aiie/teensy/teensy-display.cpp

353 lines
10 KiB
C++

#include <ctype.h> // isgraph
#include <DMAChannel.h>
#include "teensy-display.h"
#include "iocompat.h"
#include "appleui.h"
// FIXME should be able to omit this include and rely on the xterns, which
// would prove it's linking properly
#include "font.h"
extern const unsigned char ucase_glyphs[512];
extern const unsigned char lcase_glyphs[256];
extern const unsigned char mousetext_glyphs[256];
extern const unsigned char interface_glyphs[256];
#include "globals.h"
#include "applevm.h"
#include <SPI.h>
#define _clock 50000000
#define PIN_RST 8
#define PIN_DC 9
#define PIN_CS 0
#define PIN_MOSI 26
#define PIN_MISO 1
#define PIN_SCK 27
#define SCREENINSET_X (18*TEENSYDISPLAY_SCALE)
#define SCREENINSET_Y (13*TEENSYDISPLAY_SCALE)
// RGB map of each of the lowres colors
const uint16_t loresPixelColors[16] = { 0x0000, // 0 black
0xC006, // 1 magenta
0x0010, // 2 dark blue
0xA1B5, // 3 purple
0x0480, // 4 dark green
0x6B4D, // 5 dark grey
0x1B9F, // 6 med blue
0x0DFD, // 7 light blue
0x92A5, // 8 brown
0xF8C5, // 9 orange
0x9555, // 10 light gray
0xFCF2, // 11 pink
0x07E0, // 12 green
0xFFE0, // 13 yellow
0x87F0, // 14 aqua
0xFFFF // 15 white
};
// This definition can't live in the class header because of the
// DMAMEM adornment
DMAMEM uint16_t dmaBuffer[TEENSYDISPLAY_HEIGHT][TEENSYDISPLAY_WIDTH];
#define RGBto565(r,g,b) ((((r) & 0xF8) << 8) | (((g) & 0xFC) << 3) | ((b) >> 3))
#define _565toR(c) ( ((c) & 0xF800) >> 8 )
#define _565toG(c) ( ((c) & 0x07E0) >> 3 )
#define _565toB(c) ( ((c) & 0x001F) << 3 )
#define luminanceFromRGB(r,g,b) ( ((r)*0.2126) + ((g)*0.7152) + ((b)*0.0722) )
ILI9341_t3n tft = ILI9341_t3n(PIN_CS, PIN_DC, PIN_RST, PIN_MOSI, PIN_SCK, PIN_MISO);
DMAChannel dmatx;
DMASetting dmaSetting;
TeensyDisplay::TeensyDisplay()
{
memset(dmaBuffer, 0x80, sizeof(dmaBuffer));
tft.begin(_clock);
tft.setRotation(3);
tft.setFrameBuffer((uint16_t *)dmaBuffer);
tft.useFrameBuffer(true);
tft.fillScreen(ILI9341_BLACK);
driveIndicator[0] = driveIndicator[1] = false;
driveIndicatorDirty = true;
}
TeensyDisplay::~TeensyDisplay()
{
}
void TeensyDisplay::flush()
{
// Nothing to flush, b/c the DMA driver is regularly flushing everything
}
void TeensyDisplay::redraw()
{
g_ui->drawStaticUIElement(UIeOverlay);
if (g_vm && g_ui) {
g_ui->drawOnOffUIElement(UIeDisk1_state, ((AppleVM *)g_vm)->DiskName(0)[0] == '\0');
g_ui->drawOnOffUIElement(UIeDisk2_state, ((AppleVM *)g_vm)->DiskName(1)[0] == '\0');
}
}
void TeensyDisplay::drawImageOfSizeAt(const uint8_t *img,
uint16_t sizex, uint16_t sizey,
uint16_t wherex, uint16_t wherey)
{
uint8_t r, g, b;
// FIXME this needs to scale with TEENSYDISPLAY_SCALE
for (uint16_t y=0; y<sizey; y++) {
for (uint16_t x=0; x<sizex; x++) {
r = pgm_read_byte(&img[(y*sizex + x)*3 + 0]);
g = pgm_read_byte(&img[(y*sizex + x)*3 + 1]);
b = pgm_read_byte(&img[(y*sizex + x)*3 + 2]);
dmaBuffer[y+wherey][x+wherex] = RGBto565(r,g,b);
}
}
}
void TeensyDisplay::blit()
{
// Start DMA transfers if they aren't running
if (!tft.asyncUpdateActive())
tft.updateScreenAsync(true);
// draw overlay, if any, occasionally
{
static uint32_t nextMessageTime = 0;
if (millis() >= nextMessageTime) {
if (overlayMessage[0]) {
drawString(M_SELECTDISABLED, 1, TEENSYDISPLAY_HEIGHT - (16 + 12)*TEENSYDISPLAY_SCALE, overlayMessage);
}
nextMessageTime = millis() + 10; // DEBUGGING FIXME make 1000 again
}
}
}
void TeensyDisplay::blit(AiieRect r)
{
// Nothing to do here, since we're regularly blitting the whole screen via DMA
}
void TeensyDisplay::drawUIPixel(uint16_t x, uint16_t y, uint16_t color)
{
// These pixels are just cached in the buffer; they're not drawn directly.
dmaBuffer[y][x] = color;
}
void TeensyDisplay::drawPixel(uint16_t x, uint16_t y, uint16_t color)
{
tft.drawPixel(x,y,color);
}
void TeensyDisplay::drawPixel(uint16_t x, uint16_t y, uint8_t r, uint8_t g, uint8_t b)
{
uint16_t color16 = ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | ((b & 0xF8) >> 3);
drawPixel(x,y,color16);
}
void TeensyDisplay::drawCharacter(uint8_t mode, uint16_t x, uint16_t y, char c)
{
int8_t xsize = 8,
ysize = 0x07;
uint16_t offPixel, onPixel;
switch (mode) {
case M_NORMAL:
onPixel = 0xFFFF;
offPixel = 0x0010;
break;
case M_SELECTED:
onPixel = 0x0000;
offPixel = 0xFFFF;
break;
case M_DISABLED:
default:
onPixel = 0x7BEF;
offPixel = 0x0000;
break;
case M_SELECTDISABLED:
onPixel = 0x7BEF;
offPixel = 0xFFE0;
break;
case M_PLAIN:
onPixel = 0xFFFF;
offPixel = 0x0000;
break;
}
// This does not scale when drawing, because drawPixel scales.
const unsigned char *ch = asciiToAppleGlyph(c);
for (int8_t y_off = 0; y_off <= ysize; y_off++) {
for (int8_t x_off = 0; x_off <= xsize; x_off++) {
if (*ch & (1 << (x_off))) {
drawUIPixel(x + x_off, y + y_off, onPixel);
} else {
drawUIPixel(x + x_off, y + y_off, offPixel);
}
}
ch++;
}
}
void TeensyDisplay::drawString(uint8_t mode, uint16_t x, uint16_t y, const char *str)
{
int8_t xsize = 8; // width of a char in this font
for (int8_t i=0; i<strlen(str); i++) {
drawCharacter(mode, x, y, str[i]);
x += xsize; // fixme: any inter-char spacing?
if (x >= 320) break; // FIXME constant - and pre-scaling, b/c that's in drawCharacter
}
}
void TeensyDisplay::clrScr(uint8_t coloridx)
{
if (coloridx == c_black) {
memset(dmaBuffer, 0x00, sizeof(dmaBuffer));
} else if (coloridx == c_white) {
memset(dmaBuffer, 0xFF, sizeof(dmaBuffer));
} else {
uint16_t color16 = loresPixelColors[c_black];
if (coloridx < 16)
color16 = loresPixelColors[coloridx];
// This could be faster - make one line, then memcpy the line to the other
// lines?
for (uint16_t y=0; y<TEENSYDISPLAY_HEIGHT; y++) {
for (uint16_t x=0; x<TEENSYDISPLAY_WIDTH; x++) {
dmaBuffer[y][x] = color16;
}
}
}
}
inline uint16_t blendColors(uint16_t a, uint16_t b)
{
// Straight linear average doesn't work well for inverted text, because the
// whites overwhelm the blacks.
//return ((uint32_t)a + (uint32_t)b)/2;
#if 0
// Testing a logarithmic color scale. My theory was that, since our
// colors here are mostly black or white, it would be reasonable to
// use a log scale of the average to bump up the brightness a
// little. In practice, it's not really legible.
return RGBto565( (uint8_t)(logfn((_565toR(a) + _565toR(b))/2)),
(uint8_t)(logfn((_565toG(a) + _565toG(b))/2)),
(uint8_t)(logfn((_565toB(a) + _565toB(b))/2)) );
#endif
// Doing an R/G/B average works okay for legibility. It's not great for
// inverted text.
return RGBto565( (_565toR(a) + _565toR(b))/2,
(_565toG(a) + _565toG(b))/2,
(_565toB(a) + _565toB(b))/2 );
}
// This was called with the expectation that it can draw every one of
// the 560x192 pixels that could be addressed. If TEENSYDISPLAY_SCALE
// is 1, then we have half of that horizontal resolution - so we need
// to be creative and blend neighboring pixels together.
void TeensyDisplay::cachePixel(uint16_t x, uint16_t y, uint8_t color)
{
#if TEENSYDISPLAY_SCALE == 1
// This is the case where we need to blend together neighboring
// pixels, because we don't have enough physical screen resoultion.
if (x&1) {
uint16_t origColor = dmaBuffer[y+SCREENINSET_Y][(x>>1)*TEENSYDISPLAY_SCALE+SCREENINSET_X];
uint16_t newColor = (uint16_t) loresPixelColors[color];
if (g_displayType == m_blackAndWhite) {
// There are four reasonable decisions here: if either pixel
// *was* on, then it's on; if both pixels *were* on, then it's
// on; and if the blended value of the two pixels were on, then
// it's on; or if the blended value of the two is above some
// certain overall brightness, then it's on. This is the last of
// those - where the brightness cutoff is defined in the bios as
// g_luminanceCutoff.
uint16_t blendedColor = blendColors(origColor, newColor);
uint16_t luminance = luminanceFromRGB(_565toR(blendedColor),
_565toG(blendedColor),
_565toB(blendedColor));
cacheDoubleWidePixel(x>>1,y,(uint16_t)((luminance >= g_luminanceCutoff) ? 0xFFFF : 0x0000));
} else {
cacheDoubleWidePixel(x>>1,y,color);
// Else if it's black, we leave whatever was in the other pixel.
}
} else {
// The even pixels always draw.
cacheDoubleWidePixel(x>>1,y,color);
}
#else
// we have enough resolution to show all the pixels, so just do it
x = (x * TEENSYDISPLAY_SCALE)/2;
for (int yoff=0; yoff<TEENSYDISPLAY_SCALE; yoff++) {
for (int xoff=0; xoff<TEENSYDISPLAY_SCALE; xoff++) {
dmaBuffer[y*TEENSYDISPLAY_SCALE+yoff+SCREENINSET_Y][x+xoff+SCREENINSET_X] = color;
}
}
#endif
}
void TeensyDisplay::cacheDoubleWidePixel(uint16_t x, uint16_t y, uint16_t color16)
{
for (int yoff=0; yoff<TEENSYDISPLAY_SCALE; yoff++) {
for (int xoff=0; xoff<TEENSYDISPLAY_SCALE; xoff++) {
dmaBuffer[(y*TEENSYDISPLAY_SCALE+yoff+SCREENINSET_Y)][x*TEENSYDISPLAY_SCALE+xoff+SCREENINSET_X] = color16;
}
}
}
// "DoubleWide" means "please double the X because I'm in low-res
// width mode".
void TeensyDisplay::cacheDoubleWidePixel(uint16_t x, uint16_t y, uint8_t color)
{
uint16_t color16;
color16 = loresPixelColors[(( color & 0x0F ) )];
for (int yoff=0; yoff<TEENSYDISPLAY_SCALE; yoff++) {
for (int xoff=0; xoff<TEENSYDISPLAY_SCALE; xoff++) {
dmaBuffer[(y*TEENSYDISPLAY_SCALE+yoff+SCREENINSET_Y)][x*TEENSYDISPLAY_SCALE+xoff+SCREENINSET_X] = color16;
}
}
}
// This exists for 4bpp optimization. We could totally call
// cacheDoubleWidePixel twice, but the (x&1) pfutzing is messy if
// we're just storing both halves anyway...
void TeensyDisplay::cache2DoubleWidePixels(uint16_t x, uint16_t y,
uint8_t colorA, uint8_t colorB)
{
for (int yoff=0; yoff<TEENSYDISPLAY_SCALE; yoff++) {
for (int xoff=0; xoff<TEENSYDISPLAY_SCALE; xoff++) {
dmaBuffer[(y*TEENSYDISPLAY_SCALE+yoff+SCREENINSET_Y)][x*TEENSYDISPLAY_SCALE+2*xoff+SCREENINSET_X] = loresPixelColors[colorA];
dmaBuffer[(y*TEENSYDISPLAY_SCALE+yoff+SCREENINSET_Y)][x*TEENSYDISPLAY_SCALE+1+2*xoff+SCREENINSET_X] = loresPixelColors[colorB];
}
}
}
inline double logfn(double x)
{
// At a value of x=255, log(base 1.022)(x) is 254.636.
return log(x)/log(1.022);
}
uint32_t TeensyDisplay::frameCount()
{
return tft.frameCount();
}