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Add support for double buffering to hosted framebuffer code

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Requires kernel-level support to work.  No in-tree users yet

Change-Id: Iec7e22971aa24fc7a26996a3d507143955c0ab5c
This commit is contained in:
Solomon Peachy 2021-08-25 23:23:43 -04:00
parent 1f43b14127
commit 6acbf74d7f
1 changed files with 51 additions and 14 deletions
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65
firmware/target/hosted/lcd-linuxfb.c
View file

@ -34,13 +34,30 @@
#include "sysfs.h"
#include "panic.h"
//#define FB_DOUBLEBUF
static int fd = -1;
static struct fb_var_screeninfo vinfo;
static struct fb_fix_screeninfo finfo;
fb_data *framebuffer = NULL; /* global variable, see lcd-target.h */
#ifdef FB_DOUBLEBUF
static int fb_plane;
static int doublebuf;
#else
#define fb_plane 0
#endif
static void redraw(void)
{
#ifdef FB_DOUBLEBUF
if (doublebuf) {
vinfo.yoffset = fb_plane * LCD_HEIGHT;
fb_plane = !fb_plane;
vinfo.activate = FB_ACTIVATE_VBL;
}
#endif
ioctl(fd, FBIOPAN_DISPLAY, &vinfo);
}
@ -53,32 +70,54 @@ void lcd_init_device(void)
panicf("Cannot open framebuffer: %s\n", fb_dev);
}
/* get fixed and variable information */
/* get fixed information */
if(ioctl(fd, FBIOGET_FSCREENINFO, &finfo) < 0)
{
panicf("Cannot read framebuffer fixed information");
}
if (finfo.smem_len < FRAMEBUFFER_SIZE)
panicf("FRAMEBUFFER_SIZE too large for hardware? (%u vs %u)", FRAMEBUFFER_SIZE, finfo.smem_len);
#ifdef FB_DOUBLEBUF
if (finfo.smem_len >= 2*FRAMEBUFFER_SIZE)
doublebuf = 1;
fb_plane = 0;
#endif
/* get variable information */
if(ioctl(fd, FBIOGET_VSCREENINFO, &vinfo) < 0)
{
panicf("Cannot read framebuffer variable information");
}
#ifdef FB_DOUBLEBUF
if (doublebuf) {
vinfo.yres_virtual = vinfo.yres * 2;
if(ioctl(fd, FBIOPUT_VSCREENINFO, &vinfo) < 0) {
panicf("Cannot write framebuffer variable information");
}
}
#if 0
/* check resolution and framebuffer size */
if(vinfo.xres != LCD_WIDTH || vinfo.yres != LCD_HEIGHT || vinfo.bits_per_pixel != LCD_DEPTH)
{
panicf("Unexpected framebuffer resolution: %dx%dx%d\n", vinfo.xres,
vinfo.yres, vinfo.bits_per_pixel);
}
#endif
#else
/* Make sure we match our desired bitdepth */
if (vinfo.bits_per_pixel != LCD_DEPTH || vinfo.xres != LCD_WIDTH || vinfo.yres != LCD_HEIGHT) {
vinfo.bits_per_pixel = LCD_DEPTH;
vinfo.xres = LCD_WIDTH;
vinfo.yres = LCD_HEIGHT;
vinfo.yres_virtual = vinfo.yres; /* Ensure we're on the correct bank */
if (ioctl(fd, FBIOPUT_VSCREENINFO, &vinfo)) {
panicf("Cannot set framebuffer to %dx%dx%d",
vinfo.xres, vinfo.yres, vinfo.bits_per_pixel);
}
}
/* Note: we use a framebuffer size of width*height*bbp. We cannot trust the
* values returned by the driver for line_length */
if (finfo.smem_len < FRAMEBUFFER_SIZE)
panicf("FRAMEBUFFER_SIZE too large for hardware? (%u vs %u)", FRAMEBUFFER_SIZE, finfo.smem_len);
#endif
/* map framebuffer */
framebuffer = mmap(NULL, finfo.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
@ -114,13 +153,10 @@ void lcd_enable(bool on)
lcd_set_active(on);
if (on)
{
if (on) {
send_event(LCD_EVENT_ACTIVATION, NULL);
ioctl(fd, FB_BLANK_UNBLANK);
}
else
{
} else {
memset(framebuffer, 0, finfo.smem_len);
redraw();
ioctl(fd, FB_BLANK_POWERDOWN);
@ -140,7 +176,8 @@ void lcd_update(void)
#endif
{
/* Copy the Rockbox framebuffer to the second framebuffer */
lcd_copy_buffer_rect(LCD_FRAMEBUF_ADDR(0, 0), FBADDR(0,0),
fb_data *dst = LCD_FRAMEBUF_ADDR(0, 0) + (fb_plane * FRAMEBUFFER_SIZE);
lcd_copy_buffer_rect(dst, FBADDR(0,0),
LCD_WIDTH*LCD_HEIGHT, 1);
redraw();
}
@ -154,8 +191,8 @@ void lcd_update_rect(int x, int y, int width, int height)
if (lcd_active())
#endif
{
fb_data *dst = LCD_FRAMEBUF_ADDR(x, y);
fb_data * src = FBADDR(x,y);
fb_data *dst = LCD_FRAMEBUF_ADDR(x, y) + (fb_plane * FRAMEBUFFER_SIZE);
fb_data *src = FBADDR(x,y);
/* Copy part of the Rockbox framebuffer to the second framebuffer */
if (width < LCD_WIDTH)