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vc4: Add support for the COS instruction.

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This commit is contained in:
Eric Anholt 2014-08-06 17:25:31 -07:00
parent 663ffff0e7
commit 7b4b60b7e5
1 changed files with 38 additions and 0 deletions
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38
src/gallium/drivers/vc4/vc4_program.c
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@ -403,6 +403,43 @@ tgsi_to_qir_sin(struct tgsi_to_qir *trans,
return sum;
}
/* Note that this instruction replicates its result from the x channel */
static struct qreg
tgsi_to_qir_cos(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[] = {
1.0f,
-pow(2.0 * M_PI, 2) / (2 * 1),
pow(2.0 * M_PI, 4) / (4 * 3 * 2 * 1),
-pow(2.0 * M_PI, 6) / (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_frac = tgsi_to_qir_frc(trans, NULL, 0, &scaled_x, 0);
struct qreg sum = qir_uniform_f(trans, coeff[0]);
struct qreg x2 = qir_FMUL(c, x_frac, x_frac);
struct qreg x = x2; /* Current x^2, x^4, or x^6 */
for (int i = 1; i < ARRAY_SIZE(coeff); i++) {
if (i != 1)
x = qir_FMUL(c, x, x2);
struct qreg mul = qir_FMUL(c,
x,
qir_uniform_f(trans, coeff[i]));
if (i == 0)
sum = mul;
else
sum = qir_FADD(c, sum, mul);
}
return sum;
}
static void
emit_vertex_input(struct tgsi_to_qir *trans, int attr)
{
@ -532,6 +569,7 @@ emit_tgsi_instruction(struct tgsi_to_qir *trans,
[TGSI_OPCODE_TRUNC] = { 0, tgsi_to_qir_trunc },
[TGSI_OPCODE_FRC] = { 0, tgsi_to_qir_frc },
[TGSI_OPCODE_SIN] = { 0, tgsi_to_qir_sin },
[TGSI_OPCODE_COS] = { 0, tgsi_to_qir_cos },
};
static int asdf = 0;
uint32_t tgsi_op = tgsi_inst->Instruction.Opcode;