#include "SwapChain.h"
#include "stm32h7xx_hal.h"

extern DMA_HandleTypeDef hdma_memtomem_dma1_stream0;
extern SRAM_HandleTypeDef hsram1;

volatile bool xferComplete = false;
extern "C" void frameXferCpltCallback(DMA_HandleTypeDef* hdma){
	xferComplete = true;
}


SwapChain::SwapChain() : _backBufferTexture(&_backBuffer, getBackBufferDescription()){

}

void SwapChain::present(){

    beginLcdUpload();
    waitLcdUpload();
}


uint32_t frameStartTime = 0;
void SwapChain::beginLcdUpload(){
	uint32_t frameMaxTime = 1000/112;
	auto frameTime = HAL_GetTick() - frameStartTime;
	if(frameTime < frameMaxTime){
		HAL_Delay(frameMaxTime - frameTime);
	}

	Lcd::setCursor(0,0);
	Lcd::beginWriteGram();
	frameStartTime = HAL_GetTick();
	//SCB_CleanInvalidateDCache_by_Addr((uint32_t*)DisplayFsmcInterface::dataLocation, sizeof(frameBuffer));
	//SCB_CleanDCache_by_Addr((uint32_t*)&frameBuffer[0], sizeof(frameBuffer));
    //HAL_SRAM_Write_DMA(&hsram1, (uint32_t*)DisplayFsmcInterface::dataLocation, (uint32_t*)&frameBuffer[0], sizeof(frameBuffer) / 4);
	HAL_DMA_Start_IT(&hdma_memtomem_dma1_stream0, (uint32_t)_backBuffer.GetPointer(), (uint32_t)Stm32PlusPlus::Display::DisplayFsmcInterface::addressMap.dataLocation(), 320*240 / 2);
}

void SwapChain::waitLcdUpload(){
	while(!xferComplete){}

	xferComplete = false;
}

void SwapChain::init() {
    hdma_memtomem_dma1_stream0.XferCpltCallback = frameXferCpltCallback;
    Lcd::init();

	Lcd::setOrientation(90);
}

TextureDescription SwapChain::getBackBufferDescription(){
	TextureDescription desc;
	desc.Width = BackBufferMipChain::Width;
	desc.Height = BackBufferMipChain::Height;
	desc.BytesPerPixel = BackBufferMipChain::BytesPerPixel;
	desc.MipCount = BackBufferMipChain::MipsCount;
	return desc;
}