SplenkOS/kernel/src/BasicRenderer.cpp

#include "BasicRenderer.h"

BasicRenderer* GlobalRenderer;

BasicRenderer::BasicRenderer(Framebuffer* framebuffer, PSF1_FONT* psf1_Font) {
	targetFramebuffer = framebuffer;
	PSF1_Font = psf1_Font;
	Colour = 0xFFFFFFFF;
	cursorPosition = {0,0};
}

void BasicRenderer::PutChar(char chr, unsigned int xOff, unsigned int yOff) {
	unsigned int* pixPtr = (unsigned int*)targetFramebuffer->BaseAddress;
	char* fontPtr = (char*)PSF1_Font->glyphBuffer + (chr * PSF1_Font->psf1_Header->charsize);
	for (unsigned long y = yOff; y < yOff + 18; y++) {
		for (unsigned long x = xOff; x < xOff+8; x++) {
			
			if ((*fontPtr & (0b10000000 >> (x - xOff))) > 0) {
				*(unsigned int*)(pixPtr + x + (y * targetFramebuffer->PixelsPerScanline)) = Colour;
			}

		}

		fontPtr++;
	}
}

void BasicRenderer::PutChar(char chr) {
	PutChar(chr, cursorPosition.x, cursorPosition.y);
	cursorPosition.x += 8;
	if (cursorPosition.x + 8 > targetFramebuffer->Width) {
		cursorPosition.x = 0;
		cursorPosition.y += 16;
	}
}

void BasicRenderer::Print(const char* str) {
	unsigned int x = 0;
	char* chr = (char*)str;

	while (*chr != 0) {
		PutChar(*chr, cursorPosition.x, cursorPosition.y);
		cursorPosition.x+=8;

		if (cursorPosition.x + 8 > targetFramebuffer->Width) {
			cursorPosition.x = 0;
			cursorPosition.y += 18;
		}

		chr++;
	}
}

void BasicRenderer::PutPixel(uint32_t x, uint32_t y, uint32_t colour) {

	*(uint32_t*)((uint64_t)targetFramebuffer->BaseAddress + (x*4) + (y * targetFramebuffer->PixelsPerScanline * 4)) = colour;

}

uint32_t BasicRenderer::GetPixel(uint32_t x, uint32_t y){
    return *(uint32_t*)((uint64_t)targetFramebuffer->BaseAddress + (x*4) + (y * targetFramebuffer->PixelsPerScanline * 4));
}

void BasicRenderer::ClearMouseCursor(uint8_t* mouseCursor, Point position) {
	int xMax = 16;
	int yMax = 19;
	int diffX = targetFramebuffer->Width - position.x;
	int diffY = targetFramebuffer->Height - position.y;

	if (diffX < 16) xMax = diffX;
	if (diffY < 19) yMax = diffY;

	for (int y = 0; y < yMax; y++) {
		for (int x = 0; x < xMax; x++) {
			int bit = y * 16 + x;
			int byte = bit / 8;

			if (mouseCursor[byte] & (0b10000000 >> (x % 8))) {
				PutPixel(position.x + x, position.y + y, mouseCursorBuffer[x + y*16]);
			}
		}
	}
}

void BasicRenderer::DrawOverlayMouseCursor(uint8_t* mouseCursor, Point position, uint32_t colour) {
	int xMax = 16;
	int yMax = 19;
	int diffX = targetFramebuffer->Width - position.x;
	int diffY = targetFramebuffer->Height - position.y;

	if (diffX < 16) xMax = diffX;
	if (diffY < 19) yMax = diffY;

	for (int y = 0; y < yMax; y++) {
		for (int x = 0; x < xMax; x++) {
			int bit = y * 16 + x;
			int byte = bit / 8;

			if (mouseCursor[byte] & (0b10000000 >> (x % 8))) {
				mouseCursorBuffer[x + y*16] = GetPixel(position.x + x, position.y + y);
				PutPixel(position.x + x, position.y + y, colour);
			}
		}
	}
}

void BasicRenderer::Clear() {
	uint64_t fbBase = (uint64_t)targetFramebuffer->BaseAddress;
    uint64_t bytesPerScanline = targetFramebuffer->PixelsPerScanline * 4;
    uint64_t fbHeight = targetFramebuffer->Height;
    uint64_t fbSize = targetFramebuffer->BufferSize;

    for (int verticalScanline = 0; verticalScanline < fbHeight; verticalScanline ++){
        uint64_t pixPtrBase = fbBase + (bytesPerScanline * verticalScanline);
        for (uint32_t* pixPtr = (uint32_t*)pixPtrBase; pixPtr < (uint32_t*)(pixPtrBase + bytesPerScanline); pixPtr ++){
            *pixPtr = ClearColour;
        }
    }
}

void BasicRenderer::ClearChar(){

    if (cursorPosition.x == 0){
        cursorPosition.x = targetFramebuffer->Width;
        cursorPosition.y -= 16;
        if (cursorPosition.y < 0) cursorPosition.y = 0;
    }

    unsigned int xOff = cursorPosition.x;
    unsigned int yOff = cursorPosition.y;

    unsigned int* pixPtr = (unsigned int*)targetFramebuffer->BaseAddress;
    for (unsigned long y = yOff; y < yOff + 16; y++){
        for (unsigned long x = xOff - 8; x < xOff; x++){
                    *(unsigned int*)(pixPtr + x + (y * targetFramebuffer->PixelsPerScanline)) = ClearColour;
        }
    }

    cursorPosition.x -= 8;

    if (cursorPosition.x < 0){
        cursorPosition.x = targetFramebuffer->Width;
        cursorPosition.y -= 16;
        if (cursorPosition.y < 0) cursorPosition.y = 0;
    }

}

void BasicRenderer::Next() {
	cursorPosition.x = 0;
	cursorPosition.y += 16;
}