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