/*
* This lowering pass converts references to input/output variables with
* loads/stores to actual input/output intrinsics.
- *
- * NOTE: This pass really only works for scalar backends at the moment due
- * to the way it packes the input/output data.
*/
#include "nir.h"
+#include "nir_builder.h"
struct lower_io_state {
+ nir_builder builder;
void *mem_ctx;
+ int (*type_size)(const struct glsl_type *type);
+ nir_variable_mode mode;
};
-static unsigned
-type_size(const struct glsl_type *type)
-{
- unsigned int size, i;
-
- switch (glsl_get_base_type(type)) {
- case GLSL_TYPE_UINT:
- case GLSL_TYPE_INT:
- case GLSL_TYPE_FLOAT:
- case GLSL_TYPE_BOOL:
- return glsl_get_components(type);
- case GLSL_TYPE_ARRAY:
- return type_size(glsl_get_array_element(type)) * glsl_get_length(type);
- case GLSL_TYPE_STRUCT:
- size = 0;
- for (i = 0; i < glsl_get_length(type); i++) {
- size += type_size(glsl_get_struct_field(type, i));
- }
- return size;
- case GLSL_TYPE_SAMPLER:
- return 0;
- case GLSL_TYPE_ATOMIC_UINT:
- return 0;
- case GLSL_TYPE_INTERFACE:
- return 0;
- case GLSL_TYPE_IMAGE:
- return 0;
- case GLSL_TYPE_VOID:
- case GLSL_TYPE_ERROR:
- unreachable("not reached");
- }
-
- return 0;
-}
-
-static void
-assign_var_locations(struct hash_table *ht, unsigned *size)
+void
+nir_assign_var_locations(struct exec_list *var_list, unsigned *size,
+ int (*type_size)(const struct glsl_type *))
{
unsigned location = 0;
- struct hash_entry *entry;
- hash_table_foreach(ht, entry) {
- nir_variable *var = (nir_variable *) entry->data;
-
+ nir_foreach_variable(var, var_list) {
/*
* UBO's have their own address spaces, so don't count them towards the
* number of global uniforms
*/
- if (var->data.mode == nir_var_uniform && var->interface_type != NULL)
+ if ((var->data.mode == nir_var_uniform || var->data.mode == nir_var_shader_storage) &&
+ var->interface_type != NULL)
continue;
var->data.driver_location = location;
*size = location;
}
-static void
-assign_var_locations_shader(nir_shader *shader)
+/**
+ * Returns true if we're processing a stage whose inputs are arrays indexed
+ * by a vertex number (such as geometry shader inputs).
+ */
+static bool
+is_per_vertex_input(struct lower_io_state *state, nir_variable *var)
{
- assign_var_locations(shader->inputs, &shader->num_inputs);
- assign_var_locations(shader->outputs, &shader->num_outputs);
- assign_var_locations(shader->uniforms, &shader->num_uniforms);
+ gl_shader_stage stage = state->builder.shader->stage;
+
+ return var->data.mode == nir_var_shader_in && !var->data.patch &&
+ (stage == MESA_SHADER_TESS_CTRL ||
+ stage == MESA_SHADER_TESS_EVAL ||
+ stage == MESA_SHADER_GEOMETRY);
}
static bool
-deref_has_indirect(nir_deref_var *deref)
+is_per_vertex_output(struct lower_io_state *state, nir_variable *var)
{
- for (nir_deref *tail = deref->deref.child; tail; tail = tail->child) {
- if (tail->deref_type == nir_deref_type_array) {
- nir_deref_array *arr = nir_deref_as_array(tail);
- if (arr->deref_array_type == nir_deref_array_type_indirect)
- return true;
- }
- }
-
- return false;
+ gl_shader_stage stage = state->builder.shader->stage;
+ return var->data.mode == nir_var_shader_out && !var->data.patch &&
+ stage == MESA_SHADER_TESS_CTRL;
}
-static unsigned
-get_io_offset(nir_deref_var *deref, nir_instr *instr, nir_src *indirect,
- struct lower_io_state *state)
+static nir_ssa_def *
+get_io_offset(nir_builder *b, nir_deref_var *deref,
+ nir_ssa_def **vertex_index,
+ int (*type_size)(const struct glsl_type *))
{
- bool found_indirect = false;
- unsigned base_offset = 0;
-
nir_deref *tail = &deref->deref;
+
+ /* For per-vertex input arrays (i.e. geometry shader inputs), keep the
+ * outermost array index separate. Process the rest normally.
+ */
+ if (vertex_index != NULL) {
+ tail = tail->child;
+ assert(tail->deref_type == nir_deref_type_array);
+ nir_deref_array *deref_array = nir_deref_as_array(tail);
+
+ nir_ssa_def *vtx = nir_imm_int(b, deref_array->base_offset);
+ if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
+ vtx = nir_iadd(b, vtx, nir_ssa_for_src(b, deref_array->indirect, 1));
+ }
+ *vertex_index = vtx;
+ }
+
+ /* Just emit code and let constant-folding go to town */
+ nir_ssa_def *offset = nir_imm_int(b, 0);
+
while (tail->child != NULL) {
const struct glsl_type *parent_type = tail->type;
tail = tail->child;
nir_deref_array *deref_array = nir_deref_as_array(tail);
unsigned size = type_size(tail->type);
- base_offset += size * deref_array->base_offset;
+ offset = nir_iadd(b, offset,
+ nir_imm_int(b, size * deref_array->base_offset));
if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
- nir_load_const_instr *load_const =
- nir_load_const_instr_create(state->mem_ctx, 1);
- load_const->value.u[0] = size;
- nir_instr_insert_before(instr, &load_const->instr);
-
- nir_alu_instr *mul = nir_alu_instr_create(state->mem_ctx,
- nir_op_imul);
- mul->src[0].src.is_ssa = true;
- mul->src[0].src.ssa = &load_const->def;
- nir_src_copy(&mul->src[1].src, &deref_array->indirect,
- state->mem_ctx);
- mul->dest.write_mask = 1;
- nir_ssa_dest_init(&mul->instr, &mul->dest.dest, 1, NULL);
- nir_instr_insert_before(instr, &mul->instr);
-
- if (found_indirect) {
- nir_alu_instr *add = nir_alu_instr_create(state->mem_ctx,
- nir_op_iadd);
- add->src[0].src = *indirect;
- add->src[1].src.is_ssa = true;
- add->src[1].src.ssa = &mul->dest.dest.ssa;
- add->dest.write_mask = 1;
- nir_ssa_dest_init(&add->instr, &add->dest.dest, 1, NULL);
- nir_instr_insert_before(instr, &add->instr);
-
- indirect->is_ssa = true;
- indirect->ssa = &add->dest.dest.ssa;
- } else {
- indirect->is_ssa = true;
- indirect->ssa = &mul->dest.dest.ssa;
- found_indirect = true;
- }
+ nir_ssa_def *mul =
+ nir_imul(b, nir_imm_int(b, size),
+ nir_ssa_for_src(b, deref_array->indirect, 1));
+
+ offset = nir_iadd(b, offset, mul);
}
} else if (tail->deref_type == nir_deref_type_struct) {
nir_deref_struct *deref_struct = nir_deref_as_struct(tail);
- for (unsigned i = 0; i < deref_struct->index; i++)
- base_offset += type_size(glsl_get_struct_field(parent_type, i));
+ unsigned field_offset = 0;
+ for (unsigned i = 0; i < deref_struct->index; i++) {
+ field_offset += type_size(glsl_get_struct_field(parent_type, i));
+ }
+ offset = nir_iadd(b, offset, nir_imm_int(b, field_offset));
}
}
- return base_offset;
+ return offset;
+}
+
+static nir_intrinsic_op
+load_op(struct lower_io_state *state,
+ nir_variable_mode mode, bool per_vertex)
+{
+ nir_intrinsic_op op;
+ switch (mode) {
+ case nir_var_shader_in:
+ op = per_vertex ? nir_intrinsic_load_per_vertex_input :
+ nir_intrinsic_load_input;
+ break;
+ case nir_var_shader_out:
+ op = per_vertex ? nir_intrinsic_load_per_vertex_output :
+ nir_intrinsic_load_output;
+ break;
+ case nir_var_uniform:
+ op = nir_intrinsic_load_uniform;
+ break;
+ default:
+ unreachable("Unknown variable mode");
+ }
+ return op;
}
static bool
{
struct lower_io_state *state = void_state;
+ nir_builder *b = &state->builder;
+
nir_foreach_instr_safe(block, instr) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
+ if (intrin->intrinsic != nir_intrinsic_load_var &&
+ intrin->intrinsic != nir_intrinsic_store_var)
+ continue;
+
+ nir_variable_mode mode = intrin->variables[0]->var->data.mode;
+
+ if (state->mode != nir_var_all && state->mode != mode)
+ continue;
+
+ if (mode != nir_var_shader_in &&
+ mode != nir_var_shader_out &&
+ mode != nir_var_uniform)
+ continue;
+
+ b->cursor = nir_before_instr(instr);
+
switch (intrin->intrinsic) {
case nir_intrinsic_load_var: {
- nir_variable_mode mode = intrin->variables[0]->var->data.mode;
- if (mode != nir_var_shader_in && mode != nir_var_uniform)
- continue;
-
- bool has_indirect = deref_has_indirect(intrin->variables[0]);
-
- /* Figure out the opcode */
- nir_intrinsic_op load_op;
- switch (mode) {
- case nir_var_shader_in:
- load_op = has_indirect ? nir_intrinsic_load_input_indirect :
- nir_intrinsic_load_input;
- break;
- case nir_var_uniform:
- load_op = has_indirect ? nir_intrinsic_load_uniform_indirect :
- nir_intrinsic_load_uniform;
- break;
- default:
- unreachable("Unknown variable mode");
- }
+ bool per_vertex =
+ is_per_vertex_input(state, intrin->variables[0]->var) ||
+ is_per_vertex_output(state, intrin->variables[0]->var);
- nir_intrinsic_instr *load = nir_intrinsic_instr_create(state->mem_ctx,
- load_op);
+ nir_ssa_def *offset;
+ nir_ssa_def *vertex_index;
+
+ offset = get_io_offset(b, intrin->variables[0],
+ per_vertex ? &vertex_index : NULL,
+ state->type_size);
+
+ nir_intrinsic_instr *load =
+ nir_intrinsic_instr_create(state->mem_ctx,
+ load_op(state, mode, per_vertex));
load->num_components = intrin->num_components;
- nir_src indirect;
- unsigned offset = get_io_offset(intrin->variables[0],
- &intrin->instr, &indirect, state);
- offset += intrin->variables[0]->var->data.driver_location;
+ load->const_index[0] =
+ intrin->variables[0]->var->data.driver_location;
- load->const_index[0] = offset;
- load->const_index[1] = 1;
+ if (per_vertex)
+ load->src[0] = nir_src_for_ssa(vertex_index);
- if (has_indirect)
- load->src[0] = indirect;
+ load->src[per_vertex ? 1 : 0] = nir_src_for_ssa(offset);
if (intrin->dest.is_ssa) {
nir_ssa_dest_init(&load->instr, &load->dest,
intrin->num_components, NULL);
nir_ssa_def_rewrite_uses(&intrin->dest.ssa,
- nir_src_for_ssa(&load->dest.ssa),
- state->mem_ctx);
+ nir_src_for_ssa(&load->dest.ssa));
} else {
nir_dest_copy(&load->dest, &intrin->dest, state->mem_ctx);
}
}
case nir_intrinsic_store_var: {
- if (intrin->variables[0]->var->data.mode != nir_var_shader_out)
- continue;
+ assert(mode == nir_var_shader_out);
- bool has_indirect = deref_has_indirect(intrin->variables[0]);
+ nir_ssa_def *offset;
+ nir_ssa_def *vertex_index;
- nir_intrinsic_op store_op;
- if (has_indirect) {
- store_op = nir_intrinsic_store_output_indirect;
- } else {
- store_op = nir_intrinsic_store_output;
- }
+ bool per_vertex =
+ is_per_vertex_output(state, intrin->variables[0]->var);
+
+ offset = get_io_offset(b, intrin->variables[0],
+ per_vertex ? &vertex_index : NULL,
+ state->type_size);
+
+ nir_intrinsic_op store_op =
+ per_vertex ? nir_intrinsic_store_per_vertex_output :
+ nir_intrinsic_store_output;
nir_intrinsic_instr *store = nir_intrinsic_instr_create(state->mem_ctx,
store_op);
store->num_components = intrin->num_components;
- nir_src indirect;
- unsigned offset = get_io_offset(intrin->variables[0],
- &intrin->instr, &indirect, state);
- offset += intrin->variables[0]->var->data.driver_location;
+ nir_src_copy(&store->src[0], &intrin->src[0], store);
- store->const_index[0] = offset;
- store->const_index[1] = 1;
+ store->const_index[0] =
+ intrin->variables[0]->var->data.driver_location;
- nir_src_copy(&store->src[0], &intrin->src[0], state->mem_ctx);
+ if (per_vertex)
+ store->src[1] = nir_src_for_ssa(vertex_index);
- if (has_indirect)
- store->src[1] = indirect;
+ store->src[per_vertex ? 2 : 1] = nir_src_for_ssa(offset);
nir_instr_insert_before(&intrin->instr, &store->instr);
nir_instr_remove(&intrin->instr);
}
static void
-nir_lower_io_impl(nir_function_impl *impl)
+nir_lower_io_impl(nir_function_impl *impl,
+ nir_variable_mode mode,
+ int (*type_size)(const struct glsl_type *))
{
struct lower_io_state state;
+ nir_builder_init(&state.builder, impl);
state.mem_ctx = ralloc_parent(impl);
+ state.mode = mode;
+ state.type_size = type_size;
nir_foreach_block(impl, nir_lower_io_block, &state);
}
void
-nir_lower_io(nir_shader *shader)
+nir_lower_io(nir_shader *shader, nir_variable_mode mode,
+ int (*type_size)(const struct glsl_type *))
{
- assign_var_locations_shader(shader);
-
nir_foreach_overload(shader, overload) {
if (overload->impl)
- nir_lower_io_impl(overload->impl);
+ nir_lower_io_impl(overload->impl, mode, type_size);
+ }
+}
+
+/**
+ * Return the offset soruce for a load/store intrinsic.
+ */
+nir_src *
+nir_get_io_offset_src(nir_intrinsic_instr *instr)
+{
+ switch (instr->intrinsic) {
+ case nir_intrinsic_load_input:
+ case nir_intrinsic_load_output:
+ case nir_intrinsic_load_uniform:
+ return &instr->src[0];
+ case nir_intrinsic_load_ubo:
+ case nir_intrinsic_load_ssbo:
+ case nir_intrinsic_load_per_vertex_input:
+ case nir_intrinsic_load_per_vertex_output:
+ case nir_intrinsic_store_output:
+ return &instr->src[1];
+ case nir_intrinsic_store_ssbo:
+ case nir_intrinsic_store_per_vertex_output:
+ return &instr->src[2];
+ default:
+ return NULL;
+ }
+}
+
+/**
+ * Return the vertex index source for a load/store per_vertex intrinsic.
+ */
+nir_src *
+nir_get_io_vertex_index_src(nir_intrinsic_instr *instr)
+{
+ switch (instr->intrinsic) {
+ case nir_intrinsic_load_per_vertex_input:
+ case nir_intrinsic_load_per_vertex_output:
+ return &instr->src[0];
+ case nir_intrinsic_store_per_vertex_output:
+ return &instr->src[1];
+ default:
+ return NULL;
}
}
projects / mesa.git / blobdiff