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mylib.c
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mylib.c
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// Hexiang Li
#include "mylib.h"
#include "font.c"
u16 *videoBuffer = (u16 *)0x6000000;
void setPixel(int row, int col, u16 color)
{
videoBuffer[OFFSET(row, col, 240)] = color;
}
void waitForVblank()
{
while(SCANLINECOUNTER > 160);
while(SCANLINECOUNTER < 160);
}
// void fillScreen4(char index)
// {
// volatile u16 color = (index<<8) | index;
// DMA[3].src = &color;
// DMA[3].dst = videoBuffer;
// DMA[3].cnt = 19200 | DMA_ON | DMA_SOURCE_FIXED;
// }
void setPixel4(int row, int col, char index)
{
int whichPixel = OFFSET(row, col, 240);
int whichShort = whichPixel/2;
unsigned short theShort = videoBuffer[whichShort];
if(col&1)
{
// Col is odd, we insert index to the left byte
theShort = (theShort & 0x00FF) | (index << 8);
}
else
{
theShort = (theShort & 0xFF00) | index;
}
videoBuffer[whichShort] = theShort;
}
void drawImage4(int r, int c, int width, int height, const u16* image)
{
for (int y = 0; y < height; y++) {
DMA[3].src = &image[OFFSET(y, 0, width / 2)];
DMA[3].dst = videoBuffer + OFFSET(r + y, c, 240)/2;
DMA[3].cnt = (width/2) | DMA_ON;
}
}
void FlipPage()
{
if(REG_DISPCTL & BUFFER1FLAG)
{
// We were displaying buffer1 and videobuffer was buffer 0
REG_DISPCTL = REG_DISPCTL & ~BUFFER1FLAG;
videoBuffer = BUFFER1;
}
else
{
REG_DISPCTL = REG_DISPCTL | BUFFER1FLAG;
videoBuffer = BUFFER0;
}
}
void drawChar(int row, int col, char ch, u16 color)
{
int r,c;
for(r=0; r<8; r++)
{
for(c=0; c<6; c++)
{
if(fontdata_6x8[(r*6+c)+(48*ch)] == 1)
{
setPixel(row+r, col+c, color);
}
}
}
}
void drawString(int row, int col, char *str, u16 color)
{
while(*str)
{
drawChar(row, col, *str++, color);
col += 6;
}
}
void drawChar4(int row, int col, char ch, char index)
{
int r,c;
for(r=0; r<8; r++)
{
for(c=0; c<6; c++)
{
if(fontdata_6x8[(r*6+c)+(48*ch)] == 1)
{
setPixel4(row+r, col+c, index);
}
}
}
}
void drawString4(int row, int col, char *str, char index)
{
while(*str)
{
drawChar4(row, col, *str++, index);
col += 6;
}
}
void drawPipe(int r, int c, int hole, const u16* image)
{
drawImage4(r, c, PIPE_W, hole - r, (u16*)image);
drawImage4(hole + HOLE_L, c, PIPE_W, 160 - hole - HOLE_L, (u16*)image);
}
void loadPalette(const unsigned short * toLoad, int size, int offset) {
for (int i = offset; i < (size + offset); i++) {
PALETTE[i] = toLoad[i];
}
}
void delay(int i) {
volatile int n = 0;
while (n < i) {
waitForVblank();
n++;
}
}