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nir: Add preamble functions

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These are functions that run before the entrypoint at least once per
draw and write their results via store_preamble, and then are loaded in
the rest of the shader via load_preamble.

We will add users in the following commits.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13148>
This commit is contained in:
Connor Abbott
2021-09-24 18:12:24 +02:00
committed by Marge Bot
parent dfb6438392
commit d1b017d479
7 changed files with 51 additions and 8 deletions
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src/compiler/nir/nir_serialize.c
+18 -5
View File
@@ -1955,6 +1955,10 @@ static void
write_function_impl(write_ctx *ctx, const nir_function_impl *fi)
{
blob_write_uint8(ctx->blob, fi->structured);
blob_write_uint8(ctx->blob, !!fi->preamble);
if (fi->preamble)
blob_write_uint32(ctx->blob, write_lookup_object(ctx, fi->preamble));
write_var_list(ctx, &fi->locals);
write_reg_list(ctx, &fi->registers);
@@ -1971,6 +1975,10 @@ read_function_impl(read_ctx *ctx, nir_function *fxn)
fi->function = fxn;
fi->structured = blob_read_uint8(ctx->blob);
bool preamble = blob_read_uint8(ctx->blob);
if (preamble)
fi->preamble = read_object(ctx);
read_var_list(ctx, &fi->locals);
read_reg_list(ctx, &fi->registers);
@@ -1987,11 +1995,15 @@ read_function_impl(read_ctx *ctx, nir_function *fxn)
static void
write_function(write_ctx *ctx, const nir_function *fxn)
{
uint32_t flags = fxn->is_entrypoint;
if (fxn->name)
uint32_t flags = 0;
if (fxn->is_entrypoint)
flags |= 0x1;
if (fxn->is_preamble)
flags |= 0x2;
if (fxn->impl)
if (fxn->name)
flags |= 0x4;
if (fxn->impl)
flags |= 0x8;
blob_write_uint32(ctx->blob, flags);
if (fxn->name)
blob_write_string(ctx->blob, fxn->name);
@@ -2017,7 +2029,7 @@ static void
read_function(read_ctx *ctx)
{
uint32_t flags = blob_read_uint32(ctx->blob);
bool has_name = flags & 0x2;
bool has_name = flags & 0x4;
char *name = has_name ? blob_read_string(ctx->blob) : NULL;
nir_function *fxn = nir_function_create(ctx->nir, name);
@@ -2033,7 +2045,8 @@ read_function(read_ctx *ctx)
}
fxn->is_entrypoint = flags & 0x1;
if (flags & 0x4)
fxn->is_preamble = flags & 0x2;
if (flags & 0x8)
fxn->impl = NIR_SERIALIZE_FUNC_HAS_IMPL;
}