Background image not convering entire screen

[Maximo Virgolini]

Hello, I just start porgraming for atari jaguar using jagstudio, in c, currently i just want to display an image, this is the code

 

this is the rapinit.s code

 

	dc.l	1								; (REPEAT COUNTER) 				; Create this many objects of this type (or 1 for a single object)
	dc.l	is_active						; sprite_active					; sprite active flag
	dc.w	0,0							; sprite_x						; 16.16 x value to position at
	dc.w	0,0							; sprite_y						; 16.16 y value to position at
	dc.w	0,0								; sprite_xadd					; 16.16 x addition for sprite movement
	dc.w	0,0								; sprite_yadd					; 16.16 y addition for sprite movement
	dc.l	320								; sprite_width					; width of sprite (in pixels)
	dc.l	200								; sprite_height					; height of sprite (in pixels)
	dc.l	is_normal						; sprite_flip					; flag for mirroring data left<>right
	dc.l	0								; sprite_coffx					; x offset from center for collision box center
	dc.l	0								; sprite_coffy					; y offset from center for collision box center	
	dc.l	32/2							; sprite_hbox					; width of collision box
	dc.l	5/2								; sprite_vbox					; height of collision box
	dc.l	back5						; sprite_gfxbase				; start of bitmap data
	dc.l	16								; (BIT DEPTH)					; bitmap depth (1/2/4/8/16/24)
	dc.l	is_RGB							; (CRY/RGB)						; bitmap GFX type
	dc.l	is_trans						; (TRANSPARENCY)				; bitmap TRANS flag
	dc.l	320*200*2							; sprite_framesz				; size per frame in bytes of sprite data
	dc.l	320*2							; sprite_bytewid				; width in bytes of one line of sprite data
	dc.l	0								; sprite_animspd				; frame delay between animation changes
	dc.l	0								; sprite_maxframe				; number of frames in animation chain
	dc.l	ani_rept						; sprite_animloop				; repeat or play once
	dc.l	edge_ignore						; sprite_wrap					; wrap on screen exit, or remove
	dc.l	spr_inf							; sprite_timer					; frames sprite is active for (or spr_inf)
	dc.l	spr_linear						; sprite_track					; use 16.16 xadd/yadd or point to 16.16 x/y table
	dc.l	0								; sprite_tracktop				; pointer to loop point in track table (if used)
	dc.l	spr_unscale						; sprite_scaled					; flag for scaleable object
	dc.l	%00100000						; sprite_scale_x				; x scale factor (if scaled)
	dc.l	%00100000						; sprite_scale_y				; y scale factor (if scaled)
	dc.l	-1								; sprite_was_hit				; initially flagged as not hit
	dc.l	0								; sprite_CLUT					; no_CLUT (8/16/24 bit) or CLUT (1/2/4 bit)
	dc.l	can_hit							; sprite_colchk					; if sprite can collide with another
	dc.l	cd_keep							; sprite_remhit					; flag to remove (or keep) on collision
	dc.l	single							; sprite_bboxlink				; single for normal bounding box, else pointer to table
	dc.l	1								; sprite_hitpoint				; Hitpoints before death
	dc.l	2								; sprite_damage					; Hitpoints deducted from target
	dc.l	320*2							; sprite_gwidth					; GFX width (of data)	

 

background is bmp image 16 bits depth, 320 x 200

virtual jaguar output this image

 

 

I assume that i need to tweak  spr_unscale values, is that so?

[OVERRiDE]

Try 352x240 pixel background image...clearly your image is displayed correctly, it just doesn't cover the entire screen.

 

BTW I would have assumed a 320x240 screen but it does seem JagStudio is closer to 352x240 by default.

 

@CyranoJCyranoJ can we adjust the display resolution?  Is something like 640x480 possible?  I know the Jag has programmable video modes, just not sure how much of this is exposed.

[+CyranoJ]

That looks correct for what you have show.  The screen area is more like 352x240.

 

You can adjust the PWIDTH bits in VMODE to change the horizontal width.  Everything should still work except edge detection.

[Maximo Virgolini]

thanks to all, screen area is effectly 352*240