diff options
Diffstat (limited to 'src/gallium/drivers/vc4/vc4_nir_lower_blend.c')
| -rw-r--r-- | src/gallium/drivers/vc4/vc4_nir_lower_blend.c | 132 |
1 files changed, 116 insertions, 16 deletions
diff --git a/src/gallium/drivers/vc4/vc4_nir_lower_blend.c b/src/gallium/drivers/vc4/vc4_nir_lower_blend.c index 0672a92226f..38676cff6b7 100644 --- a/src/gallium/drivers/vc4/vc4_nir_lower_blend.c +++ b/src/gallium/drivers/vc4/vc4_nir_lower_blend.c @@ -29,6 +29,10 @@ * from the tile buffer after having waited for the scoreboard (which is * handled by vc4_qpu_emit.c), then do math using your output color and that * destination value, and update the output color appropriately. + * + * Once this pass is done, the color write will either have one component (for + * single sample) with packed argb8888, or 4 components with the per-sample + * argb8888 result. */ /** @@ -40,15 +44,23 @@ #include "glsl/nir/nir_builder.h" #include "vc4_context.h" +static bool +blend_depends_on_dst_color(struct vc4_compile *c) +{ + return (c->fs_key->blend.blend_enable || + c->fs_key->blend.colormask != 0xf || + c->fs_key->logicop_func != PIPE_LOGICOP_COPY); +} + /** Emits a load of the previous fragment color from the tile buffer. */ static nir_ssa_def * -vc4_nir_get_dst_color(nir_builder *b) +vc4_nir_get_dst_color(nir_builder *b, int sample) { nir_intrinsic_instr *load = nir_intrinsic_instr_create(b->shader, nir_intrinsic_load_input); load->num_components = 1; - load->const_index[0] = VC4_NIR_TLB_COLOR_READ_INPUT; + load->const_index[0] = VC4_NIR_TLB_COLOR_READ_INPUT + sample; nir_ssa_dest_init(&load->instr, &load->dest, 1, NULL); nir_builder_instr_insert(b, &load->instr); return &load->dest.ssa; @@ -496,23 +508,26 @@ vc4_nir_swizzle_and_pack(struct vc4_compile *c, nir_builder *b, } -static void -vc4_nir_lower_blend_instr(struct vc4_compile *c, nir_builder *b, - nir_intrinsic_instr *intr) +static nir_ssa_def * +vc4_nir_blend_pipeline(struct vc4_compile *c, nir_builder *b, nir_ssa_def *src, + int sample) { enum pipe_format color_format = c->fs_key->color_format; const uint8_t *format_swiz = vc4_get_format_swizzle(color_format); bool srgb = util_format_is_srgb(color_format); /* Pull out the float src/dst color components. */ - nir_ssa_def *packed_dst_color = vc4_nir_get_dst_color(b); + nir_ssa_def *packed_dst_color = vc4_nir_get_dst_color(b, sample); nir_ssa_def *dst_vec4 = nir_unpack_unorm_4x8(b, packed_dst_color); nir_ssa_def *src_color[4], *unpacked_dst_color[4]; for (unsigned i = 0; i < 4; i++) { - src_color[i] = nir_channel(b, intr->src[0].ssa, i); + src_color[i] = nir_channel(b, src, i); unpacked_dst_color[i] = nir_channel(b, dst_vec4, i); } + if (c->fs_key->sample_alpha_to_one && c->fs_key->msaa) + src_color[3] = nir_imm_float(b, 1.0); + vc4_nir_emit_alpha_test_discard(c, b, src_color[3]); nir_ssa_def *packed_color; @@ -560,16 +575,101 @@ vc4_nir_lower_blend_instr(struct vc4_compile *c, nir_builder *b, colormask &= ~(0xff << (i * 8)); } } - packed_color = nir_ior(b, - nir_iand(b, packed_color, - nir_imm_int(b, colormask)), - nir_iand(b, packed_dst_color, - nir_imm_int(b, ~colormask))); - /* Turn the old vec4 output into a store of the packed color. */ - nir_instr_rewrite_src(&intr->instr, &intr->src[0], - nir_src_for_ssa(packed_color)); + return nir_ior(b, + nir_iand(b, packed_color, + nir_imm_int(b, colormask)), + nir_iand(b, packed_dst_color, + nir_imm_int(b, ~colormask))); +} + +static int +vc4_nir_next_output_driver_location(nir_shader *s) +{ + int maxloc = -1; + + nir_foreach_variable(var, &s->inputs) + maxloc = MAX2(maxloc, var->data.driver_location); + + return maxloc; +} + +static void +vc4_nir_store_sample_mask(struct vc4_compile *c, nir_builder *b, + nir_ssa_def *val) +{ + nir_variable *sample_mask = nir_variable_create(c->s, nir_var_shader_out, + glsl_uint_type(), + "sample_mask"); + sample_mask->data.driver_location = + vc4_nir_next_output_driver_location(c->s); + sample_mask->data.location = FRAG_RESULT_SAMPLE_MASK; + exec_list_push_tail(&c->s->outputs, &sample_mask->node); + + nir_intrinsic_instr *intr = + nir_intrinsic_instr_create(c->s, nir_intrinsic_store_output); intr->num_components = 1; + intr->const_index[0] = sample_mask->data.location; + + intr->src[0] = nir_src_for_ssa(val); + nir_builder_instr_insert(b, &intr->instr); +} + +static void +vc4_nir_lower_blend_instr(struct vc4_compile *c, nir_builder *b, + nir_intrinsic_instr *intr) +{ + nir_ssa_def *frag_color = intr->src[0].ssa; + + if (c->fs_key->sample_coverage) { + nir_intrinsic_instr *load = + nir_intrinsic_instr_create(b->shader, + nir_intrinsic_load_sample_mask_in); + load->num_components = 1; + nir_ssa_dest_init(&load->instr, &load->dest, 1, NULL); + nir_builder_instr_insert(b, &load->instr); + + nir_ssa_def *bitmask = &load->dest.ssa; + + vc4_nir_store_sample_mask(c, b, bitmask); + } else if (c->fs_key->sample_alpha_to_coverage) { + nir_ssa_def *a = nir_channel(b, frag_color, 3); + + /* XXX: We should do a nice dither based on the fragment + * coordinate, instead. + */ + nir_ssa_def *num_samples = nir_imm_float(b, VC4_MAX_SAMPLES); + nir_ssa_def *num_bits = nir_f2i(b, nir_fmul(b, a, num_samples)); + nir_ssa_def *bitmask = nir_isub(b, + nir_ishl(b, + nir_imm_int(b, 1), + num_bits), + nir_imm_int(b, 1)); + vc4_nir_store_sample_mask(c, b, bitmask); + } + + /* The TLB color read returns each sample in turn, so if our blending + * depends on the destination color, we're going to have to run the + * blending function separately for each destination sample value, and + * then output the per-sample color using TLB_COLOR_MS. + */ + nir_ssa_def *blend_output; + if (c->fs_key->msaa && blend_depends_on_dst_color(c)) { + c->msaa_per_sample_output = true; + + nir_ssa_def *samples[4]; + for (int i = 0; i < VC4_MAX_SAMPLES; i++) + samples[i] = vc4_nir_blend_pipeline(c, b, frag_color, i); + blend_output = nir_vec4(b, + samples[0], samples[1], + samples[2], samples[3]); + } else { + blend_output = vc4_nir_blend_pipeline(c, b, frag_color, 0); + } + + nir_instr_rewrite_src(&intr->instr, &intr->src[0], + nir_src_for_ssa(blend_output)); + intr->num_components = blend_output->num_components; } static bool @@ -577,7 +677,7 @@ vc4_nir_lower_blend_block(nir_block *block, void *state) { struct vc4_compile *c = state; - nir_foreach_instr(block, instr) { + nir_foreach_instr_safe(block, instr) { if (instr->type != nir_instr_type_intrinsic) continue; nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr); |