mirror of
https://github.com/knightfox75/nds_nflib.git
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146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
// SPDX-License-Identifier: CC0-1.0
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//
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// SPDX-FileContributor: NightFox & Co., 2009-2011
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//
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// Water reflection effect (with scroll).
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// http://www.nightfoxandco.com
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#include <stdio.h>
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#include <nds.h>
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#include <filesystem.h>
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#include <nf_lib.h>
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// Wave effect variables
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u16 mapa[32][24]; // Map
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s16 bgx[192]; // X scroll of each line
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s8 i[192]; // Movement control of each line
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// Background control variables
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s16 bg_x[4];
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// Function that runs after a scanline is drawn. By modifying the values of the
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// scroll registers it's possible to add a wave effect.
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void hblank_handler(void)
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{
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u32 vline = REG_VCOUNT; // Get the current line
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if ((vline >= 138) && (vline <= 159))
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{
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// If the current line is between 138 and 159, apply effect to layer 1
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bgx[vline] += i[vline];
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if ((bgx[vline] < 1) || (bgx[vline] > 63))
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i[vline] *= -1;
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NF_ScrollBg(0, 1, bg_x[1] + ((bgx[vline] / 8) - 4), 0);
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}
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if ((vline >= 160) && (vline <= 191))
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{
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// If the current line is between 160 and 191, apply effect to layer 0
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bgx[vline] += i[vline];
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if ((bgx[vline] < 1) || (bgx[vline] > (vline - 156)))
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i[vline] *= -1;
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NF_ScrollBg(0, 0, bg_x[0] + (((vline - 156) / 2) - bgx[vline]), 0);
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}
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}
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int main(int argc, char **argv)
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{
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// Prepare a NitroFS initialization screen
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NF_Set2D(0, 0);
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NF_Set2D(1, 0);
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consoleDemoInit();
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printf("\n NitroFS init. Please wait.\n\n");
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printf(" Iniciando NitroFS,\n por favor, espere.\n\n");
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swiWaitForVBlank();
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// Initialize NitroFS and set it as the root folder of the filesystem
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nitroFSInit(NULL);
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NF_SetRootFolder("NITROFS");
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// Initialize 2D engine in both screens and use mode 0
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NF_Set2D(0, 0);
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NF_Set2D(1, 0);
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// Initialize tiled backgrounds system
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NF_InitTiledBgBuffers(); // Initialize storage buffers
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NF_InitTiledBgSys(0); // Top screen
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NF_InitTiledBgSys(1); // Bottom screen
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// Load background files from NitroFS
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NF_LoadTiledBg("bg/layer0", "layer0", 512, 256);
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NF_LoadTiledBg("bg/layer1", "layer1", 512, 256);
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NF_LoadTiledBg("bg/layer2", "layer2", 512, 256);
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NF_LoadTiledBg("bg/layer3", "layer3", 512, 256);
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NF_LoadTiledBg("bg/nfl", "nfl", 256, 256);
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// Create top screen backgrounds
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NF_CreateTiledBg(0, 3, "layer3");
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NF_CreateTiledBg(0, 2, "layer2");
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NF_CreateTiledBg(0, 1, "layer1");
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NF_CreateTiledBg(0, 0, "layer0");
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// Create bottom screen backgrounds
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NF_CreateTiledBg(1, 3, "nfl");
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// Initialize wave effect
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s16 y = 0;
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s8 inc = 1;
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for (y = 138; y < 192; y++)
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{
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// Layer 1 calculations
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if ((y >= 138) && (y <= 159))
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{
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bgx[y] = 32;
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inc *= -1;
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i[y] = inc;
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}
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// Layer 0 calculations
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if ((y >= 160) && (y <= 191))
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{
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bgx[y] = (y - 156) / 2;
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i[y] = inc;
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inc *= -1;
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}
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}
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// Register a function to be called after a screen line has been drawn (when
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// the horizontal blanking period starts)
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irqSet(IRQ_HBLANK, hblank_handler);
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irqEnable(IRQ_HBLANK);
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while (1)
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{
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scanKeys(); // Read keypad
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u16 keys = keysHeld(); // Keys currently pressed
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// Move background
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if ((keys & KEY_LEFT) && (bg_x[0] > 8))
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bg_x[0]--;
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if ((keys & KEY_RIGHT) && (bg_x[0] < 247))
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bg_x[0]++;
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// Calculate parallax
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bg_x[1] = bg_x[0] / 1.5;
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bg_x[2] = bg_x[1] / 1.5;
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bg_x[3] = bg_x[2] / 1.5;
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// Wait for the screen refresh
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swiWaitForVBlank();
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// Scroll all backgrounds
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NF_ScrollBg(0, 3, bg_x[3], 0);
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NF_ScrollBg(0, 2, bg_x[2], 0);
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NF_ScrollBg(0, 1, bg_x[1], 0);
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NF_ScrollBg(0, 0, bg_x[0], 0);
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}
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return 0;
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}
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