mirror of
https://github.com/KarolS/millfork.git
synced 2024-06-01 09:41:36 +00:00
133 lines
2.8 KiB
Plaintext
133 lines
2.8 KiB
Plaintext
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#if VERA_VERSION != 9
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#error Unsupported VERA_VERSION
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#endif
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const int24 VERA_PALETTE = $1FA00
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const int24 VERA_SPRITES = $1FC00
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volatile byte vera_addr_lo @ $9f20
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volatile byte vera_addr_mi @ $9f21
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volatile byte vera_addr_hi @ $9f22
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volatile int24 vera_addr @ $9f20
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volatile byte vera_data0 @ $9f23
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volatile byte vera_data1 @ $9f24
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volatile byte vera_ctrl @ $9f25
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volatile byte vera_ien @ $9f26
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volatile byte vera_isr @ $9f27
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volatile byte vera_irqline @ $9f28
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volatile byte vera_dc_video_hstart @ $9f29
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volatile byte vera_dc_hscale_hstop @ $9f29
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volatile byte vera_dc_vscale_vstart @ $9f2b
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volatile byte vera_dc_border_vstop @ $9f2c
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struct vera_layer_setup {
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byte config
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byte map_base
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byte tile_base
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word hscroll
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word vscroll
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}
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volatile vera_layer_setup vera_layer0 @$9F2D
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volatile vera_layer_setup vera_layer1 @$9F34
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inline void vera_poke(int24 address, byte value) {
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vera_ctrl = 0
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vera_addr = address
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vera_data0 = value
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}
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inline byte vera_peek(int24 address) {
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vera_ctrl = 0
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vera_addr = address
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return vera_data0
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}
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inline void vera_fill(int24 address, byte value, word size) {
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word i
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vera_addr_lo = address.b0
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vera_addr_mi = address.b1
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vera_addr_hi = address.b2 | $10
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vera_ctrl = 0
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for i,0,paralleluntil,size {
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vera_data0 = value
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}
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}
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void vera_upload_large(int24 address, pointer source, word size) {
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word i
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vera_ctrl = 0
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vera_addr_lo = address.b0
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vera_addr_mi = address.b1
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vera_addr_hi = address.b2 | $10
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for i,0,paralleluntil,size {
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vera_data0 = source[i]
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}
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}
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inline void vera_upload(int24 address, pointer source, byte size) {
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vera_ctrl = 0
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vera_addr_lo = address.b0
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vera_addr_mi = address.b1
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vera_addr_hi = address.b2 | $10
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asm {
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? ldy #0
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__vera_upload_loop:
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? lda (source),y
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! sta vera_data0
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? iny
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? cpy size
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? bne __vera_upload_loop
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}
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}
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inline void vera_reset() {
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vera_ctrl = $80
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vera_ctrl = 0
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}
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struct vera_sprite_data {
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word address
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word x
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word y
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byte ctrl0
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byte ctrl1
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}
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void vera_upload_sprite(byte sprite_id, pointer.vera_sprite_data source) {
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vera_ctrl = 0
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vera_addr_lo = sprite_id << 3
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vera_addr_mi = (sprite_id >> 5) | VERA_SPRITES.b1
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vera_addr_hi = VERA_SPRITES.b2 | $10
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asm {
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? ldy #0
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__vera_upload_sprite_loop:
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? lda (source),y
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! sta vera_data0
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? iny
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? cpy #sizeof(vera_sprite_data)
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? bne __vera_upload_sprite_loop
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}
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}
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inline void vera_set_sprites_enable(bool enabled) {
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vera_ctrl = 0
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if enabled {
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vera_dc_video_hstart |= $40
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} else {
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vera_dc_video_hstart &= $ff ^ $40
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}
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}
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inline void vera_set_border(byte color) {
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vera_ctrl = 0
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vera_dc_border_vstop = color
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}
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alias set_border = vera_set_border
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