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gallium: implement TGSI_OPCODE_LOG

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This commit is contained in:
Brian 2008-05-01 18:42:01 -06:00
parent bc49529874
commit 7a4313b63b
1 changed files with 16 additions and 14 deletions
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30
src/gallium/auxiliary/tgsi/exec/tgsi_exec.c
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@ -1549,22 +1549,24 @@ exec_instruction(
break;
case TGSI_OPCODE_LOG:
debug_printf("TGSI: LOG opcode not implemented\n");
/* from ARB_v_p:
tmp = fabs(ScalarLoad(op0));
result.x = floor(log2(tmp));
result.y = tmp / 2^(floor(log2(tmp)));
result.z = RoughApproxLog2(tmp);
result.w = 1.0;
*/
#if 0
/* something like this: */
FETCH( &r[0], 0, CHAN_X );
micro_lg2( &r[0], &r[0] );
FOR_EACH_ENABLED_CHANNEL( *inst, chan_index ) {
STORE( &r[0], 0, chan_index );
micro_abs( &r[2], &r[0] ); /* r2 = abs(r0) */
micro_lg2( &r[1], &r[2] ); /* r1 = lg2(r2) */
micro_flr( &r[0], &r[1] ); /* r0 = floor(r1) */
if (IS_CHANNEL_ENABLED( *inst, CHAN_X )) {
STORE( &r[0], 0, CHAN_X );
}
if (IS_CHANNEL_ENABLED( *inst, CHAN_Y )) {
micro_exp2( &r[0], &r[0] ); /* r0 = 2 ^ r0 */
micro_div( &r[0], &r[2], &r[0] ); /* r0 = r2 / r0 */
STORE( &r[0], 0, CHAN_Y );
}
if (IS_CHANNEL_ENABLED( *inst, CHAN_Z )) {
STORE( &r[1], 0, CHAN_Z );
}
if (IS_CHANNEL_ENABLED( *inst, CHAN_W )) {
STORE( &mach->Temps[TEMP_1_I].xyzw[TEMP_1_C], 0, CHAN_W );
}
#endif
break;
case TGSI_OPCODE_MUL: