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Swap VDP2 layers

paul_met - Dec 27, 2016

		paul_met	Dec 27, 2016
		Does anyone know how to swap layers of vdp2? For example, we have a title screen, where NBG2 layer is responsible for the background image, and NBG1 layer is responsible for the logo. I want to do opposite - NBG2 layer a became a logo and NBG1 layer became background image. How do the images are relating for certain layers of VDP2 generally? I do not find anything similar information in VDP2 documentation.

		vbt	Dec 27, 2016
		you can change priorities instead of swapping layers

		paul_met	Jan 9, 2017
		I know about this, but the priority in my case is not suitable. Swapping layers required in order to do that I needed a scalable layer.

		vbt	Jan 10, 2017
		then you must swap nbg config and modify cycle patterns, also depending on lyers you can't do the same thing, nbg0 & nbg1 support more stuff. on sbl it looks like this : Uint16 CycleTb[]={ 0x1f56, 0xffff, //A0 0xffff, 0xffff, //A1 0xf5f2,0x4eff, //B0 0xffff, 0xffff //B1 // 0x4eff, 0x1fff, //B1 }; SclConfig scfg; // 3 nbg scfg.dispenbl = ON; scfg.charsize = SCL_CHAR_SIZE_1X1;//OK du 1*1 surtout pas toucher scfg.pnamesize = SCL_PN2WORD; //2word scfg.platesize = SCL_PL_SIZE_1X1; // ou 2X2 ? scfg.coltype = SCL_COL_TYPE_16;//SCL_COL_TYPE_256; scfg.datatype = SCL_CELL; scfg.flip = SCL_PN_10BIT; // on force à 0 scfg.plate_addr[0] = (Uint32)SS_MAP2; scfg.plate_addr[1] = 0x00; SCL_SetConfig(SCL_NBG1, &scfg); // 3 nbg scfg.platesize = SCL_PL_SIZE_2X2; // ou 2X2 ? scfg.plate_addr[0] = (Uint32)SS_MAP; scfg.plate_addr[1] = (Uint32)SS_MAP; scfg.plate_addr[2] = (Uint32)SS_MAP; scfg.plate_addr[3] = (Uint32)SS_MAP; SCL_SetConfig(SCL_NBG2, &scfg);