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-rw-r--r--src/gallium/auxiliary/tgsi/exec/tgsi_exec.c30
1 files changed, 16 insertions, 14 deletions
diff --git a/src/gallium/auxiliary/tgsi/exec/tgsi_exec.c b/src/gallium/auxiliary/tgsi/exec/tgsi_exec.c
index d55f907c0d..4b33d7e8bd 100644
--- a/src/gallium/auxiliary/tgsi/exec/tgsi_exec.c
+++ b/src/gallium/auxiliary/tgsi/exec/tgsi_exec.c
@@ -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: