1498 lines
48 KiB
C
1498 lines
48 KiB
C
/* This file is included into vb.c and cannot be compiled on its own. */
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#ifdef VBAPI
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/********************************** Macros ***********************************/
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/* Compute how many clocks are in some number of milliseconds */
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#define vipClocksMs(x) x * 20000
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/* Read a world line parameter value */
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#define vipParam(x) busReadBuffer(&sim->vip.ram[x], VB_U16)
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/******************************** Lookup Data ********************************/
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/* BG map arrangement by world background dimensions */
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static const uint8_t BG_TEMPLATES[][64] = {
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{ 0 }, /* 1x1 */
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{ 0, 1 }, /* 1x2 */
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{ 0, 1, 2, 3 }, /* 1x4 */
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{ 0, 1, 2, 3, 4, 5, 6, 7 }, /* 1x8 */
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{ 0, 1 }, /* 2x1 */
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{ 0, 1, 2, 3 }, /* 2x2 */
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{ 0, 1, 2, 3, 4, 5, 6, 7 }, /* 2x4 */
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{ 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7 }, /* 2x8 */
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{ 0, 1, 2, 3 }, /* 4x1 */
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{ 0, 1, 2, 3, 4, 5, 6, 7 }, /* 4x2 */
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{ 0, 1, 0, 1, 2, 3, 2, 3, 4, 5, 4, 5, 6, 7, 6, 7 }, /* 4x4 */
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{ 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, /* 4x8 */
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4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7 },
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{ 0, 1, 2, 3, 4, 5, 6, 7 }, /* 8x1 */
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{ 0, 1, 2, 3, 0, 1, 2, 3, 4, 5, 6, 7, 4, 5, 6, 7 }, /* 8x2 */
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{ 0, 1, 0, 1, 0, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 3, /* 8x4 */
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4, 5, 4, 5, 4, 5, 4, 5, 6, 7, 6, 7, 6, 7, 6, 7 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, /* 8x8 */
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2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
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4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5,
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6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7 }
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};
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/* 8-bit color magnitude by brightness level */
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static const uint8_t BRIGHT8[] = {
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0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30,
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32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62,
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64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94,
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96, 98,100,102,104,106,108,110,112,114,116,118,120,122,124,126,
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129,131,133,135,137,139,141,143,145,147,149,151,153,155,157,159,
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161,163,165,167,169,171,173,175,177,179,181,183,185,187,189,191,
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193,195,197,199,201,203,205,207,209,211,213,215,217,219,221,223,
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225,227,229,231,233,235,237,239,241,243,245,247,249,251,253,255
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};
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/*********************************** Types ***********************************/
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/* Intersection of the screen and a world rectangle */
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typedef struct {
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int32_t x1; /* Left edge inclusive */
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int32_t x2; /* Right edge exclusive */
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int32_t y1; /* Top edge inclusive */
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int32_t y2; /* Bottom edge exclusive */
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} Window;
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/***************************** Module Functions ******************************/
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/* Read a palette */
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static int32_t vipReadPalette(uint8_t *entries) {
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return entries[3] << 6 | entries[2] << 4 | entries[1] << 2;
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}
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/* Raise an interrupt request */
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static void vipThrow(VB *sim, uint16_t cause) {
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sim->vip.intpnd |= cause;
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if (sim->vip.intenb & cause)
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sim->cpu.irq |= 0x0010;
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}
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/* Write a palette */
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static void vipWritePalette(uint8_t *entries, int32_t mask, int32_t value) {
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if (mask & 0x00FF)
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return;
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entries[3] = value >> 6 & 3;
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entries[2] = value >> 4 & 3;
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entries[1] = value >> 2 & 3;
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}
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/* Read a typed value from an I/O register */
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static int32_t vipReadIO(VB *sim, uint32_t address, int type) {
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int32_t mask = 0; /* Byte access mask */
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int32_t value; /* Return value */
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/* Adjustments by type */
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switch (type) {
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case VB_S32: /* Word */
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return vipReadIO(sim, address, VB_U16) |
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(uint32_t) vipReadIO(sim, address + 2, VB_U16) << 16;
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case VB_S8: /* Byte */
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case VB_U8:
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mask = 0x00FF << ((address & 1) << 3);
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break;
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case VB_S16: /* Halfword */
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case VB_U16:
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mask = 0xFFFF;
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}
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/* Access by register */
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switch (address >> 1) {
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case 0x5F800>>1: /* INTPND */
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value = sim->vip.intpnd;
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break;
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case 0x5F802>>1: /* INTENB */
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value = sim->vip.intenb;
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break;
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case 0x5F820>>1: /* DPSTTS */
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value =
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(int32_t) sim->vip.dp.lock << 10 |
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(int32_t) sim->vip.dp.synce << 9 |
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(int32_t) sim->vip.dp.re << 8 |
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(int32_t) sim->vip.dp.fclk << 7 |
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(int32_t) sim->vip.dp.scanrdy << 6 |
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(int32_t) sim->vip.dp.r1bsy << 5 |
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(int32_t) sim->vip.dp.l1bsy << 4 |
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(int32_t) sim->vip.dp.r0bsy << 3 |
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(int32_t) sim->vip.dp.l0bsy << 2 |
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(int32_t) sim->vip.dp.disp << 1
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;
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break;
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case 0x5F824>>1: /* BRTA */
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value = sim->vip.brtRest[0];
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break;
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case 0x5F826>>1: /* BRTB */
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value = sim->vip.brtRest[1];
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break;
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case 0x5F828>>1: /* BRTC */
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value = sim->vip.brtRest[2];
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break;
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case 0x5F82A>>1: /* REST */
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value = sim->vip.brtRest[3];
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break;
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case 0x5F82E>>1: /* FRMCYC */
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value = sim->vip.frmcyc;
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break;
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case 0x5F830>>1: /* CTA */
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value = (int32_t) sim->vip.cta.cta_r << 8 | sim->vip.cta.cta_l;
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break;
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case 0x5F840>>1: /* XPSTTS */
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value =
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(int32_t) !!sim->vip.xp.sbout << 15 |
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(int32_t) sim->vip.xp.sbcount << 8 |
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(int32_t) sim->vip.xp.overtime << 4 |
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(int32_t) sim->vip.xp.f1bsy << 3 |
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(int32_t) sim->vip.xp.f0bsy << 2 |
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(int32_t) sim->vip.xp.xpen << 1
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;
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break;
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case 0x5F844>>1: /* VER */
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value = 2;
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break;
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case 0x5F848>>1: /* SPT0 */
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value = sim->vip.spt[0];
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break;
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case 0x5F84A>>1: /* SPT1 */
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value = sim->vip.spt[1];
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break;
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case 0x5F84C>>1: /* SPT2 */
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value = sim->vip.spt[2];
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break;
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case 0x5F84E>>1: /* SPT3 */
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value = sim->vip.spt[3];
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break;
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case 0x5F860>>1: /* GPLT0 */
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value = vipReadPalette(sim->vip.gplt[0]);
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break;
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case 0x5F862>>1: /* GPLT1 */
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value = vipReadPalette(sim->vip.gplt[1]);
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break;
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case 0x5F864>>1: /* GPLT2 */
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value = vipReadPalette(sim->vip.gplt[2]);
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break;
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case 0x5F866>>1: /* GPLT3 */
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value = vipReadPalette(sim->vip.gplt[3]);
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break;
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case 0x5F868>>1: /* JPLT0 */
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value = vipReadPalette(sim->vip.jplt[0]);
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break;
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case 0x5F86A>>1: /* JPLT1 */
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value = vipReadPalette(sim->vip.jplt[1]);
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break;
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case 0x5F86C>>1: /* JPLT2 */
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value = vipReadPalette(sim->vip.jplt[2]);
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break;
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case 0x5F86E>>1: /* JPLT3 */
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value = vipReadPalette(sim->vip.jplt[3]);
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break;
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case 0x5F870>>1: /* BKCOL */
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value = sim->vip.bkcol;
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break;
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/* Unmapped */
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default: value = 0;
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}
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/* Select byte bits as necessary */
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return
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mask == 0x00FF ? value & 0x00FF :
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mask == 0xFF00 ? value >> 8 :
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value;
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}
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/* Write into BG map cell memory */
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static void vipWriteCell(VB *sim, uint32_t offset, int type, int32_t value) {
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Cell *cell;
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/* Adjustments for byte and word writes */
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switch (type) {
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case VB_S8:
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case VB_U8:
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value = offset & 1 ?
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value << 8 | sim->vip.ram[0x20000 | offset] :
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value | (int32_t) sim->vip.ram[0x20001 | offset] << 8
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;
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break;
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case VB_S32:
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vipWriteCell(sim, offset + 2, VB_U16, value >> 16);
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break;
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}
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/* Update pixel pointer */
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cell = &sim->vip.cells[offset >> 1];
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cell->palette = sim->vip.gplt[value >> 14 & 3];
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cell->pixels = sim->vip.characters[value & 0x07FF][value >> 12 & 3];
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}
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/* Write into character memory */
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static void vipWriteChr(VB *sim, uint32_t offset, int type, int32_t value) {
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Character *chr; /* Pixel state */
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int b, l, r, t; /* Pixel bounds */
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int x, y, X, Y; /* Iterators */
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/* Byte advance by data type */
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static const uint8_t HORZ[] = { 4, 4, 8, 8, 8 };
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static const uint8_t VERT[] = { 8, 8, 8, 8, 16 };
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/* Working variables */
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chr = &sim->vip.characters[offset >> 4];
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l = (offset & 0x1) << 2;
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t = (offset & 0xE) << 2;
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r = l + HORZ[type];
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b = t + VERT[type];
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/* Process all pixels */
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for (y = t, Y = 56 - y; y < b; y += 8, Y -= 8)
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for (x = l, X = 7 - x; x < r; x += 1, X -= 1, value >>= 2) {
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(*chr)[0][y | x] = (*chr)[1][Y | x] =
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(*chr)[2][y | X] = (*chr)[3][Y | X] = value & 3;
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}
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}
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/* Write into object attribute memory */
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static void vipWriteObject(VB *sim, uint32_t offset, int type, int32_t value) {
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Object *obj; /* Object state */
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/* Adjustments for byte and word writes */
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switch (type) {
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case VB_S8:
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case VB_U8:
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value = offset & 1 ?
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value << 8 | sim->vip.ram[0x3E000 | offset] :
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value | (int32_t) sim->vip.ram[0x3E001 | offset] << 8
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;
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break;
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case VB_S32:
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vipWriteObject(sim, offset + 2, VB_U16, value >> 16);
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break;
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}
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/* Processing by offset */
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obj = &sim->vip.objects[offset >> 3];
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switch (offset >> 1 & 3) {
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case 0: obj->jx = SignExtend(value, 10); break;
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case 1:
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obj->jp = SignExtend(value, 10);
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obj->lron = value >> 14 & 3;
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break;
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case 2:
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value = (int8_t) value;
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obj->jy = value > -8 ? value : value & 0xFF;
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break;
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case 3:
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obj->cell.palette = sim->vip.jplt[value >> 14 & 3];
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obj->cell.pixels =
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sim->vip.characters[value & 0x07FF][value >> 12 & 3];
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}
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}
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/* Write into world attribute memory */
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static void vipWriteWorld(VB *sim, uint32_t offset, int type, int32_t value) {
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uint32_t base; /* Base BG map index */
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uint8_t *bg; /* Background template */
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uint32_t count; /* Number of BG maps in background */
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World *world; /* World state */
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uint32_t z; /* Iterator */
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/* Adjustments for byte and word writes */
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switch (type) {
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case VB_S8:
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case VB_U8:
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value = offset & 1 ?
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value << 8 | sim->vip.ram[0x3D800 | offset] :
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value | (int32_t) sim->vip.ram[0x3D801 | offset] << 8
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;
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break;
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case VB_S32:
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vipWriteWorld(sim, offset + 2, VB_U16, value >> 16);
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break;
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}
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/* Processing by offset */
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world = &sim->vip.worlds[offset >> 5];
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switch (offset >> 1 & 15) {
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case 0:
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/* Parse attributes */
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world->lron = value >> 14 & 3;
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world->bgm = value >> 12 & 3;
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world->over = value >> 7 & 1;
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world->end = value >> 6 & 1;
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/* Update background fields */
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z = value >> 10 & 3;
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world->bgMaskX = (1 << z) - 1;
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world->bgWidth = 512 << z;
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world->bgShift = z;
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z = value >> 8 & 3;
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world->bgMaskY = (1 << z) - 1;
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world->bgHeight = 512 << z;
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/* Update world dimensions */
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if (world->bgm != 2) {
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world->height = world->hNaffine;
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world->width = world->wNaffine;
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} else {
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world->height = world->hAffine;
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world->width = world->wAffine;
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}
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/* Update background arrangement */
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count = (world->bgMaskX + 1) * (world->bgMaskY + 1);
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base = value & 15 & ~(count > 8 ? 7 : count - 1);
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bg = (uint8_t *) BG_TEMPLATES[value >> 8 & 15];
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for (z = 0; z < count; z++)
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world->bg[z] = &sim->vip.cells[(base + bg[z]) << 12];
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break;
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case 1: world->gx = SignExtend(value, 10); break;
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case 2: world->gp = SignExtend(value, 10); break;
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case 3: world->gy = (int16_t) value; break;
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case 4: world->mx = SignExtend(value, 13); break;
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case 5: world->mp = SignExtend(value, 15); break;
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case 6: world->my = SignExtend(value, 13); break;
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case 7: /* W */
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value = SignExtend(value, 13) + 1;
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world->wNaffine = value < 0 ? 0 : value;
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value = SignExtend(value, 10) + 1;
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world->wAffine = value < 0 ? 0 : value;
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world->width = world->bgm != 2 ? world->wNaffine : world->wAffine;
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break;
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case 8: /* H */
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value = (int16_t) value + 1;
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world->hNaffine = value < 8 ? 8 : value;
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world->hAffine = value < 0 ? 0 : value;
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world->height = world->bgm != 2 ? world->hNaffine : world->hAffine;
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break;
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case 9: world->paramBase = 0x20000|(uint32_t)(uint16_t)value<<1;break;
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case 10: world->overplane = &sim->vip.cells[(uint16_t) value]; break;
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}
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}
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/* Write a typed value to an I/O register */
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static void vipWriteIO(
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VB *sim, uint32_t address, int type, int32_t value, int debug) {
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int32_t mask; /* Byte access mask */
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/* Adjustments by type */
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switch (type) {
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case VB_S32: /* Word */
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vipWriteIO(sim, address , VB_U16, value , debug);
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vipWriteIO(sim, address + 2, VB_U16, value >> 16, debug);
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return;
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case VB_S8: /* Byte */
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case VB_U8:
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/* Select which half of the register to access */
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if (debug) {
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mask = (address & 1) << 3;
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value = (value & 0x00FF) << mask;
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mask = 0xFF00 >> mask;
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break;
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}
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/* Convert to a halfword access */
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if ((address & 1) != 0)
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value = (value & 0x00FF) << 8;
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/* Fallthrough */
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default: /* Halfword */
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mask = 0x0000;
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}
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/* Access by register */
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switch (address >> 1) {
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case 0x5F802>>1: /* INTENB */
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sim->vip.intenb = (sim->vip.intenb & mask) | (value & 0xE01F);
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break;
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case 0x5F804>>1: /* INTCLR */
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sim->vip.intpnd &= ~value;
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if ((sim->vip.intpnd & sim->vip.intenb) == 0)
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sim->cpu.irq &= ~0x0010;
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break;
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case 0x5F822>>1: /* DPCTRL */
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if ((mask & 0xFF00) == 0) {
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sim->vip.dp.lock = value >> 10 & 1;
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sim->vip.dp.synce = value >> 9 & 1;
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sim->vip.dp.re = value >> 8 & 1;
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}
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if ((mask & 0x00FF) == 0) {
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sim->vip.dp.disp = value >> 1 & 1;
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/* DPRST */
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if (value & 1) {
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sim->vip.intenb &= ~0x801F;
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sim->vip.intpnd &= ~0x801F;
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if ((sim->vip.intpnd & sim->vip.intenb) == 0)
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sim->cpu.irq &= ~0x0010;
|
|
/* TODO: Research exact operation */
|
|
}
|
|
|
|
}
|
|
break;
|
|
|
|
case 0x5F824>>1: /* BRTA */
|
|
sim->vip.brtRest[0] = (sim->vip.brtRest[0] & mask) | value;
|
|
break;
|
|
case 0x5F826>>1: /* BRTB */
|
|
sim->vip.brtRest[1] = (sim->vip.brtRest[1] & mask) | value;
|
|
break;
|
|
case 0x5F828>>1: /* BRTC */
|
|
sim->vip.brtRest[2] = (sim->vip.brtRest[2] & mask) | value;
|
|
break;
|
|
case 0x5F82A>>1: /* REST */
|
|
sim->vip.brtRest[3] = (sim->vip.brtRest[3] & mask) | value;
|
|
break;
|
|
|
|
case 0x5F82E>>1: /* FRMCYC */
|
|
sim->vip.frmcyc = (sim->vip.frmcyc & mask) | (value & 15);
|
|
break;
|
|
|
|
case 0x5F830>>1: /* CTA */
|
|
if ((mask & 0xFF00) == 0)
|
|
sim->vip.cta.cta_r = value >> 8;
|
|
if ((mask & 0x00FF) == 0)
|
|
sim->vip.cta.cta_l = value;
|
|
break;
|
|
|
|
case 0x5F842>>1: /* XPCTRL */
|
|
if ((mask & 0xFF00) == 0)
|
|
sim->vip.xp.sbcmp = value >> 8 & 31;
|
|
if ((mask & 0x00FF) == 0) {
|
|
sim->vip.xp.xpen = value >> 1 & 1;
|
|
|
|
/* XPRST */
|
|
if (value & 1) {
|
|
sim->vip.intenb &= ~0xE000;
|
|
sim->vip.intpnd &= ~0xE000;
|
|
if ((sim->vip.intpnd & sim->vip.intenb) == 0)
|
|
sim->cpu.irq &= ~0x0010;
|
|
/* TODO: Research exact operation */
|
|
}
|
|
|
|
}
|
|
break;
|
|
|
|
case 0x5F848>>1: /* SPT0 */
|
|
sim->vip.spt[0] = (sim->vip.spt[0]&mask) | (value&0x03FF&~mask);
|
|
break;
|
|
case 0x5F84A>>1: /* SPT1 */
|
|
sim->vip.spt[1] = (sim->vip.spt[1]&mask) | (value&0x03FF&~mask);
|
|
break;
|
|
case 0x5F84C>>1: /* SPT2 */
|
|
sim->vip.spt[2] = (sim->vip.spt[2]&mask) | (value&0x03FF&~mask);
|
|
break;
|
|
case 0x5F84E>>1: /* SPT3 */
|
|
sim->vip.spt[3] = (sim->vip.spt[3]&mask) | (value&0x03FF&~mask);
|
|
break;
|
|
|
|
case 0x5F860>>1: /* GPLT0 */
|
|
vipWritePalette(sim->vip.gplt[0], mask, value);
|
|
break;
|
|
case 0x5F862>>1: /* GPLT1 */
|
|
vipWritePalette(sim->vip.gplt[1], mask, value);
|
|
break;
|
|
case 0x5F864>>1: /* GPLT2 */
|
|
vipWritePalette(sim->vip.gplt[2], mask, value);
|
|
break;
|
|
case 0x5F866>>1: /* GPLT3 */
|
|
vipWritePalette(sim->vip.gplt[3], mask, value);
|
|
break;
|
|
case 0x5F868>>1: /* JPLT0 */
|
|
vipWritePalette(sim->vip.jplt[0], mask, value);
|
|
break;
|
|
case 0x5F86A>>1: /* JPLT1 */
|
|
vipWritePalette(sim->vip.jplt[1], mask, value);
|
|
break;
|
|
case 0x5F86C>>1: /* JPLT2 */
|
|
vipWritePalette(sim->vip.jplt[2], mask, value);
|
|
break;
|
|
case 0x5F86E>>1: /* JPLT3 */
|
|
vipWritePalette(sim->vip.jplt[3], mask, value);
|
|
break;
|
|
|
|
case 0x5F870>>1: /* BKCOL */
|
|
sim->vip.bkcol = (sim->vip.bkcol & mask) | (value & 3 * ~mask);
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/***************************** Callback Handlers *****************************/
|
|
|
|
/* Prepare to handle an exception */
|
|
#ifndef VB_DIRECT_FRAME
|
|
#define VB_ON_FRAME sim->onFrame
|
|
#else
|
|
extern int VB_DIRECT_FRAME(VB *);
|
|
#define VB_ON_FRAME VB_DIRECT_FRAME
|
|
#endif
|
|
static int vipOnFrame(VB *sim) {
|
|
return sim->onFrame != NULL && VB_ON_FRAME(sim);
|
|
}
|
|
#undef VB_ON_FRAME
|
|
|
|
|
|
|
|
/***************************** Display Processor *****************************/
|
|
|
|
/* Precompute brightness values for image output */
|
|
static void vipComputeBrightness(VB *sim) {
|
|
int32_t brt[4]; /* Working output */
|
|
int32_t repeat; /* Multiplier from column table */
|
|
int x; /* Iterator */
|
|
|
|
/* Compute brightness from hardware state */
|
|
repeat = (int32_t) sim->vip.ram[sim->vip.dp.cta + 1] + 1;
|
|
brt[1] = repeat * sim->vip.brtRest[0];
|
|
brt[2] = repeat * sim->vip.brtRest[1];
|
|
brt[3] = repeat * sim->vip.brtRest[2] + brt[2] + brt[1];
|
|
|
|
/* Transform brightness values to 0..255 */
|
|
for (x = 1; x < 4; x++)
|
|
sim->vip.dp.brt[x] = brt[x] > 127 ? 255 : BRIGHT8[brt[x]];
|
|
}
|
|
|
|
/* Transfer one column of frame buffer pixels to output */
|
|
static void vipTransferColumn(VB *sim, int32_t eye) {
|
|
int32_t bits; /* Pixel bits from frame buffer */
|
|
uint8_t *dest; /* Host frame image output */
|
|
uint8_t *src; /* Simulation frame buffer input */
|
|
int y, z; /* Iterators */
|
|
|
|
/* Select destination address in host memory */
|
|
dest = &sim->vip.output
|
|
[sim->vip.dp.buffer][eye][sim->vip.dp.column];
|
|
|
|
/* Output is disabled */
|
|
if (!sim->vip.dp.enabled) {
|
|
for (y = 0; y < 224; y += 16)
|
|
for (z = 0; z < 16; z++, dest += 384)
|
|
*dest = 0;
|
|
return;
|
|
}
|
|
|
|
/* Select source address in host memory */
|
|
src = &sim->vip.ram[
|
|
eye << 16 |
|
|
sim->vip.dp.buffer << 15 |
|
|
sim->vip.dp.column << 6
|
|
];
|
|
|
|
/* Transfer all rows as words */
|
|
for (y = 0; y < 224; y += 16, src += 4) {
|
|
bits = busReadBuffer(src, VB_S32);
|
|
for (z = 0; z < 16; bits >>= 2, z++, dest += 384)
|
|
*dest = sim->vip.dp.brt[bits & 3];
|
|
}
|
|
|
|
}
|
|
|
|
/* Process sub-component */
|
|
static int vipEmulateDisplay(VB *sim, uint32_t clocks) {
|
|
|
|
/* Process all clocks */
|
|
for (;;) {
|
|
|
|
/* The next event is after the time remaining */
|
|
if (sim->vip.dp.clocks > clocks) {
|
|
sim->vip.dp.clocks -= clocks;
|
|
sim->vip.dp.until -= clocks;
|
|
return 0;
|
|
}
|
|
|
|
/* Advance forward the component's number of clocks */
|
|
clocks -= sim->vip.dp.clocks;
|
|
sim->vip.dp.until -= sim->vip.dp.clocks;
|
|
sim->vip.dp.clocks = 0;
|
|
|
|
/* Processing by operation phase */
|
|
switch (sim->vip.dp.step) {
|
|
|
|
case 0: /* 0ms - FCLK rising edge */
|
|
sim->vip.dp.clocks = vipClocksMs(3);
|
|
sim->vip.dp.enabled = sim->vip.dp.disp & sim->vip.dp.synce;
|
|
sim->vip.dp.fclk = 1;
|
|
sim->vip.dp.step = 1;
|
|
sim->vip.dp.until = vipClocksMs(8);
|
|
vipThrow(sim, 0x0010); /* FRAMESTART */
|
|
|
|
/* Game frame */
|
|
if (sim->vip.xp.xpen) {
|
|
if (sim->vip.xp.frame >= sim->vip.frmcyc) {
|
|
sim->vip.xp.frame = 0;
|
|
|
|
/* Initiate drawing procedure */
|
|
if (sim->vip.xp.step == 0) {
|
|
sim->vip.dp.buffer ^= 1;
|
|
sim->vip.xp.enabled = 1;
|
|
sim->vip.xp.overtime = 0;
|
|
sim->vip.xp.step = 1;
|
|
vipThrow(sim, 0x0008); /* GAMESTART */
|
|
}
|
|
|
|
/* Drawing procedure has run into overtime */
|
|
else {
|
|
sim->vip.xp.overtime = 1;
|
|
vipThrow(sim, 0x8000); /* TIMEERR */
|
|
}
|
|
|
|
} else sim->vip.xp.frame++;
|
|
}
|
|
|
|
break;
|
|
|
|
/* 0ms-3ms - Idle */
|
|
|
|
case 1: /* 3ms - L*BSY rising edge */
|
|
if (sim->vip.dp.enabled) {
|
|
if (sim->vip.dp.buffer == 0)
|
|
sim->vip.dp.l0bsy = 1;
|
|
else sim->vip.dp.l1bsy = 1;
|
|
}
|
|
sim->vip.dp.column = 0;
|
|
sim->vip.dp.cta = 0x3DC00 | (uint32_t)sim->vip.cta.cta_l<<1;
|
|
sim->vip.dp.step = 2;
|
|
vipComputeBrightness(sim);
|
|
|
|
/* Fallthrough */
|
|
case 2: /* 3ms-8ms - Display left frame buffer */
|
|
if ((sim->vip.dp.column & 3) == 0)
|
|
vipComputeBrightness(sim);
|
|
vipTransferColumn(sim, 0);
|
|
sim->vip.dp.clocks =
|
|
260 + (0xA94 >> sim->vip.dp.column % 12 & 1);
|
|
sim->vip.dp.column++;
|
|
if ((sim->vip.dp.column & 3) == 0)
|
|
sim->vip.dp.cta -= 2;
|
|
if (sim->vip.dp.column == 384)
|
|
sim->vip.dp.step = 3;
|
|
break;
|
|
|
|
case 3: /* 8ms - L*BSY falling edge */
|
|
if (sim->vip.dp.enabled) {
|
|
if (sim->vip.dp.buffer == 0)
|
|
sim->vip.dp.l0bsy = 0;
|
|
else sim->vip.dp.l1bsy = 0;
|
|
vipThrow(sim, 0x0002); /* LFBEND */
|
|
}
|
|
sim->vip.dp.clocks = vipClocksMs(2);
|
|
sim->vip.dp.step = 4;
|
|
sim->vip.dp.until = vipClocksMs(10);
|
|
break;
|
|
|
|
/* 8ms-10ms - Idle */
|
|
|
|
case 4: /* 10ms - FCLK falling edge */
|
|
sim->vip.dp.clocks = vipClocksMs(3);
|
|
sim->vip.dp.fclk = 0;
|
|
sim->vip.dp.step = 5;
|
|
break;
|
|
|
|
/* 10ms-13ms - Idle */
|
|
|
|
case 5: /* 13ms - R*BSY rising edge */
|
|
if (sim->vip.dp.enabled) {
|
|
if (sim->vip.dp.buffer == 0)
|
|
sim->vip.dp.r0bsy = 1;
|
|
else sim->vip.dp.r1bsy = 1;
|
|
}
|
|
sim->vip.dp.column = 0;
|
|
sim->vip.dp.cta = 0x3DE00 | (uint32_t)sim->vip.cta.cta_r<<1;
|
|
sim->vip.dp.step = 6;
|
|
|
|
/* Fallthrough */
|
|
case 6: /* 13ms-18ms - Display right frame buffer */
|
|
if ((sim->vip.dp.column & 3) == 0)
|
|
vipComputeBrightness(sim);
|
|
vipTransferColumn(sim, 1);
|
|
sim->vip.dp.clocks =
|
|
260 + (0xA94 >> sim->vip.dp.column % 12 & 1);
|
|
sim->vip.dp.column++;
|
|
if ((sim->vip.dp.column & 3) == 0)
|
|
sim->vip.dp.cta -= 2;
|
|
if (sim->vip.dp.column == 384)
|
|
sim->vip.dp.step = 7;
|
|
break;
|
|
|
|
case 7: /* 18ms - R*BSY falling edge */
|
|
if (sim->vip.dp.enabled) {
|
|
if (sim->vip.dp.buffer == 0)
|
|
sim->vip.dp.r0bsy = 0;
|
|
else sim->vip.dp.r1bsy = 0;
|
|
vipThrow(sim, 0x0004); /* RFBEND */
|
|
}
|
|
sim->vip.dp.clocks = vipClocksMs(2);
|
|
sim->vip.dp.enabled = 0;
|
|
sim->vip.dp.step = 8;
|
|
sim->vip.dp.until = vipClocksMs(2);
|
|
break;
|
|
|
|
/* 18ms-20ms - Idle */
|
|
|
|
case 8: /* 20ms - Display interval complete */
|
|
sim->vip.dp.step = 0;
|
|
if (vipOnFrame(sim))
|
|
return 1;
|
|
break;
|
|
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/****************************** Pixel Processor ******************************/
|
|
|
|
/* Draw a cell into shadow memory */
|
|
static void vipDrawCell(uint8_t *shadow, Window *wnd,
|
|
Cell *cell, int32_t x, int32_t y) {
|
|
uint8_t *col, *row; /* Output pixel */
|
|
uint8_t pixel; /* Character pixel value */
|
|
int32_t px1, px2, py1, py2; /* Pixel bounds in cell */
|
|
int32_t px, py; /* Pixel origin in cell */
|
|
|
|
/* Identify the visible pixels */
|
|
py1 = y > wnd->y1 ? y : wnd->y1;
|
|
py2 = y + 8 < wnd->y2 ? y + 8 : wnd->y2;
|
|
px1 = x > wnd->x1 ? x : wnd->x1;
|
|
px2 = x + 8 < wnd->x2 ? x + 8 : wnd->x2;
|
|
|
|
/* Process all columns of pixels */
|
|
col = &shadow[px1 * 224 + py1];
|
|
for (px = px1; px < px2; px++, col += 224)
|
|
for (py = py1, row = col; py < py2; py++, row++) {
|
|
pixel = cell->pixels[(py - y) << 3 | (px - x)];
|
|
if (pixel != 0)
|
|
*row = cell->palette[pixel];
|
|
}
|
|
|
|
}
|
|
|
|
/* Draw a BG map into shadow memory */
|
|
static void vipDrawBGMap(uint8_t *shadow, Window *wnd,
|
|
uint8_t over, Cell *map, int32_t x, int32_t y) {
|
|
Cell *col, *row; /* Source cell */
|
|
int32_t cx1, cx2, cy1, cy2; /* Cell bounds in BG map pixels */
|
|
int32_t cx, cy; /* Cell origin in BG map pixels */
|
|
|
|
/* Identify the visible cells */
|
|
cy1 = (wnd->y1-y ) & ~7; if (cy1 < 0) cy1 = 0; if (cy1 > 512) cy1 = 512;
|
|
cy2 = (wnd->y2-y+7) & ~7; if (cy2 < 0) cy2 = 0; if (cy2 > 512) cy2 = 512;
|
|
cx1 = (wnd->x1-x ) & ~7; if (cx1 < 0) cx1 = 0; if (cx1 > 512) cx1 = 512;
|
|
cx2 = (wnd->x2-x+7) & ~7; if (cx2 < 0) cx2 = 0; if (cx2 > 512) cx2 = 512;
|
|
|
|
/* Process all cells as overplane */
|
|
if (over) {
|
|
for (cy = cy1; cy < cy2; cy += 8)
|
|
for (cx = cx1; cx < cx2; cx += 8)
|
|
vipDrawCell(shadow, wnd, map, x + cx, y + cy);
|
|
return;
|
|
}
|
|
|
|
/* Process all cells normally */
|
|
row = &map[cy1 << 3 | cx1 >> 3];
|
|
for (cy = cy1 ; cy < cy2; cy += 8, row += 64)
|
|
for (cx = cx1, col = row; cx < cx2; cx += 8, col++)
|
|
vipDrawCell(shadow, wnd, col, x + cx, y + cy);
|
|
}
|
|
|
|
/* Draw a background into shadow memory */
|
|
static void vipDrawBackground(uint8_t *shadow, Window *wnd,
|
|
World *world, int32_t x, int32_t y) {
|
|
int32_t bx1, bx2, by1, by2; /* BG map bounds in background pixels */
|
|
int32_t bx, by; /* BG map origin in background pixels */
|
|
|
|
/* Identify the visible BG maps */
|
|
by1 = (wnd->y1 - y ) & ~511;
|
|
by2 = (wnd->y2 - y - 1) & ~511;
|
|
bx1 = (wnd->x1 - x ) & ~511;
|
|
bx2 = (wnd->x2 - x - 1) & ~511;
|
|
|
|
/* Process all rows of BG maps */
|
|
for (by = by1; by <= by2; by += 512) {
|
|
|
|
/* Row is out of bounds */
|
|
if (world->over && (by < 0 || by >= world->bgHeight)) {
|
|
for (bx = bx1; bx <= bx2; bx++)
|
|
vipDrawBGMap(shadow, wnd, 1, world->overplane, x + bx, y + by);
|
|
continue;
|
|
}
|
|
|
|
/* Process all columns of BG maps */
|
|
for (bx = bx1; bx <= bx2; bx += 512) {
|
|
|
|
/* Column is out of bounds */
|
|
if (world->over && (bx < 0 || bx >= world->bgWidth)) {
|
|
vipDrawBGMap(shadow, wnd, 1, world->overplane, x + bx, y + by);
|
|
continue;
|
|
}
|
|
|
|
/* Column is in bounds */
|
|
vipDrawBGMap(shadow, wnd, 0, world->bg[
|
|
(by >> 9 & world->bgMaskY) << world->bgShift |
|
|
(bx >> 9 & world->bgMaskX)
|
|
], x + bx, y + by);
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* Draw a Normal world into shadow memory */
|
|
static void vipDrawNormal(VB *sim, World *world) {
|
|
int32_t mx, my; /* Background origin */
|
|
Window wnd; /* Window bounds in pixels */
|
|
int i; /* Iterator */
|
|
|
|
/* No visible content */
|
|
if (world->width == 0)
|
|
return;
|
|
|
|
/* Vertical window bounds */
|
|
wnd.y1 = (int32_t) sim->vip.xp.sbcount << 3;
|
|
if (world->gy > wnd.y1)
|
|
wnd.y1 = world->gy;
|
|
if (wnd.y1 >= 224)
|
|
return;
|
|
wnd.y2 = wnd.y1 + world->height;
|
|
if (wnd.y2 <= 0)
|
|
return;
|
|
my = wnd.y1 - world->my;
|
|
if (wnd.y1 < 0)
|
|
wnd.y1 = 0;
|
|
if (wnd.y2 > 224)
|
|
wnd.y2 = 224;
|
|
|
|
/* Process both eyes */
|
|
for (i = 0; i < 2; i++) {
|
|
|
|
/* Check visibility */
|
|
if (!(world->lron >> (i ^ 1) & 1))
|
|
continue;
|
|
|
|
/* Horizontal window bounds */
|
|
wnd.x1 = world->gx + (i == 0 ? -world->gp : world->gp);
|
|
if (wnd.x1 >= 384)
|
|
continue;
|
|
wnd.x2 = wnd.x1 + world->width;
|
|
if (wnd.x2 <= 0)
|
|
continue;
|
|
mx = wnd.x1 - world->mx - (i == 0 ? -world->mp : world->mp);
|
|
if (wnd.x1 < 0)
|
|
wnd.x1 = 0;
|
|
if (wnd.x2 > 384)
|
|
wnd.x2 = 384;
|
|
|
|
/* Draw the background into the window */
|
|
vipDrawBackground(sim->vip.shadow[i], &wnd, world, mx, my);
|
|
}
|
|
|
|
}
|
|
|
|
/* Draw an H-bias world into shadow memory */
|
|
static void vipDrawHBias(VB *sim, World *world) {
|
|
int32_t mx, my; /* Background origin */
|
|
uint8_t *param; /* World parameter memory */
|
|
Window wnd; /* Window bounds in pixels */
|
|
int32_t y1, y2; /* Vertical window bounds */
|
|
int i, y; /* Iterators */
|
|
|
|
/* No visible content */
|
|
if (world->width == 0)
|
|
return;
|
|
|
|
/* Vertical window bounds */
|
|
y1 = (int32_t) sim->vip.xp.sbcount << 3;
|
|
if (world->gy > y1)
|
|
y1 = world->gy;
|
|
if (y1 >= 224)
|
|
return;
|
|
y2 = y1 + world->height;
|
|
if (y2 <= 0)
|
|
return;
|
|
my = y1 - world->my;
|
|
if (y1 < 0)
|
|
y1 = 0;
|
|
if (y2 > 224)
|
|
y2 = 224;
|
|
|
|
/* Process both eyes */
|
|
for (i = 0; i < 2; i++) {
|
|
|
|
/* Check visibility */
|
|
if (!(world->lron >> (i ^ 1) & 1))
|
|
continue;
|
|
|
|
/* Horizontal window bounds */
|
|
wnd.x1 = world->gx + (i == 0 ? -world->gp : world->gp);
|
|
if (wnd.x1 >= 384)
|
|
continue;
|
|
wnd.x2 = wnd.x1 + world->width;
|
|
if (wnd.x2 <= 0)
|
|
continue;
|
|
mx = wnd.x1 - world->mx - (i == 0 ? -world->mp : world->mp);
|
|
if (wnd.x1 < 0)
|
|
wnd.x1 = 0;
|
|
if (wnd.x2 > 384)
|
|
wnd.x2 = 384;
|
|
|
|
/* Process all visible lines */
|
|
param = &sim->vip.ram[world->paramBase +
|
|
((y1 - world->gy) << 2) + (i << 1)];
|
|
for (y = y1; y < y2; y++, param += 2) {
|
|
|
|
/* Configure window bounds */
|
|
wnd.y1 = y;
|
|
wnd.y2 = y + 1;
|
|
|
|
/* Draw the background into the window */
|
|
vipDrawBackground(sim->vip.shadow[i], &wnd, world,
|
|
mx + busReadBuffer(param, VB_S16), my);
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* Draw an Affine world into shadow memory */
|
|
static void vipDrawAffine(VB *sim, World *world) {
|
|
Cell *cell; /* Source cell */
|
|
uint8_t *col, *row; /* Output pixel */
|
|
uint8_t pixel; /* Character pixel value */
|
|
uint8_t *param; /* World parameter memory */
|
|
int32_t px, py; /* Pixel source coordinates */
|
|
int32_t dx, dy, mp, mx, my; /* Affine parameters */
|
|
int32_t wx; /* Base world X coordinate */
|
|
int32_t x1, x2, y1, y2; /* Window bounds */
|
|
int i, x, y; /* Iterators */
|
|
|
|
/* No visible content */
|
|
if (world->width == 0 || world->height == 0)
|
|
return;
|
|
|
|
/* Vertical window bounds */
|
|
y1 = (int32_t) sim->vip.xp.sbcount << 3;
|
|
if (world->gy > y1)
|
|
y1 = world->gy;
|
|
if (y1 >= 224)
|
|
return;
|
|
y2 = y1 + world->height;
|
|
if (y2 <= 0)
|
|
return;
|
|
if (y1 < 0)
|
|
y1 = 0;
|
|
if (y2 > 224)
|
|
y2 = 224;
|
|
|
|
/* Process both eyes */
|
|
for (i = 0; i < 2; i++) {
|
|
|
|
/* Check visibility */
|
|
if (!(world->lron >> (i ^ 1) & 1))
|
|
continue;
|
|
|
|
/* Horizontal window bounds */
|
|
x1 = world->gx + (i == 0 ? -world->gp : world->gp);
|
|
if (x1 >= 384)
|
|
continue;
|
|
x2 = x1 + world->width;
|
|
if (x2 <= 0)
|
|
continue;
|
|
wx = x1;
|
|
if (x1 < 0)
|
|
x1 = 0;
|
|
if (x2 > 384)
|
|
x2 = 384;
|
|
wx = x1 - wx;
|
|
|
|
/* Process all visible rows */
|
|
param = &sim->vip.ram[world->paramBase | (y1 - world->gy) << 4];
|
|
row = &sim->vip.shadow[i][x1 * 224 + y1];
|
|
for (y = y1; y < y2; y++, param += 16, row++) {
|
|
|
|
/* Parse line parameters */
|
|
mx = (int32_t) busReadBuffer(param + 0, VB_S16) << 6;
|
|
mp = (int32_t) busReadBuffer(param + 2, VB_S16);
|
|
my = (int32_t) busReadBuffer(param + 4, VB_S16) << 6;
|
|
dx = (int32_t) busReadBuffer(param + 6, VB_S16);
|
|
dy = (int32_t) busReadBuffer(param + 8, VB_S16);
|
|
|
|
/* Adjust left-edge parameters */
|
|
if ((mp < 0) ^ i) {
|
|
mx += dx * (wx - mp);
|
|
my += dy * (wx - mp);
|
|
} else {
|
|
mx += dx * wx;
|
|
my += dy * wx;
|
|
}
|
|
|
|
/* Process all visible columns */
|
|
col = row;
|
|
for (x = x1; x < x2; x++, mx += dx, my += dy, col += 224) {
|
|
px = (int16_t) (mx >> 9);
|
|
py = (int16_t) (my >> 9);
|
|
|
|
/* Overplane */
|
|
if (world->over && (
|
|
px < 0 || px >= world->bgWidth ||
|
|
py < 0 || py >= world->bgHeight
|
|
)) cell = world->overplane;
|
|
|
|
/* Regular */
|
|
else cell = &world->bg[
|
|
(py >> 9 & world->bgMaskY) << world->bgShift |
|
|
(px >> 9 & world->bgMaskX)
|
|
][(py << 3 & 0xFC0) | (px >> 3 & 63)];
|
|
|
|
/* Sample the pixel */
|
|
pixel = cell->pixels[(py & 7) << 3 | (px & 7)];
|
|
if (pixel != 0)
|
|
*col = cell->palette[pixel];
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
/* Draw an object group into shadow memory */
|
|
static void vipDrawObjects(VB *sim, int group) {
|
|
Object *obj; /* Object state */
|
|
int start; /* First object in the group */
|
|
int stop; /* Last object in the group */
|
|
Window wnd; /* Window bounds in pixels */
|
|
int i, o; /* Iterators */
|
|
|
|
/* Establish the viewing window */
|
|
wnd.x1 = 0;
|
|
wnd.y1 = (int32_t) sim->vip.xp.sbcount << 3;
|
|
wnd.x2 = 384;
|
|
wnd.y2 = 224;
|
|
|
|
/* Process all objects in the group */
|
|
start = group == 0 ? 0 : (sim->vip.spt[group - 1] + 1) & 1023;
|
|
stop = sim->vip.spt[group];
|
|
for (o = stop; o != -1; o = o == start ? -1 : (o - 1) & 1023) {
|
|
obj = &sim->vip.objects[o];
|
|
for (i = 0; i < 2; i++) {
|
|
if (!(obj->lron >> (i ^ 1) & 1))
|
|
continue;
|
|
vipDrawCell(sim->vip.shadow[i], &wnd, &obj->cell,
|
|
obj->jx + (i == 0 ? -obj->jp : obj->jp), obj->jy);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/* Draw the current graphics configuration into shadow memory */
|
|
static void vipRender(VB *sim) {
|
|
int group; /* Next object group index */
|
|
uint16_t *timing; /* Column timing in host memory */
|
|
World *world; /* World attribute source in host memory */
|
|
int32_t x, y; /* Iterators */
|
|
|
|
/* Erase all pixels */
|
|
for (x = 0; x < 384*224; x += 224)
|
|
for (y = (int32_t) sim->vip.xp.sbcount << 3; y < 224; y++)
|
|
sim->vip.shadow[0][x + y] = sim->vip.shadow[1][x + y] = sim->vip.bkcol;
|
|
|
|
/* Process all worlds */
|
|
group = 3;
|
|
for (x = 31; x >= 0; x--) {
|
|
world = &sim->vip.worlds[x];
|
|
|
|
/* Non-graphical world */
|
|
if (world->end)
|
|
break; /* Control world */
|
|
if (world->lron == 0)
|
|
continue; /* Dummy world */
|
|
|
|
/* Processing by world type */
|
|
switch (world->bgm) {
|
|
case 0: vipDrawNormal(sim, world); break;
|
|
case 1: vipDrawHBias (sim, world); break;
|
|
case 2: vipDrawAffine(sim, world); break;
|
|
case 3:
|
|
vipDrawObjects(sim, group);
|
|
group = (group - 1) & 3;
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
Supply filler timings for each group of 8 rows of pixels
|
|
Using 2.8ms experimental measurement for empty frame
|
|
= 125 clocks every 24 halfwords
|
|
*/
|
|
timing = &sim->vip.halfwords[(uint32_t) sim->vip.xp.sbcount * 384];
|
|
x = sim->vip.xp.column;
|
|
for (y = sim->vip.xp.sbcount; y < 28; y++, x = 0)
|
|
for (; x < 384; x++, timing++)
|
|
*timing = 5 + ((uint32_t) 0x210884 >> x % 24 & 1);
|
|
}
|
|
|
|
/* Transfer one halfword from shadow pixel memory to the frame buffer */
|
|
static void vipTransferHalfword(VB *sim) {
|
|
uint32_t bits0; /* Upper 4 pixels from shadow memory */
|
|
uint32_t bits1; /* Lower 4 pixels from shadow memory */
|
|
uint8_t *dest; /* Pointer to frame buffer data in host memory */
|
|
uint32_t offset; /* Position of halfword in shadow memory */
|
|
uint8_t *src; /* Pointer to pixel data in host memory */
|
|
int i; /* Iterator */
|
|
|
|
/* Determine the output address in frame buffer memory */
|
|
dest = &sim->vip.ram[
|
|
(uint32_t) (sim->vip.dp.buffer ^ 1) << 15 |
|
|
(uint32_t) sim->vip.xp.column << 6 |
|
|
(uint32_t) sim->vip.xp.sbcount << 1
|
|
];
|
|
|
|
/* Transfer halfwords to each eye's frame buffer */
|
|
offset = (uint32_t) sim->vip.xp.column * 224 +
|
|
((uint32_t) sim->vip.xp.sbcount << 3);
|
|
for (i = 0; i < 2; i++, dest += 0x10000) {
|
|
src = &sim->vip.shadow[i][offset];
|
|
bits0 = busReadBuffer(src , VB_S32);
|
|
bits1 = busReadBuffer(src + 4, VB_S32);
|
|
busWriteBuffer(dest, VB_U16,
|
|
(bits0 & 0x0003) |
|
|
(bits0 >> 6 & 0x000C) |
|
|
(bits0 >> 12 & 0x0030) |
|
|
(bits0 >> 18 & 0x00C0) |
|
|
(bits1 << 8 & 0x0300) |
|
|
(bits1 << 2 & 0x0C00) |
|
|
(bits1 >> 4 & 0x3000) |
|
|
(bits1 >> 10 & 0xC000)
|
|
);
|
|
}
|
|
|
|
}
|
|
|
|
/* Process sub-component */
|
|
static void vipEmulateDrawing(VB *sim, uint32_t clocks) {
|
|
|
|
/* Process all clocks */
|
|
for (;;) {
|
|
|
|
/* The next event is after the time remaining */
|
|
if (sim->vip.xp.clocks > clocks) {
|
|
sim->vip.xp.clocks -= clocks;
|
|
sim->vip.xp.until -= clocks;
|
|
return;
|
|
}
|
|
|
|
/* Advance forward the component's number of clocks */
|
|
clocks -= sim->vip.xp.clocks;
|
|
sim->vip.xp.until -= sim->vip.xp.clocks;
|
|
sim->vip.xp.clocks = 0;
|
|
|
|
/* Processing by operation phase */
|
|
switch (sim->vip.xp.step) {
|
|
|
|
case 1: /* Initialization */
|
|
sim->vip.xp.halfword = 0;
|
|
sim->vip.xp.sbcount = 0;
|
|
if (sim->vip.dp.buffer == 0)
|
|
sim->vip.xp.f1bsy = 1;
|
|
else sim->vip.xp.f0bsy = 1;
|
|
vipRender(sim);
|
|
|
|
/* Fallthrough */
|
|
case 2: /* Begin drawing halfwords */
|
|
sim->vip.xp.column = 0;
|
|
sim->vip.xp.sbout = 2240; /* 112us */
|
|
sim->vip.xp.step = 3;
|
|
sim->vip.xp.until = 2000; /* 100us */
|
|
if (sim->vip.xp.sbcount == sim->vip.xp.sbcmp)
|
|
vipThrow(sim, 0x2000); /* SBHIT */
|
|
|
|
/* Fallthrough */
|
|
case 3: /* Draw one halfword */
|
|
vipTransferHalfword(sim);
|
|
sim->vip.xp.clocks = sim->vip.halfwords[sim->vip.xp.halfword];
|
|
sim->vip.xp.column ++;
|
|
sim->vip.xp.halfword++;
|
|
if (sim->vip.xp.column < 384)
|
|
break;
|
|
|
|
/* Transition to a new line of halfwords */
|
|
sim->vip.xp.sbcount++;
|
|
sim->vip.xp.step = sim->vip.xp.sbcount == 28 ? 4 : 2;
|
|
break;
|
|
|
|
case 4: /* Drawing complete */
|
|
sim->vip.xp.enabled = 0;
|
|
sim->vip.xp.step = 0;
|
|
if (sim->vip.dp.buffer == 0)
|
|
sim->vip.xp.f1bsy = 0;
|
|
else sim->vip.xp.f0bsy = 0;
|
|
vipThrow(sim, 0x4000); /* XPEND */
|
|
return;
|
|
}
|
|
|
|
}
|
|
|
|
return; /* Unreachable */
|
|
}
|
|
|
|
|
|
|
|
/***************************** Library Functions *****************************/
|
|
|
|
/* Process component */
|
|
static int vipEmulate(VB *sim, uint32_t clocks) {
|
|
|
|
/* Process sub-components */
|
|
int brk = vipEmulateDisplay(sim, clocks);
|
|
if (sim->vip.xp.step != 0)
|
|
vipEmulateDrawing(sim, clocks);
|
|
|
|
/* Process SBOUT */
|
|
if (sim->vip.xp.sbout != 0) {
|
|
if (sim->vip.xp.sbout <= clocks) {
|
|
sim->vip.xp.sbout = 0;
|
|
} else sim->vip.xp.sbout -= clocks;
|
|
}
|
|
|
|
return brk;
|
|
}
|
|
|
|
/* Read a typed value from the VIP bus */
|
|
static void vipRead(VB *sim, uint32_t address, int type, int32_t *value) {
|
|
|
|
/* Working variables */
|
|
address &= 0x0007FFFF;
|
|
|
|
/* RAM */
|
|
if (address < 0x40000)
|
|
*value = busReadBuffer(&sim->vip.ram[address], type);
|
|
|
|
/* Unmapped */
|
|
else if (address < 0x5E000)
|
|
*value = 0;
|
|
|
|
/* I/O register */
|
|
else if (address < 0x60000)
|
|
*value = vipReadIO(sim, address, type);
|
|
|
|
/* Unmapped */
|
|
else if (address < 0x78000)
|
|
*value = 0;
|
|
|
|
/* Mirrors of character memory */
|
|
else {
|
|
address = 0x06000 | (address << 2 & 0x18000) | (address & 0x01FFF);
|
|
*value = busReadBuffer(&sim->vip.ram[address], type);
|
|
}
|
|
|
|
}
|
|
|
|
/* Simulate a hardware reset */
|
|
static void vipReset(VB *sim) {
|
|
Cell *cell; /* BG map cell state */
|
|
Character *chr; /* Character state */
|
|
Object *obj; /* Object state */
|
|
World *world; /* World state */
|
|
int x, y; /* Iterators */
|
|
|
|
/* Normal */
|
|
sim->vip.intenb = 0x0000;
|
|
sim->vip.dp.disp = 0;
|
|
sim->vip.dp.re = 0;
|
|
sim->vip.dp.synce = 0;
|
|
sim->vip.xp.xpen = 0;
|
|
|
|
/* Extra (the hardware does not do this) */
|
|
sim->vip.bkcol = 0;
|
|
sim->vip.cta.cta_l = 0xFA;
|
|
sim->vip.cta.cta_r = 0xFA;
|
|
sim->vip.frmcyc = 0;
|
|
sim->vip.intpnd = 0x0000;
|
|
for (x = 0; x < 0x40000; x++)
|
|
sim->vip.ram[x] = 0;
|
|
for (x = 0; x < 4; x++) {
|
|
sim->vip.brtRest[x] = 0;
|
|
sim->vip.spt [x] = 0;
|
|
for (y = 0; y < 4; y++) {
|
|
sim->vip.gplt[x][y] = 0;
|
|
sim->vip.jplt[x][y] = 0;
|
|
}
|
|
}
|
|
for (x = 0; x < 0x10000; x++) {
|
|
cell = &sim->vip.cells[x];
|
|
cell->palette = sim->vip.gplt[0];
|
|
cell->pixels = sim->vip.characters[0][0];
|
|
}
|
|
for (x = 0; x < 2048; x++) {
|
|
chr = &sim->vip.characters[x];
|
|
for (y = 0; y < 64; y++)
|
|
(*chr)[0][y] = (*chr)[1][y] = (*chr)[2][y] = (*chr)[3][y] = 0;
|
|
}
|
|
for (x = 0; x < 32; x++) {
|
|
world = &sim->vip.worlds[x];
|
|
world->bgm = 0;
|
|
world->end = 0;
|
|
world->gp = 0;
|
|
world->gx = 0;
|
|
world->gy = 0;
|
|
world->mx = 0;
|
|
world->mp = 0;
|
|
world->my = 0;
|
|
world->over = 0;
|
|
world->overplane = &sim->vip.cells[0];
|
|
for (y = 0; y < 64; y++)
|
|
world->bg[0] = world->overplane;
|
|
world->bgHeight = 512;
|
|
world->bgMaskX = 0;
|
|
world->bgMaskY = 0;
|
|
world->bgShift = 0;
|
|
world->bgWidth = 512;
|
|
world->hAffine = 0;
|
|
world->hNaffine = 0;
|
|
world->height = 8;
|
|
world->lron = 0;
|
|
world->paramBase = 0;
|
|
world->wAffine = 0;
|
|
world->wNaffine = 0;
|
|
world->width = 0;
|
|
}
|
|
for (x = 0; x < 1024; x++) {
|
|
obj = &sim->vip.objects[x];
|
|
obj->cell.palette = sim->vip.jplt[0];
|
|
obj->cell.pixels = sim->vip.characters[0][0];
|
|
obj->jp = 0;
|
|
obj->jx = 0;
|
|
obj->jy = 0;
|
|
obj->lron = 0;
|
|
}
|
|
|
|
/* Display processor extra (the hardware does not do this) */
|
|
sim->vip.dp.fclk = 0;
|
|
sim->vip.dp.l0bsy = 0;
|
|
sim->vip.dp.l1bsy = 0;
|
|
sim->vip.dp.lock = 0;
|
|
sim->vip.dp.r0bsy = 0;
|
|
sim->vip.dp.r1bsy = 0;
|
|
sim->vip.dp.scanrdy = 1;
|
|
|
|
/* Pixel processor extra (the hardware does not do this) */
|
|
sim->vip.xp.f0bsy = 0;
|
|
sim->vip.xp.f1bsy = 0;
|
|
sim->vip.xp.overtime = 0;
|
|
sim->vip.xp.sbcmp = 0;
|
|
sim->vip.xp.sbcount = 0;
|
|
sim->vip.xp.sbout = 0;
|
|
|
|
/* Display processor other */
|
|
sim->vip.dp.brt[0] = 0;
|
|
sim->vip.dp.buffer = 0; /* TODO: Hardware might actually do this */
|
|
sim->vip.dp.clocks = 0;
|
|
sim->vip.dp.step = 0;
|
|
sim->vip.dp.until = 0;
|
|
|
|
/* Pixel processor other */
|
|
sim->vip.xp.clocks = 0;
|
|
sim->vip.xp.step = 0;
|
|
sim->vip.xp.until = 0;
|
|
}
|
|
|
|
/* Determine how many clocks are guaranteed to process */
|
|
static uint32_t vipUntil(VB *sim, uint32_t clocks) {
|
|
if (clocks > sim->vip.dp.until)
|
|
clocks = sim->vip.dp.until;
|
|
if (sim->vip.xp.step != 0 && clocks > sim->vip.xp.until)
|
|
clocks = sim->vip.xp.until;
|
|
return clocks;
|
|
}
|
|
|
|
/* Write a typed value to the VIP bus */
|
|
static void vipWrite(VB*sim,uint32_t address,int type,int32_t value,int debug){
|
|
|
|
/* Working variables */
|
|
address &= 0x0007FFFF;
|
|
|
|
/* RAM */
|
|
if (address < 0x40000) {
|
|
busWriteBuffer(&sim->vip.ram[address], type, value);
|
|
|
|
/* Character memory */
|
|
if ((address & 0x26000) == 0x06000) {
|
|
address = (address & 0x18000) >> 2 | (address & 0x01FFF);
|
|
vipWriteChr(sim, address, type, value);
|
|
}
|
|
|
|
/* BG map memory */
|
|
if (address >= 0x20000)
|
|
vipWriteCell(sim, address & 0x1FFFF, type, value);
|
|
|
|
/* World memory */
|
|
if ((address & 0x3FC00) == 0x3D800)
|
|
vipWriteWorld(sim, address &0x003FF, type, value);
|
|
|
|
/* Object memory */
|
|
if (address >= 0x3E000)
|
|
vipWriteObject(sim, address & 0x01FFF, type, value);
|
|
}
|
|
|
|
/* Unmapped */
|
|
else if (address < 0x5E000)
|
|
;
|
|
|
|
/* I/O register */
|
|
else if (address < 0x60000)
|
|
vipWriteIO(sim, address, type, value, debug);
|
|
|
|
/* Unmapped */
|
|
else if (address < 0x78000)
|
|
;
|
|
|
|
/* Mirrors of character memory */
|
|
else {
|
|
vipWriteChr(sim, address & 0x07FFF, type, value);
|
|
address = 0x06000 | (address << 2 & 0x18000) | (address & 0x01FFF);
|
|
busWriteBuffer(&sim->vip.ram[address], type, value);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* VBAPI */
|