pandora: tripplebuffer fbdev out, refactoring

git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@845 be3aeb3a-fb24-0410-a615-afba39da0efa
2025-09-05 14:57:46 -04:00 · 2009-12-20 19:47:55 +00:00 · 2009-12-20 19:47:55 +00:00 · b188c2b6d0
commit b188c2b6d0
parent fbe111032e
17 changed files with 404 additions and 171 deletions
--- a/linux/fbdev.c
+++ b/linux/fbdev.c
@ -0,0 +1,162 @@
+#include <stdio.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 "../common/emu.h"
+#include "fbdev.h"
+
+#define FBDEV_MAX_BUFFERS 3
+
+static int fbdev = -1;
+static void *fbdev_mem = MAP_FAILED;
+static int fbdev_mem_size;
+static struct fb_var_screeninfo fbvar_old;
+static struct fb_var_screeninfo fbvar_new;
+static int fbdev_buffer_write;
+
+void *fbdev_buffers[FBDEV_MAX_BUFFERS];
+int fbdev_buffer_count;
+
+void plat_video_flip(void)
+{
+	int draw_buf;
+
+	if (fbdev_buffer_count < 2)
+		return;
+
+	draw_buf = fbdev_buffer_write;
+	fbdev_buffer_write++;
+	if (fbdev_buffer_write >= fbdev_buffer_count)
+		fbdev_buffer_write = 0;
+
+	fbvar_new.yoffset = fbvar_old.yres * draw_buf;
+	g_screen_ptr = fbdev_buffers[fbdev_buffer_write];
+}
+
+void plat_video_wait_vsync(void)
+{
+	int arg = 0;
+	ioctl(fbdev, FBIO_WAITFORVSYNC, &arg);
+}
+
+int vout_fbdev_init(int *w, int *h)
+{
+	static const char *fbdev_name = "/dev/fb0";
+	int i, ret;
+
+	fbdev = open(fbdev_name, O_RDWR);
+	if (fbdev == -1) {
+		fprintf(stderr, "%s: ", fbdev_name);
+		perror("open");
+		return -1;
+	}
+
+	ret = ioctl(fbdev, FBIOGET_VSCREENINFO, &fbvar_old);
+	if (ret == -1) {
+		perror("FBIOGET_VSCREENINFO ioctl");
+		goto fail;
+	}
+
+	fbvar_new = fbvar_old;
+	printf("%s: %ix%i@%d\n", fbdev_name, fbvar_old.xres, fbvar_old.yres, fbvar_old.bits_per_pixel);
+	*w = fbvar_old.xres;
+	*h = fbvar_old.yres;
+	fbdev_buffer_count = FBDEV_MAX_BUFFERS; // be optimistic
+
+	if (fbvar_new.bits_per_pixel != 16) {
+		printf(" switching to 16bpp\n");
+		fbvar_new.bits_per_pixel = 16;
+		ret = ioctl(fbdev, FBIOPUT_VSCREENINFO, &fbvar_new);
+		if (ret == -1) {
+			perror("FBIOPUT_VSCREENINFO ioctl");
+			goto fail;
+		}
+	}
+
+	if (fbvar_new.yres_virtual < fbvar_old.yres * fbdev_buffer_count) {
+		fbvar_new.yres_virtual = fbvar_old.yres * fbdev_buffer_count;
+		ret = ioctl(fbdev, FBIOPUT_VSCREENINFO, &fbvar_new);
+		if (ret == -1) {
+			fbdev_buffer_count = 1;
+			fprintf(stderr, "Warning: failed to increase virtual resolution, "
+					"doublebuffering disabled\n");
+		}
+	}
+
+	fbdev_mem_size = *w * *h * 2 * fbdev_buffer_count;
+	fbdev_mem = mmap(0, fbdev_mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev, 0);
+	if (fbdev_mem == MAP_FAILED && fbdev_buffer_count > 1) {
+		fbdev_mem_size = *w * *h * 2;
+		fbdev_buffer_count = 1;
+		fprintf(stderr, "Warning: can't map %d bytes, doublebuffering disabled\n", fbdev_mem_size);
+		fbdev_mem = mmap(0, fbdev_mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev, 0);
+	}
+	if (fbdev_mem == MAP_FAILED) {
+		perror("mmap framebuffer");
+		goto fail;
+	}
+	memset(fbdev_mem, 0, fbdev_mem_size);
+	for (i = 0; i < fbdev_buffer_count; i++)
+		fbdev_buffers[i] = (char *)fbdev_mem + i * *w * *h * 2;
+	g_screen_ptr = fbdev_buffers[0];
+
+	// some checks
+	ret = 0;
+	ret = ioctl(fbdev, 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;
+		fbvar_new.yoffset = fbvar_old.yres * (fbdev_buffer_count - 1);
+		ret = ioctl(fbdev, FBIOPAN_DISPLAY, &fbvar_new);
+		if (ret != 0) {
+			fbdev_buffer_count = 1;
+			fprintf(stderr, "Warning: can't pan display, doublebuffering disabled\n");
+		}
+	}
+
+	printf("fbdev initialized.\n");
+	return 0;
+
+fail:
+	close(fbdev);
+	return -1;
+}
+
+void vout_fbdev_finish(void)
+{
+	ioctl(fbdev, FBIOPUT_VSCREENINFO, &fbvar_old);
+	if (fbdev_mem != MAP_FAILED)
+		munmap(fbdev_mem, fbdev_mem_size);
+	if (fbdev >= 0)
+		close(fbdev);
+	fbdev_mem = NULL;
+	fbdev = -1;
+}
+
+#if 0
+void *g_screen_ptr;
+int main()
+{
+	int w, h;
+	vout_fbdev_init(&w, &h);
+	//while (1)
+	{
+		memset(g_screen_ptr, 0xff, fbdev_mem_size / 2);
+		plat_video_wait_vsync();
+		plat_video_flip();
+		memset(g_screen_ptr, 0x00, fbdev_mem_size / 2);
+		usleep(8000);
+//		plat_video_wait_vsync();
+		plat_video_flip();
+	}
+}
+#endif