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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <dev/vcons/vcons.h>
#include <dev/vcons/vcons_io.h>
#include <dev/video/fbdev.h>
#include <sys/syslog.h>
#include <sys/cdefs.h>
#include <string.h>
__MODULE_NAME("kern_vcons");
__KERNEL_META("$Hyra$: kern_vcons.c, Ian Marco Moffett, "
"Hyra video console code");
/* Get x or y values in pixels */
#define PIX_CPY_X(scrptr) ((scrptr)->cpy_x * FONT_WIDTH)
#define PIX_CPY_Y(scrptr) ((scrptr)->cpy_y * FONT_HEIGHT)
#define PIX_BOUNDS_MAX_X(scrptr) ((scrptr)->fbdev.width - FONT_WIDTH)
#define PIX_BOUNDS_MAX_Y(scrptr) ((scrptr)->fbdev.height - FONT_HEIGHT)
static struct vcons_screen *screen = NULL;
/*
* Draw the console cursor.
*
* @color: Cursor color
*/
static void
vcons_draw_cursor(struct vcons_screen *scr, uint32_t color)
{
struct vcons_cursor *cursor = &scr->cursor;
struct fbdev fbdev = scr->fbdev;
uint32_t *fbdev_mem = fbdev.mem;
uint32_t fbdev_idx = 0;
uint32_t cx, cy;
for (size_t y = VCONS_CURSOR_HEIGHT; y > 0; --y) {
for (size_t x = VCONS_CURSOR_WIDTH; x > 0; --x) {
cx = cursor->old_xpos + x;
cy = cursor->old_ypos + y;
fbdev_idx = fbdev_get_index(&fbdev, cx, cy);
fbdev_mem[fbdev_idx] = color;
}
}
}
/*
* Clear everything out of the console.
*/
static void
vcons_clear_scr(struct vcons_screen *scr)
{
struct fbdev fbdev = scr->fbdev;
scr->cpy_x = 0, scr->cpy_y = 0;
memset(scr->fbdev_mem, scr->bg, (fbdev.pitch * fbdev.height));
vcons_update_cursor(scr);
}
/*
* Renders a char onto the screen specified by `scr`.
*
* @x,y: In chars
*/
static void
vcons_draw_char(struct vcons_screen *scr, char c, uint32_t x, uint32_t y)
{
uint32_t *fb_ptr;
size_t idx;
const uint8_t *glyph;
/* Get a pointer to framebuffer memory */
fb_ptr = scr->fbdev_mem;
/* Get the specific glyph of `c` */
glyph = &DEFAULT_FONT_DATA[(int)c*16];
for (uint32_t cy = 0; cy < FONT_HEIGHT; ++cy) {
for (uint32_t cx = 0; cx < FONT_WIDTH; ++cx) {
idx = fbdev_get_index(&scr->fbdev, x+FONT_WIDTH-cx, y+cy);
fb_ptr[idx] = __TEST(glyph[cy], __BIT(cx)) ? scr->fg : scr->bg;
}
}
}
/*
* Update the cursor position.
*
* XXX: This function also accounts for the old cursor
* and clears it before drawing the new cursor.
*/
void
vcons_update_cursor(struct vcons_screen *scr)
{
struct vcons_cursor *cursor = &scr->cursor;
cursor->is_drawing = true;
if (cursor->is_drawn) {
/* Clear old cursor */
vcons_draw_cursor(scr, scr->bg);
}
cursor->old_xpos = cursor->xpos;
cursor->old_ypos = cursor->ypos;
vcons_draw_cursor(scr, scr->fg);
cursor->is_drawn = true;
cursor->is_drawing = false;
}
/*
* Write out a character on the console.
*
* @c: Character to write.
*/
int
vcons_putch(struct vcons_screen *scr, char c)
{
uint32_t x = PIX_CPY_X(scr);
uint32_t y = PIX_CPY_Y(scr);
struct vcons_cursor *cursor = &scr->cursor;
bool cursor_newline = false;
while (cursor->is_drawing);
if (scr == NULL) {
return 1;
}
if (vcons_process_output(scr, c) >= 0) {
/* No need to do anything */
return 0;
}
/* Check cursor bounds */
if (cursor->xpos >= PIX_BOUNDS_MAX_X(scr)) {
cursor->xpos = FONT_WIDTH;
cursor->ypos += FONT_HEIGHT;
cursor_newline = true;
}
if (cursor->ypos >= PIX_BOUNDS_MAX_Y(scr)) {
cursor->xpos = FONT_WIDTH;
cursor->ypos = 0;
}
/* Check text bounds */
if (x >= PIX_BOUNDS_MAX_X(scr)) {
/* Wrap to the next row */
++scr->cpy_y, scr->cpy_x = 0;
x = PIX_CPY_X(scr), y = PIX_CPY_Y(scr);
}
if (y >= PIX_BOUNDS_MAX_Y(scr)) {
scr->cpy_y = 0;
scr->cpy_x = 0;
vcons_clear_scr(scr);
x = PIX_CPY_X(scr), y = PIX_CPY_Y(scr);
}
if (!cursor_newline) {
cursor->xpos += FONT_WIDTH;
}
vcons_update_cursor(scr);
vcons_draw_char(scr, c, x, y);
++scr->cpy_x;
return 0;
}
/*
* Write out a string on the console.
*
* @s: String to write.
*/
int
vcons_putstr(struct vcons_screen *scr, const char *s, size_t len)
{
int status;
for (size_t i = 0; i < len; ++i) {
if ((status = vcons_putch(scr, s[i])) != 0) {
return status;
}
}
return 0;
}
void
vcons_attach(struct vcons_screen *scr)
{
scr->fbdev = fbdev_get_front();
scr->fbdev_mem = scr->fbdev.mem;
scr->nrows = scr->fbdev.height;
scr->ncols = scr->fbdev.width;
screen = scr;
vcons_clear_scr(scr);
}
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