radeonsi: use si_nir_is_output_const_if_tex_is_const
When a blending mode producing "color = src * dst" is used and we can determine that dst is 1, then the draw call can dropped completely. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10979>
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@ -402,6 +402,13 @@ struct si_shader_info {
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* fragment shader invocations if flat shading.
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*/
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bool allow_flat_shading;
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/* Optimization: if the texture bound to this texunit has been cleared to 1,
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* then the draw can be skipped (see si_draw_vbo_skip_noop). Initially the
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* value is 0xff (undetermined) and can be later changed to 0 (= false) or
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* texunit + 1.
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*/
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uint8_t writes_1_if_tex_is_1;
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};
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/* A shader selector is a gallium CSO and contains shader variants and
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@ -418,6 +418,10 @@ void si_nir_scan_shader(const struct nir_shader *nir, struct si_shader_info *inf
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info->color_interpolate_loc[1] = nir->info.fs.color1_sample ? TGSI_INTERPOLATE_LOC_SAMPLE :
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nir->info.fs.color1_centroid ? TGSI_INTERPOLATE_LOC_CENTROID :
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TGSI_INTERPOLATE_LOC_CENTER;
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/* Set an invalid value. Will be determined at draw time if needed when the expected
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* conditions are met.
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*/
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info->writes_1_if_tex_is_1 = nir->info.writes_memory ? 0 : 0xff;
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}
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info->constbuf0_num_slots = nir->num_uniforms;
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@ -24,6 +24,7 @@
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#include "si_build_pm4.h"
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#include "si_query.h"
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#include "si_shader_internal.h"
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#include "sid.h"
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#include "util/fast_idiv_by_const.h"
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#include "util/format/u_format.h"
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@ -445,6 +446,14 @@ static void *si_create_blend_state_mode(struct pipe_context *ctx,
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blend->alpha_to_one = state->alpha_to_one;
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blend->dual_src_blend = util_blend_state_is_dual(state, 0);
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blend->logicop_enable = logicop_enable;
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blend->allows_noop_optimization =
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state->rt[0].rgb_func == PIPE_BLEND_ADD &&
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state->rt[0].alpha_func == PIPE_BLEND_ADD &&
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state->rt[0].rgb_src_factor == PIPE_BLENDFACTOR_DST_COLOR &&
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state->rt[0].alpha_src_factor == PIPE_BLENDFACTOR_DST_COLOR &&
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state->rt[0].rgb_dst_factor == PIPE_BLENDFACTOR_ZERO &&
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state->rt[0].alpha_dst_factor == PIPE_BLENDFACTOR_ZERO &&
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mode == V_028808_CB_NORMAL;
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unsigned num_shader_outputs = state->max_rt + 1; /* estimate */
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if (blend->dual_src_blend)
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@ -627,6 +636,57 @@ static void *si_create_blend_state(struct pipe_context *ctx, const struct pipe_b
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return si_create_blend_state_mode(ctx, state, V_028808_CB_NORMAL);
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}
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static void si_draw_blend_dst_sampler_noop(struct pipe_context *ctx,
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const struct pipe_draw_info *info,
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unsigned drawid_offset,
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const struct pipe_draw_indirect_info *indirect,
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const struct pipe_draw_start_count_bias *draws,
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unsigned num_draws) {
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struct si_context *sctx = (struct si_context *)ctx;
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if (sctx->framebuffer.state.nr_cbufs == 1) {
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struct si_shader_selector *sel = sctx->shader.ps.cso;
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bool free_nir;
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if (unlikely(sel->info.writes_1_if_tex_is_1 == 0xff)) {
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struct nir_shader *nir = si_get_nir_shader(sel, NULL, &free_nir);
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/* Determine if this fragment shader always writes vec4(1) if a specific texture
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* is all 1s.
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*/
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float in[4] = { 1.0, 1.0, 1.0, 1.0 };
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float out[4];
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int texunit;
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if (si_nir_is_output_const_if_tex_is_const(nir, in, out, &texunit) &&
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!memcmp(in, out, 4 * sizeof(float))) {
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sel->info.writes_1_if_tex_is_1 = 1 + texunit;
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} else {
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sel->info.writes_1_if_tex_is_1 = 0;
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}
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if (free_nir)
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ralloc_free(nir);
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}
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if (sel->info.writes_1_if_tex_is_1 &&
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sel->info.writes_1_if_tex_is_1 != 0xff) {
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/* Now check if the texture is cleared to 1 */
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int unit = sctx->shader.ps.cso->info.writes_1_if_tex_is_1 - 1;
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struct si_samplers *samp = &sctx->samplers[PIPE_SHADER_FRAGMENT];
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if ((1u << unit) & samp->enabled_mask) {
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struct si_texture* tex = (struct si_texture*) samp->views[unit]->texture;
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if (tex->is_depth &&
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tex->depth_cleared_level_mask & BITFIELD_BIT(samp->views[unit]->u.tex.first_level) &&
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tex->depth_clear_value[0] == 1) {
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return;
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}
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/* TODO: handle color textures */
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}
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}
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}
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sctx->real_draw_vbo(ctx, info, drawid_offset, indirect, draws, num_draws);
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}
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static void si_bind_blend_state(struct pipe_context *ctx, void *state)
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{
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struct si_context *sctx = (struct si_context *)ctx;
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@ -664,6 +724,14 @@ static void si_bind_blend_state(struct pipe_context *ctx, void *state)
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old_blend->commutative_4bit != blend->commutative_4bit ||
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old_blend->logicop_enable != blend->logicop_enable)))
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si_mark_atom_dirty(sctx, &sctx->atoms.s.msaa_config);
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if (likely(!radeon_uses_secure_bos(sctx->ws))) {
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if (unlikely(blend->allows_noop_optimization)) {
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si_install_draw_wrapper(sctx, si_draw_blend_dst_sampler_noop);
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} else {
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si_install_draw_wrapper(sctx, NULL);
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}
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}
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}
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static void si_delete_blend_state(struct pipe_context *ctx, void *state)
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@ -65,6 +65,7 @@ struct si_state_blend {
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bool alpha_to_one : 1;
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bool dual_src_blend : 1;
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bool logicop_enable : 1;
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bool allows_noop_optimization : 1;
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};
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struct si_state_rasterizer {
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