diff options
| -rw-r--r-- | src/gallium/auxiliary/tgsi/tgsi_exec.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.c b/src/gallium/auxiliary/tgsi/tgsi_exec.c index 8fe46f780ab..34b72850208 100644 --- a/src/gallium/auxiliary/tgsi/tgsi_exec.c +++ b/src/gallium/auxiliary/tgsi/tgsi_exec.c @@ -5234,6 +5234,45 @@ exec_interp_at_offset(struct tgsi_exec_machine *mach, store_dest(mach, &result, &inst->Dst[0], inst, chan, TGSI_EXEC_DATA_FLOAT); } } + + +static void +exec_interp_at_centroid(struct tgsi_exec_machine *mach, + const struct tgsi_full_instruction *inst) +{ + union tgsi_exec_channel index; + union tgsi_exec_channel index2D; + union tgsi_exec_channel result[TGSI_NUM_CHANNELS]; + const struct tgsi_full_src_register *reg = &inst->Src[0]; + + assert(reg->Register.File == TGSI_FILE_INPUT); + get_index_registers(mach, reg, &index, &index2D); + + for (unsigned chan = 0; chan < TGSI_NUM_CHANNELS; chan++) { + if (!(inst->Dst[0].Register.WriteMask & (1 << chan))) + continue; + + /* Here we should add the change to use a sample that lies within the + * primitive (Section 15.2): + * + * "When interpolating variables declared using centroid in , + * the variable is sampled at a location within the pixel covered + * by the primitive generating the fragment. + * ... + * The built-in functions interpolateAtCentroid ... will sample + * variables as though they were declared with the centroid ... + * qualifier[s]." + * + * Since we only support 1 sample currently, this is just a pass-through. + */ + fetch_src_file_channel(mach, TGSI_FILE_INPUT, chan, &index, &index2D, + &result[chan]); + store_dest(mach, &result[chan], &inst->Dst[0], inst, chan, TGSI_EXEC_DATA_FLOAT); + } + +} + + /** * Execute a TGSI instruction. * Returns TRUE if a barrier instruction is hit, @@ -6284,6 +6323,9 @@ exec_instruction( case TGSI_OPCODE_INTERP_OFFSET: exec_interp_at_offset(mach, inst); break; + case TGSI_OPCODE_INTERP_CENTROID: + exec_interp_at_centroid(mach, inst); + break; default: assert( 0 ); } |