#161420 - thesean - Sun Aug 03, 2008 4:12 am
Hey everyone,
I know this is some simple newb error but I really can't figure it out, I've tried a lot of different things... Anyway cut to the chase:
I'm trying to display a regular tile based background on the screen, but it's showing up as some garbage at the top of the screen (screenshot): http://www.atlantic7.com/temp/Clipboard01.png
The image is 256x256 px wide, being converted to 8bpp using grit with rules:
#include pallete
-p
# Tile the image
-gt
# 8-bit, 256 color
-gB8
#tile in 32x32 chunks
-Mh4
-Mw4
#perform reductions - tile flipping, etc
-mRtpf
#Map layout standard format
-mLS
But I don't think that's causing the current problem, because if I change those options, I just see different garbage, but still garbage =]
Here's my code to display the BG itself, I've also got some other BG's that I've set up, and that's where I suspect the problem is coming from. My guess is that I'm DMA'ing the data to a bad location or something but I'm too inexperienced to know for sure. For the screenshot, I commented out the other DMA calls so I can view the garbage properly.
Also, if I change the main palette's 0 color to white, the screen will show white with the garbage, so I'm fairly certain I have the background initialized properly.
Thanks for any help with this!
-thesean
Last edited by thesean on Sun Aug 03, 2008 6:12 am; edited 2 times in total
I know this is some simple newb error but I really can't figure it out, I've tried a lot of different things... Anyway cut to the chase:
I'm trying to display a regular tile based background on the screen, but it's showing up as some garbage at the top of the screen (screenshot): http://www.atlantic7.com/temp/Clipboard01.png
The image is 256x256 px wide, being converted to 8bpp using grit with rules:
#include pallete
-p
# Tile the image
-gt
# 8-bit, 256 color
-gB8
#tile in 32x32 chunks
-Mh4
-Mw4
#perform reductions - tile flipping, etc
-mRtpf
#Map layout standard format
-mLS
But I don't think that's causing the current problem, because if I change those options, I just see different garbage, but still garbage =]
Here's my code to display the BG itself, I've also got some other BG's that I've set up, and that's where I suspect the problem is coming from. My guess is that I'm DMA'ing the data to a bad location or something but I'm too inexperienced to know for sure. For the screenshot, I commented out the other DMA calls so I can view the garbage properly.
| Code: |
|
void init() { srand(22); //set the seed (sew the seed?) // enable vblank irq for swiWaitForVBlank irqInit(); irqEnable(IRQ_VBLANK); vramSetMainBanks(VRAM_A_MAIN_BG_0x06000000, VRAM_B_MAIN_BG_0x06020000, VRAM_C_SUB_BG_0x06200000, VRAM_D_LCD ); vramSetBankE(VRAM_E_MAIN_SPRITE); videoSetMode(MODE_5_2D | // Set the graphics mode to Mode 5 DISPLAY_BG2_ACTIVE | // Enable BG2 for display DISPLAY_BG3_ACTIVE | // Enable BG3 for display DISPLAY_SPR_ACTIVE | // Enable sprites for display DISPLAY_SPR_1D // Enable 1D tiled sprites ); // screen for console output and bitmap // bg0 = console, bg3 = bitmap // mode 5 allows extended BGs videoSetModeSub( MODE_5_2D | DISPLAY_BG0_ACTIVE | DISPLAY_BG3_ACTIVE); powerON(POWER_ALL_2D); //turn on 2d graphics core consoleInitDefault((u16*)SCREEN_BASE_BLOCK_SUB(2), (u16*)CHAR_BASE_BLOCK_SUB(0), 16); lcdMainOnBottom(); // set console font colour BG_PALETTE_SUB[255] = RGB15(7,15,31); } void setupBackgrounds() { //setup backgrounds: //priorities: 3 is low, 2 is med, 1 is upper, 0 is highest BG3_CR = BG_BMP16_256x256 | BG_BMP_BASE(0) | BG_PRIORITY(3) | BG_WRAP_ON; BG3_XDX = 1 << 8; BG3_XDY = 0; BG3_YDX = 0; BG3_YDY = 1 << 8; //background at origin BG3_CX = 0; BG3_CY = 0; // setup bg3 control // SUB_BG3_CR is the register that controls BG3's behavior on the sub-display // this is the top screen background SUB_BG3_CR = BG_BMP16_256x256 | BG_BMP_BASE(0) | BG_PRIORITY(2) | BG_WRAP_ON; // identity matrix SUB_BG3_XDX = 1 << 8; SUB_BG3_XDY = 0; SUB_BG3_YDX = 0; SUB_BG3_YDY = 1 << 8; //1<<8 = 256 // scroll the bg past the section used by the console SUB_BG3_CY = 16 << 8; // CY is a fixed point number, 16*256 = 16.0 pixels // the character tiles will occupy map bases 0 and 1 // setup the console bg to map base 2 // BG0 already has higher priority than BG3, so no need to mess with that stuff. SUB_BG0_CR = BG_MAP_BASE( 2 ); //first attempt at tilemap usage using bg CR 2 //old try - //BG2_CR = BG_64x64 | BG_BMP_BASE(8) | BG_PRIORITY(2) | BG_TILE_BASE(1) | BG_COLOR_256; // A higher priority BG2_CR = BG_TILE_BASE(0) | BG_MAP_BASE(8) | BG_COLOR_256 | TEXTBG_SIZE_256x256 | BG_PRIORITY(2); BG2_XDX = 1 << 8; BG2_XDY = 0; BG2_YDX = 0; BG2_YDY = 1 << 8; //start the regular tile background at origin BG2_CX = 0; BG2_CY = 0; // use dma to copy the tile, map and palette data to VRAM dmaCopyHalfWords(DMA_CHANNEL, testmapPal, BG_PALETTE, testmapPalLen); dmaCopyHalfWords(DMA_CHANNEL, testmapTiles, (uint16 *)BG_TILE_RAM(0), testmapTilesLen); dmaCopyHalfWords(DMA_CHANNEL, testmapMap, (uint16 *)BG_MAP_RAM(8), testmapMapLen); //BG_PALETTE[0] = 0xFFFF; //copy the backgrounds in to MM //dmaCopyHalfWords(DMA_CHANNEL, botbgBitmap, (uint16 *) BG_BMP_RAM(0), botbgBitmapLen); //main //dmaCopyHalfWords(DMA_CHANNEL, testmapTiles, (uint16 *)BG_BMP_RAM(6), testmapBitmapLen);//main //dmaCopyHalfWords(DMA_CHANNEL, topbgBitmap, (uint16 *)BG_BMP_RAM_SUB(0)+(4*1024), topbgBitmapLen); //sub + 4 KB from console //sanity checks... assert(BG_BMP_BASE(2) == BG_MAP_BASE(2)); assert(BG_TILE_RAM(2) == BG_BMP_RAM(2)); assert(BG_MAP_RAM(2) == SCREEN_BASE_BLOCK(2)); //assert(BG_BMP_RAM(4) == BG_MAP_RAM(4)); -- fails!! //tile ram == char base block == bg_bmp_ram assert(BG_TILE_RAM(6) == CHAR_BASE_BLOCK(6)); assert(BG_BMP_RAM(6) == CHAR_BASE_BLOCK(6)); } init(); setupBackgrounds(); |
Also, if I change the main palette's 0 color to white, the screen will show white with the garbage, so I'm fairly certain I have the background initialized properly.
Thanks for any help with this!
-thesean
Last edited by thesean on Sun Aug 03, 2008 6:12 am; edited 2 times in total