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comparison vdp.c @ 2411:efd2242c2c23

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Fix silly TMS9918A bug, make CRAM viewer sorta useful in TMS9918A modes, make mode4 address map externally viewable for debugger
author Michael Pavone <pavone@retrodev.com>
date Thu, 04 Jan 2024 22:13:46 -0800
parents ce9f5a42c481
children dc05f1805921
comparison
equal deleted inserted replaced
2410:f1574b22d5d9 2411:efd2242c2c23
58 INACTIVE = 0, 58 INACTIVE = 0,
59 PREPARING, //used for line 0x1FF 59 PREPARING, //used for line 0x1FF
60 ACTIVE 60 ACTIVE
61 }; 61 };
62 62
63 static uint16_t mode4_address_map[0x4000]; 63 uint16_t mode4_address_map[0x4000];
64 static uint32_t planar_to_chunky[256]; 64 static uint32_t planar_to_chunky[256];
65 static uint8_t levels[] = {0, 27, 49, 71, 87, 103, 119, 130, 146, 157, 174, 190, 206, 228, 255}; 65 static uint8_t levels[] = {0, 27, 49, 71, 87, 103, 119, 130, 146, 157, 174, 190, 206, 228, 255};
66 66
67 static uint8_t debug_base[][3] = { 67 static uint8_t debug_base[][3] = {
68 {127, 127, 127}, //BG 68 {127, 127, 127}, //BG
2028 for (int x = 0; x < 8; x++) 2028 for (int x = 0; x < 8; x++)
2029 { 2029 {
2030 *(fb++) = context->colors[i]; 2030 *(fb++) = context->colors[i];
2031 } 2031 }
2032 } 2032 }
2033 } else { 2033 } else if (context->type == VDP_GENESIS || (context->regs[REG_MODE_1] & BIT_MODE_4)) {
2034 for (int i = MODE4_OFFSET; i < MODE4_OFFSET+32; i++) 2034 for (int i = MODE4_OFFSET; i < MODE4_OFFSET+32; i++)
2035 { 2035 {
2036 for (int x = 0; x < 16; x++) 2036 for (int x = 0; x < 16; x++)
2037 { 2037 {
2038 *(fb++) = context->colors[i]; 2038 *(fb++) = context->colors[i];
2039 }
2040 }
2041 } else if (context->type != VDP_GENESIS) {
2042 uint16_t address = context->regs[REG_COLOR_TABLE] << 6;
2043 for (int i = 0; i < 32; i++, address++)
2044 {
2045 uint8_t entry = context->vdpmem[mode4_address_map[address] ^ 1];
2046 uint8_t fg = entry >> 4, bg = entry & 0xF;
2047 uint32_t fg_full, bg_full;
2048 if (context->type == VDP_GAMEGEAR) {
2049 //Game Gear uses CRAM entries 16-31 for TMS9918A modes
2050 fg_full = context->colors[fg + 16 + MODE4_OFFSET];
2051 bg_full = context->colors[bg + 16 + MODE4_OFFSET];
2052 } else {
2053 fg <<= 1;
2054 fg = (fg & 0xE) | (fg << 1 & 0x20);
2055 fg_full = context->color_map[fg | FBUF_TMS];
2056 bg <<= 1;
2057 bg = (bg & 0xE) | (bg << 1 & 0x20);
2058 bg_full = context->color_map[bg | FBUF_TMS];
2059 }
2060 for (int x = 0; x < 8; x++)
2061 {
2062 *(fb++) = fg_full;
2063 }
2064 for (int x = 0; x < 8; x++)
2065 {
2066 *(fb++) = bg_full;
2039 } 2067 }
2040 } 2068 }
2041 } 2069 }
2042 } 2070 }
2043 if ( 2071 if (
3634 //Multicolor 3662 //Multicolor
3635 external_slot(context); 3663 external_slot(context);
3636 return; 3664 return;
3637 } 3665 }
3638 uint16_t address = context->regs[REG_COLOR_TABLE] << 6; 3666 uint16_t address = context->regs[REG_COLOR_TABLE] << 6;
3639 if (context->regs[REG_MODE_2] & BIT_M3) { 3667 if (context->regs[REG_MODE_1] & BIT_M3) {
3640 //Graphics II 3668 //Graphics II
3641 uint16_t upper_vcounter_mask; 3669 uint16_t upper_vcounter_mask;
3642 uint16_t pattern_name_mask; 3670 uint16_t pattern_name_mask;
3643 if (context->type > VDP_SMS2) { 3671 if (context->type > VDP_SMS2) {
3644 //SMS1 and TMS9918A 3672 //SMS1 and TMS9918A