--- /dev/null
+/*
+ * (C) GraÅžvydas "notaz" Ignotas, 2009-2010
+ *
+ * This work is licensed under the terms of any of these licenses
+ * (at your option):
+ * - GNU GPL, version 2 or later.
+ * - GNU LGPL, version 2.1 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <linux/fb.h>
+#include <linux/matroxfb.h>
+
+#include "fbdev.h"
+
+struct vout_fbdev {
+ int fd;
+ void *mem;
+ size_t mem_size;
+ struct fb_var_screeninfo fbvar_old;
+ struct fb_var_screeninfo fbvar_new;
+ int buffer_write;
+ int fb_size;
+ int buffer_count;
+ int top_border, bottom_border;
+};
+
+void *vout_fbdev_flip(struct vout_fbdev *fbdev)
+{
+ int draw_buf;
+
+ if (fbdev->buffer_count < 2)
+ return fbdev->mem;
+
+ draw_buf = fbdev->buffer_write;
+ fbdev->buffer_write++;
+ if (fbdev->buffer_write >= fbdev->buffer_count)
+ fbdev->buffer_write = 0;
+
+ fbdev->fbvar_new.yoffset =
+ (fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
+ fbdev->top_border;
+
+ ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
+
+ return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
+}
+
+void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
+{
+ int arg = 0;
+ ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
+}
+
+/* it is recommended to call vout_fbdev_clear() before this */
+void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
+ int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
+{
+ int w_total = left_border + w + right_border;
+ int h_total = top_border + h + bottom_border;
+ size_t mem_size;
+ int ret;
+
+ // unblank to be sure the mode is really accepted
+ ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
+
+ if (fbdev->fbvar_new.bits_per_pixel != bpp ||
+ fbdev->fbvar_new.xres != w ||
+ fbdev->fbvar_new.yres != h ||
+ fbdev->fbvar_new.xres_virtual != w_total||
+ fbdev->fbvar_new.yres_virtual < h_total ||
+ fbdev->fbvar_new.xoffset != left_border ||
+ fbdev->buffer_count != buffer_cnt)
+ {
+ if (fbdev->fbvar_new.bits_per_pixel != bpp ||
+ w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres)
+ printf(" switching to %dx%d@%d\n", w, h, bpp);
+
+ fbdev->fbvar_new.xres = w;
+ fbdev->fbvar_new.yres = h;
+ fbdev->fbvar_new.xres_virtual = w_total;
+ fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
+ fbdev->fbvar_new.xoffset = left_border;
+ fbdev->fbvar_new.yoffset = top_border;
+ fbdev->fbvar_new.bits_per_pixel = bpp;
+ fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb
+ fbdev->buffer_count = buffer_cnt;
+ fbdev->buffer_write = 1;
+
+ // seems to help a bit to avoid glitches
+ vout_fbdev_wait_vsync(fbdev);
+
+ ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
+ if (ret == -1) {
+ // retry with no multibuffering
+ fbdev->fbvar_new.yres_virtual = h_total;
+ ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
+ if (ret == -1) {
+ perror("FBIOPUT_VSCREENINFO ioctl");
+ return NULL;
+ }
+ fbdev->buffer_count = 1;
+ fbdev->buffer_write = 0;
+ fprintf(stderr, "Warning: failed to increase virtual resolution, "
+ "multibuffering disabled\n");
+ }
+
+ }
+
+ fbdev->fb_size = w_total * h_total * bpp / 8;
+ fbdev->top_border = top_border;
+ fbdev->bottom_border = bottom_border;
+
+ mem_size = fbdev->fb_size * fbdev->buffer_count;
+ if (fbdev->mem_size >= mem_size)
+ goto out;
+
+ if (fbdev->mem != NULL)
+ munmap(fbdev->mem, fbdev->mem_size);
+
+ fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
+ if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
+ fprintf(stderr, "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
+ fbdev->buffer_count = 1;
+ fbdev->buffer_write = 0;
+ mem_size = fbdev->fb_size;
+ fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
+ }
+ if (fbdev->mem == MAP_FAILED) {
+ fbdev->mem = NULL;
+ fbdev->mem_size = 0;
+ perror("mmap framebuffer");
+ return NULL;
+ }
+
+ fbdev->mem_size = mem_size;
+
+out:
+ return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
+}
+
+void vout_fbdev_clear(struct vout_fbdev *fbdev)
+{
+ memset(fbdev->mem, 0, fbdev->mem_size);
+}
+
+void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
+{
+ int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
+ int i;
+
+ if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
+ count = fbdev->top_border + fbdev->fbvar_new.yres - y;
+
+ if (y >= 0 && count > 0)
+ for (i = 0; i < fbdev->buffer_count; i++)
+ memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
+}
+
+int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
+{
+ return fbdev->fd;
+}
+
+struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt)
+{
+ struct vout_fbdev *fbdev;
+ int req_w, req_h;
+ void *pret;
+ int ret;
+
+ fbdev = calloc(1, sizeof(*fbdev));
+ if (fbdev == NULL)
+ return NULL;
+
+ fbdev->fd = open(fbdev_name, O_RDWR);
+ if (fbdev->fd == -1) {
+ fprintf(stderr, "%s: ", fbdev_name);
+ perror("open");
+ goto fail_open;
+ }
+
+ ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
+ if (ret == -1) {
+ perror("FBIOGET_VSCREENINFO ioctl");
+ goto fail;
+ }
+
+ fbdev->fbvar_new = fbdev->fbvar_old;
+
+ req_w = fbdev->fbvar_new.xres;
+ if (*w != 0)
+ req_w = *w;
+ req_h = fbdev->fbvar_new.yres;
+ if (*h != 0)
+ req_h = *h;
+
+ pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
+ if (pret == NULL)
+ goto fail;
+
+ printf("%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres, fbdev->fbvar_new.yres,
+ fbdev->fbvar_new.bits_per_pixel);
+ *w = fbdev->fbvar_new.xres;
+ *h = fbdev->fbvar_new.yres;
+
+ memset(fbdev->mem, 0, fbdev->mem_size);
+
+ // some checks
+ ret = 0;
+ ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
+ if (ret != 0)
+ fprintf(stderr, "Warning: vsync doesn't seem to be supported\n");
+
+ if (fbdev->buffer_count > 1) {
+ fbdev->buffer_write = 0;
+ fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
+ ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
+ if (ret != 0) {
+ fbdev->buffer_count = 1;
+ fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
+ }
+ }
+
+ printf("fbdev initialized.\n");
+ return fbdev;
+
+fail:
+ close(fbdev->fd);
+fail_open:
+ free(fbdev);
+ return NULL;
+}
+
+void vout_fbdev_finish(struct vout_fbdev *fbdev)
+{
+ ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
+ if (fbdev->mem != MAP_FAILED)
+ munmap(fbdev->mem, fbdev->mem_size);
+ if (fbdev->fd >= 0)
+ close(fbdev->fd);
+ fbdev->mem = NULL;
+ fbdev->fd = -1;
+ free(fbdev);
+}
+
notaz.gp2x.de / gpsp.git / blobdiff