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93 lines
3.6 KiB
Lua
93 lines
3.6 KiB
Lua
; Viewer program for BMX image files.
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; BMX file format: see https://cx16forum.com/forum/viewtopic.php?t=6945
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%import textio
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%import palette
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%import bmx
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%option no_sysinit
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%zeropage basicsafe
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main {
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sub start() {
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str filename = "?"*40
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repeat {
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txt.print("\nenter bmx image filename: ")
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if txt.input_chars(&filename)!=0 {
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if bmx.open(8, filename) {
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txt.print("\nsize: ")
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txt.print_uw(bmx.width)
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txt.chrout('*')
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txt.print_uw(bmx.height)
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txt.print(" bpp: ")
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txt.print_uw(bmx.bitsperpixel)
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txt.print(" num colors: ")
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txt.print_uw(bmx.palette_entries)
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txt.nl()
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sys.wait(100)
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; tell the loader to put the palette into system memory instead
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; also make palette black at first, to hide loading (even though it is very fast)
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; (you could do a soft fade-in effect with this for instance)
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bmx.palette_buffer_ptr = memory("palette", 512, 0)
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sys.memset(bmx.palette_buffer_ptr, 512, 0)
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palette.set_rgb(bmx.palette_buffer_ptr, 256)
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; switch to bitmap screen mode and color depth: 320*240
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void cx16.screen_mode($80, false) ; we're lazy and just use a kernal routine to set up the basics
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cx16.VERA_L0_CONFIG = cx16.VERA_L0_CONFIG & %11111100 | bmx.vera_colordepth
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; now load the image
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if bmx.width==320 {
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; can use the fast, full-screen load routine
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if bmx.continue_load(0, 0) {
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if bmx.height<240 {
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; fill the remaining bottom part of the screen
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cx16.GRAPH_set_colors(bmx.border, bmx.border, 99)
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cx16.GRAPH_draw_rect(0, bmx.height, 320, 240-bmx.height, 0, true)
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}
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activate_palette()
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void txt.waitkey()
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}
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} else {
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; clear the screen with the border color
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cx16.GRAPH_set_colors(0, 0, bmx.border)
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cx16.GRAPH_clear()
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; need to use the slower load routine that does padding
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; center the image on the screen nicely
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uword offset = (320-bmx.width)/2 + (240-bmx.height)/2*320
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if bmx.continue_load_stamp(0, offset, 320) {
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activate_palette()
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void txt.waitkey()
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}
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}
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}
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cbm.CINT() ; reset screen
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if bmx.error_message!=0 {
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txt.print("load error:\n")
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txt.print(bmx.error_message)
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txt.nl()
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sys.wait(120)
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}
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}
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}
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}
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sub activate_palette() {
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; copies the pallette data from the memory buffer into vram
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cx16.VERA_DC_BORDER = bmx.border
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cx16.r1 = bmx.palette_buffer_ptr
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cx16.r2L = bmx.palette_start
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cx16.r3L = lsb(bmx.palette_entries)
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do {
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palette.set_color(cx16.r2L, peekw(cx16.r1))
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cx16.r1+=2
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cx16.r2L++
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cx16.r3L--
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} until cx16.r3L==0
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}
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}
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