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//go:build gameboyadvance
package machine
import (
"device/gba"
"image/color"
"runtime/volatile"
"unsafe"
)
// Not sure what name to pick here. Not using ARM7TDMI because that's the CPU
// name, not the device name.
const deviceName = "GBA"
// Interrupt numbers as used on the GameBoy Advance. Register them with
// runtime/interrupt.New.
const (
IRQ_VBLANK = gba.IRQ_VBLANK
IRQ_HBLANK = gba.IRQ_HBLANK
IRQ_VCOUNT = gba.IRQ_VCOUNT
IRQ_TIMER0 = gba.IRQ_TIMER0
IRQ_TIMER1 = gba.IRQ_TIMER1
IRQ_TIMER2 = gba.IRQ_TIMER2
IRQ_TIMER3 = gba.IRQ_TIMER3
IRQ_COM = gba.IRQ_COM
IRQ_DMA0 = gba.IRQ_DMA0
IRQ_DMA1 = gba.IRQ_DMA1
IRQ_DMA2 = gba.IRQ_DMA2
IRQ_DMA3 = gba.IRQ_DMA3
IRQ_KEYPAD = gba.IRQ_KEYPAD
IRQ_GAMEPAK = gba.IRQ_GAMEPAK
)
// Set has not been implemented.
func (p Pin) Set(value bool) {
// do nothing
}
var Display = DisplayMode3{(*[160][240]volatile.Register16)(unsafe.Pointer(uintptr(gba.MEM_VRAM)))}
type DisplayMode3 struct {
port *[160][240]volatile.Register16
}
func (d *DisplayMode3) Configure() {
// Use video mode 3 (in BG2, a 16bpp bitmap in VRAM) and Enable BG2
gba.DISP.DISPCNT.Set(gba.DISPCNT_BGMODE_3<<gba.DISPCNT_BGMODE_Pos |
gba.DISPCNT_SCREENDISPLAY_BG2_ENABLE<<gba.DISPCNT_SCREENDISPLAY_BG2_Pos)
}
func (d *DisplayMode3) Size() (x, y int16) {
return 240, 160
}
func (d *DisplayMode3) SetPixel(x, y int16, c color.RGBA) {
d.port[y][x].Set((uint16(c.R) >> 3) | ((uint16(c.G) >> 3) << 5) | ((uint16(c.B) >> 3) << 10))
}
func (d *DisplayMode3) Display() error {
// Nothing to do here.
return nil
}
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