Commit 663ffff0 authored by Eric Anholt's avatar Eric Anholt

vc4: Add support for the SIN instruction.

v2: Rebase on helpers.
parent d815b249
......@@ -369,6 +369,40 @@ tgsi_to_qir_abs(struct tgsi_to_qir *trans,
return qir_FMAXABS(c, arg, arg);
}
/* Note that this instruction replicates its result from the x channel */
static struct qreg
tgsi_to_qir_sin(struct tgsi_to_qir *trans,
struct tgsi_full_instruction *tgsi_inst,
enum qop op, struct qreg *src, int i)
{
struct qcompile *c = trans->c;
float coeff[] = {
2.0 * M_PI,
-pow(2.0 * M_PI, 3) / (3 * 2 * 1),
pow(2.0 * M_PI, 5) / (5 * 4 * 3 * 2 * 1),
-pow(2.0 * M_PI, 7) / (7 * 6 * 5 * 4 * 3 * 2 * 1),
};
struct qreg scaled_x =
qir_FMUL(c,
src[0 * 4 + 0],
qir_uniform_f(trans, 1.0f / (M_PI * 2.0f)));
struct qreg x = tgsi_to_qir_frc(trans, NULL, 0, &scaled_x, 0);
struct qreg x2 = qir_FMUL(c, x, x);
struct qreg sum = qir_FMUL(c, x, qir_uniform_f(trans, coeff[0]));
for (int i = 1; i < ARRAY_SIZE(coeff); i++) {
x = qir_FMUL(c, x, x2);
sum = qir_FADD(c,
sum,
qir_FMUL(c,
x,
qir_uniform_f(trans, coeff[i])));
}
return sum;
}
static void
emit_vertex_input(struct tgsi_to_qir *trans, int attr)
{
......@@ -497,6 +531,7 @@ emit_tgsi_instruction(struct tgsi_to_qir *trans,
[TGSI_OPCODE_POW] = { 0, tgsi_to_qir_pow },
[TGSI_OPCODE_TRUNC] = { 0, tgsi_to_qir_trunc },
[TGSI_OPCODE_FRC] = { 0, tgsi_to_qir_frc },
[TGSI_OPCODE_SIN] = { 0, tgsi_to_qir_sin },
};
static int asdf = 0;
uint32_t tgsi_op = tgsi_inst->Instruction.Opcode;
......
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