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dingusppc/devices/video/pdmonboard.cpp
Maxim Poliakovski 9f4c248e4c Rework DBDMA logic for bidirectional channels.
2022-11-17 18:03:18 +01:00

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/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 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 PDM on-board video emulation. */
#include <core/timermanager.h>
#include <cpu/ppc/ppcmmu.h>
#include <devices/memctrl/hmc.h>
#include <devices/video/pdmonboard.h>
#include <devices/video/videoctrl.h>
#include <machines/machinebase.h>
#include <loguru.hpp>
#include <cinttypes>
PdmOnboardVideo::PdmOnboardVideo()
: VideoCtrlBase()
{
this->video_mode = PDM_VMODE_OFF;
this->blanking = 0x80;
this->crtc_on = false;
this->vdac_mode = 8;
this->pixel_depth = 0;
// get pointer to the Highspeed Memory controller
this->hmc_obj = dynamic_cast<HMC*>(gMachineObj->get_comp_by_name("HMC"));
}
void PdmOnboardVideo::set_video_mode(uint8_t new_mode)
{
switch(new_mode & 0x7F) {
case PdmVideoMode::Portrait:
case PdmVideoMode::Rgb12in:
case PdmVideoMode::Rgb13in:
case PdmVideoMode::Rgb16in:
case PdmVideoMode::VGA:
if (this->video_mode != (new_mode & 0x1F)) {
this->video_mode = new_mode & 0x1F;
LOG_F(INFO, "PDM-Video: video mode set to 0x%X", this->video_mode);
}
if (this->blanking != (new_mode & 0x80)) {
this->blanking = new_mode & 0x80;
if (this->blanking) {
this->disable_video_internal();
} else {
this->enable_video_internal();
}
}
break;
default:
LOG_F(9, "PDM-Video: video disabled, new mode = 0x%X", new_mode & 0x1F);
this->video_mode = new_mode & 0x1F;
this->blanking = 0x80;
this->crtc_on = false;
}
}
void PdmOnboardVideo::set_pixel_depth(uint8_t depth)
{
static uint8_t pix_depths[8] = {1, 2, 4, 8, 16, 0xFF, 0xFF, 0xFF};
uint8_t new_pix_depth = pix_depths[depth];
if (new_pix_depth == 0xFF) {
ABORT_F("PDM-Video: invalid pixel depth code %d specified!", depth);
}
if (new_pix_depth != this->pixel_depth) {
this->pixel_depth = new_pix_depth;
this->set_depth_internal(this->active_width);
LOG_F(INFO, "PDM-Video: pixel depth changed to %dbpp", new_pix_depth);
}
}
void PdmOnboardVideo::set_vdac_config(uint8_t mode)
{
this->vdac_mode = mode;
if ((mode & 0xF8) != 8) {
LOG_F(WARNING, "Ariel control changed to unknown value 0x%X", mode);
}
}
void PdmOnboardVideo::set_clut_index(uint8_t index)
{
this->clut_index = index;
this->comp_index = 0;
}
void PdmOnboardVideo::set_clut_color(uint8_t color)
{
this->clut_color[this->comp_index++] = color;
if (this->comp_index >= 3) {
// TODO: combine separate components into a single ARGB value
this->palette[this->clut_index][0] = this->clut_color[0];
this->palette[this->clut_index][1] = this->clut_color[1];
this->palette[this->clut_index][2] = this->clut_color[2];
this->palette[this->clut_index][3] = 255;
this->clut_index++; // assume the HW works like that
this->comp_index = 0; // assume the HW works like that
}
}
void PdmOnboardVideo::set_depth_internal(int pitch)
{
switch (this->pixel_depth) {
case 1:
this->convert_fb_cb = [this](uint8_t* dst_buf, int dst_pitch) {
this->convert_frame_1bpp(dst_buf, dst_pitch);
};
this->fb_pitch = pitch >> 3; // one byte contains 8 pixels
break;
case 8:
this->convert_fb_cb = [this](uint8_t* dst_buf, int dst_pitch) {
this->convert_frame_8bpp(dst_buf, dst_pitch);
};
this->fb_pitch = pitch; // one byte contains 1 pixel
break;
default:
ABORT_F("PDM-Video: pixel depth %d not implemented yet!", this->pixel_depth);
}
}
void PdmOnboardVideo::enable_video_internal()
{
int new_width, new_height, hori_blank, vert_blank;
// ensure all video parameters contain safe values
switch(this->video_mode) {
case PdmVideoMode::Portrait:
case PdmVideoMode::Rgb16in:
case PdmVideoMode::VGA:
if (this->pixel_depth > 8) {
ABORT_F("PDM-Video: no 16bpp support in mode %d!", this->video_mode);
}
default:
break;
}
// set video mode parameters
switch(this->video_mode) {
case PdmVideoMode::Portrait:
new_width = 640;
new_height = 870;
hori_blank = 192;
vert_blank = 48;
this->pixel_clock = 57283200;
break;
case PdmVideoMode::Rgb12in:
new_width = 512;
new_height = 384;
hori_blank = 128;
vert_blank = 23;
this->pixel_clock = 15667200;
break;
case PdmVideoMode::Rgb13in:
new_width = 640;
new_height = 480;
hori_blank = 256;
vert_blank = 45;
this->pixel_clock = 31334400;
break;
case PdmVideoMode::Rgb16in:
new_width = 832;
new_height = 624;
hori_blank = 320;
vert_blank = 43;
this->pixel_clock = 57283200;
break;
case PdmVideoMode::VGA:
new_width = 640;
new_height = 480;
hori_blank = 160;
vert_blank = 45;
this->pixel_clock = 25175000;
break;
default:
ABORT_F("PDM-Video: invalid video mode %d", this->video_mode);
}
if (new_width != this->active_width || new_height != this->active_height) {
LOG_F(WARNING, "Display window resizing not implemented yet!");
}
// figure out where our framebuffer is located
uint64_t hmc_control = this->hmc_obj->get_control_reg();
uint32_t fb_base_phys = ((hmc_control >> HMC_VBASE_BIT) & 1) ? 0 : 0x100000;
LOG_F(INFO, "PDM-Video: framebuffer phys base addr = 0x%X", fb_base_phys);
// set framebuffer address and pitch
this->fb_ptr = mmu_get_dma_mem(fb_base_phys, PDM_FB_SIZE_MAX, nullptr);
this->active_width = new_width;
this->active_height = new_height;
this->set_depth_internal(new_width);
// set up video refresh timer
double refresh_rate_hz = (double)(this->pixel_clock) / (new_width + hori_blank) / (new_height + vert_blank);
LOG_F(INFO, "PDM-Video: refresh rate set to %f Hz", refresh_rate_hz);
uint64_t refresh_interval = static_cast<uint64_t>(1.0f / refresh_rate_hz * NS_PER_SEC + 0.5);
TimerManager::get_instance()->add_cyclic_timer(
refresh_interval,
[this]() {
this->update_screen();
}
);
this->update_screen();
LOG_F(INFO, "PDM-Video: video enabled");
this->crtc_on = true;
}
void PdmOnboardVideo::disable_video_internal()
{
this->crtc_on = false;
LOG_F(INFO, "PDM-Video: video disabled");
}
/** Ariel II has a weird 1bpp mode where a white pixel is mapped to
CLUT entry #127 (%01111111) and a black pixel to #255 (%11111111).
It requres a non-standard conversion routine implementend below.
*/
void PdmOnboardVideo::convert_frame_1bpp(uint8_t *dst_buf, int dst_pitch)
{
uint8_t *src_buf, *src_row, pix;
uint32_t *dst_row;
int src_pitch, width;
uint32_t pixels[2];
// prepare cached ARGB values for white & black pixels
pixels[0] = (0xFF << 24) | (this->palette[127][0] << 16) |
(this->palette[127][1] << 8) | this->palette[127][2];
pixels[1] = (0xFF << 24) | (this->palette[255][0] << 16) |
(this->palette[255][1] << 8) | this->palette[255][2];
src_buf = this->fb_ptr;
src_pitch = this->fb_pitch;
width = this->active_width >> 3;
for (int h = 0; h < this->active_height; h++) {
src_row = &src_buf[h * src_pitch];
dst_row = (uint32_t *)(&dst_buf[h * dst_pitch]);
for (int x = 0; x < width; x++) {
pix = src_row[x];
for (int i = 0; i < 8; i++, pix <<= 1, dst_row++) {
*dst_row = pixels[(pix >> 7) & 1];
}
}
}
}
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