shithub: psxe

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Fix MDEC YCbCr ordering

--- a/psx/dev/mdec.c

+++ b/psx/dev/mdec.c

@@ -116,6 +116,19 @@

     return src;

 }

+//   for y=0 to 7

+//     for x=0 to 7

+//       R=[Crblk+((x+xx)/2)+((y+yy)/2)*8], B=[Cbblk+((x+xx)/2)+((y+yy)/2)*8]

+//       G=(-0.3437*B)+(-0.7143*R), R=(1.402*R), B=(1.772*B)

+//       Y=[Yblk+(x)+(y)*8]

+//       R=MinMax(-128,127,(Y+R))

+//       G=MinMax(-128,127,(Y+G))

+//       B=MinMax(-128,127,(Y+B))

+//       if unsigned then BGR=BGR xor 808080h  ;aka add 128 to the R,G,B values

+//       dst[(x+xx)+(y+yy)*16]=BGR

+//     next x

+//   next y

+

 void yuv_to_rgb(psx_mdec_t* mdec, uint8_t* buf, int xx, int yy) {

     for (int y = 0; y < 8; y++) {

         for (int x = 0; x < 8; x++) {

@@ -206,9 +219,9 @@

             in = rl_decode_block(mdec->yblk, in, mdec->y_quant_table, mdec->scale_table);

             yuv_to_rgb(mdec, &mdec->output[(block_count * size) - block_size], 0, 0);

             in = rl_decode_block(mdec->yblk, in, mdec->y_quant_table, mdec->scale_table);

-            yuv_to_rgb(mdec, &mdec->output[(block_count * size) - block_size], 0, 8);

-            in = rl_decode_block(mdec->yblk, in, mdec->y_quant_table, mdec->scale_table);

             yuv_to_rgb(mdec, &mdec->output[(block_count * size) - block_size], 8, 0);

+            in = rl_decode_block(mdec->yblk, in, mdec->y_quant_table, mdec->scale_table);

+            yuv_to_rgb(mdec, &mdec->output[(block_count * size) - block_size], 0, 8);

             in = rl_decode_block(mdec->yblk, in, mdec->y_quant_table, mdec->scale_table);

             yuv_to_rgb(mdec, &mdec->output[(block_count * size) - block_size], 8, 8);

-- 

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