i965: Handle default interpolation modes and locations in NIR.
This consolidates a bunch of hacks in a single place - by setting the interpolation modes and locations on variables appropriately, we can simply trust them in the rest of the code. This avoids having to handle INTERP_QUALIFIER_NONE, gl_Color overrides, sample-shading overrides, and Gen4-5 centroid-overrides in a bunch of places. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Matt Turner <mattst88@gmail.com> Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
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@ -1076,7 +1076,7 @@ fs_visitor::emit_linterp(const fs_reg &attr, const fs_reg &interp,
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bool is_centroid, bool is_sample)
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{
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brw_wm_barycentric_interp_mode barycoord_mode;
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if (devinfo->gen >= 6) {
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if (true) {
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if (is_centroid) {
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if (interpolation_mode == INTERP_QUALIFIER_SMOOTH)
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barycoord_mode = BRW_WM_PERSPECTIVE_CENTROID_BARYCENTRIC;
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@ -1093,12 +1093,6 @@ fs_visitor::emit_linterp(const fs_reg &attr, const fs_reg &interp,
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else
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barycoord_mode = BRW_WM_NONPERSPECTIVE_PIXEL_BARYCENTRIC;
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}
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} else {
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/* On Ironlake and below, there is only one interpolation mode.
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* Centroid interpolation doesn't mean anything on this hardware --
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* there is no multisampling.
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*/
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barycoord_mode = BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC;
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}
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return bld.emit(FS_OPCODE_LINTERP, attr,
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this->delta_xy[barycoord_mode], interp);
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@ -1113,17 +1107,6 @@ fs_visitor::emit_general_interpolation(fs_reg *attr, const char *name,
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{
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assert(stage == MESA_SHADER_FRAGMENT);
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brw_wm_prog_data *prog_data = (brw_wm_prog_data*) this->prog_data;
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brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
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if (interpolation_mode == INTERP_QUALIFIER_NONE) {
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bool is_gl_Color =
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*location == VARYING_SLOT_COL0 || *location == VARYING_SLOT_COL1;
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if (key->flat_shade && is_gl_Color) {
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interpolation_mode = INTERP_QUALIFIER_FLAT;
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} else {
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interpolation_mode = INTERP_QUALIFIER_SMOOTH;
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}
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}
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if (type->is_array() || type->is_matrix()) {
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const glsl_type *elem_type = glsl_get_array_element(type);
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@ -1197,8 +1180,7 @@ fs_visitor::emit_general_interpolation(fs_reg *attr, const char *name,
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inst->no_dd_clear = true;
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inst = emit_linterp(*attr, fs_reg(interp), interpolation_mode,
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mod_centroid && !key->persample_interp,
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mod_sample || key->persample_interp);
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mod_centroid, mod_sample);
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inst->predicate = BRW_PREDICATE_NORMAL;
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inst->predicate_inverse = false;
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if (devinfo->has_pln)
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@ -1206,8 +1188,7 @@ fs_visitor::emit_general_interpolation(fs_reg *attr, const char *name,
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} else {
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emit_linterp(*attr, fs_reg(interp), interpolation_mode,
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mod_centroid && !key->persample_interp,
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mod_sample || key->persample_interp);
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mod_centroid, mod_sample);
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}
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if (devinfo->gen < 6 && interpolation_mode == INTERP_QUALIFIER_SMOOTH) {
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bld.MUL(*attr, *attr, this->pixel_w);
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@ -6347,8 +6328,6 @@ fs_visitor::run_cs()
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*/
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static unsigned
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brw_compute_barycentric_interp_modes(const struct brw_device_info *devinfo,
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bool shade_model_flat,
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bool persample_shading,
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const nir_shader *shader)
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{
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unsigned barycentric_interp_modes = 0;
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@ -6356,10 +6335,8 @@ brw_compute_barycentric_interp_modes(const struct brw_device_info *devinfo,
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nir_foreach_variable(var, &shader->inputs) {
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enum glsl_interp_qualifier interp_qualifier =
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(enum glsl_interp_qualifier)var->data.interpolation;
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bool is_centroid = var->data.centroid && !persample_shading;
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bool is_sample = var->data.sample || persample_shading;
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bool is_gl_Color = (var->data.location == VARYING_SLOT_COL0) ||
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(var->data.location == VARYING_SLOT_COL1);
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bool is_centroid = var->data.centroid;
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bool is_sample = var->data.sample;
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/* Ignore WPOS and FACE, because they don't require interpolation. */
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if (var->data.location == VARYING_SLOT_POS ||
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@ -6385,9 +6362,7 @@ brw_compute_barycentric_interp_modes(const struct brw_device_info *devinfo,
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barycentric_interp_modes |=
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1 << BRW_WM_NONPERSPECTIVE_PIXEL_BARYCENTRIC;
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}
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} else if (interp_qualifier == INTERP_QUALIFIER_SMOOTH ||
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(!(shade_model_flat && is_gl_Color) &&
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interp_qualifier == INTERP_QUALIFIER_NONE)) {
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} else if (interp_qualifier == INTERP_QUALIFIER_SMOOTH) {
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if (is_centroid) {
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barycentric_interp_modes |=
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1 << BRW_WM_PERSPECTIVE_CENTROID_BARYCENTRIC;
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@ -6408,25 +6383,18 @@ brw_compute_barycentric_interp_modes(const struct brw_device_info *devinfo,
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static void
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brw_compute_flat_inputs(struct brw_wm_prog_data *prog_data,
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bool shade_model_flat, const nir_shader *shader)
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const nir_shader *shader)
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{
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prog_data->flat_inputs = 0;
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nir_foreach_variable(var, &shader->inputs) {
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enum glsl_interp_qualifier interp_qualifier =
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(enum glsl_interp_qualifier)var->data.interpolation;
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bool is_gl_Color = (var->data.location == VARYING_SLOT_COL0) ||
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(var->data.location == VARYING_SLOT_COL1);
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int input_index = prog_data->urb_setup[var->data.location];
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if (input_index < 0)
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continue;
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/* flat shading */
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if (interp_qualifier == INTERP_QUALIFIER_FLAT ||
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(shade_model_flat && is_gl_Color &&
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interp_qualifier == INTERP_QUALIFIER_NONE))
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if (var->data.interpolation == INTERP_QUALIFIER_FLAT)
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prog_data->flat_inputs |= (1 << input_index);
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}
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}
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@ -6450,6 +6418,50 @@ computed_depth_mode(const nir_shader *shader)
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return BRW_PSCDEPTH_OFF;
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}
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/**
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* Apply default interpolation settings to FS inputs which don't specify any.
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*/
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static void
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brw_nir_set_default_interpolation(const struct brw_device_info *devinfo,
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struct nir_shader *nir,
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bool api_flat_shade,
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bool per_sample_interpolation)
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{
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assert(nir->stage == MESA_SHADER_FRAGMENT);
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nir_foreach_variable(var, &nir->inputs) {
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/* Apply default interpolation mode.
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*
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* Everything defaults to smooth except for the legacy GL color
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* built-in variables, which might be flat depending on API state.
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*/
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if (var->data.interpolation == INTERP_QUALIFIER_NONE) {
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const bool flat = api_flat_shade &&
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(var->data.location == VARYING_SLOT_COL0 ||
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var->data.location == VARYING_SLOT_COL1);
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var->data.interpolation = flat ? INTERP_QUALIFIER_FLAT
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: INTERP_QUALIFIER_SMOOTH;
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}
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/* Apply 'sample' if necessary for API state. */
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if (per_sample_interpolation &&
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var->data.interpolation != INTERP_QUALIFIER_FLAT) {
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var->data.centroid = false;
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var->data.sample = true;
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}
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/* On Ironlake and below, there is only one interpolation mode.
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* Centroid interpolation doesn't mean anything on this hardware --
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* there is no multisampling.
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*/
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if (devinfo->gen < 6) {
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var->data.centroid = false;
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var->data.sample = false;
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}
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}
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}
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const unsigned *
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brw_compile_fs(const struct brw_compiler *compiler, void *log_data,
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void *mem_ctx,
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nir_shader *shader = nir_shader_clone(mem_ctx, src_shader);
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shader = brw_nir_apply_sampler_key(shader, compiler->devinfo, &key->tex,
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true);
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brw_nir_set_default_interpolation(compiler->devinfo, shader,
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key->flat_shade, key->persample_interp);
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brw_nir_lower_fs_inputs(shader);
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brw_nir_lower_fs_outputs(shader);
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shader = brw_postprocess_nir(shader, compiler->devinfo, true);
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@ -6490,10 +6504,7 @@ brw_compile_fs(const struct brw_compiler *compiler, void *log_data,
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prog_data->early_fragment_tests = shader->info.fs.early_fragment_tests;
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prog_data->barycentric_interp_modes =
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brw_compute_barycentric_interp_modes(compiler->devinfo,
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key->flat_shade,
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key->persample_interp,
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shader);
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brw_compute_barycentric_interp_modes(compiler->devinfo, shader);
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cfg_t *simd8_cfg = NULL, *simd16_cfg = NULL;
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uint8_t simd8_grf_start = 0, simd16_grf_start = 0;
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@ -6565,7 +6576,7 @@ brw_compile_fs(const struct brw_compiler *compiler, void *log_data,
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* because it relies on prog_data->urb_setup which is computed in
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* fs_visitor::calculate_urb_setup().
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*/
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brw_compute_flat_inputs(prog_data, key->flat_shade, shader);
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brw_compute_flat_inputs(prog_data, shader);
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fs_generator g(compiler, log_data, mem_ctx, (void *) key, &prog_data->base,
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v8.promoted_constants, v8.runtime_check_aads_emit,
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