grafikaKBT/Utils.cpp

#include "Utils.h"
#include <chrono>
#include <thread>

BITMAPINFOHEADER bitmapInfoHeader;
unsigned char* bitmapData;

void DisableQuickEdit() {
    HANDLE hInput = GetStdHandle(STD_INPUT_HANDLE);
    DWORD prev_mode;
    GetConsoleMode(hInput, &prev_mode);
    SetConsoleMode(hInput, prev_mode & ~ENABLE_QUICK_EDIT_MODE & ~ENABLE_INSERT_MODE);
}

void CreateConsole() {
    if (AllocConsole()) {
        FILE* conin; FILE* conout; FILE* conerr;
        freopen_s(&conin, "conin$", "r", stdin);
        freopen_s(&conout, "conout$", "w", stdout);
        freopen_s(&conerr, "conout$", "w", stderr);
    }
}

unsigned char* LoadBitmapFile(char* filename, BITMAPINFOHEADER* bitmapInfoHeader) {
    FILE* filePtr;
    BITMAPFILEHEADER bitmapFileHeader;
    unsigned char* bitmapImage;
    int imageIdx = 0;
    unsigned char tempRGB;

    filePtr = fopen(filename, "rb");
    if (filePtr == NULL) return NULL;

    fread(&bitmapFileHeader, sizeof(BITMAPFILEHEADER), 1, filePtr);
    if (bitmapFileHeader.bfType != BITMAP_ID) {
        fclose(filePtr);
        return NULL;
    }

    fread(bitmapInfoHeader, sizeof(BITMAPINFOHEADER), 1, filePtr);
    fseek(filePtr, bitmapFileHeader.bfOffBits, SEEK_SET);
    bitmapImage = (unsigned char*)malloc(bitmapInfoHeader->biSizeImage);

    if (!bitmapImage) {
        free(bitmapImage);
        fclose(filePtr);
        return NULL;
    }

    fread(bitmapImage, 1, bitmapInfoHeader->biSizeImage, filePtr);
    if (bitmapImage == NULL) {
        fclose(filePtr);
        return NULL;
    }

    for (imageIdx = 0; imageIdx < bitmapInfoHeader->biSizeImage; imageIdx += 3) {
        tempRGB = bitmapImage[imageIdx];
        bitmapImage[imageIdx] = bitmapImage[imageIdx + 2];
        bitmapImage[imageIdx + 2] = tempRGB;
    }

    fclose(filePtr);
    return bitmapImage;
}

void MakeShadowMatrix(GLfloat shadowMat[16], GLfloat groundplane[4], GLfloat lightpos[4]) {
    GLfloat dot = groundplane[0] * lightpos[0] + groundplane[1] * lightpos[1] +
        groundplane[2] * lightpos[2] + groundplane[3] * lightpos[3];

    shadowMat[0] = dot - lightpos[0] * groundplane[0];
    shadowMat[4] = 0.f - lightpos[0] * groundplane[1];
    shadowMat[8] = 0.f - lightpos[0] * groundplane[2];
    shadowMat[12] = 0.f - lightpos[0] * groundplane[3];

    shadowMat[1] = 0.f - lightpos[1] * groundplane[0];
    shadowMat[5] = dot - lightpos[1] * groundplane[1];
    shadowMat[9] = 0.f - lightpos[1] * groundplane[2];
    shadowMat[13] = 0.f - lightpos[1] * groundplane[3];

    shadowMat[2] = 0.f - lightpos[2] * groundplane[0];
    shadowMat[6] = 0.f - lightpos[2] * groundplane[1];
    shadowMat[10] = dot - lightpos[2] * groundplane[2];
    shadowMat[14] = 0.f - lightpos[2] * groundplane[3];

    shadowMat[3] = 0.f - lightpos[3] * groundplane[0];
    shadowMat[7] = 0.f - lightpos[3] * groundplane[1];
    shadowMat[11] = 0.f - lightpos[3] * groundplane[2];
    shadowMat[15] = dot - lightpos[3] * groundplane[3];
}

void LimitFPS(int targetFPS) {
    static auto lastTime = std::chrono::high_resolution_clock::now();
    double targetFrameDuration = 1.0 / targetFPS;
    auto currentTime = std::chrono::high_resolution_clock::now();
    std::chrono::duration<double> elapsed = currentTime - lastTime;

    while (elapsed.count() < targetFrameDuration) {
        currentTime = std::chrono::high_resolution_clock::now();
        elapsed = currentTime - lastTime;
    }
    lastTime = std::chrono::high_resolution_clock::now();
}

void SetDCPixelFormat(HDC hDC) {
    int nPixelFormat;
    static PIXELFORMATDESCRIPTOR pfd = {
        sizeof(PIXELFORMATDESCRIPTOR), 1,
        PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER,
        PFD_TYPE_RGBA, 24,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        32, 0, 0, PFD_MAIN_PLANE, 0, 0, 0, 0
    };
    nPixelFormat = ChoosePixelFormat(hDC, &pfd);
    SetPixelFormat(hDC, nPixelFormat, &pfd);
}

HPALETTE GetOpenGLPalette(HDC hDC) {
    HPALETTE hRetPal = NULL;
    PIXELFORMATDESCRIPTOR pfd;
    LOGPALETTE* pPal;
    int nPixelFormat;
    int nColors;
    int i;
    BYTE RedRange, GreenRange, BlueRange;

    nPixelFormat = GetPixelFormat(hDC);
    DescribePixelFormat(hDC, nPixelFormat, sizeof(PIXELFORMATDESCRIPTOR), &pfd);

    if (!(pfd.dwFlags & PFD_NEED_PALETTE)) return NULL;

    nColors = 1 << pfd.cColorBits;
    pPal = (LOGPALETTE*)malloc(sizeof(LOGPALETTE) + nColors * sizeof(PALETTEENTRY));

    pPal->palVersion = 0x300;
    pPal->palNumEntries = nColors;

    RedRange = (1 << pfd.cRedBits) - 1;
    GreenRange = (1 << pfd.cGreenBits) - 1;
    BlueRange = (1 << pfd.cBlueBits) - 1;

    for (i = 0; i < nColors; i++) {
        pPal->palPalEntry[i].peRed = (i >> pfd.cRedShift) & RedRange;
        pPal->palPalEntry[i].peRed = (unsigned char)((double)pPal->palPalEntry[i].peRed * 255.0 / RedRange);
        pPal->palPalEntry[i].peGreen = (i >> pfd.cGreenShift) & GreenRange;
        pPal->palPalEntry[i].peGreen = (unsigned char)((double)pPal->palPalEntry[i].peGreen * 255.0 / GreenRange);
        pPal->palPalEntry[i].peBlue = (i >> pfd.cBlueShift) & BlueRange;
        pPal->palPalEntry[i].peBlue = (unsigned char)((double)pPal->palPalEntry[i].peBlue * 255.0 / BlueRange);
        pPal->palPalEntry[i].peFlags = 0;
    }

    hRetPal = CreatePalette(pPal);
    SelectPalette(hDC, hRetPal, FALSE);
    RealizePalette(hDC);
    free(pPal);
    return hRetPal;
}