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dingusppc/devices/video/displayid.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/>.
*/
/** @file DisplayID class implementation. */
#include <devices/video/displayid.h>
#include <loguru.hpp>
#include <machines/machineproperties.h>
#include <cinttypes>
#include <map>
#include <string>
typedef struct {
uint16_t h;
uint16_t v;
float pixel_clock; // MHz
float h_freq; // kHz
float refresh; // Hz
} MonitorRes;
typedef struct {
uint8_t std_sense_code;
uint8_t ext_sense_code;
const char * apple_enum;
const char * name;
const char * description;
MonitorRes resolutions[10];
} MonitorInfo;
/** Mapping between monitor IDs and their sense codes. */
static const std::map<std::string, MonitorInfo> MonitorIdToCode = {
{ "MacColor21in", {
0, 0x00,
"kESCZero21Inch",
"21\" RGB",
"RGB 21\", 21\" Color, Apple 21S Color", {
{1152, 870, 100 , 68.7 , 75 }
}
}},
{ "PortraitGS", {
1, 0x14,
"kESCOnePortraitMono",
"Portrait Monochrome",
"B&W 15\", Apple Portrait", {
{ 640, 870, 57.2832, 68.9 , 75 }
}
}},
{ "MacRGB12in", {
2, 0x21,
"kESCTwo12Inch",
"12\" RGB",
"12\" Apple RGB", {
{ 512, 384, 15.6672, 24.48 , 60.15}
}
}},
{ "Radius21in", {
3, 0x31,
"kESCThree21InchRadius",
"21\" RGB (Radius)",
"", {
{1152, 870, 100 , 68.7 , 75 }
}
}},
{ "Radius21inGS", {
3, 0x34,
"kESCThree21InchMonoRadius",
"21\" Monochrome (Radius)",
"", {
{1152, 870, 100 , 68.7 , 75 }
}
}},
{ "TwoPageGS", {
3, 0x35,
"kESCThree21InchMono",
"21\" Monochrome",
"B&W 21\", Apple 2 Page Mono", {
{1152, 870, 100 , 68.7 , 75 }
}
}},
{ "NTSC", {
4, 0x0A,
"kESCFourNTSC",
"NTSC",
"", {
{ 512, 384, 12.2727, 15.7 , 59.94},
{ 640, 480, 12.2727, 15.7 , 59.94}
}
}},
{ "MacRGB15in", {
5, 0x1E,
"kESCFivePortrait",
"Portrait RGB",
"RGB 15\", 15\" Tilt", {
{ 640, 870, 57.2834, 0 , 75 }
}
}},
{ "Multiscan15in", {
6, 0x03,
"kESCSixMSB1",
"MultiScan Band-1 (12\" thru 16\")",
"Multiple Scan 13, 14\"", {
{ 640, 480, 0 , 0 , 67 },
{ 832, 624, 0 , 0 , 75 }
}
}},
{ "Multiscan17in", {
6, 0x0B,
"kESCSixMSB2",
"MultiScan Band-2 (13\" thru 19\")",
"Multiple Scan 16, 17\"", {
{ 640, 480, 0 , 0 , 67 },
{ 832, 624, 0 , 0 , 75 },
{1024, 768, 0 , 0 , 75 }
}
}},
{ "Multiscan20in", {
6, 0x23,
"kESCSixMSB3",
"MultiScan Band-3 (13\" thru 21\")",
"Multiple Scan 20, 21\"", {
{ 640, 480, 0 , 0 , 67 },
{ 640, 480, 0 , 0 ,120 }, // control; not platinum
{ 832, 624, 0 , 0 , 75 },
{1024, 768, 0 , 0 , 74.9 },
{1152, 870, 0 , 0 , 75 },
{1280, 960, 0 , 0 , 75 },
{1280,1024, 0 , 0 , 75 }
}
}},
{ "HiRes12-14in", {
6, 0x2B,
"kESCSixStandard",
"13\"/14\" RGB or 12\" Monochrome",
"B&W 12\", 12\" Apple Monochrome, 13\" Apple RGB, Hi-Res 12-14\"", {
{ 640, 480, 30.24 , 35.0 , 66.7 },
}
}},
{ "PALEncoder", {
7, 0x00,
"kESCSevenPAL",
"PAL",
"PAL, NTSC/PAL (Option 1)", {
{ 640, 480, 14.75 , 15.625, 50 },
{ 768, 576, 14.75 , 15.625, 50 }
}
}},
{ "NTSCEncoder", {
7, 0x14,
"kESCSevenNTSC",
"NTSC",
"NTSC w/convolution (Alternate)", {
{ 512, 384, 12.2727, 0 , 60 },
{ 640, 480, 12.2727, 0 , 60 }
}
}},
{ "VGA-SVGA", {
7, 0x17,
"kESCSevenVGA",
"VGA",
"VGA", {
{ 640, 480, 0 , 0 , 60 },
{ 640, 480, 0 , 0 ,120 }, // control; not platinum
{ 800, 600, 0 , 0 , 60 },
{ 800, 600, 0 , 0 , 72 },
{ 800, 600, 0 , 0 , 75 },
{1024, 768, 0 , 0 , 60 },
{1024, 768, 0 , 0 , 70 },
{1024, 768, 0 , 0 , 75 },
{1280, 960, 0 , 0 , 75 },
{1280,1024, 0 , 0 , 75 }
}
}},
{ "MacRGB16in", {
7, 0x2D,
"kESCSeven16Inch",
"16\" RGB (GoldFish)",
"RGB 16\", 16\" Color", {
{ 832, 624, 57.2832, 49.7 , 75 }
}
}},
{ "PAL", {
7, 0x30,
"kESCSevenPALAlternate",
"PAL (Alternate)",
"PAL w/convolution (Alternate) (Option 2)", {
{ 640, 480, 14.75 , 15.625, 50 },
{ 768, 576, 14.75 , 15.625, 50 }
}
}},
{ "MacRGB19in", {
7, 0x3A,
"kESCSeven19Inch",
"Third-Party 19",
"RGB 19\", 19\" Color", {
{1024, 768, 80 , 0 , 74.9 }
}
}},
{ "DDC", {
7, 0x3E,
"kESCSevenDDC",
"DDC display",
"EDID", {
{1024, 768, 80 , 0 , 0 }
}
}},
{ "NotConnected", {
7, 0x3F,
"kESCSevenNoDisplay",
"No display connected",
"no-connect"
}},
};
static const std::map<std::string, std::string> MonitorAliasToId = {
{ "AppleVision1710", "HiRes12-14in" }
};
DisplayID::DisplayID()
{
// assume a DDC monitor is connected by default
this->id_kind = Disp_Id_Kind::DDC2B;
std::string mon_id = GET_STR_PROP("mon_id");
if (!mon_id.empty()) {
if (MonitorAliasToId.count(mon_id)) {
mon_id = MonitorAliasToId.at(mon_id);
}
if (MonitorIdToCode.count(mon_id)) {
auto monitor = MonitorIdToCode.at(mon_id);
this->std_sense_code = monitor.std_sense_code;
this->ext_sense_code = monitor.ext_sense_code;
this->id_kind = Disp_Id_Kind::AppleSense;
LOG_F(INFO, "DisplayID mode set to AppleSense");
LOG_F(INFO, "Standard sense code: %d", this->std_sense_code);
LOG_F(INFO, "Extended sense code: 0x%02X", this->ext_sense_code);
}
}
/* Initialize DDC I2C bus */
this->next_state = I2CState::STOP;
this->prev_state = I2CState::STOP;
this->last_sda = 1;
this->last_scl = 1;
this->data_ptr = 0;
this->data_pos = 0;
}
DisplayID::DisplayID(uint8_t std_code, uint8_t ext_code)
{
this->id_kind = Disp_Id_Kind::AppleSense;
this->std_sense_code = std_code;
this->ext_sense_code = ext_code;
}
uint8_t DisplayID::read_monitor_sense(uint8_t levels, uint8_t dirs)
{
uint8_t scl, sda;
switch(this->id_kind) {
case Disp_Id_Kind::DDC2B:
/* If GPIO pins are in the output mode, pick up their levels.
In the input mode, GPIO pins will be read "high" */
scl = (dirs & 2) ? !!(levels & 2) : 1;
sda = (dirs & 4) ? !!(levels & 4) : 1;
return update_ddc_i2c(sda, scl);
case Disp_Id_Kind::AppleSense:
switch ((dirs << 3) | levels) {
case 0x23: // Sense line 2 pulled low
return ((this->ext_sense_code >> 4) & 3);
case 0x15: // Sense line 1 pulled low
return (((this->ext_sense_code & 8) >> 1) |
((this->ext_sense_code & 4) >> 2));
case 0xE: // Sense line 0 pulled low
return ((this->ext_sense_code & 3) << 1);
default:
return this->std_sense_code;
}
}
}
uint8_t DisplayID::set_result(uint8_t sda, uint8_t scl)
{
uint16_t data_out;
this->last_sda = sda;
this->last_scl = scl;
data_out = 0;
if (scl) {
data_out |= 2;
}
if (sda) {
data_out |= 4;
}
return data_out;
}
uint8_t DisplayID::update_ddc_i2c(uint8_t sda, uint8_t scl)
{
bool clk_gone_high = false;
if (scl != this->last_scl) {
this->last_scl = scl;
if (scl) {
clk_gone_high = true;
}
}
if (sda != this->last_sda) {
/* START = SDA goes high to low while SCL is high */
/* STOP = SDA goes low to high while SCL is high */
if (this->last_scl) {
if (!sda) {
LOG_F(9, "DDC-I2C: START condition detected!");
this->next_state = I2CState::DEV_ADDR;
this->bit_count = 0;
} else {
LOG_F(9, "DDC-I2C: STOP condition detected!");
this->next_state = I2CState::STOP;
}
}
return set_result(sda, scl);
}
if (!clk_gone_high) {
return set_result(sda, scl);
}
switch (this->next_state) {
case I2CState::STOP:
break;
case I2CState::ACK:
this->bit_count = 0;
this->byte = 0;
switch (this->prev_state) {
case I2CState::DEV_ADDR:
if ((dev_addr & 0xFE) == 0xA0) {
sda = 0; /* send ACK */
} else {
LOG_F(ERROR, "DDC-I2C: unknown device address 0x%X", this->dev_addr);
sda = 1; /* send NACK */
}
if (this->dev_addr & 1) {
this->next_state = I2CState::DATA;
this->data_ptr = this->edid;
this->data_pos = 0;
this->byte = this->data_ptr[this->data_pos++];
} else {
this->next_state = I2CState::REG_ADDR;
}
break;
case I2CState::REG_ADDR:
this->next_state = I2CState::DATA;
if (!this->reg_addr) {
sda = 0; /* send ACK */
} else {
LOG_F(ERROR, "DDC-I2C: unknown register address 0x%X", this->reg_addr);
sda = 1; /* send NACK */
}
break;
case I2CState::DATA:
this->next_state = I2CState::DATA;
if (dev_addr & 1) {
if (!sda) {
/* load next data byte */
if (data_pos < 128)
this->byte = this->data_ptr[this->data_pos++];
else
this->byte = 0;
} else {
LOG_F(ERROR, "DDC-I2C: Oops! NACK received");
}
} else {
sda = 0; /* send ACK */
}
break;
}
break;
case I2CState::DEV_ADDR:
case I2CState::REG_ADDR:
this->byte = (this->byte << 1) | this->last_sda;
if (this->bit_count++ >= 7) {
this->bit_count = 0;
this->prev_state = this->next_state;
this->next_state = I2CState::ACK;
if (this->prev_state == I2CState::DEV_ADDR) {
LOG_F(9, "DDC-I2C: device address received, addr=0x%X", this->byte);
this->dev_addr = this->byte;
} else {
LOG_F(9, "DDC-I2C: register address received, addr=0x%X", this->byte);
this->reg_addr = this->byte;
}
}
break;
case I2CState::DATA:
sda = (this->byte >> (7 - this->bit_count)) & 1;
if (this->bit_count++ >= 7) {
this->bit_count = 0;
this->prev_state = this->next_state;
this->next_state = I2CState::ACK;
}
break;
}
return set_result(sda, scl);
}
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