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Troubles with Tiles

Kavos · 2000-02-22T01:12:12

I'm working on tile-based top down engine here is the map drawing functions: #include "Standard.h" #define MAP_WIDTH 25 #define MAP_HEIGHT 18 #define TILE_WIDTH 32 #define TILE_HEIGHT 32 MAP_INFO map[MAP_WIDTH][MAP_HEIGHT]; RECT rcDest; // No map loading functions yet, gotta fill it with somthing void Setup_Map() { for(int i = 0; i < MAP_HEIGHT; i++) for(int j = 0; j < MAP_WIDTH; j++) map[j][ i].tile_number = 0; } void Draw_Map(int scroll_x, int scroll_y) { int tile_to_draw; for(int i = 0; i < MAP_HEIGHT; i++) for(int j = 0; j < MAP_WIDTH; j++) { rcDest.right = TILE_WIDTH * j + scroll_x; rcDest.bottom = TILE_HEIGHT * i + scroll_y; rcDest.left = rcDest.right - TILE_WIDTH; rcDest.top = rcDest.bottom - TILE_HEIGHT; tile_to_draw = map[j][ i] .tile_number; Draw_Tile(tile_to_draw); } } void Draw_Tile(int tile) { RECT rcSource; int offset_x, offset_y; if(tile < 10) { offset_x = tile * TILE_WIDTH; offset_y = 0; } rcSource.left = offset_x; rcSource.top = offset_y; rcSource.right = offset_x + TILE_WIDTH; rcSource.bottom = offset_y + TILE_WIDTH; lpDDSBack->Blt(&rcDest, lpDDSOff, &rcSource, NULL, NULL); } It works great with small maps but it really slows down when I set the map size larger. If I set my hieght and width to 100 my map array should only be 1000 bytes, the clipper should make sure Blt clips everything not being shown (if I understand it correctly) so why does it slow down. I've been basically piecing this together from info I have found on the net, Am I just missing something? Or am I just dumb... Thanx for any help you can give, -Trev Edited by - Kavos on 2/21/00 10:38:04 PM