243 lines
9.0 KiB
Common Lisp
243 lines
9.0 KiB
Common Lisp
/* OpenCL lowres subpel Refine */
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/* Each thread performs 8x8 SAD. 4 threads per MB, so the 4 DIA HPEL offsets are
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* calculated simultaneously */
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int sad_8x8_ii_hpel( read_only image2d_t fenc, int2 fencpos, read_only image2d_t fref_planes, int2 qpos )
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{
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int2 frefpos = qpos >> 2;
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int hpel_idx = ((qpos.x & 2) >> 1) + (qpos.y & 2);
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uint mask_shift = 8 * hpel_idx;
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uint4 cost4 = 0;
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for( int y = 0; y < 8; y++ )
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{
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uint4 enc, val4;
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enc = read_imageui( fenc, sampler, fencpos + (int2)(0, y));
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val4.s0 = (read_imageui( fref_planes, sampler, frefpos + (int2)(0, y)).s0 >> mask_shift) & 0xFF;
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val4.s1 = (read_imageui( fref_planes, sampler, frefpos + (int2)(1, y)).s0 >> mask_shift) & 0xFF;
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val4.s2 = (read_imageui( fref_planes, sampler, frefpos + (int2)(2, y)).s0 >> mask_shift) & 0xFF;
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val4.s3 = (read_imageui( fref_planes, sampler, frefpos + (int2)(3, y)).s0 >> mask_shift) & 0xFF;
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cost4 += abs_diff( enc, val4 );
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enc = read_imageui( fenc, sampler, fencpos + (int2)(4, y));
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val4.s0 = (read_imageui( fref_planes, sampler, frefpos + (int2)(4, y)).s0 >> mask_shift) & 0xFF;
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val4.s1 = (read_imageui( fref_planes, sampler, frefpos + (int2)(5, y)).s0 >> mask_shift) & 0xFF;
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val4.s2 = (read_imageui( fref_planes, sampler, frefpos + (int2)(6, y)).s0 >> mask_shift) & 0xFF;
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val4.s3 = (read_imageui( fref_planes, sampler, frefpos + (int2)(7, y)).s0 >> mask_shift) & 0xFF;
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cost4 += abs_diff( enc, val4 );
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}
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return cost4.s0 + cost4.s1 + cost4.s2 + cost4.s3;
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}
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/* One thread measures 8x8 SAD cost at a QPEL offset into an HPEL plane */
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int sad_8x8_ii_qpel( read_only image2d_t fenc, int2 fencpos, read_only image2d_t fref_planes, int2 qpos )
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{
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int2 frefApos = qpos >> 2;
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int hpelA = ((qpos.x & 2) >> 1) + (qpos.y & 2);
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int2 qposB = qpos + ((qpos & 1) << 1);
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int2 frefBpos = qposB >> 2;
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int hpelB = ((qposB.x & 2) >> 1) + (qposB.y & 2);
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uint mask_shift0 = 8 * hpelA, mask_shift1 = 8 * hpelB;
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int cost = 0;
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for( int y = 0; y < 8; y++ )
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{
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for( int x = 0; x < 8; x++ )
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{
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uint enc = read_imageui( fenc, sampler, fencpos + (int2)(x, y)).s0;
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uint vA = (read_imageui( fref_planes, sampler, frefApos + (int2)(x, y)).s0 >> mask_shift0) & 0xFF;
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uint vB = (read_imageui( fref_planes, sampler, frefBpos + (int2)(x, y)).s0 >> mask_shift1) & 0xFF;
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cost += abs_diff( enc, rhadd( vA, vB ) );
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}
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}
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return cost;
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}
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/* Four threads measure 8x8 SATD cost at a QPEL offset into an HPEL plane
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*
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* Each thread collects 1/4 of the rows of diffs and processes one quarter of
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* the transforms
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*/
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int satd_8x8_ii_qpel_coop4( read_only image2d_t fenc,
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int2 fencpos,
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read_only image2d_t fref_planes,
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int2 qpos,
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local sum2_t *tmpp,
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int idx )
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{
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volatile local sum2_t( *tmp )[4] = (volatile local sum2_t( * )[4])tmpp;
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sum2_t b0, b1, b2, b3;
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// fencpos is full-pel position of original MB
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// qpos is qpel position within reference frame
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int2 frefApos = qpos >> 2;
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int hpelA = ((qpos.x&2)>>1) + (qpos.y&2);
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int2 qposB = qpos + (int2)(((qpos.x&1)<<1), ((qpos.y&1)<<1));
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int2 frefBpos = qposB >> 2;
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int hpelB = ((qposB.x&2)>>1) + (qposB.y&2);
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uint mask_shift0 = 8 * hpelA, mask_shift1 = 8 * hpelB;
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uint vA, vB;
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uint a0, a1;
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uint enc;
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sum2_t sum = 0;
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#define READ_DIFF( OUT, X )\
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enc = read_imageui( fenc, sampler, fencpos + (int2)(X, idx) ).s0;\
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vA = (read_imageui( fref_planes, sampler, frefApos + (int2)(X, idx) ).s0 >> mask_shift0) & 0xFF;\
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vB = (read_imageui( fref_planes, sampler, frefBpos + (int2)(X, idx) ).s0 >> mask_shift1) & 0xFF;\
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OUT = enc - rhadd( vA, vB );
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#define READ_DIFF_EX( OUT, a, b )\
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{\
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READ_DIFF( a0, a );\
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READ_DIFF( a1, b );\
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OUT = a0 + (a1<<BITS_PER_SUM);\
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}
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#define ROW_8x4_SATD( a, b )\
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{\
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fencpos.y += a;\
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frefApos.y += b;\
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frefBpos.y += b;\
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READ_DIFF_EX( b0, 0, 4 );\
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READ_DIFF_EX( b1, 1, 5 );\
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READ_DIFF_EX( b2, 2, 6 );\
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READ_DIFF_EX( b3, 3, 7 );\
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HADAMARD4( tmp[idx][0], tmp[idx][1], tmp[idx][2], tmp[idx][3], b0, b1, b2, b3 );\
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HADAMARD4( b0, b1, b2, b3, tmp[0][idx], tmp[1][idx], tmp[2][idx], tmp[3][idx] );\
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sum += abs2( b0 ) + abs2( b1 ) + abs2( b2 ) + abs2( b3 );\
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}
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ROW_8x4_SATD( 0, 0 );
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ROW_8x4_SATD( 4, 4 );
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#undef READ_DIFF
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#undef READ_DIFF_EX
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#undef ROW_8x4_SATD
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return (((sum_t)sum) + (sum>>BITS_PER_SUM)) >> 1;
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}
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constant int2 hpoffs[4] =
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{
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{0, -2}, {-2, 0}, {2, 0}, {0, 2}
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};
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/* sub pixel refinement of motion vectors, output MVs and costs are moved from
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* temporary buffers into final per-frame buffer
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*
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* global launch dimensions: [mb_width * 4, mb_height]
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*
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* With X being the source 16x16 pixels, F is the lowres pixel used by the
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* motion search. We will now utilize the H V and C pixels (stored in separate
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* planes) to search at half-pel increments.
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*
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* X X X X X X
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* F H F H F
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* X X X X X X
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* V C V C V
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* X X X X X X
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* F H F H F
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* X X X X X X
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*
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* The YX HPEL bits of the motion vector selects the plane we search in. The
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* four planes are packed in the fref_planes 2D image buffer. Each sample
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* returns: s0 = F, s1 = H, s2 = V, s3 = C */
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kernel void subpel_refine( read_only image2d_t fenc,
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read_only image2d_t fref_planes,
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const global short2 *in_mvs,
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const global int16_t *in_sad_mv_costs,
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local int16_t *cost_local,
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local sum2_t *satd_local,
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local short2 *mvc_local,
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global short2 *fenc_lowres_mv,
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global int16_t *fenc_lowres_mv_costs,
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int mb_width,
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int lambda,
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int b,
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int ref,
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int b_islist1 )
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{
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int mb_x = get_global_id( 0 ) >> 2;
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if( mb_x >= mb_width )
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return;
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int mb_height = get_global_size( 1 );
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int mb_i = get_global_id( 0 ) & 3;
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int mb_y = get_global_id( 1 );
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int mb_xy = mb_y * mb_width + mb_x;
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/* fenc_lowres_mv and fenc_lowres_mv_costs are large buffers that
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* hold many frames worth of motion vectors. We must offset into the correct
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* location for this frame's vectors. The kernel will be passed the correct
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* directional buffer for the direction of the search: list1 or list0
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*
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* CPU equivalent: fenc->lowres_mvs[0][b - p0 - 1]
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* GPU equivalent: fenc_lowres_mvs[(b - p0 - 1) * mb_count] */
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fenc_lowres_mv += (b_islist1 ? (ref-b-1) : (b-ref-1)) * mb_width * mb_height;
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fenc_lowres_mv_costs += (b_islist1 ? (ref-b-1) : (b-ref-1)) * mb_width * mb_height;
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/* Adjust pointers into local memory buffers for this thread's data */
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int mb_in_group = get_local_id( 1 ) * (get_local_size( 0 ) >> 2) + (get_local_id( 0 ) >> 2);
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cost_local += mb_in_group * 4;
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satd_local += mb_in_group * 16;
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mvc_local += mb_in_group * 4;
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int i_mvc = 0;
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mvc_local[0] = mvc_local[1] = mvc_local[2] = mvc_local[3] = 0;
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#define MVC( DX, DY ) mvc_local[i_mvc++] = in_mvs[mb_width * (mb_y + DY) + (mb_x + DX)];
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if( mb_x > 0 )
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MVC( -1, 0 );
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if( mb_y > 0 )
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{
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MVC( 0, -1 );
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if( mb_x < mb_width - 1 )
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MVC( 1, -1 );
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if( mb_x > 0 )
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MVC( -1, -1 );
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}
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#undef MVC
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int2 mvp = (i_mvc <= 1) ? convert_int2_sat(mvc_local[0]) : x264_median_mv( mvc_local[0], mvc_local[1], mvc_local[2] );
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int bcost = in_sad_mv_costs[mb_xy];
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int2 coord = (int2)(mb_x, mb_y) << 3;
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int2 bmv = convert_int2_sat( in_mvs[mb_xy] );
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/* Make mvp and bmv QPEL MV */
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mvp <<= 2; bmv <<= 2;
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#define HPEL_QPEL( ARR, FUNC )\
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{\
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int2 trymv = bmv + ARR[mb_i];\
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int2 qpos = (coord << 2) + trymv;\
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int cost = FUNC( fenc, coord, fref_planes, qpos ) + lambda * mv_cost( abs_diff( trymv, mvp ) );\
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cost_local[mb_i] = (cost<<2) + mb_i;\
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cost = min( cost_local[0], min( cost_local[1], min( cost_local[2], cost_local[3] ) ) );\
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if( (cost>>2) < bcost )\
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{\
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bmv += ARR[cost&3];\
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bcost = cost>>2;\
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}\
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}
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HPEL_QPEL( hpoffs, sad_8x8_ii_hpel );
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HPEL_QPEL( dia_offs, sad_8x8_ii_qpel );
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fenc_lowres_mv[mb_xy] = convert_short2_sat( bmv );
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/* remeasure cost of bmv using SATD */
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int2 qpos = (coord << 2) + bmv;
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cost_local[mb_i] = satd_8x8_ii_qpel_coop4( fenc, coord, fref_planes, qpos, satd_local, mb_i );
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bcost = cost_local[0] + cost_local[1] + cost_local[2] + cost_local[3];
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bcost += lambda * mv_cost( abs_diff( bmv, mvp ) );
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fenc_lowres_mv_costs[mb_xy] = min( bcost, LOWRES_COST_MASK );
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}
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