; hsp3dish + fullscreen test. move stars.
    ;
    ; Windows10 x64 22H2 + HSP 3.7beta7
    ; 2023/11/01 by mieki256
    ; Licence : CC0 / Public Domain
    
    #include "hsp3dish.as"
    #include "d3m.hsp"
    
    #packopt name "fullscreen_zoom"
    #packopt type 0
    
    #define TEX_FILE    "star.png"
    ; #define TEX_FILE    "star2.png"
    #pack   TEX_FILE
    
    #define KB_ESC      $000080
    #define FRAMERATE   60
    
    fps_display_enable = 1
    
    ; get desktop size
    dispw = ginfo_dispx
    disph = ginfo_dispy
    
    ; initialize window without frame
    ; bgscr WindowID, width, height, mode, x, y
    bgscr 0, dispw, disph, 0, 0, 0
    
    ; load image
    imgid = 3
    celload TEX_FILE, imgid

    ; split image. set orign
    celdiv imgid, 512, 512, 256, 256

    ; Set the buffer to draw from. Windows ID 0
    gsel 0, 1
    
    ; Set screen clear color to be performed when redraw 0 is called.
    ; 0 or 1, color ($000000 - $ffffff)
    ; setcls CLSMODE_SOLID, $4080c0
    setcls CLSMODE_SOLID, $000000
    
    font "Tahoma", 24, 1
    
    randomize
    
    star_size = 0.75
    dist = 150.0        ; screen distabce
    area_z = 5000
    zmax = double(area_z) + dist
    
    ; rnd() only accepts 1 to 32768.
    ; adjust the value to stay within that range.
    area_m = 4.0
    area_w = int((double(dispw) * zmax) / dist / area_m)
    area_h = int((double(disph) * zmax) / dist / area_m)
    
    objmax = 512
    
    ; initialize stars work
    ddim posx, objmax       ; position x
    ddim posy, objmax       ; position y
    ddim posz, objmax       ; position z
    dim px, objmax          ; display position x
    dim py, objmax          ; display position y
    ddim scalev, objmax     ; scale
    dim alpha, obj_max      ; alpha value
    repeat objmax
        gosub *get_newpos_xy
        posx(cnt) = nx
        posy(cnt) = ny
        posz(cnt) = double(rnd(area_z)) + dist
        px(cnt) = 0
        py(cnt) = 0
        scale(cnt) = 0.0
        alpha(cnt) = 0
    loop
    
    time_start = d3timer()
    endfg = 0
    
; ----------------------------------------
*mainloop
    while endfg == 0
        tm = d3timer() - time_start
        fps = d3getfps()                ; get FPS
        
        ; ESC key to exit
        stick key, 0
        if key & KB_ESC : endfg = 1
        
        ; move stars
        spd = 40.0
        repeat objmax
            posz(cnt) -= spd
            if posz(cnt) < (dist / 2.0) {
                posz(cnt) += zmax
                gosub *get_newpos_xy
                posx(cnt) = nx
                posy(cnt) = ny
            }
            
            ; get display x, y position
            px(cnt) = int(posx(cnt) * dist / posz(cnt)) + (dispw / 2)
            py(cnt) = int(posy(cnt) * dist / posz(cnt)) + (disph / 2)
            scalev(cnt) = star_size * dist / posz(cnt)
            
            size = int(512.0 * scalev(cnt))
            x0 = px(cnt) - (size / 2)
            y0 = py(cnt) - (size / 2)
            x1 = px(cnt) + (size / 2)
            y1 = py(cnt) + (size / 2)
            if x1 < 0 or x0 > dispw or y1 < 0 or y0 > disph {
                ; out of display area. position reset
                posz(cnt) += zmax
                gosub *get_newpos_xy
                posx(cnt) = nx
                posy(cnt) = ny
                px(cnt) = int(posx(cnt) * dist / posz(cnt)) + (dispw / 2)
                py(cnt) = int(posy(cnt) * dist / posz(cnt)) + (disph / 2)
                scalev(cnt) = star_size * dist / posz(cnt)
            }
            
            ; get alpha value
            az = double(area_z) * 0.7
            if posz(cnt) < az {
                alpha(cnt) = 255
            } else {
                ; fade in
                z = posz(cnt)
                if z > zmax : z = zmax
                v0 = z - az
                v1 = zmax - az
                alpha(cnt) = int(255.0 - (255.0 * v0 / v1))
            }
        loop
        
        ; ----------------------------------------
        ; draw start
        redraw 0
        
        ; clear screen
        ; color 64, 128, 192
        ; boxf
        
        ; draw stars
        repeat objmax
            rot = 0.0
            idx = 0
            
            ; draw image by celput
            gmode gmode_add, 512, 512, alpha(cnt)
            pos px(cnt), py(cnt)
            rot = 0.0
            idx = 0
            celput imgid, idx, scalev(cnt), scalev(cnt), rot
        loop

        ; draw text
        if fps_display_enable {
            gmode gmode_rgb0
            color 255, 255, 255
            pos 10, 10
            mes strf("[%dx%d] %d/%dFPS", dispw, disph, fps, FRAMERATE)
        }
        
        ; draw end. screen refersh
        redraw 1
        
        await (1000 / FRAMERATE)
        ; await 12
    wend
    
*jobend:
    end
    
*get_newpos_xy
    nx = double(rnd(area_w) - (area_w / 2)) * area_m
    ny = double(rnd(area_h) - (area_h / 2)) * area_m
    return