X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=rans.shader;h=925543ef7dfa284d0fddbce411a61444438dbc9f;hb=dc3e3a2a88b2b1f0e177f613a8b355116e6020ff;hp=8e9c4226a80a0b8595f4072490f93c072cac710d;hpb=68af7105a45805cfd8d951313dbe35e678055b29;p=narabu

diff --git a/rans.shader b/rans.shader
index 8e9c422..925543e 100644
--- a/rans.shader
+++ b/rans.shader
@@ -97,7 +97,9 @@ void encode_coeff(int signed_k, uint sign_bias, inout RansEncoder enc)
 	uint k = abs(signed_k);
 
 	if (k >= ESCAPE_LIMIT) {
-		// ... boring stuff here
+		// Put the coefficient as a 1/(2^12) symbol _before_
+		// the 255 coefficient, since the decoder will read the
+		// 255 coefficient first.
 		RansEncPut(enc.rans, enc.rans_offset, k, 1, prob_bits);
 		k = ESCAPE_LIMIT;
 	}
@@ -125,7 +127,7 @@ void encode_9_7(uint streamgroup_num, uint coeff_row, layout(r16ui) restrict rea
 	uint sign_bias1 = ransdist[enc1.lut_base + 255].x + ransdist[enc1.lut_base + 255].y;
 	uint sign_bias2 = ransdist[enc2.lut_base + 255].x + ransdist[enc2.lut_base + 255].y;
 
-	for (uint subblock_idx = BLOCKS_PER_STREAM; subblock_idx --> 0; ) {
+	for (uint subblock_idx = 0; subblock_idx < BLOCKS_PER_STREAM; ++subblock_idx) {
 		// TODO: Use SSBOs instead of a texture?
 		uint x = (streamgroup_num * BLOCKS_PER_STREAM + subblock_idx) % 160;
 		uint y = (streamgroup_num * BLOCKS_PER_STREAM + subblock_idx) / 160;