dingusppc/devices/video/appleramdac.h
joevt 503ee92528 appleramdac: Always change cursor position.
Tests in Open Firmware confirm that writing to CURSOR_POS_LO will change the cursor position even if a write to CURSOR_POS_HI doesn't happen.
2024-04-21 13:41:06 -07:00

125 lines
4.6 KiB
C++

/*
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/>.
*/
/** Definitions for the Apple RAMDAC ASICs (RaDACal & DACula). */
#ifndef APPLE_RAMDAC_H
#define APPLE_RAMDAC_H
#include <devices/common/hwcomponent.h>
#include <devices/ioctrl/macio.h>
#include <cinttypes>
#include <functional>
enum DacFlavour {
RADACAL,
DACULA,
};
#define DACULA_VENDOR_SIERRA 0x3C // 14.3 MHz
#define DACULA_VENDOR_ATT 0x84 // 15 MHz
constexpr auto VIDEO_XTAL = 14318180.0f; // external crystal oscillator frequency
namespace RamdacRegs {
enum RamdacRegs : uint8_t {
ADDRESS = 0, // address register
CURSOR_CLUT = 1, // cursor palette data
MULTI = 2, // multipurpose section
CLUT_DATA = 3, // color palette data
// multipurpose section registers (both RaDACal & DACula)
CURSOR_POS_HI = 0x10, // cursor position, high-order byte
CURSOR_POS_LO = 0x11, // cursor position, low-order byte
MISC_CTRL = 0x20, // miscellaneus control bits ; Dacula: read ; when 1MB VRAM then write (mode&15) else write (mode)
DBL_BUF_CTRL = 0x21, // double buffer control bits ; Dacula: write 4; Radical: set to 0 if using optional bank (bankb) in Open Firmware or for 2nd page in ndrv
TEST_CTRL = 0x22, // enable/disable DAC tests ; Dacula: write 0
// multipurpose section registers (DACula only)
PLL_CTRL = 0x23, // phase locked loop control ; Dacula: if read 2 then write 3 else write 2 <-
VIDCLK_M_SET_A = 0x24, // M parameter for the set A ; Dacula: N2 for 2
VIDCLK_PN_SET_A = 0x25, // P & N parameters for the set A ; Dacula: D2 for 2
// = 0x26, // Dacula: write 0xc6 before changing the clock
VIDCLK_M_SET_B = 0x27, // M parameter for the set B ; Dacula: N2 for 3 <-
VIDCLK_PN_SET_B = 0x28, // P & N parameters for the set B ; Dacula: D2 for 3 <-
DAC_29 = 0x29, // Dacula: linux writes 0xa6 after changing the clock ; macrom writes 0xc6
VENDOR_ID = 0x40, // Dacula: DAC_TYPE 0x3c or 0x84
};
}; // namespace RamdacRegs
typedef std::function<void(uint8_t index, uint8_t *colors)> GetClutEntryCallback;
typedef std::function<void(uint8_t index, uint8_t *colors)> SetClutEntryCallback;
typedef std::function<void(bool cursor_on)> CursorCtrlCallback;
class AppleRamdac : public HWComponent, public IobusDevice {
public:
AppleRamdac(DacFlavour flavour);
~AppleRamdac() = default;
uint16_t iodev_read(uint32_t address);
void iodev_write(uint32_t address, uint16_t value);
int get_clock_div();
int get_pix_width();
int get_dot_freq();
uint8_t get_dbl_buf_cr() { return dbl_buf_cr; }
void set_fb_parameters(int width, int height, uint32_t pitch) {
this->video_width = width;
this->video_height = height;
this->fb_pitch = pitch;
};
void measure_hw_cursor(uint8_t *fb_ptr);
void draw_hw_cursor(uint8_t *src_buf, uint8_t *dst_buf, int dst_pitch);
GetClutEntryCallback get_clut_entry_cb = nullptr;
SetClutEntryCallback set_clut_entry_cb = nullptr;
CursorCtrlCallback cursor_ctrl_cb = nullptr;
protected:
DacFlavour flavour;
uint8_t dac_addr = 0;
uint8_t dac_cr = 0;
uint8_t dbl_buf_cr = 0;
uint8_t tst_cr = 0;
uint16_t cursor_xpos = 0; // horizontal position of the cursor region
uint16_t cursor_ypos = 0;
uint16_t cursor_height = 0;
uint8_t cursor_pos_lo = 0;
uint8_t clk_m[2] = {};
uint8_t clk_pn[2] = {};
uint8_t pll_cr = 0;
uint8_t dac_vendor = DACULA_VENDOR_SIERRA;
uint8_t comp_index = 0;
uint8_t clut_color[3] = {};
uint32_t cursor_clut[8] = {};
int video_width = 0;
int video_height = 0;
uint32_t fb_pitch = 0;
uint32_t cursor_timer_id = 0;
};
#endif // APPLE_RAMDAC_H