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i965/fs: Add support for non-shadow textureGrad (TXD) on gen5/6.

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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 16:06:49 -07:00
parent 3fa910fff9
commit 2f4a4b943f
1 changed files with 31 additions and 1 deletions
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32
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
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@ -742,7 +742,37 @@ fs_visitor::emit_texture_gen5(ir_texture *ir, fs_reg dst, fs_reg coordinate,
inst = emit(FS_OPCODE_TXL, dst);
break;
case ir_txd:
case ir_txd: {
ir->lod_info.grad.dPdx->accept(this);
fs_reg dPdx = this->result;
ir->lod_info.grad.dPdy->accept(this);
fs_reg dPdy = this->result;
mlen = MAX2(mlen, header_present + 4 * reg_width); /* skip over 'ai' */
/**
* P = u, v, r
* dPdx = dudx, dvdx, drdx
* dPdy = dudy, dvdy, drdy
*
* Load up these values:
* - dudx dudy dvdx dvdy drdx drdy
* - dPdx.x dPdy.x dPdx.y dPdy.y dPdx.z dPdy.z
*/
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 += reg_width;
emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdy);
dPdy.reg_offset++;
mlen += reg_width;
}
inst = emit(FS_OPCODE_TXD, dst);
break;
}
case ir_txf:
assert(!"GLSL 1.30 features unsupported");
break;