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pan/midgard: Lower gl_VertexID/gl_InstanceID to attributes

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We have special records for these, put in a fixed location by convention
per the blob.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig 2019-12-19 13:31:21 -05:00
parent 6e68890fd6
commit 306800d747
2 changed files with 35 additions and 0 deletions
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26
src/panfrost/midgard/midgard_compile.c
View file

@ -1400,6 +1400,27 @@ emit_compute_builtin(compiler_context *ctx, nir_intrinsic_instr *instr)
ins.load_store.arg_1 = compute_builtin_arg(instr->intrinsic); ins.load_store.arg_1 = compute_builtin_arg(instr->intrinsic);
emit_mir_instruction(ctx, ins); emit_mir_instruction(ctx, ins);
} }
static unsigned
vertex_builtin_arg(nir_op op)
{
switch (op) {
case nir_intrinsic_load_vertex_id:
return PAN_VERTEX_ID;
case nir_intrinsic_load_instance_id:
return PAN_INSTANCE_ID;
default:
unreachable("Invalid vertex builtin");
}
}
static void
emit_vertex_builtin(compiler_context *ctx, nir_intrinsic_instr *instr)
{
unsigned reg = nir_dest_index(ctx, &instr->dest);
emit_attr_read(ctx, reg, vertex_builtin_arg(instr->intrinsic), 1, nir_type_int);
}
static void static void
emit_intrinsic(compiler_context *ctx, nir_intrinsic_instr *instr) emit_intrinsic(compiler_context *ctx, nir_intrinsic_instr *instr)
{ {
@ -1632,6 +1653,11 @@ emit_intrinsic(compiler_context *ctx, nir_intrinsic_instr *instr)
emit_compute_builtin(ctx, instr); emit_compute_builtin(ctx, instr);
break; break;
case nir_intrinsic_load_vertex_id:
case nir_intrinsic_load_instance_id:
emit_vertex_builtin(ctx, instr);
break;
default: default:
printf ("Unhandled intrinsic\n"); printf ("Unhandled intrinsic\n");
assert(0); assert(0);

9
src/panfrost/midgard/midgard_compile.h
View file

@ -57,6 +57,15 @@ enum {
#define PAN_SYSVAL_ID_TO_TXS_DIM(id) (((id) >> 7) & 0x3) #define PAN_SYSVAL_ID_TO_TXS_DIM(id) (((id) >> 7) & 0x3)
#define PAN_SYSVAL_ID_TO_TXS_IS_ARRAY(id) !!((id) & (1 << 9)) #define PAN_SYSVAL_ID_TO_TXS_IS_ARRAY(id) !!((id) & (1 << 9))
/* Special attribute slots for vertex builtings. Sort of arbitrary but let's be
* consistent with the blob so we can compare traces easier. */
enum {
PAN_VERTEX_ID = 16,
PAN_INSTANCE_ID = 17,
PAN_MAX_ATTRIBUTE
} pan_special_attributes;
typedef struct { typedef struct {
int work_register_count; int work_register_count;
int uniform_count; int uniform_count;