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dingusppc/devices/video/appleramdac.cpp

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-24 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** Apple RAMDAC ASICs (RaDACal & DACula) emulation. */
#include <core/bitops.h>
#include <devices/video/appleramdac.h>
#include <loguru.hpp>
#include <memaccess.h>
AppleRamdac::AppleRamdac(DacFlavour flavour) {
this->flavour = flavour;
supports_types(HWCompType::IOBUS_DEV);
set_name(this->flavour == DacFlavour::DACULA ? "DACula" : "RaDACal");
}
uint16_t AppleRamdac::iodev_read(uint32_t address) {
uint16_t result;
switch(address) {
case RamdacRegs::MULTI:
switch(this->dac_addr) {
case RamdacRegs::MISC_CTRL:
return this->dac_cr;
case RamdacRegs::PLL_CTRL:
return this->pll_cr;
case RamdacRegs::VENDOR_ID:
return this->dac_vendor;
default:
LOG_F(WARNING, "%s: read from unsupported multi-register at 0x%X",
this->name.c_str(), this->dac_addr);
}
break;
case RamdacRegs::CLUT_DATA:
if (this->comp_index == 0) {
this->get_clut_entry_cb(this->dac_addr, this->clut_color);
}
result = this->clut_color[this->comp_index];
this->comp_index++;
if (this->comp_index >= 3) {
this->dac_addr++; // auto-increment CLUT address
this->comp_index = 0;
}
return result;
default:
LOG_F(WARNING, "%s: read from unsupported register at 0x%X",
this->name.c_str(), address);
}
return 0;
}
void AppleRamdac::iodev_write(uint32_t address, uint16_t value) {
switch(address) {
case RamdacRegs::ADDRESS:
this->dac_addr = value;
this->comp_index = 0;
break;
case RamdacRegs::CURSOR_CLUT:
this->clut_color[this->comp_index++] = value;
if (this->comp_index >= 3) {
this->cursor_clut[this->dac_addr & 7] = (this->clut_color[0] << 16) |
(this->clut_color[1] << 8) | this->clut_color[2];
this->dac_addr++; // auto-increment CLUT address
this->comp_index = 0;
}
break;
case RamdacRegs::MULTI:
switch (this->dac_addr) {
case RamdacRegs::CURSOR_POS_HI:
#ifdef CURSOR_LO_DELAY // HACK: prevents artifacts in some cases, disabled by default
if (this->cursor_timer_id) {
TimerManager::get_instance()->cancel_timer(this->cursor_timer_id);
cursor_timer_id = 0;
}
this->cursor_xpos = (value << 8) | this->cursor_pos_lo;
#else
this->cursor_xpos = (value << 8) | (this->cursor_xpos & 0xff);
#endif
break;
case RamdacRegs::CURSOR_POS_LO:
#ifdef CURSOR_LO_DELAY // HACK: prevents artifacts in some cases, disabled by default
if (this->cursor_timer_id) {
TimerManager::get_instance()->cancel_timer(this->cursor_timer_id);
this->cursor_xpos = (this->cursor_xpos & 0xff00) | (this->cursor_pos_lo & 0x00ff);
cursor_timer_id = 0;
}
this->cursor_pos_lo = value;
this->cursor_timer_id = TimerManager::get_instance()->add_oneshot_timer(
NS_PER_SEC / 60, [this]() {
this->cursor_xpos = (this->cursor_xpos & 0xff00) | (this->cursor_pos_lo & 0x00ff);
});
#else
this->cursor_xpos = (this->cursor_xpos & 0xff00) | (value & 0x00ff);
#endif
break;
case RamdacRegs::MISC_CTRL:
if (bit_changed(this->dac_cr, value, 1)) {
if (value & 2)
this->cursor_ctrl_cb(true);
else
this->cursor_ctrl_cb(false);
}
this->dac_cr = value;
break;
case RamdacRegs::DBL_BUF_CTRL:
this->dbl_buf_cr = value;
break;
case RamdacRegs::TEST_CTRL:
this->tst_cr = value;
if (value & 1)
LOG_F(WARNING, "%s: DAC test enabled!", this->name.c_str());
break;
case RamdacRegs::PLL_CTRL:
this->pll_cr = value;
break;
case RamdacRegs::VIDCLK_M_SET_A:
this->clk_m[0] = value;
break;
case RamdacRegs::VIDCLK_PN_SET_A:
this->clk_pn[0] = value;
break;
case RamdacRegs::VIDCLK_M_SET_B:
this->clk_m[1] = value;
break;
case RamdacRegs::VIDCLK_PN_SET_B:
this->clk_pn[1] = value;
break;
default:
LOG_F(WARNING, "%s: write to unsupported multi-register at 0x%X",
this->name.c_str(), this->dac_addr);
}
break;
case RamdacRegs::CLUT_DATA:
if (this->comp_index == 0) {
this->get_clut_entry_cb(this->dac_addr, this->clut_color);
}
this->clut_color[this->comp_index++] = value;
if (this->comp_index >= 3) {
this->set_clut_entry_cb(this->dac_addr, this->clut_color);
this->dac_addr++; // auto-increment CLUT address
this->comp_index = 0;
}
break;
default:
LOG_F(WARNING, "%s: write to unsupported register at 0x%X",
this->name.c_str(), address);
}
}
int AppleRamdac::get_clock_div() {
return 1 << ((dac_cr >> 6) + 1);
}
int AppleRamdac::get_pix_width() {
return 1 << (((this->dac_cr >> 2) & 3) + 3);
}
int AppleRamdac::get_dot_freq() {
uint8_t m = this->clk_m[this->pll_cr & 1];
uint8_t p = this->clk_pn[this->pll_cr & 1] >> 5;
uint8_t n = this->clk_pn[this->pll_cr & 1] & 0x1F;
double dot_freq;
if (this->dac_vendor == DACULA_VENDOR_ATT)
dot_freq = 15000000.0f * (double)m / ((double)n + 2) / (double)(1 << p);
else if (this->dac_vendor == DACULA_VENDOR_SIERRA)
dot_freq = 14318180.0f * (double)m / ((double)n * (double)(1 << p));
else {
dot_freq = 14318180.0f * (double)m / (double)n / (double)(1 << p);
LOG_F(ERROR, "%s: unknown VENDOR_ID", this->name.c_str());
}
return static_cast<int>(dot_freq + 0.5f);
}
// =========================== HW cursor stuff =============================
void AppleRamdac::measure_hw_cursor(uint8_t *fb_ptr) {
uint8_t *src_bw_ptr = fb_ptr + this->fb_pitch * (this->video_height - 1);
int cur_pos_y_start = -1;
int cur_pos_y_end = -1;
// forward scanning to find the first line of the cursor
for (int h = 0; h < this->video_height; h++, fb_ptr += this->fb_pitch) {
if (((uint64_t *)fb_ptr)[0] | ((uint64_t *)fb_ptr)[1]) {
cur_pos_y_start = h;
break;
}
}
if (cur_pos_y_start < 0)
return; // bail out because no cursor data start was found
// backward scanning to find the last line of the cursor
for (int h = this->video_height - 1; h >= 0; h--, src_bw_ptr -= this->fb_pitch) {
if (((uint64_t *)src_bw_ptr)[0] | ((uint64_t *)src_bw_ptr)[1]) {
cur_pos_y_end = h;
break;
}
}
if (cur_pos_y_end < 0)
return; // bail out because no cursor data end was found
this->cursor_height = cur_pos_y_end - cur_pos_y_start + 1;
this->cursor_ypos = cur_pos_y_start;
}
void AppleRamdac::draw_hw_cursor(uint8_t *src_buf, uint8_t *dst_buf, int dst_pitch) {
int num_pixels = this->video_width - this->cursor_xpos;
if (num_pixels <= 0)
return;
if (num_pixels > 32)
num_pixels = 32;
this->measure_hw_cursor(src_buf);
int num_words = unsigned(num_pixels + 15) / 16;
uint64_t mask0 = (~0LL) << ((num_pixels >= 16) ? 0 : ((16 - num_pixels) * 4));
uint64_t mask1 = (num_pixels <= 16) ? 0LL : ((~0LL) << ((32 - num_pixels) * 4));
uint8_t *src_row = src_buf + this->fb_pitch * this->cursor_ypos;
uint8_t *dst_row = dst_buf + this->cursor_ypos * dst_pitch +
this->cursor_xpos * sizeof(uint32_t);
int src_pitch = this->fb_pitch;
uint32_t *color = &this->cursor_clut[0];
for (int h = this->cursor_height; h > 0; h--) {
uint8_t* dst_16 = dst_row;
for (int x = 0; x < num_words; x++) {
uint8_t* dst_1 = dst_16;
uint64_t pix_data = READ_QWORD_BE_A(src_row + x * sizeof(uint64_t)) & (x ? mask1 : mask0);
while (pix_data) {
uint8_t pix = pix_data >> 60; // each pixel is 4 bits wide
if (pix & 8) { // check control bit: 0 - transparent, 1 - opaque
WRITE_DWORD_LE_A(dst_1, color[pix & 7]);
} else if (pix & 1) {
uint32_t c = (((READ_DWORD_LE_A(dst_1) >> 7) & 0x010101) * 0xFFU) ^ 0xFFFFFFU;
WRITE_DWORD_LE_A(dst_1, c);
}
pix_data <<= 4;
dst_1 += sizeof(uint32_t);
}
dst_16 += 16 * sizeof(uint32_t);
}
src_row += src_pitch;
dst_row += dst_pitch;
}
}
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