nir: rewrite varying component packing
There are a number of reasons for the rewrite. 1. Adding support for packing tess patch varyings in a sane way. 2. Making use of qsort allowing the code to be much easier to follow. 3. Fixes a bug where different interp types caused component packing to be skipped for all varyings in some scenarios. 4. Allows us to add a crude live range analysis for deciding which components should be packed together. This support can optionally be added in a future patch. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
parent
2f53260417
commit
26aa460940
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@ -238,22 +238,29 @@ is_packing_supported_for_type(const struct glsl_type *type)
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return glsl_type_is_scalar(type) && glsl_type_is_32bit(type);
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return glsl_type_is_scalar(type) && glsl_type_is_32bit(type);
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}
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}
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struct assigned_comps
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{
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uint8_t comps;
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uint8_t interp_type;
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uint8_t interp_loc;
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};
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/* Packing arrays and dual slot varyings is difficult so to avoid complex
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* algorithms this function just assigns them their existing location for now.
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* TODO: allow better packing of complex types.
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*/
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static void
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static void
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get_slot_component_masks_and_interp_types(struct exec_list *var_list,
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get_unmoveable_components_masks(struct exec_list *var_list,
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uint8_t *comps,
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struct assigned_comps *comps,
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uint8_t *interp_type,
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gl_shader_stage stage,
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uint8_t *interp_loc,
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bool default_to_smooth_interp)
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gl_shader_stage stage,
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bool default_to_smooth_interp)
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{
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{
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nir_foreach_variable_safe(var, var_list) {
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nir_foreach_variable_safe(var, var_list) {
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assert(var->data.location >= 0);
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assert(var->data.location >= 0);
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/* Only remap things that aren't built-ins.
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/* Only remap things that aren't built-ins. */
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* TODO: add TES patch support.
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*/
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if (var->data.location >= VARYING_SLOT_VAR0 &&
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if (var->data.location >= VARYING_SLOT_VAR0 &&
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var->data.location - VARYING_SLOT_VAR0 < 32) {
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var->data.location - VARYING_SLOT_VAR0 < MAX_VARYINGS_INCL_PATCH) {
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const struct glsl_type *type = var->type;
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const struct glsl_type *type = var->type;
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if (nir_is_per_vertex_io(var, stage)) {
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if (nir_is_per_vertex_io(var, stage)) {
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@ -261,37 +268,44 @@ get_slot_component_masks_and_interp_types(struct exec_list *var_list,
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type = glsl_get_array_element(type);
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type = glsl_get_array_element(type);
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}
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}
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/* If we can pack this varying then don't mark the components as
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* used.
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*/
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if (is_packing_supported_for_type(type))
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continue;
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unsigned location = var->data.location - VARYING_SLOT_VAR0;
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unsigned location = var->data.location - VARYING_SLOT_VAR0;
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unsigned elements =
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unsigned elements =
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glsl_get_vector_elements(glsl_without_array(type));
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glsl_get_vector_elements(glsl_without_array(type));
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bool dual_slot = glsl_type_is_dual_slot(glsl_without_array(type));
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bool dual_slot = glsl_type_is_dual_slot(glsl_without_array(type));
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unsigned slots = glsl_count_attribute_slots(type, false);
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unsigned slots = glsl_count_attribute_slots(type, false);
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unsigned dmul = glsl_type_is_64bit(glsl_without_array(type)) ? 2 : 1;
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unsigned comps_slot2 = 0;
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unsigned comps_slot2 = 0;
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for (unsigned i = 0; i < slots; i++) {
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for (unsigned i = 0; i < slots; i++) {
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interp_type[location + i] =
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get_interp_type(var, type, default_to_smooth_interp);
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interp_loc[location + i] = get_interp_loc(var);
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if (dual_slot) {
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if (dual_slot) {
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if (i & 1) {
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if (i & 1) {
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comps[location + i] |= ((1 << comps_slot2) - 1);
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comps[location + i].comps |= ((1 << comps_slot2) - 1);
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} else {
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} else {
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unsigned num_comps = 4 - var->data.location_frac;
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unsigned num_comps = 4 - var->data.location_frac;
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comps_slot2 = (elements * 2) - num_comps;
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comps_slot2 = (elements * dmul) - num_comps;
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/* Assume ARB_enhanced_layouts packing rules for doubles */
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/* Assume ARB_enhanced_layouts packing rules for doubles */
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assert(var->data.location_frac == 0 ||
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assert(var->data.location_frac == 0 ||
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var->data.location_frac == 2);
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var->data.location_frac == 2);
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assert(comps_slot2 <= 4);
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assert(comps_slot2 <= 4);
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comps[location + i] |=
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comps[location + i].comps |=
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((1 << num_comps) - 1) << var->data.location_frac;
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((1 << num_comps) - 1) << var->data.location_frac;
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}
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}
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} else {
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} else {
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comps[location + i] |=
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comps[location + i].comps |=
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((1 << elements) - 1) << var->data.location_frac;
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((1 << (elements * dmul)) - 1) << var->data.location_frac;
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}
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}
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comps[location + i].interp_type =
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get_interp_type(var, type, default_to_smooth_interp);
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comps[location + i].interp_loc = get_interp_loc(var);
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}
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}
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}
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}
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}
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}
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@ -403,32 +417,55 @@ remap_slots_and_components(struct exec_list *var_list, gl_shader_stage stage,
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*p_out_slots_read = out_slots_read_tmp[1];
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*p_out_slots_read = out_slots_read_tmp[1];
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}
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}
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/* If there are empty components in the slot compact the remaining components
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struct varying_component {
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* as close to component 0 as possible. This will make it easier to fill the
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nir_variable *var;
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* empty components with components from a different slot in a following pass.
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uint8_t interp_type;
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*/
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uint8_t interp_loc;
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static void
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bool is_patch;
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compact_components(nir_shader *producer, nir_shader *consumer, uint8_t *comps,
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bool initialised;
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uint8_t *interp_type, uint8_t *interp_loc,
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};
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bool default_to_smooth_interp)
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static int
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cmp_varying_component(const void *comp1_v, const void *comp2_v)
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{
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{
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struct exec_list *input_list = &consumer->inputs;
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struct varying_component *comp1 = (struct varying_component *) comp1_v;
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struct exec_list *output_list = &producer->outputs;
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struct varying_component *comp2 = (struct varying_component *) comp2_v;
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struct varying_loc remap[MAX_VARYINGS_INCL_PATCH][4] = {{{0}, {0}}};
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/* Create a cursor for each interpolation type */
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/* We want patches to be order at the end of the array */
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unsigned cursor[4] = {0};
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if (comp1->is_patch != comp2->is_patch)
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return comp1->is_patch ? 1 : -1;
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/* We only need to pass over one stage and we choose the consumer as it seems
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/* We can only pack varyings with matching interpolation types so group
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* to cause a larger reduction in instruction counts (tested on i965).
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* them together.
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*/
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*/
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nir_foreach_variable(var, input_list) {
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if (comp1->interp_type != comp2->interp_type)
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return comp1->interp_type - comp2->interp_type;
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/* Only remap things that aren't builtins.
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/* Interpolation loc must match also. */
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* TODO: add TES patch support.
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if (comp1->interp_loc != comp2->interp_loc)
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*/
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return comp1->interp_loc - comp2->interp_loc;
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/* If everything else matches just use the original location to sort */
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return comp1->var->data.location - comp2->var->data.location;
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}
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static void
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gather_varying_component_info(nir_shader *consumer,
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struct varying_component **varying_comp_info,
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unsigned *varying_comp_info_size,
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bool default_to_smooth_interp)
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{
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unsigned store_varying_info_idx[MAX_VARYINGS_INCL_PATCH][4] = {0};
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unsigned num_of_comps_to_pack = 0;
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/* Count the number of varying that can be packed and create a mapping
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* of those varyings to the array we will pass to qsort.
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*/
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nir_foreach_variable(var, &consumer->inputs) {
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/* Only remap things that aren't builtins. */
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if (var->data.location >= VARYING_SLOT_VAR0 &&
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if (var->data.location >= VARYING_SLOT_VAR0 &&
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var->data.location - VARYING_SLOT_VAR0 < 32) {
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var->data.location - VARYING_SLOT_VAR0 < MAX_VARYINGS_INCL_PATCH) {
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/* We can't repack xfb varyings. */
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/* We can't repack xfb varyings. */
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if (var->data.always_active_io)
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if (var->data.always_active_io)
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@ -443,72 +480,191 @@ compact_components(nir_shader *producer, nir_shader *consumer, uint8_t *comps,
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if (!is_packing_supported_for_type(type))
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if (!is_packing_supported_for_type(type))
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continue;
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continue;
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unsigned location = var->data.location - VARYING_SLOT_VAR0;
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unsigned loc = var->data.location - VARYING_SLOT_VAR0;
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uint8_t used_comps = comps[location];
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store_varying_info_idx[loc][var->data.location_frac] =
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++num_of_comps_to_pack;
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}
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}
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/* If there are no empty components there is nothing more for us to do.
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*varying_comp_info_size = num_of_comps_to_pack;
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*/
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*varying_comp_info = rzalloc_array(NULL, struct varying_component,
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if (used_comps == 0xf)
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num_of_comps_to_pack);
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nir_function_impl *impl = nir_shader_get_entrypoint(consumer);
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/* Walk over the shader and populate the varying component info array */
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nir_foreach_block(block, impl) {
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nir_foreach_instr(instr, block) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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continue;
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bool found_new_offset = false;
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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uint8_t interp = get_interp_type(var, type, default_to_smooth_interp);
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if (intr->intrinsic != nir_intrinsic_load_deref &&
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for (; cursor[interp] < 32; cursor[interp]++) {
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intr->intrinsic != nir_intrinsic_interp_deref_at_centroid &&
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uint8_t cursor_used_comps = comps[cursor[interp]];
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intr->intrinsic != nir_intrinsic_interp_deref_at_sample &&
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intr->intrinsic != nir_intrinsic_interp_deref_at_offset)
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continue;
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/* We couldn't find anywhere to pack the varying continue on. */
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nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
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if (cursor[interp] == location &&
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if (deref->mode != nir_var_shader_in)
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(var->data.location_frac == 0 ||
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continue;
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cursor_used_comps & ((1 << (var->data.location_frac)) - 1)))
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break;
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/* We can only pack varyings with matching interpolation types */
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/* We only remap things that aren't builtins. */
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if (interp_type[cursor[interp]] != interp)
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nir_variable *in_var = nir_deref_instr_get_variable(deref);
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continue;
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if (in_var->data.location < VARYING_SLOT_VAR0)
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continue;
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/* Interpolation loc must match also.
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unsigned location = in_var->data.location - VARYING_SLOT_VAR0;
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* TODO: i965 can handle these if they don't match, but the
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if (location >= MAX_VARYINGS_INCL_PATCH)
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* radeonsi nir backend handles everything as vec4s and so expects
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continue;
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* this to be the same for all components. We could make this
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* check driver specfific or drop it if NIR ever become the only
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* radeonsi backend.
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*/
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if (interp_loc[cursor[interp]] != get_interp_loc(var))
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continue;
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/* If the slot is empty just skip it for now, compact_var_list()
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unsigned var_info_idx =
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* can be called after this function to remove empty slots for us.
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store_varying_info_idx[location][in_var->data.location_frac];
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* TODO: finish implementing compact_var_list() requires array and
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if (!var_info_idx)
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* matrix splitting.
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continue;
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*/
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if (!cursor_used_comps)
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continue;
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uint8_t unused_comps = ~cursor_used_comps;
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struct varying_component *vc_info =
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&(*varying_comp_info)[var_info_idx-1];
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for (unsigned i = 0; i < 4; i++) {
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if (!vc_info->initialised) {
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uint8_t new_var_comps = 1 << i;
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const struct glsl_type *type = in_var->type;
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if (unused_comps & new_var_comps) {
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if (nir_is_per_vertex_io(in_var, consumer->info.stage)) {
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remap[location][var->data.location_frac].component = i;
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assert(glsl_type_is_array(type));
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remap[location][var->data.location_frac].location =
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type = glsl_get_array_element(type);
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cursor[interp] + VARYING_SLOT_VAR0;
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found_new_offset = true;
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/* Turn off the mask for the component we are remapping */
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if (comps[location] & 1 << var->data.location_frac) {
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comps[location] ^= 1 << var->data.location_frac;
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comps[cursor[interp]] |= new_var_comps;
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}
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break;
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}
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}
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}
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if (found_new_offset)
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vc_info->var = in_var;
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break;
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vc_info->interp_type =
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get_interp_type(in_var, type, default_to_smooth_interp);
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vc_info->interp_loc = get_interp_loc(in_var);
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vc_info->is_patch = in_var->data.patch;
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}
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}
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}
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}
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}
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}
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}
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static void
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assign_remap_locations(struct varying_loc (*remap)[4],
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struct assigned_comps *assigned_comps,
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struct varying_component *info,
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unsigned *cursor, unsigned *comp,
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unsigned max_location)
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{
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unsigned tmp_cursor = *cursor;
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unsigned tmp_comp = *comp;
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for (; tmp_cursor < max_location; tmp_cursor++) {
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if (assigned_comps[tmp_cursor].comps) {
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/* We can only pack varyings with matching interpolation types,
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* interpolation loc must match also.
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* TODO: i965 can handle interpolation locations that don't match,
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* but the radeonsi nir backend handles everything as vec4s and so
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* expects this to be the same for all components. We could make this
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* check driver specfific or drop it if NIR ever become the only
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* radeonsi backend.
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*/
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if (assigned_comps[tmp_cursor].interp_type != info->interp_type ||
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assigned_comps[tmp_cursor].interp_loc != info->interp_loc) {
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tmp_comp = 0;
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continue;
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}
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while (tmp_comp < 4 &&
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(assigned_comps[tmp_cursor].comps & (1 << tmp_comp))) {
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tmp_comp++;
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}
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}
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if (tmp_comp == 4) {
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tmp_comp = 0;
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continue;
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}
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unsigned location = info->var->data.location - VARYING_SLOT_VAR0;
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/* Once we have assigned a location mark it as used */
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assigned_comps[tmp_cursor].comps |= (1 << tmp_comp);
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assigned_comps[tmp_cursor].interp_type = info->interp_type;
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assigned_comps[tmp_cursor].interp_loc = info->interp_loc;
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/* Assign remap location */
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remap[location][info->var->data.location_frac].component = tmp_comp++;
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remap[location][info->var->data.location_frac].location =
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tmp_cursor + VARYING_SLOT_VAR0;
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break;
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}
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*cursor = tmp_cursor;
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*comp = tmp_comp;
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}
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/* If there are empty components in the slot compact the remaining components
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* as close to component 0 as possible. This will make it easier to fill the
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* empty components with components from a different slot in a following pass.
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*/
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static void
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compact_components(nir_shader *producer, nir_shader *consumer,
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struct assigned_comps *assigned_comps,
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bool default_to_smooth_interp)
|
||||||
|
{
|
||||||
|
struct exec_list *input_list = &consumer->inputs;
|
||||||
|
struct exec_list *output_list = &producer->outputs;
|
||||||
|
struct varying_loc remap[MAX_VARYINGS_INCL_PATCH][4] = {{{0}, {0}}};
|
||||||
|
struct varying_component *varying_comp_info;
|
||||||
|
unsigned varying_comp_info_size;
|
||||||
|
|
||||||
|
/* Gather varying component info */
|
||||||
|
gather_varying_component_info(consumer, &varying_comp_info,
|
||||||
|
&varying_comp_info_size,
|
||||||
|
default_to_smooth_interp);
|
||||||
|
|
||||||
|
/* Sort varying components. */
|
||||||
|
qsort(varying_comp_info, varying_comp_info_size,
|
||||||
|
sizeof(struct varying_component), cmp_varying_component);
|
||||||
|
|
||||||
|
unsigned cursor = 0;
|
||||||
|
unsigned comp = 0;
|
||||||
|
|
||||||
|
/* Set the remap array based on the sorted components */
|
||||||
|
for (unsigned i = 0; i < varying_comp_info_size; i++ ) {
|
||||||
|
struct varying_component *info = &varying_comp_info[i];
|
||||||
|
|
||||||
|
assert(info->is_patch || cursor < MAX_VARYING);
|
||||||
|
if (info->is_patch) {
|
||||||
|
/* The list should be sorted with all non-patch inputs first followed
|
||||||
|
* by patch inputs. When we hit our first patch input, we need to
|
||||||
|
* reset the cursor to MAX_VARYING so we put them in the right slot.
|
||||||
|
*/
|
||||||
|
if (cursor < MAX_VARYING) {
|
||||||
|
cursor = MAX_VARYING;
|
||||||
|
comp = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
assign_remap_locations(remap, assigned_comps, info,
|
||||||
|
&cursor, &comp, MAX_VARYINGS_INCL_PATCH);
|
||||||
|
} else {
|
||||||
|
assign_remap_locations(remap, assigned_comps, info,
|
||||||
|
&cursor, &comp, MAX_VARYING);
|
||||||
|
|
||||||
|
/* Check if we failed to assign a remap location. This can happen if
|
||||||
|
* for example there are a bunch of unmovable components with
|
||||||
|
* mismatching interpolation types causing us to skip over locations
|
||||||
|
* that would have been useful for packing later components.
|
||||||
|
* The solution is to iterate over the locations again (this should
|
||||||
|
* happen very rarely in practice).
|
||||||
|
*/
|
||||||
|
if (cursor == MAX_VARYING) {
|
||||||
|
cursor = 0;
|
||||||
|
comp = 0;
|
||||||
|
assign_remap_locations(remap, assigned_comps, info,
|
||||||
|
&cursor, &comp, MAX_VARYING);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
ralloc_free(varying_comp_info);
|
||||||
|
|
||||||
uint64_t zero = 0;
|
uint64_t zero = 0;
|
||||||
uint32_t zero32 = 0;
|
uint32_t zero32 = 0;
|
||||||
|
@ -539,20 +695,16 @@ nir_compact_varyings(nir_shader *producer, nir_shader *consumer,
|
||||||
assert(producer->info.stage != MESA_SHADER_FRAGMENT);
|
assert(producer->info.stage != MESA_SHADER_FRAGMENT);
|
||||||
assert(consumer->info.stage != MESA_SHADER_VERTEX);
|
assert(consumer->info.stage != MESA_SHADER_VERTEX);
|
||||||
|
|
||||||
uint8_t comps[32] = {0};
|
struct assigned_comps assigned_comps[MAX_VARYINGS_INCL_PATCH] = {0};
|
||||||
uint8_t interp_type[32] = {0};
|
|
||||||
uint8_t interp_loc[32] = {0};
|
|
||||||
|
|
||||||
get_slot_component_masks_and_interp_types(&producer->outputs, comps,
|
get_unmoveable_components_masks(&producer->outputs, assigned_comps,
|
||||||
interp_type, interp_loc,
|
producer->info.stage,
|
||||||
producer->info.stage,
|
default_to_smooth_interp);
|
||||||
default_to_smooth_interp);
|
get_unmoveable_components_masks(&consumer->inputs, assigned_comps,
|
||||||
get_slot_component_masks_and_interp_types(&consumer->inputs, comps,
|
consumer->info.stage,
|
||||||
interp_type, interp_loc,
|
default_to_smooth_interp);
|
||||||
consumer->info.stage,
|
|
||||||
default_to_smooth_interp);
|
|
||||||
|
|
||||||
compact_components(producer, consumer, comps, interp_type, interp_loc,
|
compact_components(producer, consumer, assigned_comps,
|
||||||
default_to_smooth_interp);
|
default_to_smooth_interp);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
Loading…
Reference in New Issue