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i965/fs: Add support for non-shadow textureGrad (TXD) on gen4.

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Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke 2011-06-08 16:05:34 -07:00
parent 2f4a4b943f
commit 6c947cfd19
2 changed files with 39 additions and 2 deletions
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4
src/mesa/drivers/dri/i965/brw_fs_emit.cpp
View file

@ -312,7 +312,9 @@ fs_visitor::generate_tex(fs_inst *inst, struct brw_reg dst, struct brw_reg src)
}
break;
case FS_OPCODE_TXD:
assert(!"TXD isn't supported on gen4 yet.");
assert(!inst->shadow_compare); // not supported yet
assert(inst->mlen == 7 || inst->mlen == 10);
msg_type = BRW_SAMPLER_MESSAGE_SIMD8_SAMPLE_GRADIENTS;
break;
}
}

37
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
View file

@ -595,7 +595,42 @@ fs_visitor::emit_texture_gen4(ir_texture *ir, fs_reg dst, fs_reg coordinate,
/* gen4's SIMD8 sampler always has the slots for u,v,r present. */
mlen += 3;
} else if (ir->op == ir_txd) {
assert(!"TXD isn't supported on gen4 yet.");
ir->lod_info.grad.dPdx->accept(this);
fs_reg dPdx = this->result;
ir->lod_info.grad.dPdy->accept(this);
fs_reg dPdy = this->result;
for (int i = 0; i < ir->coordinate->type->vector_elements; i++) {
emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen + i), coordinate);
coordinate.reg_offset++;
}
/* the slots for u and v are always present, but r is optional */
mlen += MAX2(ir->coordinate->type->vector_elements, 2);
/* P = u, v, r
* dPdx = dudx, dvdx, drdx
* dPdy = dudy, dvdy, drdy
*
* 2-arg: dudx dvdx dudy dvdy
* dPdx.x dPdx.y dPdy.x dPdy.y
* m4 m5 m6 m7
*
* 3-arg: dudx dvdx drdx dudy dvdy drdy
* dPdx.x dPdx.y dPdx.z dPdy.x dPdy.y dPdy.z
* m5 m6 m7 m8 m9 m10
*/
for (int i = 0; i < ir->lod_info.grad.dPdx->type->vector_elements; i++) {
emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdx);
dPdx.reg_offset++;
mlen++;
}
for (int i = 0; i < ir->lod_info.grad.dPdy->type->vector_elements; i++) {
emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdy);
dPdy.reg_offset++;
mlen++;
}
} else {
/* Oh joy. gen4 doesn't have SIMD8 non-shadow-compare bias/lod
* instructions. We'll need to do SIMD16 here.