/** Helper used by lp_build_cube_lookup() */
static LLVMValueRef
lp_build_cube_ima(struct lp_build_context *coord_bld, LLVMValueRef coord)
{
/* ima = -0.5 / abs(coord); */
LLVMValueRef negHalf = lp_build_const_vec(coord_bld->gallivm, coord_bld->type, -0.5);
LLVMValueRef absCoord = lp_build_abs(coord_bld, coord);
LLVMValueRef ima = lp_build_div(coord_bld, negHalf, absCoord);
return ima;
}
/**
* Generate code to do cube face selection and compute per-face texcoords.
*/
void
lp_build_cube_lookup(struct lp_build_sample_context *bld,
LLVMValueRef s,
LLVMValueRef t,
LLVMValueRef r,
LLVMValueRef *face,
LLVMValueRef *face_s,
LLVMValueRef *face_t)
{
struct lp_build_context *float_bld = &bld->float_bld;
struct lp_build_context *coord_bld = &bld->coord_bld;
LLVMBuilderRef builder = bld->gallivm->builder;
LLVMValueRef rx, ry, rz;
LLVMValueRef arx, ary, arz;
LLVMValueRef c25 = lp_build_const_float(bld->gallivm, 0.25);
LLVMValueRef arx_ge_ary, arx_ge_arz;
LLVMValueRef ary_ge_arx, ary_ge_arz;
LLVMValueRef arx_ge_ary_arz, ary_ge_arx_arz;
assert(bld->coord_bld.type.length == 4);
/*
* Use the average of the four pixel's texcoords to choose the face.
*/
rx = lp_build_mul(float_bld, c25,
lp_build_sum_vector(&bld->coord_bld, s));
ry = lp_build_mul(float_bld, c25,
lp_build_sum_vector(&bld->coord_bld, t));
rz = lp_build_mul(float_bld, c25,
lp_build_sum_vector(&bld->coord_bld, r));
arx = lp_build_abs(float_bld, rx);
ary = lp_build_abs(float_bld, ry);
arz = lp_build_abs(float_bld, rz);
/*
* Compare sign/magnitude of rx,ry,rz to determine face
*/
arx_ge_ary = LLVMBuildFCmp(builder, LLVMRealUGE, arx, ary, "");
arx_ge_arz = LLVMBuildFCmp(builder, LLVMRealUGE, arx, arz, "");
ary_ge_arx = LLVMBuildFCmp(builder, LLVMRealUGE, ary, arx, "");
ary_ge_arz = LLVMBuildFCmp(builder, LLVMRealUGE, ary, arz, "");
arx_ge_ary_arz = LLVMBuildAnd(builder, arx_ge_ary, arx_ge_arz, "");
ary_ge_arx_arz = LLVMBuildAnd(builder, ary_ge_arx, ary_ge_arz, "");
{
struct lp_build_if_state if_ctx;
LLVMValueRef face_s_var;
LLVMValueRef face_t_var;
LLVMValueRef face_var;
face_s_var = lp_build_alloca(bld->gallivm, bld->coord_bld.vec_type, "face_s_var");
face_t_var = lp_build_alloca(bld->gallivm, bld->coord_bld.vec_type, "face_t_var");
face_var = lp_build_alloca(bld->gallivm, bld->int_bld.vec_type, "face_var");
lp_build_if(&if_ctx, bld->gallivm, arx_ge_ary_arz);
{
/* +/- X face */
LLVMValueRef sign = lp_build_sgn(float_bld, rx);
LLVMValueRef ima = lp_build_cube_ima(coord_bld, s);
*face_s = lp_build_cube_coord(coord_bld, sign, +1, r, ima);
*face_t = lp_build_cube_coord(coord_bld, NULL, +1, t, ima);
*face = lp_build_cube_face(bld, rx,
PIPE_TEX_FACE_POS_X,
PIPE_TEX_FACE_NEG_X);
LLVMBuildStore(builder, *face_s, face_s_var);
LLVMBuildStore(builder, *face_t, face_t_var);
LLVMBuildStore(builder, *face, face_var);
}
lp_build_else(&if_ctx);
{
struct lp_build_if_state if_ctx2;
lp_build_if(&if_ctx2, bld->gallivm, ary_ge_arx_arz);
{
/* +/- Y face */
LLVMValueRef sign = lp_build_sgn(float_bld, ry);
LLVMValueRef ima = lp_build_cube_ima(coord_bld, t);
*face_s = lp_build_cube_coord(coord_bld, NULL, -1, s, ima);
*face_t = lp_build_cube_coord(coord_bld, sign, -1, r, ima);
*face = lp_build_cube_face(bld, ry,
PIPE_TEX_FACE_POS_Y,
PIPE_TEX_FACE_NEG_Y);
LLVMBuildStore(builder, *face_s, face_s_var);
LLVMBuildStore(builder, *face_t, face_t_var);
LLVMBuildStore(builder, *face, face_var);
}
lp_build_else(&if_ctx2);
{
/* +/- Z face */
LLVMValueRef sign = lp_build_sgn(float_bld, rz);
LLVMValueRef ima = lp_build_cube_ima(coord_bld, r);
*face_s = lp_build_cube_coord(coord_bld, sign, -1, s, ima);
*face_t = lp_build_cube_coord(coord_bld, NULL, +1, t, ima);
*face = lp_build_cube_face(bld, rz,
PIPE_TEX_FACE_POS_Z,
PIPE_TEX_FACE_NEG_Z);
LLVMBuildStore(builder, *face_s, face_s_var);
LLVMBuildStore(builder, *face_t, face_t_var);
LLVMBuildStore(builder, *face, face_var);
}
lp_build_endif(&if_ctx2);
}
lp_build_endif(&if_ctx);
*face_s = LLVMBuildLoad(builder, face_s_var, "face_s");
*face_t = LLVMBuildLoad(builder, face_t_var, "face_t");
*face = LLVMBuildLoad(builder, face_var, "face");
}
}
/**
* Emit LLVM for one TGSI instruction.
* \param return TRUE for success, FALSE otherwise
*/
static boolean
emit_instruction(
struct lp_build_tgsi_aos_context *bld,
const struct tgsi_full_instruction *inst,
const struct tgsi_opcode_info *info,
int *pc)
{
LLVMValueRef src0, src1, src2;
LLVMValueRef tmp0, tmp1;
LLVMValueRef dst0;
/*
* Stores and write masks are handled in a general fashion after the long
* instruction opcode switch statement.
*
* Although not stricitly necessary, we avoid generating instructions for
* channels which won't be stored, in cases where's that easy. For some
* complex instructions, like texture sampling, it is more convenient to
* assume a full writemask and then let LLVM optimization passes eliminate
* redundant code.
*/
(*pc)++;
assert(info->num_dst <= 1);
if (info->num_dst) {
dst0 = bld->base.undef;
}
switch (inst->Instruction.Opcode) {
case TGSI_OPCODE_ARL:
src0 = emit_fetch(bld, inst, 0);
dst0 = lp_build_floor(&bld->base, src0);
break;
case TGSI_OPCODE_MOV:
dst0 = emit_fetch(bld, inst, 0);
break;
case TGSI_OPCODE_LIT:
return FALSE;
case TGSI_OPCODE_RCP:
/* TGSI_OPCODE_RECIP */
src0 = emit_fetch(bld, inst, 0);
dst0 = lp_build_rcp(&bld->base, src0);
break;
case TGSI_OPCODE_RSQ:
/* TGSI_OPCODE_RECIPSQRT */
src0 = emit_fetch(bld, inst, 0);
tmp0 = lp_build_abs(&bld->base, src0);
dst0 = lp_build_rsqrt(&bld->base, tmp0);
break;
case TGSI_OPCODE_EXP:
return FALSE;
case TGSI_OPCODE_LOG:
return FALSE;
case TGSI_OPCODE_MUL:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
dst0 = lp_build_mul(&bld->base, src0, src1);
break;
case TGSI_OPCODE_ADD:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
dst0 = lp_build_add(&bld->base, src0, src1);
break;
case TGSI_OPCODE_DP3:
/* TGSI_OPCODE_DOT3 */
return FALSE;
case TGSI_OPCODE_DP4:
/* TGSI_OPCODE_DOT4 */
return FALSE;
case TGSI_OPCODE_DST:
return FALSE;
case TGSI_OPCODE_MIN:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
dst0 = lp_build_max(&bld->base, src0, src1);
break;
case TGSI_OPCODE_MAX:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
dst0 = lp_build_max(&bld->base, src0, src1);
break;
case TGSI_OPCODE_SLT:
/* TGSI_OPCODE_SETLT */
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
tmp0 = lp_build_cmp(&bld->base, PIPE_FUNC_LESS, src0, src1);
dst0 = lp_build_select(&bld->base, tmp0, bld->base.one, bld->base.zero);
break;
case TGSI_OPCODE_SGE:
/* TGSI_OPCODE_SETGE */
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
tmp0 = lp_build_cmp(&bld->base, PIPE_FUNC_GEQUAL, src0, src1);
dst0 = lp_build_select(&bld->base, tmp0, bld->base.one, bld->base.zero);
break;
case TGSI_OPCODE_MAD:
/* TGSI_OPCODE_MADD */
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
src2 = emit_fetch(bld, inst, 2);
tmp0 = lp_build_mul(&bld->base, src0, src1);
dst0 = lp_build_add(&bld->base, tmp0, src2);
break;
case TGSI_OPCODE_SUB:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
dst0 = lp_build_sub(&bld->base, src0, src1);
break;
case TGSI_OPCODE_LRP:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
src2 = emit_fetch(bld, inst, 2);
tmp0 = lp_build_sub(&bld->base, src1, src2);
tmp0 = lp_build_mul(&bld->base, src0, tmp0);
dst0 = lp_build_add(&bld->base, tmp0, src2);
break;
case TGSI_OPCODE_CND:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
src2 = emit_fetch(bld, inst, 2);
tmp1 = lp_build_const_vec(bld->base.type, 0.5);
tmp0 = lp_build_cmp(&bld->base, PIPE_FUNC_GREATER, src2, tmp1);
dst0 = lp_build_select(&bld->base, tmp0, src0, src1);
break;
case TGSI_OPCODE_DP2A:
return FALSE;
case TGSI_OPCODE_FRC:
src0 = emit_fetch(bld, inst, 0);
tmp0 = lp_build_floor(&bld->base, src0);
dst0 = lp_build_sub(&bld->base, src0, tmp0);
break;
case TGSI_OPCODE_CLAMP:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
src2 = emit_fetch(bld, inst, 2);
tmp0 = lp_build_max(&bld->base, src0, src1);
dst0 = lp_build_min(&bld->base, tmp0, src2);
break;
case TGSI_OPCODE_FLR:
src0 = emit_fetch(bld, inst, 0);
dst0 = lp_build_floor(&bld->base, src0);
break;
case TGSI_OPCODE_ROUND:
src0 = emit_fetch(bld, inst, 0);
dst0 = lp_build_round(&bld->base, src0);
break;
case TGSI_OPCODE_EX2:
src0 = emit_fetch(bld, inst, 0);
tmp0 = lp_build_swizzle_scalar_aos(&bld->base, src0, TGSI_SWIZZLE_X);
dst0 = lp_build_exp2(&bld->base, tmp0);
break;
case TGSI_OPCODE_LG2:
src0 = emit_fetch(bld, inst, 0);
tmp0 = swizzle_scalar_aos(bld, src0, TGSI_SWIZZLE_X);
dst0 = lp_build_log2(&bld->base, tmp0);
break;
case TGSI_OPCODE_POW:
src0 = emit_fetch(bld, inst, 0);
src0 = swizzle_scalar_aos(bld, src0, TGSI_SWIZZLE_X);
src1 = emit_fetch(bld, inst, 1);
src1 = swizzle_scalar_aos(bld, src1, TGSI_SWIZZLE_X);
dst0 = lp_build_pow(&bld->base, src0, src1);
break;
case TGSI_OPCODE_XPD:
return FALSE;
case TGSI_OPCODE_ABS:
src0 = emit_fetch(bld, inst, 0);
dst0 = lp_build_abs(&bld->base, src0);
break;
case TGSI_OPCODE_RCC:
/* deprecated? */
assert(0);
return FALSE;
case TGSI_OPCODE_DPH:
return FALSE;
case TGSI_OPCODE_COS:
src0 = emit_fetch(bld, inst, 0);
tmp0 = swizzle_scalar_aos(bld, src0, TGSI_SWIZZLE_X);
dst0 = lp_build_cos(&bld->base, tmp0);
break;
case TGSI_OPCODE_DDX:
return FALSE;
case TGSI_OPCODE_DDY:
return FALSE;
case TGSI_OPCODE_KILP:
/* predicated kill */
return FALSE;
case TGSI_OPCODE_KIL:
/* conditional kill */
return FALSE;
case TGSI_OPCODE_PK2H:
return FALSE;
break;
case TGSI_OPCODE_PK2US:
return FALSE;
break;
case TGSI_OPCODE_PK4B:
return FALSE;
break;
case TGSI_OPCODE_PK4UB:
return FALSE;
case TGSI_OPCODE_RFL:
return FALSE;
case TGSI_OPCODE_SEQ:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
tmp0 = lp_build_cmp(&bld->base, PIPE_FUNC_EQUAL, src0, src1);
dst0 = lp_build_select(&bld->base, tmp0, bld->base.one, bld->base.zero);
break;
case TGSI_OPCODE_SFL:
dst0 = bld->base.zero;
break;
case TGSI_OPCODE_SGT:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
tmp0 = lp_build_cmp(&bld->base, PIPE_FUNC_GREATER, src0, src1);
dst0 = lp_build_select(&bld->base, tmp0, bld->base.one, bld->base.zero);
break;
case TGSI_OPCODE_SIN:
src0 = emit_fetch(bld, inst, 0);
tmp0 = swizzle_scalar_aos(bld, src0, TGSI_SWIZZLE_X);
dst0 = lp_build_sin(&bld->base, tmp0);
break;
case TGSI_OPCODE_SLE:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
tmp0 = lp_build_cmp(&bld->base, PIPE_FUNC_LEQUAL, src0, src1);
dst0 = lp_build_select(&bld->base, tmp0, bld->base.one, bld->base.zero);
break;
case TGSI_OPCODE_SNE:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
tmp0 = lp_build_cmp(&bld->base, PIPE_FUNC_NOTEQUAL, src0, src1);
dst0 = lp_build_select(&bld->base, tmp0, bld->base.one, bld->base.zero);
break;
case TGSI_OPCODE_STR:
dst0 = bld->base.one;
break;
case TGSI_OPCODE_TEX:
dst0 = emit_tex(bld, inst, LP_BLD_TEX_MODIFIER_NONE);
break;
case TGSI_OPCODE_TXD:
dst0 = emit_tex(bld, inst, LP_BLD_TEX_MODIFIER_EXPLICIT_DERIV);
break;
case TGSI_OPCODE_UP2H:
/* deprecated */
assert (0);
return FALSE;
break;
case TGSI_OPCODE_UP2US:
/* deprecated */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_UP4B:
/* deprecated */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_UP4UB:
/* deprecated */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_X2D:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_ARA:
/* deprecated */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_ARR:
src0 = emit_fetch(bld, inst, 0);
dst0 = lp_build_round(&bld->base, src0);
break;
case TGSI_OPCODE_BRA:
/* deprecated */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_CAL:
return FALSE;
case TGSI_OPCODE_RET:
return FALSE;
case TGSI_OPCODE_END:
*pc = -1;
break;
case TGSI_OPCODE_SSG:
/* TGSI_OPCODE_SGN */
tmp0 = emit_fetch(bld, inst, 0);
dst0 = lp_build_sgn(&bld->base, tmp0);
break;
case TGSI_OPCODE_CMP:
src0 = emit_fetch(bld, inst, 0);
src1 = emit_fetch(bld, inst, 1);
src2 = emit_fetch(bld, inst, 2);
tmp0 = lp_build_cmp(&bld->base, PIPE_FUNC_LESS, src0, bld->base.zero);
dst0 = lp_build_select(&bld->base, tmp0, src1, src2);
break;
case TGSI_OPCODE_SCS:
return FALSE;
case TGSI_OPCODE_TXB:
dst0 = emit_tex(bld, inst, LP_BLD_TEX_MODIFIER_LOD_BIAS);
break;
case TGSI_OPCODE_NRM:
/* fall-through */
case TGSI_OPCODE_NRM4:
return FALSE;
case TGSI_OPCODE_DIV:
/* deprecated */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_DP2:
return FALSE;
case TGSI_OPCODE_TXL:
dst0 = emit_tex(bld, inst, LP_BLD_TEX_MODIFIER_EXPLICIT_LOD);
break;
case TGSI_OPCODE_TXP:
dst0 = emit_tex(bld, inst, LP_BLD_TEX_MODIFIER_PROJECTED);
break;
case TGSI_OPCODE_BRK:
return FALSE;
case TGSI_OPCODE_IF:
return FALSE;
case TGSI_OPCODE_BGNLOOP:
return FALSE;
case TGSI_OPCODE_BGNSUB:
return FALSE;
case TGSI_OPCODE_ELSE:
return FALSE;
case TGSI_OPCODE_ENDIF:
return FALSE;
case TGSI_OPCODE_ENDLOOP:
return FALSE;
case TGSI_OPCODE_ENDSUB:
return FALSE;
case TGSI_OPCODE_PUSHA:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_POPA:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_CEIL:
src0 = emit_fetch(bld, inst, 0);
dst0 = lp_build_ceil(&bld->base, src0);
break;
case TGSI_OPCODE_I2F:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_NOT:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_TRUNC:
src0 = emit_fetch(bld, inst, 0);
dst0 = lp_build_trunc(&bld->base, src0);
break;
case TGSI_OPCODE_SHL:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_ISHR:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_AND:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_OR:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_MOD:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_XOR:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_SAD:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_TXF:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_TXQ:
/* deprecated? */
assert(0);
return FALSE;
break;
case TGSI_OPCODE_CONT:
return FALSE;
case TGSI_OPCODE_EMIT:
return FALSE;
break;
case TGSI_OPCODE_ENDPRIM:
return FALSE;
break;
case TGSI_OPCODE_NOP:
break;
default:
return FALSE;
}
if (info->num_dst) {
emit_store(bld, inst, 0, dst0);
}
return TRUE;
}
/**
* Generate code to compute coordinate gradient (rho).
* \param ddx partial derivatives of (s, t, r, q) with respect to X
* \param ddy partial derivatives of (s, t, r, q) with respect to Y
*
* XXX: The resulting rho is scalar, so we ignore all but the first element of
* derivatives that are passed by the shader.
*/
static LLVMValueRef
lp_build_rho(struct lp_build_sample_context *bld,
unsigned unit,
const LLVMValueRef ddx[4],
const LLVMValueRef ddy[4])
{
struct lp_build_context *int_size_bld = &bld->int_size_bld;
struct lp_build_context *float_size_bld = &bld->float_size_bld;
struct lp_build_context *float_bld = &bld->float_bld;
const unsigned dims = bld->dims;
LLVMBuilderRef builder = bld->gallivm->builder;
LLVMTypeRef i32t = LLVMInt32TypeInContext(bld->gallivm->context);
LLVMValueRef index0 = LLVMConstInt(i32t, 0, 0);
LLVMValueRef index1 = LLVMConstInt(i32t, 1, 0);
LLVMValueRef index2 = LLVMConstInt(i32t, 2, 0);
LLVMValueRef dsdx, dsdy, dtdx, dtdy, drdx, drdy;
LLVMValueRef rho_x, rho_y;
LLVMValueRef rho_vec;
LLVMValueRef int_size, float_size;
LLVMValueRef rho;
LLVMValueRef first_level, first_level_vec;
dsdx = ddx[0];
dsdy = ddy[0];
if (dims <= 1) {
rho_x = dsdx;
rho_y = dsdy;
}
else {
rho_x = float_size_bld->undef;
rho_y = float_size_bld->undef;
rho_x = LLVMBuildInsertElement(builder, rho_x, dsdx, index0, "");
rho_y = LLVMBuildInsertElement(builder, rho_y, dsdy, index0, "");
dtdx = ddx[1];
dtdy = ddy[1];
rho_x = LLVMBuildInsertElement(builder, rho_x, dtdx, index1, "");
rho_y = LLVMBuildInsertElement(builder, rho_y, dtdy, index1, "");
if (dims >= 3) {
drdx = ddx[2];
drdy = ddy[2];
rho_x = LLVMBuildInsertElement(builder, rho_x, drdx, index2, "");
rho_y = LLVMBuildInsertElement(builder, rho_y, drdy, index2, "");
}
}
rho_x = lp_build_abs(float_size_bld, rho_x);
rho_y = lp_build_abs(float_size_bld, rho_y);
rho_vec = lp_build_max(float_size_bld, rho_x, rho_y);
first_level = bld->dynamic_state->first_level(bld->dynamic_state,
bld->gallivm, unit);
first_level_vec = lp_build_broadcast_scalar(&bld->int_size_bld, first_level);
int_size = lp_build_minify(int_size_bld, bld->int_size, first_level_vec);
float_size = lp_build_int_to_float(float_size_bld, int_size);
rho_vec = lp_build_mul(float_size_bld, rho_vec, float_size);
if (dims <= 1) {
rho = rho_vec;
}
else {
if (dims >= 2) {
LLVMValueRef rho_s, rho_t, rho_r;
rho_s = LLVMBuildExtractElement(builder, rho_vec, index0, "");
rho_t = LLVMBuildExtractElement(builder, rho_vec, index1, "");
rho = lp_build_max(float_bld, rho_s, rho_t);
if (dims >= 3) {
rho_r = LLVMBuildExtractElement(builder, rho_vec, index2, "");
rho = lp_build_max(float_bld, rho, rho_r);
}
}
}
return rho;
}
/**
* Register fetch.
*/
static LLVMValueRef
emit_fetch(
struct lp_build_tgsi_aos_context *bld,
const struct tgsi_full_instruction *inst,
unsigned src_op)
{
struct lp_type type = bld->base.type;
const struct tgsi_full_src_register *reg = &inst->Src[src_op];
LLVMValueRef res;
unsigned chan;
assert(!reg->Register.Indirect);
/*
* Fetch the from the register file.
*/
switch (reg->Register.File) {
case TGSI_FILE_CONSTANT:
/*
* Get the constants components
*/
res = bld->base.undef;
for (chan = 0; chan < 4; ++chan) {
LLVMValueRef index;
LLVMValueRef scalar_ptr;
LLVMValueRef scalar;
LLVMValueRef swizzle;
index = LLVMConstInt(LLVMInt32Type(),
reg->Register.Index*4 + chan,
0);
scalar_ptr = LLVMBuildGEP(bld->base.builder, bld->consts_ptr,
&index, 1, "");
scalar = LLVMBuildLoad(bld->base.builder, scalar_ptr, "");
lp_build_name(scalar, "const[%u].%c", reg->Register.Index, "xyzw"[chan]);
/*
* NOTE: constants array is always assumed to be RGBA
*/
swizzle = LLVMConstInt(LLVMInt32Type(), chan, 0);
res = LLVMBuildInsertElement(bld->base.builder, res, scalar, swizzle, "");
}
/*
* Broadcast the first quaternion to all others.
*
* XXX: could be factored into a reusable function.
*/
if (type.length > 4) {
LLVMValueRef shuffles[LP_MAX_VECTOR_LENGTH];
unsigned i;
for (chan = 0; chan < 4; ++chan) {
shuffles[chan] = LLVMConstInt(LLVMInt32Type(), chan, 0);
}
for (i = 4; i < type.length; ++i) {
shuffles[i] = shuffles[i % 4];
}
res = LLVMBuildShuffleVector(bld->base.builder,
res, bld->base.undef,
LLVMConstVector(shuffles, type.length),
"");
}
break;
case TGSI_FILE_IMMEDIATE:
res = bld->immediates[reg->Register.Index];
assert(res);
break;
case TGSI_FILE_INPUT:
res = bld->inputs[reg->Register.Index];
assert(res);
break;
case TGSI_FILE_TEMPORARY:
{
LLVMValueRef temp_ptr;
temp_ptr = bld->temps[reg->Register.Index];
res = LLVMBuildLoad(bld->base.builder, temp_ptr, "");
if (!res)
return bld->base.undef;
}
break;
default:
assert(0 && "invalid src register in emit_fetch()");
return bld->base.undef;
}
/*
* Apply sign modifier.
*/
if (reg->Register.Absolute) {
res = lp_build_abs(&bld->base, res);
}
if(reg->Register.Negate) {
res = lp_build_negate(&bld->base, res);
}
/*
* Swizzle the argument
*/
res = swizzle_aos(bld, res,
reg->Register.SwizzleX,
reg->Register.SwizzleY,
reg->Register.SwizzleZ,
reg->Register.SwizzleW);
return res;
}