0));
c1 = nir_uge(b, nir_channel(b, pos, 0), nir_load_var(b, v->u_dst_x1));
c2 = nir_ult(b, nir_channel(b, pos, 1), nir_load_var(b, v->u_dst_y0));
c3 = nir_uge(b, nir_channel(b, pos, 1), nir_load_var(b, v->u_dst_y1));
nir_ssa_def *oob = nir_ior(b, nir_ior(b, c0, c1), nir_ior(b, c2, c3));
nir_intrinsic_instr *discard =
nir_intrinsic_instr_create(b->shader, nir_intrinsic_discard_if);
discard->src[0] = nir_src_for_ssa(oob);
nir_builder_instr_insert(b, &discard->instr);
}
static nir_tex_instr *
blorp_create_nir_tex_instr(nir_shader *shader, nir_texop op,
nir_ssa_def *pos, unsigned num_srcs,
@ -785,7 +802,7 @@ brw_blorp_build_nir_shader(struct brw_context *brw,
* now is the time to do it.
*/
if (key->use_kill)
goto fail;
blorp_nir_discard_if_outside_rect(&b, dst_pos, &v);
src_pos = blorp_blit_apply_transform(&b, nir_i2f(&b, dst_pos), &v);