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gba.c
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gba.c
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#include "gba.h"
volatile unsigned short *videoBuffer = (volatile unsigned short *) 0x6000000;
u32 vBlankCounter = 0;
void waitForVBlank(void) {
// TODO: IMPLEMENT
while(SCANLINECOUNTER > 160);
while(SCANLINECOUNTER < 160);
vBlankCounter++;
// (1)
// Write a while loop that loops until we're NOT in vBlank anymore:
// (This prevents counting one VBlank more than once if your app is too fast)
// (2)
// Write a while loop that keeps going until we're in vBlank:
// (3)
// Finally, increment the vBlank counter:
}
static int __qran_seed = 42;
static int qran(void) {
__qran_seed = 1664525 * __qran_seed + 1013904223;
return (__qran_seed >> 16) & 0x7FFF;
}
int randint(int min, int max) { return (qran() * (max - min) >> 15) + min; }
void setPixel(int row, int col, u16 color) {
*(videoBuffer + OFFSET(row, col, WIDTH)) = color;
}
void drawRectDMA(int row, int col, int width, int height, volatile u16 color) {
// TODO: IMPLEMENT
volatile unsigned short lcolor;
lcolor = color;
for(int r=0; r<height; r++) {
DMA[3].src = &lcolor;
DMA[3].dst = &videoBuffer[OFFSET(row+r,col,WIDTH)];
DMA[3].cnt = width | DMA_ON | DMA_SOURCE_FIXED | DMA_DESTINATION_INCREMENT;
}
}
void drawFullScreenImageDMA(const u16 *image) {
// TODO: IMPLEMENT
for (int r = 0; r < HEIGHT; r++) {
DMA[3].src = &image[OFFSET(r, 0, WIDTH)];
DMA[3].dst = &videoBuffer[OFFSET(r, 0, WIDTH)];
DMA[3].cnt = WIDTH | DMA_ON | DMA_SOURCE_INCREMENT | DMA_DESTINATION_INCREMENT;
}
}
void drawImageDMA(int row, int col, int width, int height, const u16 *image) {
// TODO: IMPLEMENT
for (int r = 0; r < height; r++) {
DMA[3].src = &image[OFFSET(r, 0, width)];
DMA[3].dst = &videoBuffer[OFFSET(row + r, col, 240)];
DMA[3].cnt = width | DMA_ON | DMA_SOURCE_INCREMENT | DMA_DESTINATION_INCREMENT;
}
}
void fillScreenDMA(volatile u16 color) {
// TODO: IMPLEMENT
for (int r = 0; r < HEIGHT; r++) {
DMA[3].src = &color;
DMA[3].dst = &videoBuffer[OFFSET(r, 0, WIDTH)];
DMA[3].cnt = WIDTH | DMA_ON | DMA_SOURCE_FIXED;
}
}
void drawChar(int row, int col, char ch, u16 color) {
for (int i = 0; i < 6; i++) {
for (int j = 0; j < 8; j++) {
if (fontdata_6x8[OFFSET(j, i, 6) + ch * 48]) {
setPixel(row + j, col + i, color);
}
}
}
}
void drawString(int row, int col, char *str, u16 color) {
while (*str) {
drawChar(row, col, *str++, color);
col += 6;
}
}
void drawCenteredString(int row, int col, int width, int height, char *str, u16 color) {
u32 len = 0;
char *strCpy = str;
while (*strCpy) {
len++;
strCpy++;
}
u32 strWidth = 6 * len;
u32 strHeight = 8;
int new_row = row + ((height - strHeight) >> 1);
int new_col = col + ((width - strWidth) >> 1);
drawString(new_row, new_col, str, color);
}