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zink: factor out builtin-var creation 

This is useful so we can reuse it for the next patch

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Erik Faye-Lund 2020-01-03 12:20:02 +01:00
parent ce1ea6e9c2
commit 1b2731f268
1 changed files with 23 additions and 15 deletions
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38
src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c
View File

@ -1245,25 +1245,33 @@ emit_store_deref(struct ntv_context *ctx, nir_intrinsic_instr *intr)
spirv_builder_emit_store(&ctx->builder, ptr, result);
}
static SpvId
create_builtin_var(struct ntv_context *ctx, SpvId var_type,
SpvStorageClass storage_class,
const char *name, SpvBuiltIn builtin)
{
SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
storage_class,
var_type);
SpvId var = spirv_builder_emit_var(&ctx->builder, pointer_type,
storage_class);
spirv_builder_emit_name(&ctx->builder, var, name);
spirv_builder_emit_builtin(&ctx->builder, var, builtin);
assert(ctx->num_entry_ifaces < ARRAY_SIZE(ctx->entry_ifaces));
ctx->entry_ifaces[ctx->num_entry_ifaces++] = var;
return var;
}
static void
emit_load_front_face(struct ntv_context *ctx, nir_intrinsic_instr *intr)
{
SpvId var_type = spirv_builder_type_bool(&ctx->builder);
if (!ctx->front_face_var) {
SpvId pointer_type = spirv_builder_type_pointer(&ctx->builder,
SpvStorageClassInput,
var_type);
ctx->front_face_var = spirv_builder_emit_var(&ctx->builder,
pointer_type,
SpvStorageClassInput);
spirv_builder_emit_name(&ctx->builder, ctx->front_face_var,
"gl_FrontFacing");
spirv_builder_emit_builtin(&ctx->builder, ctx->front_face_var,
SpvBuiltInFrontFacing);
assert(ctx->num_entry_ifaces < ARRAY_SIZE(ctx->entry_ifaces));
ctx->entry_ifaces[ctx->num_entry_ifaces++] = ctx->front_face_var;
}
if (!ctx->front_face_var)
ctx->front_face_var = create_builtin_var(ctx, var_type,
SpvStorageClassInput,
"gl_FrontFacing",
SpvBuiltInFrontFacing);
SpvId result = spirv_builder_emit_load(&ctx->builder, var_type,
ctx->front_face_var);