Photo Viewer

[fredericcking]

Is there a photo viewer for Dreamcast in 240p?

[Roareye]

Why 240p specifically? The Dreamcast can go up to 576p.

[Ian Micheal]

DCMC custom can do 1024x1024 size pictures at vga.. HQ of any photo view with zoom and rotation why 240p indeed not really the main point of the dreamcast..

[Roareye]

DCMC custom can do 1024x1024 size pictures at vga.. HQ of any photo view with zoom and rotation why 240p indeed not really the main point of the dreamcast..

Oh wow. Didn't think the DC could actually output that high a resolution! Or is it that it can load a 1024 image, but not give a native 1024p output?

[fredericcking]

Why 240p specifically? The Dreamcast can go up to 576p.

I have the Dreamcast for composite video at a crt and the 480p image shakes a lot and looks a bit blurry. Games like Gunlord, Gunbjrd, Fast Striker output a perfect 240p image but most are 480p

[Roareye]

That's odd. Well DCMC custom would still allow you to do that, since the composite output would be determined by your hardware, not the software necessarily.

Have you tried SCART instead of composite? It's a far superior signal in every way, might fix the 480i/p wobble you're getting.

[Ian Micheal]

DCMC custom can do 1024x1024 size pictures at vga.. HQ of any photo view with zoom and rotation why 240p indeed not really the main point of the dreamcast..

Oh wow. Didn't think the DC could actually output that high a resolution! Or is it that it can load a 1024 image, but not give a native 1024p output?

Output 640x480 vga texture quality the image is 1024x1024 so you can zoom in read it like a book etc size of the image res size is 1024x1024 etc

I have shown this before in neogeo pocket x effect it's the texture quality but with dreamhal you can do above what katana can output

High Resolution Dreamcast Video Modes!
Post by nymus » Wed Feb 19, 2020 6:54 pm

Exciting stuff! I went back and read the readme which was definitely easier to integrate than the way I had hacked it. The modes output correctly (I tried 800x600, 1024x768 and 720p) but I've been having trouble rendering using the pvr 3d pipeline because I'm not informed on the detailed workings of graphics hardware.

However, I was just too excited about this to sit idly by so I poked and prodded, learning whatever I could along the way, until I finally got something showing in 1024x768. It looks interlaced and offset from the vsync/hsync... thing-a-ma-jigs but I don't care! Dreamcast HD is happening, Moop! I can rest now... for a little while.

With Dreamhal

-- Overview of Available Modes --

"PVR 32x32" means the framebuffer is a multiple of 32x32. Modes without that
label are "raw modes" and have no blank pixels or extra pixels, which may be
useful for compatibility testing or software renderers. Modes that only have
a PVR 32x32 version are actually raw modes with framebuffers already multiples
of 32x32, and no extra modification was needed for them.

60Hz:

848x480 @ 60Hz (16:9, DMT, but using a slightly-too-short hsync)
848x480 @ 60Hz (16:9, DMT, but using a slightly-too-short hsync) - PVR 32x32
800x600 @ 60Hz (4:3, DMT, but using a slightly-too-short hsync)
800x600 @ 60Hz (4:3, DMT, but using a slightly-too-short hsync) - PVR 32x32
800x600 @ 60Hz (4:3, CVT)
800x600 @ 60Hz (4:3, CVT) - PVR 32x32
1024x768 @ 60Hz (4:3, DMT)
1024x768 @ 60Hz (4:3, DMT) - PVR 32x32
1152x864 @ 60Hz (4:3, CVT)
1152x864 @ 60Hz (4:3, CVT) - PVR 32x32
720p60 (16:9, DMT & CTA-861) - for HDTVs
720p60 (16:9, DMT & CTA-861) - for HDTVs - PVR 32x32
1280x720 (16:9, CVT) - for monitors that need this instead of HDTV 720p60
1280x720 (16:9, CVT) - for monitors that need this instead of HDTV 720p60 - PVR 32x32
1280x800 @ 60Hz (16:10, DMT & CVT)
1280x800 @ 60Hz (16:10, DMT & CVT) - PVR 32x32
1280x960 @ 60Hz (4:3, DMT) - PVR 32x32
1440x900 @ 60Hz (16:10, DMT & CVT)
1440x900 @ 60Hz (16:10, DMT & CVT) - PVR 32x32

75Hz:

640x480 @ 75Hz (4:3, DMT)
640x480 @ 75Hz (4:3, DMT) - PVR 32x32
800x600 @ 75Hz (4:3, DMT)
800x600 @ 75Hz (4:3, DMT) - PVR 32x32
1024x768 @ 75Hz (4:3, DMT) - PVR 32x32
1152x864 @ 75Hz (4:3, DMT) - PVR 32x32

120Hz (LCD Only - Untested):

480p @ 120Hz (4:3, CTA-861, 720x480) - for HDTVs - PVR 32x32
640x480 @ 120Hz (4:3, CVT, RB) - for monitors that need this instead of HDTV 480p120
640x480 @ 120Hz (4:3, CVT, RB) - PVR 32x32
800x600 @ 120Hz (4:3, DMT & CVT, RB)
1024x768 @ 120Hz (4:3, DMT & CVT, RB)

240Hz (LCD Only - Untested):

480p @ 240Hz (4:3, CTA-861, 720x480) - PVR 32x32
480p @ 239.76Hz (4:3, CTA-861, 720x480) - PVR 32x32

CVT RBv2 Native Modes (LCD Only, probably need one newer than 2013):

640x480 @ 75Hz (4:3, CVT, RBv2) - PVR 32x32
848x480 @ 60Hz (16:9, CVT, RBv2) - PVR 32x32**

** Well, ok, this one's actually 832x480 internally, but the horizontal
"stretch" is just 2%. It's the closest we can get to a real native 16:9 mode,
anyways, because the next step up is 864 wide... Which is too big for 848x480
to work. So if you're looking for a true native widescreen, this is about as
good as it gets.

https://dcemulation.org/phpBB/viewtopic ... l#p1057460