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comparison vdp.c @ 1632:cc699c4966b1

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Fix order bytes of a word are written into VRAM from the FIFO. Fixes ticket 36, the graphical glitch in Road Rash 3
author Michael Pavone <pavone@retrodev.com>
date Mon, 05 Nov 2018 00:30:44 -0800
parents c4ba3177b72d
children e397766c3028
comparison
equal deleted inserted replaced
1631:c4ba3177b72d 1632:cc699c4966b1
894 { 894 {
895 case VRAM_WRITE: 895 case VRAM_WRITE:
896 if ((context->regs[REG_MODE_2] & (BIT_128K_VRAM|BIT_MODE_5)) == (BIT_128K_VRAM|BIT_MODE_5)) { 896 if ((context->regs[REG_MODE_2] & (BIT_128K_VRAM|BIT_MODE_5)) == (BIT_128K_VRAM|BIT_MODE_5)) {
897 vdp_check_update_sat(context, start->address, start->value); 897 vdp_check_update_sat(context, start->address, start->value);
898 write_vram_word(context, start->address, start->value); 898 write_vram_word(context, start->address, start->value);
899 } else if (start->partial == 3) {
900 vdp_check_update_sat_byte(context, start->address ^ 1, start->value);
901 write_vram_byte(context, start->address ^ 1, start->value);
899 } else if (start->partial) { 902 } else if (start->partial) {
900 //printf("VRAM Write: %X to %X at %d (line %d, slot %d)\n", start->value, start->address ^ 1, context->cycles, context->cycles/MCLKS_LINE, (context->cycles%MCLKS_LINE)/16); 903 //printf("VRAM Write: %X to %X at %d (line %d, slot %d)\n", start->value, start->address ^ 1, context->cycles, context->cycles/MCLKS_LINE, (context->cycles%MCLKS_LINE)/16);
901 uint8_t byte = start->partial == 2 ? start->value >> 8 : start->value; 904 uint8_t byte = start->value >> 8;
902 if (start->partial > 1) { 905 if (start->partial > 1) {
903 vdp_check_update_sat_byte(context, start->address ^ 1, byte); 906 vdp_check_update_sat_byte(context, start->address, byte);
904 } 907 }
905 write_vram_byte(context, start->address ^ 1, byte); 908 write_vram_byte(context, start->address, byte);
906 } else { 909 } else {
907 //printf("VRAM Write High: %X to %X at %d (line %d, slot %d)\n", start->value >> 8, start->address, context->cycles, context->cycles/MCLKS_LINE, (context->cycles%MCLKS_LINE)/16); 910 //printf("VRAM Write High: %X to %X at %d (line %d, slot %d)\n", start->value >> 8, start->address, context->cycles, context->cycles/MCLKS_LINE, (context->cycles%MCLKS_LINE)/16);
908 vdp_check_update_sat(context, start->address, start->value); 911 vdp_check_update_sat(context, start->address, start->value);
909 write_vram_byte(context, start->address, start->value >> 8); 912 write_vram_byte(context, start->address ^ 1, start->value);
910 start->partial = 1; 913 start->partial = 1;
911 //skip auto-increment and removal of entry from fifo 914 //skip auto-increment and removal of entry from fifo
912 return; 915 return;
913 } 916 }
914 break; 917 break;