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// SPDX-License-Identifier: GPL-2.0+
/*******************************************************************************
* QtMips - MIPS 32-bit Architecture Subset Simulator
*
* Implemented to support following courses:
*
* B35APO - Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b35apo
*
* B4M35PAP - Advanced Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
*
* Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
* Copyright (c) 2019 Pavel Pisa <pisa@cmp.felk.cvut.cz>
*
* Faculty of Electrical Engineering (http://www.fel.cvut.cz)
* Czech Technical University (http://www.cvut.cz/)
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
******************************************************************************/
#include "lcddisplay.h"
using namespace machine;
LcdDisplay::LcdDisplay() {
change_counter = 0;
size_t need_bytes;
fb_size = 0x4b000;
fb_bpp = 16;
fb_width = 480;
fb_height = 320;
if (fb_bpp > 12) {
fb_linesize = ((fb_bpp + 7) >> 3) * fb_width;
} else {
fb_linesize = (fb_bpp * fb_width + 7) >> 3;
}
need_bytes = fb_linesize * fb_height;
if (fb_size <= need_bytes)
fb_size = need_bytes;
fb_data = new uchar[fb_size];
std::fill(fb_data, fb_data + fb_size, 0);
}
LcdDisplay::~LcdDisplay() {
if (fb_data != nullptr)
delete[] fb_data;
}
std::uint32_t LcdDisplay::pixel_address(uint x, uint y)
{
std::uint32_t address;
address = y * fb_linesize;
if (fb_bpp > 12)
address += x * ((fb_bpp + 7) >> 3);
else
address += x * fb_bpp / 8;
return address;
}
bool LcdDisplay::wword(std::uint32_t address, std::uint32_t value) {
address &= ~3;
uint x, y, r, g, b;
std::uint32_t c;
std::uint32_t last_addr = address + 3;
std::uint32_t pixel_addr;
if (address + 3 >= fb_size)
return 0;
#if 0
printf("LcdDisplay::wword address 0x%08lx data 0x%08lx\n",
(unsigned long)address, (unsigned long)value);
#endif
if (value == rword(address, true))
return false;
fb_data[address + 0] = (value >> 24) & 0xff;
fb_data[address + 1] = (value >> 16) & 0xff;
fb_data[address + 2] = (value >> 8) & 0xff;
fb_data[address + 3] = (value >> 0) & 0xff;
change_counter++;
y = address / fb_linesize;
if (fb_bpp > 12)
x = (address - y * fb_linesize) / ((fb_bpp + 7) >> 3);
else
x = (address - y * fb_linesize) * 8 / fb_bpp;
while ((pixel_addr = pixel_address(x, y)) <= last_addr) {
c = fb_data[pixel_addr] << 8;
c |= fb_data[pixel_addr + 1];
r = ((c >> 11) & 0x1f) << 3;
g = ((c >> 5) & 0x3f) << 2;
b = ((c >> 0) & 0x1f) << 3;
emit pixel_update(x, y, r, g, b);
if (++x >= fb_width) {
x = 0;
y++;
}
}
emit write_notification(address, value);
return true;
}
std::uint32_t LcdDisplay::rword(std::uint32_t address, bool debug_access) const {
address &= ~3;
(void)debug_access;
std::uint32_t value;
if (address + 3 >= fb_size)
return 0;
value = (std::uint32_t)fb_data[address + 0] << 24;
value |= (std::uint32_t)fb_data[address + 1] << 16;
value |= (std::uint32_t)fb_data[address + 2] << 8;
value |= (std::uint32_t)fb_data[address + 3] << 0;
#if 0
printf("LcdDisplay::rword address 0x%08lx data 0x%08lx\n",
(unsigned long)address, (unsigned long)value);
#endif
emit read_notification(address, &value);
return value;
}
std::uint32_t LcdDisplay::get_change_counter() const {
return change_counter;
}
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