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comparison vdp.c @ 1437:da72344af3ff

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Fix external v counter when normal resolution interlace mode is active
author Michael Pavone <pavone@retrodev.com>
date Mon, 21 Aug 2017 23:49:56 -0700
parents 40c3be9f1af7
children a664bade4b29
comparison
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1436:40c3be9f1af7 1437:da72344af3ff
2955 } 2955 }
2956 } 2956 }
2957 2957
2958 static uint16_t get_ext_vcounter(vdp_context *context) 2958 static uint16_t get_ext_vcounter(vdp_context *context)
2959 { 2959 {
2960 uint16_t line= context->vcounter & 0xFF; 2960 uint16_t line= context->vcounter;
2961 if (context->double_res) { 2961 if (context->regs[REG_MODE_4] & BIT_INTERLACE) {
2962 line <<= 1; 2962 if (context->double_res) {
2963 line <<= 1;
2964 } else {
2965 line &= 0x1FE;
2966 }
2963 if (line & 0x100) { 2967 if (line & 0x100) {
2964 line |= 1; 2968 line |= 1;
2965 } 2969 }
2966 } 2970 }
2967 return line << 8; 2971 return line << 8;