layout(r8ui) uniform restrict readonly uimage2D cum2sym_tex;
layout(rg16ui) uniform restrict readonly uimage2D dsyms_tex;
layout(r8) uniform restrict writeonly image2D out_tex;
-layout(r16i) uniform restrict writeonly iimage2D coeff_tex;
+layout(r32i) uniform restrict writeonly iimage2D coeff_tex;
+layout(r32i) uniform restrict writeonly iimage2D coeff2_tex;
uniform int num_blocks;
const uint prob_bits = 12;
const uint prob_scale = 1 << prob_bits;
const uint NUM_SYMS = 256;
const uint ESCAPE_LIMIT = NUM_SYMS - 1;
+const uint BLOCKS_PER_STREAM = 320;
// These need to be folded into quant_matrix.
const float dc_scalefac = 8.0;
};
uniform uint sign_bias_per_model[16];
-const uint RANS_BYTE_L = (1u << 23); // lower bound of our normalization interval
+struct myuint64 {
+ uint high, low;
+};
-uint get_rans_byte(uint offset)
-{
- // We assume little endian.
- return bitfieldExtract(data_SSBO[offset >> 2], 8 * int(offset & 3u), 8);
-}
+const uint RANS64_L = (1u << 31); // lower bound of our normalization interval
-uint RansDecInit(inout uint offset)
+myuint64 RansDecInit(inout uint offset)
{
- uint x;
-
- x = get_rans_byte(offset);
- x |= get_rans_byte(offset + 1) << 8;
- x |= get_rans_byte(offset + 2) << 16;
- x |= get_rans_byte(offset + 3) << 24;
- offset += 4;
-
+ myuint64 x;
+ x.low = data_SSBO[offset++];
+ x.high = data_SSBO[offset++];
return x;
}
-uint RansDecGet(uint r, uint scale_bits)
+uint RansDecGet(myuint64 r, uint scale_bits)
{
- return r & ((1u << scale_bits) - 1);
+ return r.low & ((1u << scale_bits) - 1);
}
-void RansDecAdvance(inout uint rans, inout uint offset, const uint start, const uint freq, uint prob_bits)
+void RansDecAdvance(inout myuint64 rans, inout uint offset, const uint start, const uint freq, uint prob_bits)
{
const uint mask = (1u << prob_bits) - 1;
- rans = freq * (rans >> prob_bits) + (rans & mask) - start;
-
+ const uint recovered_lowbits = (rans.low & mask) - start;
+
+ // rans >>= prob_bits;
+ rans.low = (rans.low >> prob_bits) | ((rans.high & mask) << (32 - prob_bits));
+ rans.high >>= prob_bits;
+
+ // rans *= freq;
+ uint h1, l1, h2, l2;
+ umulExtended(rans.low, freq, h1, l1);
+ umulExtended(rans.high, freq, h2, l2);
+ rans.low = l1;
+ rans.high = l2 + h1;
+
+ // rans += recovered_lowbits;
+ uint carry;
+ rans.low = uaddCarry(rans.low, recovered_lowbits, carry);
+ rans.high += carry;
+
// renormalize
- while (rans < RANS_BYTE_L) {
- rans = (rans << 8) | get_rans_byte(offset++);
+ if (rans.high == 0 && rans.low < RANS64_L) {
+ rans.high = rans.low;
+ rans.low = data_SSBO[offset++];
}
}
local_timing[0] = start;
#endif
+ const uint blocks_per_row = (imageSize(out_tex).x + 7) / 8;
+
const uint local_x = gl_LocalInvocationID.x % 8;
const uint local_y = (gl_LocalInvocationID.x / 8) % 8;
const uint local_z = gl_LocalInvocationID.x / 64;
const uint sign_bias = sign_bias_per_model[model_num];
// Initialize rANS decoder.
- uint offset = streams[stream_num].src_offset;
- uint rans = RansDecInit(offset);
+ uint offset = streams[stream_num].src_offset >> 2;
+ myuint64 rans = RansDecInit(offset);
float q = (coeff_num == 0) ? 1.0 : (quant_matrix[coeff_num] * quant_scalefac / 128.0 / sqrt(2.0)); // FIXME: fold
q *= (1.0 / 255.0);
//int w = (coeff_num == 0) ? 32 : int(quant_matrix[coeff_num]);
- int last_k = 0;
+ int last_k = 128;
pick_timer(start, local_timing[0]);
- for (uint block_idx = 40; block_idx --> 0; ) {
+ for (uint block_idx = BLOCKS_PER_STREAM / 8; block_idx --> 0; ) {
pick_timer(start, local_timing[1]);
// rANS decode one coefficient across eight blocks (so 64x8 coefficients).
bool sign = false;
if (bottom_bits >= sign_bias) {
bottom_bits -= sign_bias;
- rans -= sign_bias;
+ rans.low -= sign_bias;
sign = true;
}
int k = int(cum2sym(bottom_bits, model_num)); // Can go out-of-bounds; that will return zero.
if (sign) {
k = -k;
}
+#if 0
+ if (coeff_num == 0) {
+ //imageStore(coeff_tex, ivec2((block_row * 40 + block_idx) * 8 + subblock_idx, 0), ivec4(k, 0,0,0));
+ imageStore(coeff_tex, ivec2((block_row * 40 + block_idx) * 8 + subblock_idx, 0), ivec4(rans.low, 0,0,0));
+ imageStore(coeff2_tex, ivec2((block_row * 40 + block_idx) * 8 + subblock_idx, 0), ivec4(rans.high, 0,0,0));
+ }
+#endif
if (coeff_num == 0) {
k += last_k;
last_k = k;
}
-#if 0
- uint y = block_row * 16 + block_y * 8 + local_y;
- uint x = block_x * 64 + subblock_idx * 8 + local_x;
- imageStore(coeff_tex, ivec2(x, y), ivec4(k, 0,0,0));
-#endif
temp[slice_num * 64 * 8 + subblock_idx * 64 + coeff_num] = k * q;
//temp[subblock_idx * 64 + 8 * y + x] = (2 * k * w * 4) / 32; // 100% matching unquant
pick_timer(start, local_timing[6]);
uint global_block_idx = (block_row * 40 + block_idx) * 8 + local_y;
- uint block_x = global_block_idx % 160;
- uint block_y = global_block_idx / 160;
+ uint block_x = global_block_idx % blocks_per_row;
+ uint block_y = global_block_idx / blocks_per_row;
uint y = block_y * 8;
uint x = block_x * 8 + local_x;