static bool
lower_offset(nir_builder *b, nir_tex_instr *tex)
{
int offset_index = nir_tex_instr_src_index(tex, nir_tex_src_offset);
if (offset_index < 0)
return false;
int coord_index = nir_tex_instr_src_index(tex, nir_tex_src_coord);
assert(coord_index >= 0);
assert(tex->src[offset_index].src.is_ssa);
assert(tex->src[coord_index].src.is_ssa);
nir_ssa_def *offset = tex->src[offset_index].src.ssa;
nir_ssa_def *coord = tex->src[coord_index].src.ssa;
b->cursor = nir_before_instr(&tex->instr);
nir_ssa_def *offset_coord;
if (nir_tex_instr_src_type(tex, coord_index) == nir_type_float) {
if (tex->sampler_dim == GLSL_SAMPLER_DIM_RECT) {
offset_coord = nir_fadd(b, coord, nir_i2f32(b, offset));
} else {
nir_ssa_def *txs = get_texture_size(b, tex);
nir_ssa_def *scale = nir_frcp(b, txs);
offset_coord = nir_fadd(b, coord,
nir_fmul(b,
nir_i2f32(b, offset),
scale));
}
} else {
offset_coord = nir_iadd(b, coord, offset);
}
if (tex->is_array) {
/* The offset is not applied to the array index */
if (tex->coord_components == 2) {
offset_coord = nir_vec2(b, nir_channel(b, offset_coord, 0),
nir_channel(b, coord, 1));
} else if (tex->coord_components == 3) {
offset_coord = nir_vec3(b, nir_channel(b, offset_coord, 0),
nir_channel(b, offset_coord, 1),
nir_channel(b, coord, 2));
} else {
unreachable("Invalid number of components");
}
}
nir_instr_rewrite_src(&tex->instr, &tex->src[coord_index].src,
nir_src_for_ssa(offset_coord));
nir_tex_instr_remove_src(tex, offset_index);
return true;
}
/* Multiply interp_var_at_offset's offset by transform.x to flip it. */
static void
lower_interp_var_at_offset(lower_wpos_ytransform_state *state,
nir_intrinsic_instr *interp)
{
nir_builder *b = &state->b;
nir_ssa_def *offset;
nir_ssa_def *flip_y;
b->cursor = nir_before_instr(&interp->instr);
offset = nir_ssa_for_src(b, interp->src[0], 2);
flip_y = nir_fmul(b, nir_channel(b, offset, 1),
nir_channel(b, get_transform(state), 0));
nir_instr_rewrite_src(&interp->instr, &interp->src[0],
nir_src_for_ssa(nir_vec2(b, nir_channel(b, offset, 0),
flip_y)));
}
static void
lower_load_sample_pos(lower_wpos_ytransform_state *state,
nir_intrinsic_instr *intr)
{
nir_builder *b = &state->b;
b->cursor = nir_after_instr(&intr->instr);
nir_ssa_def *pos = &intr->dest.ssa;
nir_ssa_def *scale = nir_channel(b, get_transform(state), 0);
nir_ssa_def *neg_scale = nir_channel(b, get_transform(state), 2);
/* Either y or 1-y for scale equal to 1 or -1 respectively. */
nir_ssa_def *flipped_y =
nir_fadd(b, nir_fmax(b, neg_scale, nir_imm_float(b, 0.0)),
nir_fmul(b, nir_channel(b, pos, 1), scale));
nir_ssa_def *flipped_pos = nir_vec2(b, nir_channel(b, pos, 0), flipped_y);
nir_ssa_def_rewrite_uses_after(&intr->dest.ssa, nir_src_for_ssa(flipped_pos),
flipped_pos->parent_instr);
}
static void
lower_load_pointcoord(lower_wpos_ytransform_state *state,
nir_intrinsic_instr *intr)
{
nir_builder *b = &state->b;
b->cursor = nir_after_instr(&intr->instr);
nir_ssa_def *pntc = &intr->dest.ssa;
nir_ssa_def *transform = get_transform(state);
nir_ssa_def *y = nir_channel(b, pntc, 1);
/* The offset is 1 if we're flipping, 0 otherwise. */
nir_ssa_def *offset = nir_fmax(b, nir_channel(b, transform, 2),
nir_imm_float(b, 0.0));
/* Flip the sign of y if we're flipping. */
nir_ssa_def *scaled = nir_fmul(b, y, nir_channel(b, transform, 0));
/* Reassemble the vector. */
nir_ssa_def *flipped_pntc = nir_vec2(b,
nir_channel(b, pntc, 0),
nir_fadd(b, offset, scaled));
nir_ssa_def_rewrite_uses_after(&intr->dest.ssa, nir_src_for_ssa(flipped_pntc),
flipped_pntc->parent_instr);
}
static void
project_src(nir_builder *b, nir_tex_instr *tex)
{
/* Find the projector in the srcs list, if present. */
int proj_index = nir_tex_instr_src_index(tex, nir_tex_src_projector);
if (proj_index < 0)
return;
b->cursor = nir_before_instr(&tex->instr);
nir_ssa_def *inv_proj =
nir_frcp(b, nir_ssa_for_src(b, tex->src[proj_index].src, 1));
/* Walk through the sources projecting the arguments. */
for (unsigned i = 0; i < tex->num_srcs; i++) {
switch (tex->src[i].src_type) {
case nir_tex_src_coord:
case nir_tex_src_comparator:
break;
default:
continue;
}
nir_ssa_def *unprojected =
nir_ssa_for_src(b, tex->src[i].src, nir_tex_instr_src_size(tex, i));
nir_ssa_def *projected = nir_fmul(b, unprojected, inv_proj);
/* Array indices don't get projected, so make an new vector with the
* coordinate's array index untouched.
*/
if (tex->is_array && tex->src[i].src_type == nir_tex_src_coord) {
switch (tex->coord_components) {
case 4:
projected = nir_vec4(b,
nir_channel(b, projected, 0),
nir_channel(b, projected, 1),
nir_channel(b, projected, 2),
nir_channel(b, unprojected, 3));
break;
case 3:
projected = nir_vec3(b,
nir_channel(b, projected, 0),
nir_channel(b, projected, 1),
nir_channel(b, unprojected, 2));
break;
case 2:
projected = nir_vec2(b,
nir_channel(b, projected, 0),
nir_channel(b, unprojected, 1));
break;
default:
unreachable("bad texture coord count for array");
break;
}
}
nir_instr_rewrite_src(&tex->instr,
&tex->src[i].src,
nir_src_for_ssa(projected));
}
nir_tex_instr_remove_src(tex, proj_index);
}
static void
vc4_nir_lower_txf_ms_instr(struct vc4_compile *c, nir_builder *b,
nir_tex_instr *txf_ms)
{
if (txf_ms->op != nir_texop_txf_ms)
return;
b->cursor = nir_before_instr(&txf_ms->instr);
nir_tex_instr *txf = nir_tex_instr_create(c->s, 1);
txf->op = nir_texop_txf;
txf->sampler = txf_ms->sampler;
txf->sampler_index = txf_ms->sampler_index;
txf->coord_components = txf_ms->coord_components;
txf->is_shadow = txf_ms->is_shadow;
txf->is_new_style_shadow = txf_ms->is_new_style_shadow;
nir_ssa_def *coord = NULL, *sample_index = NULL;
for (int i = 0; i < txf_ms->num_srcs; i++) {
assert(txf_ms->src[i].src.is_ssa);
switch (txf_ms->src[i].src_type) {
case nir_tex_src_coord:
coord = txf_ms->src[i].src.ssa;
break;
case nir_tex_src_ms_index:
sample_index = txf_ms->src[i].src.ssa;
break;
default:
unreachable("Unknown txf_ms src\n");
}
}
assert(coord);
assert(sample_index);
nir_ssa_def *x = nir_channel(b, coord, 0);
nir_ssa_def *y = nir_channel(b, coord, 1);
uint32_t tile_w = 32;
uint32_t tile_h = 32;
uint32_t tile_w_shift = 5;
uint32_t tile_h_shift = 5;
uint32_t tile_size = (tile_h * tile_w *
VC4_MAX_SAMPLES * sizeof(uint32_t));
unsigned unit = txf_ms->sampler_index;
uint32_t w = align(c->key->tex[unit].msaa_width, tile_w);
uint32_t w_tiles = w / tile_w;
nir_ssa_def *x_tile = nir_ushr(b, x, nir_imm_int(b, tile_w_shift));
nir_ssa_def *y_tile = nir_ushr(b, y, nir_imm_int(b, tile_h_shift));
nir_ssa_def *tile_addr = nir_iadd(b,
nir_imul(b, x_tile,
nir_imm_int(b, tile_size)),
nir_imul(b, y_tile,
nir_imm_int(b, (w_tiles *
tile_size))));
nir_ssa_def *x_subspan = nir_iand(b, x,
nir_imm_int(b, (tile_w - 1) & ~1));
nir_ssa_def *y_subspan = nir_iand(b, y,
nir_imm_int(b, (tile_h - 1) & ~1));
nir_ssa_def *subspan_addr = nir_iadd(b,
nir_imul(b, x_subspan,
nir_imm_int(b, 2 * VC4_MAX_SAMPLES * sizeof(uint32_t))),
nir_imul(b, y_subspan,
nir_imm_int(b,
tile_w *
VC4_MAX_SAMPLES *
sizeof(uint32_t))));
nir_ssa_def *pixel_addr = nir_ior(b,
nir_iand(b,
nir_ishl(b, x,
nir_imm_int(b, 2)),
nir_imm_int(b, (1 << 2))),
nir_iand(b,
nir_ishl(b, y,
nir_imm_int(b, 3)),
nir_imm_int(b, (1 << 3))));
nir_ssa_def *sample_addr = nir_ishl(b, sample_index, nir_imm_int(b, 4));
nir_ssa_def *addr = nir_iadd(b,
nir_ior(b, sample_addr, pixel_addr),
nir_iadd(b, subspan_addr, tile_addr));
txf->src[0].src_type = nir_tex_src_coord;
txf->src[0].src = nir_src_for_ssa(nir_vec2(b, addr, nir_imm_int(b, 0)));
nir_ssa_dest_init(&txf->instr, &txf->dest, 4, NULL);
nir_builder_instr_insert(b, &txf->instr);
nir_ssa_def_rewrite_uses(&txf_ms->dest.ssa,
nir_src_for_ssa(&txf->dest.ssa));
nir_instr_remove(&txf_ms->instr);
}
