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vc4: Add support for the TGSI FRC opcode. 

v2: Rebase on helpers.
This commit is contained in:
Eric Anholt 2014-08-05 13:35:19 -07:00
parent bf542cd372
commit f069367f39
1 changed files with 18 additions and 0 deletions
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18
src/gallium/drivers/vc4/vc4_program.c
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@ -301,6 +301,23 @@ tgsi_to_qir_trunc(struct tgsi_to_qir *trans,
return qir_ITOF(c, qir_FTOI(c, src[0 * 4 + i]));
}
/**
* Computes x - floor(x), which is tricky because our FTOI truncates (rounds
* to zero).
*/
static struct qreg
tgsi_to_qir_frc(struct tgsi_to_qir *trans,
struct tgsi_full_instruction *tgsi_inst,
enum qop op, struct qreg *src, int i)
{
struct qcompile *c = trans->c;
struct qreg trunc = qir_ITOF(c, qir_FTOI(c, src[0 * 4 + i]));
struct qreg diff = qir_FSUB(c, src[0 * 4 + i], trunc);
return qir_CMP(c,
diff,
qir_FADD(c, diff, qir_uniform_f(trans, 1.0)),
diff);
}
static struct qreg
tgsi_to_qir_dp(struct tgsi_to_qir *trans,
@ -424,6 +441,7 @@ emit_tgsi_instruction(struct tgsi_to_qir *trans,
[TGSI_OPCODE_LRP] = { 0, tgsi_to_qir_lrp },
[TGSI_OPCODE_POW] = { 0, tgsi_to_qir_pow },
[TGSI_OPCODE_TRUNC] = { 0, tgsi_to_qir_trunc },
[TGSI_OPCODE_FRC] = { 0, tgsi_to_qir_frc },
};
static int asdf = 0;
uint32_t tgsi_op = tgsi_inst->Instruction.Opcode;