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VDP DMA/CPU access timing improvements
This commit is contained in:
kub
parent
5e04c2f37f
commit
1886ac5f30
4 changed files with 126 additions and 193 deletions
176
pico/misc.c
176
pico/misc.c
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@ -1,7 +1,6 @@
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/*
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* rarely used EEPROM code
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* (C) notaz, 2006-2008
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* (C) kub, 2020
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*
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* This work is licensed under the terms of MAME license.
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* See COPYING file in the top-level directory.
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@ -9,181 +8,6 @@
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#include "pico_int.h"
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// H-counter table for hvcounter reads in 40col mode, starting at HINT
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const unsigned char hcounts_40[] = {
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0xa5,0xa6,0xa7,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xae,0xaf,0xb0,0xb1,0xb2,
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0xb3,0xb4,0xb5,0xb5,0xe4,0xe5,0xe6,0xe7,0xe8,0xe8,0xe9,0xea,0xea,0xeb,0xec,0xed,
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0xed,0xee,0xef,0xef,0xf0,0xf1,0xf2,0xf2,0xf3,0xf4,0xf4,0xf5,0xf6,0xf7,0xf7,0xf8,
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0xf9,0xfa,0xfb,0xfc,0xfd,0xfd,0xfe,0xff,0x00,0x01,0x02,0x03,0x04,0x04,0x05,0x06,
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0x07,0x08,0x09,0x0a,0x0b,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x12,0x13,0x14,
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0x15,0x16,0x17,0x18,0x19,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0x20,0x20,0x21,0x22,
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0x23,0x24,0x25,0x26,0x27,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2e,0x2f,0x30,
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0x31,0x32,0x33,0x34,0x35,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3c,0x3d,0x3e,
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0x3f,0x40,0x41,0x42,0x43,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4a,0x4b,0x4c,
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0x4d,0x4e,0x4f,0x50,0x51,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x58,0x59,0x5a,
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0x5b,0x5c,0x5d,0x5e,0x5f,0x5f,0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x66,0x67,0x68,
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0x69,0x6a,0x6b,0x6c,0x6d,0x6d,0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x74,0x75,0x76,
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0x77,0x78,0x79,0x7a,0x7b,0x7b,0x7c,0x7d,0x7e,0x7f,0x80,0x81,0x82,0x82,0x83,0x84,
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0x85,0x86,0x87,0x88,0x89,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,0x90,0x90,0x91,0x92,
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0x93,0x94,0x95,0x96,0x97,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9e,0x9f,0xa0,
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0xa1,0xa2,0xa3,0xa4,0xa5,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xac,0xad,0xae,
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};
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// H-counter table for hvcounter reads in 32col mode, starting at HINT
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const unsigned char hcounts_32[] = {
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0x85,0x86,0x86,0x87,0x88,0x88,0x89,0x8a,0x8a,0x8b,0x8c,0x8d,0x8d,0x8e,0x8f,0x8f,
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0x90,0x91,0x91,0x92,0x93,0xe9,0xe9,0xea,0xeb,0xeb,0xec,0xed,0xed,0xee,0xef,0xf0,
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0xf0,0xf1,0xf2,0xf2,0xf3,0xf4,0xf4,0xf5,0xf6,0xf7,0xf7,0xf8,0xf9,0xf9,0xfa,0xfb,
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0xfb,0xfc,0xfd,0xfe,0xfe,0xff,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x05,0x06,
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0x07,0x07,0x08,0x09,0x09,0x0a,0x0b,0x0c,0x0c,0x0d,0x0e,0x0e,0x0f,0x10,0x10,0x11,
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0x12,0x13,0x13,0x14,0x15,0x15,0x16,0x17,0x17,0x18,0x19,0x1a,0x1a,0x1b,0x1c,0x1c,
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0x1d,0x1e,0x1e,0x1f,0x20,0x21,0x21,0x22,0x23,0x23,0x24,0x25,0x25,0x26,0x27,0x28,
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0x28,0x29,0x2a,0x2a,0x2b,0x2c,0x2c,0x2d,0x2e,0x2f,0x2f,0x30,0x31,0x31,0x32,0x33,
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0x33,0x34,0x35,0x36,0x36,0x37,0x38,0x38,0x39,0x3a,0x3a,0x3b,0x3c,0x3d,0x3d,0x3e,
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0x3f,0x3f,0x40,0x41,0x41,0x42,0x43,0x44,0x44,0x45,0x46,0x46,0x47,0x48,0x48,0x49,
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0x4a,0x4b,0x4b,0x4c,0x4d,0x4d,0x4e,0x4f,0x4f,0x50,0x51,0x52,0x52,0x53,0x54,0x54,
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0x55,0x56,0x56,0x57,0x58,0x59,0x59,0x5a,0x5b,0x5b,0x5c,0x5d,0x5d,0x5e,0x5f,0x60,
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0x60,0x61,0x62,0x62,0x63,0x64,0x64,0x65,0x66,0x67,0x67,0x68,0x69,0x69,0x6a,0x6b,
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0x6b,0x6c,0x6d,0x6e,0x6e,0x6f,0x70,0x70,0x71,0x72,0x72,0x73,0x74,0x75,0x75,0x76,
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0x77,0x77,0x78,0x79,0x79,0x7a,0x7b,0x7c,0x7c,0x7d,0x7e,0x7e,0x7f,0x80,0x80,0x81,
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0x82,0x83,0x83,0x84,0x85,0x85,0x86,0x87,0x87,0x88,0x89,0x8a,0x8a,0x8b,0x8c,0x8c,
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};
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// VDP transfer slots for blanked and active display in 32col and 40col mode.
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// 1 slot is 488/171 = 2.8538 68k cycles in h32, and 488/210 = 2.3238 in h40
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// In blanked display, all slots but 5(h32) / 6(h40) are usable for transfers,
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// in active display only 16(h32) / 18(h40) slots can be used.
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// NB the cyc2sl tables should cover 2 slot into the next scanline, in case the
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// last insn in the old scanline is a 32 bit VDP access. That is currently not
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// the case for active display.
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// XXX inactive tables by slot#=cycles*maxslot#/488. should be through hv tables
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// VDP transfer slots in inactive (blanked) display 32col mode.
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// refresh slots: 250, 26, 58, 90, 122 -> 32, 64, 96, 128, 160
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const unsigned char vdpcyc2sl_32_bl[] = { // 68k cycles/2 to slot #
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// 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
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0, 0, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 10,
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10, 11, 12, 12, 13, 14, 14, 15, 16, 17, 17, 18, 19, 19, 20, 21,
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21, 22, 23, 23, 24, 25, 25, 26, 27, 27, 28, 29, 29, 30, 31, 31,
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32, 33, 34, 34, 35, 36, 36, 37, 38, 38, 39, 40, 40, 41, 42, 42,
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43, 44, 44, 45, 46, 46, 47, 48, 48, 49, 50, 51, 51, 52, 53, 53,
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54, 55, 55, 56, 57, 57, 58, 59, 59, 60, 61, 61, 62, 63, 63, 64,
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65, 65, 66, 67, 68, 68, 69, 70, 70, 71, 72, 72, 73, 74, 74, 75,
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76, 76, 77, 78, 78, 79, 80, 80, 81, 82, 83, 83, 84, 85, 85, 86,
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87, 87, 88, 89, 89, 90, 91, 91, 92, 93, 93, 94, 95, 95, 96, 97,
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97, 98, 99,100,100,101,102,102,103,104,104,105,106,106,107,108,
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108,109,110,110,111,112,112,113,114,114,115,116,117,117,118,119,
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119,120,121,121,122,123,123,124,125,125,126,127,127,128,129,129,
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130,131,131,132,133,134,134,135,136,136,137,138,138,139,140,140,
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141,142,142,143,144,144,145,146,146,147,148,148,149,150,151,151,
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152,153,153,154,155,155,156,157,157,158,159,159,160,161,161,162,
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163,163,164,165,166,166,167,168,168,169,170,170,171,172,172,173,
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};
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// VDP transfer slots in inactive (blanked) display 40col mode.
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// refresh slots: 250, 26, 58, 90, 122, 154 -> 40, 72, 104, 136, 168, 200
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const unsigned char vdpcyc2sl_40_bl[] = { // 68k cycles/2 to slot #
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// 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
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0, 0, 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10, 10, 11, 12,
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13, 14, 15, 15, 16, 17, 18, 19, 20, 20, 21, 22, 23, 24, 25, 25,
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26, 27, 28, 29, 30, 30, 31, 32, 33, 34, 35, 35, 36, 37, 38, 39,
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40, 40, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 51, 52,
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53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 61, 62, 63, 64, 65, 66,
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66, 67, 68, 69, 70, 71, 71, 72, 73, 74, 75, 76, 76, 77, 78, 79,
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80, 81, 81, 82, 83, 84, 85, 86, 86, 87, 88, 89, 90, 91, 91, 92,
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93, 94, 95, 96, 96, 97, 98, 99,100,101,102,102,103,104,105,106,
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107,107,108,109,110,111,112,112,113,114,115,116,117,117,118,119,
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120,121,122,122,123,124,125,126,127,127,128,129,130,131,132,132,
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133,134,135,136,137,137,138,139,140,141,142,142,143,144,145,146,
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147,147,148,149,150,151,152,153,153,154,155,156,157,158,158,159,
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160,161,162,163,163,164,165,166,167,168,168,169,170,171,172,173,
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173,174,175,176,177,178,178,179,180,181,182,183,183,184,185,186,
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187,188,188,189,190,191,192,193,193,194,195,196,197,198,198,199,
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200,201,202,203,204,204,205,206,207,208,209,209,210,211,212,213,
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};
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// VDP transfer slots in active display 32col mode. Transfer slots (Hint=0):
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// 11,25,40,48,56,72,80,88,104,112,120,136,144,152,167,168
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const unsigned char vdpcyc2sl_32[] = { // 68k cycles/2 to slot #
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// 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
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2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5,
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8,
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8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10,
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10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11,
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11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
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11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13,
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13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14,
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14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15,
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16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
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};
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// VDP transfer slots in active display 40col mode. Transfer slots (Hint=0):
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// 21,47,55,63,79,87,95,111,119,127,143,151,159,175,183,191,206,207
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const unsigned char vdpcyc2sl_40[] = { // 68k cycles/2 to slot #
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// 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0
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0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, // 32
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64
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1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, // 96
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3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, // 128
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, // 160
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5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, // 192
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // 224
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7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, // 256
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9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, // 288
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10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, // 320
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12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, // 352
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13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, // 384
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14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, // 416
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16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 17, // 448
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18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, // 480
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};
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// NB the sl2cyc tables must cover all slots present in the cyc2sl tables.
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// XXX inactive tables by cyc=slot#*488/maxslot#. should be through hv tables
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const unsigned short vdpsl2cyc_32_bl[] = { // slot # to 68k cycles/2
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0, 2, 3, 5, 6, 8, 9, 11, 12, 14, 15, 17, 18, 20, 21, 23,
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24, 25, 27, 28, 30, 31, 33, 34, 36, 37, 39, 40, 42, 43, 45, 46,
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48, 49, 50, 52, 53, 55, 56, 58, 59, 61, 62, 64, 65, 67, 68, 70,
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71, 73, 74, 75, 77, 78, 80, 81, 83, 84, 86, 87, 89, 90, 92, 93,
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95, 96, 98, 99,100,102,103,105,106,108,109,111,112,114,115,117,
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118,120,121,122,124,125,127,128,130,131,133,134,136,137,139,140,
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142,143,145,146,147,149,150,152,153,155,156,158,159,161,162,164,
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165,167,168,170,171,172,174,175,177,178,180,181,183,184,186,187,
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189,190,192,193,195,196,197,199,200,202,203,205,206,208,209,211,
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212,214,215,217,218,220,221,222,224,225,227,228,230,231,233,234,
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236,237,239,240,242,243,244,246,247,249,250,252,253,255,256
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};
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const unsigned short vdpsl2cyc_40_bl[] = { // slot # to 68k cycles/2
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0, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18,
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20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 32, 33, 34, 35, 36, 38,
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39, 40, 41, 42, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 56, 57,
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58, 59, 60, 61, 63, 64, 65, 66, 67, 69, 70, 71, 72, 73, 75, 76,
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77, 78, 79, 81, 82, 83, 84, 85, 87, 88, 89, 90, 91, 93, 94, 95,
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96, 97, 99,100,101,102,103,105,106,107,108,109,111,112,113,114,
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115,117,118,119,120,121,122,124,125,126,127,128,130,131,132,133,
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134,136,137,138,139,140,142,143,144,145,146,148,149,150,151,152,
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154,155,156,157,158,160,161,162,163,164,166,167,168,169,170,172,
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173,174,175,176,178,179,180,181,182,183,185,186,187,188,189,191,
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192,193,194,195,197,198,199,200,201,203,204,205,206,207,209,210,
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211,212,213,215,216,217,218,219,221,222,223,224,225,227,228,229,
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230,231,233,234,235,236,237,239,240,241,242,243,244,246,247,248,
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249,250,252,253,254,255,257
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};
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const unsigned short vdpsl2cyc_32[] = { // slot # to 68k cycles/2
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0, 16, 36, 56, 67, 79,102,113,125,148,159,171,194,205,217,239,
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240,260,280
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};
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const unsigned short vdpsl2cyc_40[] = { // slot # to 68k cycles/2
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0, 24, 55, 64, 73, 92,101,110,129,138,147,166,175,184,203,212,
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221,239,240,268,299
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};
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#ifndef _ASM_MISC_C
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PICO_INTERNAL_ASM void memcpy16bswap(unsigned short *dest, void *src, int count)
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@ -40,6 +40,7 @@ void PicoInit(void)
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Pico32xInit();
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PsndInit();
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PicoVideoInit();
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PicoDrawInit();
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PicoDraw2Init();
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}
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@ -878,6 +878,7 @@ void PicoVideoFIFOSync(int cycles);
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int PicoVideoFIFOHint(void);
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void PicoVideoFIFOMode(int active, int h40);
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int PicoVideoFIFOWrite(int count, int byte_p, unsigned sr_mask, unsigned sr_flags);
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void PicoVideoInit(void);
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void PicoVideoSave(void);
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void PicoVideoLoad(void);
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void PicoVideoCacheSAT(void);
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141
pico/videoport.c
141
pico/videoport.c
|
|
@ -2,7 +2,7 @@
|
|||
* PicoDrive
|
||||
* (c) Copyright Dave, 2004
|
||||
* (C) notaz, 2006-2009
|
||||
* (C) kub, 2020
|
||||
* (C) kub, 2020,2021
|
||||
*
|
||||
* This work is licensed under the terms of MAME license.
|
||||
* See COPYING file in the top-level directory.
|
||||
|
|
@ -12,11 +12,118 @@
|
|||
#define NEED_DMA_SOURCE
|
||||
#include "memory.h"
|
||||
|
||||
extern const unsigned char hcounts_32[], hcounts_40[];
|
||||
extern const unsigned char vdpcyc2sl_32_bl[], vdpcyc2sl_40_bl[];
|
||||
extern const unsigned char vdpcyc2sl_32[], vdpcyc2sl_40[];
|
||||
extern const unsigned short vdpsl2cyc_32_bl[], vdpsl2cyc_40_bl[];
|
||||
extern const unsigned short vdpsl2cyc_32[], vdpsl2cyc_40[];
|
||||
|
||||
enum { clkdiv = 2 }; // CPU clock granularity: one of 1,2,4,8
|
||||
|
||||
// VDP Slot timing, taken from http://gendev.spritesmind.net/
|
||||
// forum/viewtopic.php?f=22&t=851&sid=d5701a71396ee7f700c74fb7cd85cb09
|
||||
// Thank you very much for the great work, Nemesis!
|
||||
|
||||
// 1 slot is 488/171 = 2.8538 68k cycles in h32, and 488/210 = 2.3238 in h40.
|
||||
|
||||
// VDP has a slot counter running from 0x00 to 0xff every scanline, but it has
|
||||
// a gap depending on the video mode. The slot in which a horizontal interrupt
|
||||
// is generated also depends on the video mode.
|
||||
enum { hint32 = 0x84, gapstart32 = 0x94, gapend32 = 0xe9 };
|
||||
enum { hint40 = 0xa4, gapstart40 = 0xb7, gapend40 = 0xe5 };
|
||||
|
||||
// number of slots in a scanline
|
||||
#define slots32 (0x100-(gapend32-gapstart32)) // 171
|
||||
#define slots40 (0x100-(gapend40-gapstart40)) // 210
|
||||
|
||||
// In blanked display, all slots but the refresh slots are usable for transfers,
|
||||
// in active display only 16(h32) / 18(h40) slots can be used.
|
||||
|
||||
// dma and refresh slots for active display, 16 for H32
|
||||
static u8 dmaslots32[] =
|
||||
{ 145,243, 2,10,18, 34,42,50, 66,74,82, 98,106,114, 129,130 };
|
||||
static u8 refslots32[] =
|
||||
{ 250, 26, 58, 90, 122 };
|
||||
// dma and refresh slots for active display, 18 for H40
|
||||
static u8 dmaslots40[] =
|
||||
{ 232, 2,10,18, 34,42,50, 66,74,82, 98,106,114, 130,138,146, 161,162 };
|
||||
static u8 refslots40[] =
|
||||
{ 250, 26, 58, 90, 122, 154 };
|
||||
|
||||
// table sizes
|
||||
enum { cycsz = 488/clkdiv };
|
||||
enum { sl32blsz=slots32-sizeof(refslots32)+1, sl32acsz=sizeof(dmaslots32)+1 };
|
||||
enum { sl40blsz=slots40-sizeof(refslots40)+1, sl40acsz=sizeof(dmaslots40)+1 };
|
||||
|
||||
// Tables must be considerably larger than one scanline, since 68k emulation
|
||||
// isn't stopping in the middle of an operation. If the last op is a 32 bit
|
||||
// VDP write 2 slots may need to be taken from the next scanline, which can be
|
||||
// more than 100 CPU cycles. For safety just cover 2 scanlines.
|
||||
|
||||
// table for mapping hvcounter reads
|
||||
static u8 hcounts_32[2*cycsz], hcounts_40[2*cycsz];
|
||||
// tables mapping cycles to slots
|
||||
static u16 vdpcyc2sl_32_bl[2*cycsz],vdpcyc2sl_40_bl[2*cycsz];
|
||||
static u16 vdpcyc2sl_32_ac[2*cycsz],vdpcyc2sl_40_ac[2*cycsz];
|
||||
// tables mapping slots to cycles
|
||||
// NB the sl2cyc tables must cover all slots present in the cyc2sl tables.
|
||||
static u16 vdpsl2cyc_32_bl[2*sl32blsz],vdpsl2cyc_40_bl[2*sl40blsz];
|
||||
static u16 vdpsl2cyc_32_ac[2*sl32acsz],vdpsl2cyc_40_ac[2*sl40acsz];
|
||||
|
||||
|
||||
// calculate timing tables for one mode (H32 or H40)
|
||||
// NB tables aligned to HINT, since the main loop uses HINT as synchronization
|
||||
#define INITTABLES(s) { \
|
||||
float factor = 488./slots##s; \
|
||||
int ax, bx, rx, ac, bc; \
|
||||
int i, n; \
|
||||
\
|
||||
/* calculate internal VDP slot numbers */ \
|
||||
for (i = 0; i < cycsz; i++) { \
|
||||
n = hint##s + i*clkdiv/factor; \
|
||||
if (n >= gapstart##s) n += gapend##s-gapstart##s; \
|
||||
hcounts_##s[i] = n % 256; \
|
||||
} \
|
||||
memcpy(hcounts_##s+cycsz, hcounts_##s, ARRAY_SIZE(hcounts_##s)-cycsz);\
|
||||
\
|
||||
ax = bx = ac = bc = rx = 0; \
|
||||
for (i = 0; i < cycsz; i++) { \
|
||||
n = hcounts_##s[i]; \
|
||||
if (i == 0 || n != hcounts_##s[i-1]) { \
|
||||
/* fill slt <=> cycle tables, active scanline */ \
|
||||
if (ax < ARRAY_SIZE(dmaslots##s) && dmaslots##s[ax] == n) { \
|
||||
vdpsl2cyc_##s##_ac[++ax]=i; \
|
||||
while (ac < i) vdpcyc2sl_##s##_ac[ac++] = ax-1; \
|
||||
} \
|
||||
/* fill slt <=> cycle tables, scanline off */ \
|
||||
if (rx >= ARRAY_SIZE(refslots##s) || refslots##s[rx] != n) { \
|
||||
vdpsl2cyc_##s##_bl[++bx]=i; \
|
||||
while (bc < i) vdpcyc2sl_##s##_bl[bc++] = bx-1; \
|
||||
} else \
|
||||
++rx; \
|
||||
} \
|
||||
} \
|
||||
/* fill up cycle to slot mappings for last slot */ \
|
||||
while (ac < cycsz) \
|
||||
vdpcyc2sl_##s##_ac[ac] = ARRAY_SIZE(dmaslots##s), ac++; \
|
||||
while (bc < cycsz) \
|
||||
vdpcyc2sl_##s##_bl[bc] = slots##s-ARRAY_SIZE(refslots##s), bc++; \
|
||||
/* extend tables for 2nd scanline */ \
|
||||
i = ARRAY_SIZE(dmaslots##s); \
|
||||
while (ac < ARRAY_SIZE(vdpcyc2sl_##s##_ac)) \
|
||||
vdpcyc2sl_##s##_ac[ac] = vdpcyc2sl_##s##_ac[ac-cycsz]+i, ac++; \
|
||||
while (ax < ARRAY_SIZE(vdpsl2cyc_##s##_ac)-1) ax++, \
|
||||
vdpsl2cyc_##s##_ac[ax] = vdpsl2cyc_##s##_ac[ax-i]+cycsz;\
|
||||
i = slots##s - ARRAY_SIZE(refslots##s); \
|
||||
while (bc < ARRAY_SIZE(vdpcyc2sl_##s##_bl)) \
|
||||
vdpcyc2sl_##s##_bl[bc] = vdpcyc2sl_##s##_bl[bc-cycsz]+i, bc++; \
|
||||
while (bx < ARRAY_SIZE(vdpsl2cyc_##s##_bl)-1) bx++, \
|
||||
vdpsl2cyc_##s##_bl[bx] = vdpsl2cyc_##s##_bl[bx-i]+cycsz; \
|
||||
}
|
||||
|
||||
|
||||
// initialize VDP timing tables
|
||||
void PicoVideoInit(void)
|
||||
{
|
||||
INITTABLES(32);
|
||||
INITTABLES(40);
|
||||
}
|
||||
|
||||
|
||||
static int blankline; // display disabled for this line
|
||||
|
||||
|
|
@ -69,16 +176,17 @@ static struct VdpFIFO { // XXX this must go into save file!
|
|||
unsigned short fifo_slot; // last executed slot in current scanline
|
||||
unsigned short fifo_maxslot;// #slots in scanline
|
||||
|
||||
const unsigned char *fifo_cyc2sl;
|
||||
const unsigned short *fifo_cyc2sl;
|
||||
const unsigned short *fifo_sl2cyc;
|
||||
} VdpFIFO;
|
||||
|
||||
enum { FQ_BYTE = 1, FQ_BGDMA = 2, FQ_FGDMA = 4 }; // queue flags, NB: BYTE = 1!
|
||||
|
||||
// NB must limit cyc2sl to table size in case 68k overdraws its aim. That can
|
||||
// happen if the last insn is a blocking acess to VDP, or for exceptions (e.g.irq)
|
||||
#define Cyc2Sl(vf,lc) ((lc) < 256*2 ? vf->fifo_cyc2sl[(lc)>>1] : vf->fifo_cyc2sl[255])
|
||||
#define Sl2Cyc(vf,sl) (vf->fifo_sl2cyc[sl]*2)
|
||||
|
||||
// NB should limit cyc2sl to table size in case 68k overdraws its aim. That can
|
||||
// happen if the last op is a blocking acess to VDP, or for exceptions (e.g.irq)
|
||||
#define Cyc2Sl(vf,lc) (vf->fifo_cyc2sl[(lc)/clkdiv])
|
||||
#define Sl2Cyc(vf,sl) (vf->fifo_sl2cyc[sl]*clkdiv)
|
||||
|
||||
// do the FIFO math
|
||||
static __inline int AdvanceFIFOEntry(struct VdpFIFO *vf, struct PicoVideo *pv, int slots)
|
||||
|
|
@ -263,7 +371,7 @@ int PicoVideoFIFOWrite(int count, int flags, unsigned sr_mask,unsigned sr_flags)
|
|||
|
||||
// update FIFO state if it was empty
|
||||
if (!(pv->status & PVS_FIFORUN)) {
|
||||
vf->fifo_slot = Cyc2Sl(vf, lc+9); // FIFO latency ~3 vdp slots
|
||||
vf->fifo_slot = Cyc2Sl(vf, lc+5); // FIFO latency ~3 vdp slots
|
||||
pv->status |= PVS_FIFORUN;
|
||||
pv->fifo_cnt = count << (flags & FQ_BYTE);
|
||||
}
|
||||
|
|
@ -300,10 +408,10 @@ int PicoVideoFIFOHint(void)
|
|||
// switch FIFO mode between active/inactive display
|
||||
void PicoVideoFIFOMode(int active, int h40)
|
||||
{
|
||||
static const unsigned char *vdpcyc2sl[2][2] =
|
||||
{ {vdpcyc2sl_32_bl, vdpcyc2sl_40_bl} , {vdpcyc2sl_32, vdpcyc2sl_40} };
|
||||
static const unsigned short *vdpcyc2sl[2][2] =
|
||||
{ {vdpcyc2sl_32_bl, vdpcyc2sl_40_bl},{vdpcyc2sl_32_ac, vdpcyc2sl_40_ac} };
|
||||
static const unsigned short *vdpsl2cyc[2][2] =
|
||||
{ {vdpsl2cyc_32_bl, vdpsl2cyc_40_bl} , {vdpsl2cyc_32, vdpsl2cyc_40} };
|
||||
{ {vdpsl2cyc_32_bl, vdpsl2cyc_40_bl},{vdpsl2cyc_32_ac, vdpsl2cyc_40_ac} };
|
||||
|
||||
struct VdpFIFO *vf = &VdpFIFO;
|
||||
struct PicoVideo *pv = &Pico.video;
|
||||
|
|
@ -316,11 +424,10 @@ void PicoVideoFIFOMode(int active, int h40)
|
|||
vf->fifo_cyc2sl = vdpcyc2sl[active][h40];
|
||||
vf->fifo_sl2cyc = vdpsl2cyc[active][h40];
|
||||
// recalculate FIFO slot for new mode
|
||||
vf->fifo_slot = Cyc2Sl(vf, lc)-1;
|
||||
vf->fifo_slot = Cyc2Sl(vf, lc);
|
||||
vf->fifo_maxslot = Cyc2Sl(vf, 488);
|
||||
}
|
||||
|
||||
|
||||
// VDP memory rd/wr
|
||||
|
||||
static __inline void AutoIncrement(void)
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue