batching example

#include <Arduino.h>
#include <tft_io.hpp>
#include <ili9341.hpp>
#include <gfx_cpp14.hpp>
using namespace arduino;
using namespace gfx;

#define LCD_HOST    VSPI
#define PIN_NUM_MISO 25
#define PIN_NUM_MOSI 23
#define PIN_NUM_CLK  19
#define PIN_NUM_CS   22

#define PIN_NUM_DC   21
#define PIN_NUM_RST  18
#define PIN_NUM_BCKL 5

using bus_t = tft_spi_ex<VSPI,PIN_NUM_CS,PIN_NUM_MOSI,PIN_NUM_MISO,PIN_NUM_CLK,SPI_MODE0,false,320*240*2+8,2>;
using lcd_t = ili9341<PIN_NUM_DC,PIN_NUM_RST,PIN_NUM_BCKL,bus_t,1,false,400,200>;

lcd_t lcd;

void setup() {
  Serial.begin(115200);
  hsv_pixel<24> px(true,0,1,1);
  auto px2 = px;
  // batching is the fastest way
  auto b = draw::batch(lcd,lcd.bounds());
  for(int y = 0;y<lcd.dimensions().height;++y) {
    px2.template channelr<channel_name::S>(((double)y)/lcd.bounds().y2);
    for(int x = 0;x<320;++x) {
      px2.template channelr<channel_name::V>(((double)x)/lcd.bounds().x2);
      b.write(px2);
    }
  }
  // commit what we wrote
  b.commit();
  px2.template channelr<channel_name::H>(.5);
  // batching is the fastest way
  auto ba = draw::batch_async(lcd,lcd.bounds());
  for(int y = 0;y<lcd.dimensions().height;++y) {
    px2.template channelr<channel_name::S>(((double)y)/lcd.bounds().y2);
    for(int x = 0;x<320;++x) {
      px2.template channelr<channel_name::V>(((double)x)/lcd.bounds().x2);
      ba.write(px2);
    }
  }
  // commit what we wrote
  ba.commit();
}

void loop() {
  // put your main code here, to run repeatedly:
}