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nir/lower_input_attachments: Support loading layer id via gl_ViewIndex

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This is required on adreno when the special multiview mode is switched
on.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5719>
This commit is contained in:
Connor Abbott
2020-07-01 17:29:45 +02:00
committed by Marge Bot
parent 76f711d09d
commit c1a6e34573
2 changed files with 11 additions and 5 deletions
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1
src/compiler/nir/nir.h
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@@ -4461,6 +4461,7 @@ bool nir_lower_idiv(nir_shader *shader, enum nir_lower_idiv_path path);
typedef struct nir_input_attachment_options {
bool use_fragcoord_sysval;
bool use_layer_id_sysval;
bool use_view_id_for_layer;
} nir_input_attachment_options;
bool nir_lower_input_attachments(nir_shader *shader,

15
src/compiler/nir/nir_lower_input_attachments.c
View File

@@ -53,17 +53,22 @@ load_frag_coord(const nir_input_attachment_options *options, nir_builder *b)
static nir_ssa_def *
load_layer_id(const nir_input_attachment_options *options, nir_builder *b)
{
if (options->use_layer_id_sysval)
return nir_load_layer_id(b);
if (options->use_layer_id_sysval) {
if (options->use_view_id_for_layer)
return nir_load_view_index(b);
else
return nir_load_layer_id(b);
}
gl_varying_slot slot = options->use_view_id_for_layer ?
VARYING_SLOT_VIEW_INDEX : VARYING_SLOT_LAYER;
nir_variable *layer_id =
nir_find_variable_with_location(b->shader, nir_var_shader_in,
VARYING_SLOT_LAYER);
nir_find_variable_with_location(b->shader, nir_var_shader_in, slot);
if (layer_id == NULL) {
layer_id = nir_variable_create(b->shader, nir_var_shader_in,
glsl_int_type(), NULL);
layer_id->data.location = VARYING_SLOT_LAYER;
layer_id->data.location = slot;
layer_id->data.interpolation = INTERP_MODE_FLAT;
layer_id->data.driver_location = b->shader->num_inputs++;
}