raytracing/util.cpp

#include "util.h"
static RenderableBuffer* sRenderableBuffer = nullptr;
void InitRenderableBuffer(HDC dc, int width, int height)
{
	sRenderableBuffer = new RenderableBuffer();
	sRenderableBuffer->mDC = CreateCompatibleDC(dc);
	BITMAPINFO bitmapinfo = {};
	bitmapinfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
	bitmapinfo.bmiHeader.biPlanes = 1;
	bitmapinfo.bmiHeader.biBitCount = 32;
	bitmapinfo.bmiHeader.biCompression = BI_RGB;
	bitmapinfo.bmiHeader.biWidth = width;
	bitmapinfo.bmiHeader.biHeight = height;
	sRenderableBuffer->mBitmap = CreateDIBSection(sRenderableBuffer->mDC, &bitmapinfo, DIB_RGB_COLORS, (void**)&sRenderableBuffer->mColorBuffer, 0, 0);
	SelectObject(sRenderableBuffer->mDC, sRenderableBuffer->mBitmap);
	sRenderableBuffer->mHeight = height;
	sRenderableBuffer->mWidth = width;
	sRenderableBuffer->mPixelCount = height * width;
}

void SetColor(int x, int y, AByte r, AByte g, AByte b, AByte a)
{
	AUint color = (a << 24) + (r << 16) + (g << 8) + b;
	int pixel_index = y * sRenderableBuffer->mWidth + x;
	if (pixel_index < sRenderableBuffer->mPixelCount) {
		sRenderableBuffer->mColorBuffer[pixel_index] = color;
	}
}

void ASwapBuffers(HDC dc)
{
	BitBlt(dc, 0, 0, sRenderableBuffer->mWidth, sRenderableBuffer->mHeight, sRenderableBuffer->mDC, 0,0, SRCCOPY);
}