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gallium: implement TGSI_OPCODE_EXP

This commit is contained in:
Brian 2008-05-01 18:49:20 -06:00
parent 7a4313b63b
commit 3b63bc8ac6
1 changed files with 15 additions and 14 deletions
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29
src/gallium/auxiliary/tgsi/exec/tgsi_exec.c
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@ -1530,22 +1530,23 @@ exec_instruction(
break;
case TGSI_OPCODE_EXP:
debug_printf("TGSI: EXP opcode not implemented\n");
/* from ARB_v_p:
tmp = ScalarLoad(op0);
result.x = 2^floor(tmp);
result.y = tmp - floor(tmp);
result.z = RoughApprox2ToX(tmp);
result.w = 1.0;
*/
#if 0
/* something like this: */
FETCH( &r[0], 0, CHAN_X );
micro_exp2( &r[0], &r[0] );
FOR_EACH_ENABLED_CHANNEL( *inst, chan_index ) {
STORE( &r[0], 0, chan_index );
micro_flr( &r[1], &r[0] ); /* r1 = floor(r0) */
if (IS_CHANNEL_ENABLED( *inst, CHAN_X )) {
micro_exp2( &r[2], &r[1] ); /* r2 = 2 ^ r1 */
STORE( &r[2], 0, CHAN_X ); /* store r2 */
}
if (IS_CHANNEL_ENABLED( *inst, CHAN_Y )) {
micro_sub( &r[2], &r[0], &r[1] ); /* r2 = r0 - r1 */
STORE( &r[2], 0, CHAN_Y ); /* store r2 */
}
if (IS_CHANNEL_ENABLED( *inst, CHAN_Z )) {
micro_exp2( &r[2], &r[0] ); /* r2 = 2 ^ r0 */
STORE( &r[2], 0, CHAN_Z ); /* store r2 */
}
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_LOG: