added more speeds to paralax scrolling layer

added parallax scrolling to demo screen
2026-05-13 00:28:13 -05:00 · 2026-05-12 23:57:28 -05:00
11 changed files with 439 additions and 302 deletions
--- a/out/res/resources.d
+++ b/out/res/resources.d
@@ -1,3 +1,5 @@
 out/res/resources.o: res/resources.res \
 C:/Users/ttibb/Dev/SGDK-Game/res/background1.png \
 C:/Users/ttibb/Dev/SGDK-Game/res/btwade_bg1_1.png \
 C:/Users/ttibb/Dev/SGDK-Game/res/btwade_bg2_1.png \
 C:/Users/ttibb/Dev/SGDK-Game/res/Sprites/BTW-1.png
--- a/out/res/resources.o
+++ b/out/res/resources.o
--- a/out/rom.bin
+++ b/out/rom.bin
--- a/out/rom.out
+++ b/out/rom.out
--- a/out/src/Main.o
+++ b/out/src/Main.o
--- a/out/symbol.txt
+++ b/out/symbol.txt
@@ -6,8 +6,11 @@
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@@ -15,7 +18,7 @@
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-e0ff0262 b planeHeight
+e0ff029e b lastVTimer.0
-e0ff0264 b planeWidth
+e0ff02a0 b text_plan
-e0ff0266 b hscrl_addr
+e0ff02a4 b text_basetile
-e0ff0268 b bgb_addr
+e0ff02a6 b lastVCnt
-e0ff026a b bga_addr
+e0ff02a8 b windowWidthSft
-e0ff026c b window_addr
+e0ff02aa b planeWidthSft
-e0ff026e b lastTick
+e0ff02ac b windowWidth
-e0ff0272 b cpuFrameLoad
+e0ff02ae b planeHeight
-e0ff0274 b frameLoadIndex
+e0ff02b0 b planeWidth
-e0ff0276 b frameLoads
+e0ff02b2 b hscrl_addr
-e0ff0286 b vblankCB
+e0ff02b4 b bgb_addr
-e0ff028a b flags
+e0ff02b6 b bga_addr
-e0ff028c b screenHeight
+e0ff02b8 b window_addr
-e0ff028e b screenWidth
+e0ff02ba b lastTick
-e0ff0290 b maps_addr
+e0ff02be b cpuFrameLoad
-e0ff0292 b slist_addr
+e0ff02c0 b frameLoadIndex
-e0ff0294 b vdpSpriteCache
+e0ff02c2 b frameLoads
-e0ff0594 b spriteVramSize
+e0ff02d2 b vblankCB
-e0ff0598 b vram
+e0ff02d6 b flags
-e0ff05a4 b lastSprite
+e0ff02d8 b screenHeight
-e0ff05a8 b firstSprite
+e0ff02da b screenWidth
-e0ff05ac b spritesPool
+e0ff02dc b maps_addr
-e0ff05b0 b fadeCounter
+e0ff02de b slist_addr
-e0ff05b2 b heap
+e0ff02e0 b vdpSpriteCache
-e0ff05b6 b free.lto_priv.0
+e0ff05e0 b spriteVramSize
-e0ff05ba b randomSeedSet
+e0ff05e4 b vram
-e0ff05bc b joyEventCB
+e0ff05f0 b lastSprite
-e0ff05c0 b retry
+e0ff05f4 b firstSprite
-e0ff05c1 b phase.lto_priv.1
+e0ff05f8 b spritesPool
-e0ff05c2 b gun
+e0ff05fc b fadeCounter
-e0ff05c3 b extSet
+e0ff05fe b heap
-e0ff05c4 b disableIntStack
+e0ff0602 b free.lto_priv.0
-e0ff05c6 b joyAxisY
+e0ff0606 b randomSeedSet
-e0ff05d6 b joyAxisX
+e0ff0608 b joyEventCB
-e0ff05e6 b joyState
+e0ff060c b retry
-e0ff05f6 b portSupport
+e0ff060d b phase.lto_priv.1
-e0ff05f8 b portType
+e0ff0610 b regValues
-e0ff05fa b gport
+e0ff0623 b gun
-e0ff05fc b regValues
+e0ff0624 b extSet
-e0ff0610 b flag
+e0ff0626 b disableIntStack
-e0ff0612 b maxTransferPerFrame
+e0ff0628 b joyAxisY
-e0ff0614 b queueSize
+e0ff0638 b joyAxisX
-e0ff0616 b nextDataBuffer
+e0ff0648 b joyState
-e0ff061a b queueTransferSize
+e0ff0658 b joyType
-e0ff061c b queueIndexLimit
+e0ff0660 b portSupport
-e0ff061e b queueIndex
+e0ff0662 b portType
-e0ff0620 b dmaDataBuffer
+e0ff0664 b gport
-e0ff0624 b dataBufferSize
+e0ff0666 b flag
-e0ff0626 b phase.lto_priv.0
+e0ff0668 b maxTransferPerFrame
-e0ff0628 b joyType
+e0ff066a b queueSize
-e0ff0630 b buttonString
+e0ff066c b nextDataBuffer
-e0ff0634 b debugString
+e0ff0670 b queueTransferSize
-e0ff0684 B _bend
+e0ff0672 b queueIndexLimit
 e0ff0674 b queueIndex
 e0ff0676 b dmaDataBuffer
 e0ff067a b dataBufferSize
 e0ff067c b phase.lto_priv.0
 e0ff067e B _bend
 e1000000 A __stack
--- a/res/btwade_bg1_1.png
+++ b/res/btwade_bg1_1.png
--- a/res/btwade_bg2_1.png
+++ b/res/btwade_bg2_1.png
--- a/res/resources.h
+++ b/res/resources.h
@@ -3,7 +3,9 @@
 #ifndef _RES_RESOURCES_H_
 #define _RES_RESOURCES_H_
-extern const Image bg1;
+extern const Image bgtest;
 extern const SpriteDefinition bigTex1;
 extern const Image bg1;
 extern const Image fg1;
 #endif // _RES_RESOURCES_H_
--- a/res/resources.res
+++ b/res/resources.res
@@ -1,2 +1,4 @@
-IMAGE bg1 "background1.png" BEST ALL 
+IMAGE bgtest "background1.png" BEST ALL 
 SPRITE  bigTex1 "Sprites\BTW-1.png" 8 8 FAST 
 IMAGE bg1 "btwade_bg1_1.png" BEST ALL 
 IMAGE fg1 "btwade_bg2_1.png" BEST ALL 
--- a/src/Main.c
+++ b/src/Main.c
@@ -5,6 +5,24 @@ char debugString[80];
 char* buttonString;
 char* clearString = "                     ";
 Sprite* player;
 int player_x;
 int player_y;
 bool player_hflip;
 int scrollFrameDelay = 0;
 int scrollFrameDelayHalved = 0;
 s16 tile_scroll_array [28] = {
    0,0,0,0,0,
    0,0,0,0,0,
    0,0,0,0,0,
    0,0,0,0,0,
    0,0,0,0,0,
    0,0,0
 };
 void myJoyHandler( u16 joy, u16 changed, u16 state)
 {
@@ -56,6 +74,23 @@ void myJoyHandler( u16 joy, u16 changed, u16 state)
            strcat(debugString,  " Z ");
        }
        if(state & BUTTON_DOWN){
            player_y += 1;
        }
        if(state & BUTTON_UP){
             player_y -= 1;
        } 
        if(state & BUTTON_LEFT){
            player_x -= 1;
            player_hflip = false;
        }
        if(state & BUTTON_RIGHT){
            player_x += 1;
            player_hflip = true;
        }
        if ((strlen(debugString) == 0)){
             strcpy(debugString, "None");
        }
@@ -63,39 +98,111 @@ void myJoyHandler( u16 joy, u16 changed, u16 state)
 	}	
 }
 static void handleInputs(){
    u16 value = JOY_readJoypad(JOY_1);
    if (value & BUTTON_RIGHT){
         player_x += 1;
         player_hflip = true;
    }
      if (value & BUTTON_LEFT){
         player_x -= 1;
         player_hflip = false;
    }
      if (value & BUTTON_UP){
         player_y -= 1;
    }
      if (value & BUTTON_DOWN){
         player_y += 1;
    }
 }
 int main(bool hard)
 {
    player_x = 50;
    player_y = 50;
    JOY_init();
-	JOY_setEventHandler( &myJoyHandler );
+	//JOY_setEventHandler( &myJoyHandler);
    u16 ind = TILE_USER_INDEX;
    SPR_init();
    PAL_setPalette(PAL0, bg1.palette->data, DMA);
    PAL_setPalette(PAL1,fg1.palette->data,DMA);
    PAL_setPalette(PAL2, bigTex1.palette->data, DMA);
    player = SPR_addSprite(&bigTex1, 0,0, TILE_ATTR(PAL2,false,false,false));
-    VDP_drawImageEx(BG_B, &bg1,TILE_ATTR_FULL(PAL0, false, false, false, ind), 0, 0, false, true);
+    VDP_drawImageEx(BG_B, &bg1,TILE_ATTR_FULL(PAL0, false, false, false, ind), 0, -4, false, true);
    ind += bg1.tileset->numTile;
    VDP_drawImageEx(BG_A, &fg1,TILE_ATTR_FULL(PAL1, false, false, false, ind), 0, -4, false, true);
    ind += fg1.tileset->numTile;
    VDP_setScrollingMode(HSCROLL_TILE,VSCROLL_PLANE);
    while(TRUE)
    {
-         VDP_drawImageEx(BG_B, &bg1,TILE_ATTR_FULL(PAL0, false, false, false, ind), 0, 0, false, true);
+        handleInputs();
         //VDP_drawImageEx(BG_B, &bg1,TILE_ATTR_FULL(PAL0, false, false, false, ind), 0, 0, false, true);
         SPR_setPosition(player, player_x,player_y);
         SPR_setHFlip(player, player_hflip);
         SPR_update();
        // read input
        // move sprite
        // update score
        // draw current screen (logo, start screen, settings, game, gameover, credits...)
        VDP_drawText(clearString, 2, 5);
        VDP_drawText(buttonString, 2, 5);
-        VDP_drawText(clearString, 14, 13);
+        if (scrollFrameDelay > 1){
-        VDP_drawText(debugString, 14, 13);
+            scrollFrameDelay = 0;
            if (scrollFrameDelayHalved >1){
                //0.25 scroll speed
                tile_scroll_array[15] -=1;
                tile_scroll_array[16] -=1;
                tile_scroll_array[17] -=1;               
                tile_scroll_array[18] -=1;                
                tile_scroll_array[19] -=1; 
                //reset this timer
                scrollFrameDelayHalved = 0;
            }
            // 0.5 scroll speed
            tile_scroll_array[20] -=1;
            // effectively 1.5 scroll speed.
            tile_scroll_array[22] -=1;
            // 2.5
            tile_scroll_array[25] -=1;  
            scrollFrameDelayHalved ++;  
        }
        tile_scroll_array[21] -=1; 
        tile_scroll_array[22] -=1; //1.5
        tile_scroll_array[23] -=2; 
        tile_scroll_array[24] -=2;
        tile_scroll_array[25] -=2; // 2.5 
        tile_scroll_array[26] -=3;
        tile_scroll_array[27] -=3; 
        VDP_setHorizontalScrollTile(BG_A, 0, tile_scroll_array, 28, DMA_QUEUE);
        scrollFrameDelay ++;
        // wait for screen refresh and do all SGDK VBlank tasks
        SYS_doVBlankProcess();
Author	SHA1	Message	Date
tibz	d1e7a2e605	added more speeds to paralax scrolling layer	2026-05-13 00:28:13 -05:00
tibz	9311dd423b	added parallax scrolling to demo screen	2026-05-12 23:57:28 -05:00