SpritesMind.Net

Stef wrote:

Chilly Willy wrote:Unless you're using the light gun support in the controller code, then you need to use level 1, not level 3.

Not a big deal... you'll know if you're using a light gun as you need to look if they're available and then set the controller support to turn on the gun(s).

External is not level 2 ? but as we don't need it we usually set mask interrupt to 3 (so horizontal interrupt are not masked)

External IS level 2, but remember that the mask is a MASK. Just as you use level 3 to ALLOW level 4 and higher, you use level 1 to allow level 2 and higher. That simplified the interrupt hardware in the chip... when a level X int is asserted, just copy that level into the mask and you're safe! No need to make an adder circuit to put X+1 into the mask.

Stef wrote:

External IS level 2, but remember that the mask is a MASK. Just as you use level 3 to ALLOW level 4 and higher, you use level 1 to allow level 2 and higher. That simplified the interrupt hardware in the chip... when a level X int is asserted, just copy that level into the mask and you're safe! No need to make an adder circuit to put X+1 into the mask.

Yeah it's what i meant, i just misunderstood your previous post :p
We set mask to level 3 to allow H-Int (4) and V-Int (6).
If we need Ext-Int (2) then we need to set mask to level 1

lingh wrote:How should look like bmp file, to use it for font.
Char height, weight, space between char and their order.

void VDP_loadBMPTileData(const u32 *data, u16 index, u16 w, u16 h, u16 bmp_w);

bioloid wrote:Ok, going to make another demo using the SGDK, but this time with hardware usage. Since it'll mix planes/sprites & bitmap mode, is there some things to be aware of when switching modes ? (shutdown the screen, PCM music troubles, etc...). Here is a sample to show the incorrect load behavior when sending tiles.[/url]

bioloid wrote:Wow, awesome. thanks! I was sure to read somewhere bitmap mode was using 2 planes, but it was APLANE scrolling maybe, this open doors.

/**
 *      \def BMP_PLAN
 *          Plan used to draw bitmap (plan A).
 */
#define BMP_PLAN                    APLAN

About the DMA hitting PCM, I had read it in another thread, thats why I've doubt about the whole things, I'll go to the low access road as you say. Will need some test (if it creates only noise it may be acceptable).

I'm using VDP_loadBMPTileData & VDP_fillTileMapRectInc just before a "while() VDP_waitDMACompletion();" loop, maybe thing to do is call those once in first loop, or maybe there is some "screen barriers" which may be preferred.

edit: note that I use VDP_load/fill before the

Code: Select all

    SYS_setVIntCallback(vblank);
    SYS_setHIntCallback(hblank);
    VDP_setHIntCounter(1);
    VDP_setHInterrupt(1); 

will need further testing I guess.

lingh wrote:Where Genny store constant data i use, for example - describe tile positions in background, in the ram?

Code: Select all

	const u8 zone [11][16] = {
...	};

Stef wrote:

lingh wrote:Where Genny store constant data i use, for example - describe tile positions in background, in the ram?

Code: Select all

	const u8 zone [11][16] = {
...	};

By default const data are stored in rom.

    .text
/* all data from here goes in rom */

    .data
/* all data from here goes in ram */

Stef wrote:
By default const data are stored in rom.