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i965/blorp: Simplify the sample layout calculation

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Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand 2016-05-04 17:32:29 -07:00
parent bee160b31b
commit 5a68df87da
1 changed files with 7 additions and 17 deletions
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24
src/mesa/drivers/dri/i965/brw_blorp_blit.cpp
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@ -1506,6 +1506,9 @@ brw_blorp_blit_program::manual_blend_bilinear(unsigned num_samples)
* --------- ---------
* | 6 | 7 | | 7 | 1 |
* --------- ---------
*
* Fortunately, this can be done fairly easily as:
* S' = (0x17306425 >> (S * 4)) & 0xf
*/
emit_frc(vec16(t1_f), x_sample_coords);
emit_frc(vec16(t2_f), y_sample_coords);
@ -1515,23 +1518,10 @@ brw_blorp_blit_program::manual_blend_bilinear(unsigned num_samples)
emit_mov(vec16(S), t1_f);
if (num_samples == 8) {
/* Map the sample index to a sample number */
emit_cmp_if(BRW_CONDITIONAL_L, S, brw_imm_d(4));
{
emit_mov(vec16(t2), brw_imm_d(5));
emit_if_eq_mov(S, 1, vec16(t2), 2);
emit_if_eq_mov(S, 2, vec16(t2), 4);
emit_if_eq_mov(S, 3, vec16(t2), 6);
}
emit_else();
{
emit_mov(vec16(t2), brw_imm_d(0));
emit_if_eq_mov(S, 5, vec16(t2), 3);
emit_if_eq_mov(S, 6, vec16(t2), 7);
emit_if_eq_mov(S, 7, vec16(t2), 1);
}
emit_endif();
emit_mov(vec16(S), t2);
emit_mov(vec16(t2), brw_imm_d(0x17306425));
emit_shl(vec16(S), S, brw_imm_d(2));
emit_shr(vec16(S), t2, S);
emit_and(vec16(S), S, brw_imm_d(0xf));
}
texel_fetch(texture_data[i]);
}