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#include <stdlib.h>

#include <unistd.h>

#include <stdio.h>

#include <fcntl.h>

#include <linux/fb.h>

#include <linux/kd.h>

#include <sys/mman.h>

#include <sys/ioctl.h>

#include <sys/time.h>

#include <string.h>

#include <errno.h>

struct fb_var_screeninfo vinfo;

struct fb_fix_screeninfo finfo;

char *frameBuffer = 0;

int fbFd = 0;

int ttyFd = 0;

void printFixedInfo()

{

    printf("Fixed screen info:\n"

	   "\tid:          %s\n"

	   "\tsmem_start:  0x%lx\n"

	   "\tsmem_len:    %d\n"

	   "\ttype:        %d\n"

	   "\ttype_aux:    %d\n"

	   "\tvisual:      %d\n"

	   "\txpanstep:    %d\n"

	   "\typanstep:    %d\n"

	   "\tywrapstep:   %d\n"

	   "\tline_length: %d\n"

	   "\tmmio_start:  0x%lx\n"

	   "\tmmio_len:    %d\n"

	   "\taccel:       %d\n"

	   "\n",

	   finfo.id, finfo.smem_start, finfo.smem_len, finfo.type,

	   finfo.type_aux, finfo.visual, finfo.xpanstep, finfo.ypanstep,

	   finfo.ywrapstep, finfo.line_length, finfo.mmio_start,

	   finfo.mmio_len, finfo.accel);

}

void printVariableInfo()

{

    printf("Variable screen info:\n"

	   "\txres:           %d\n"

	   "\tyres:           %d\n"

	   "\txres_virtual:   %d\n"

	   "\tyres_virtual:   %d\n"

	   "\tyoffset:        %d\n"

	   "\txoffset:        %d\n"

	   "\tbits_per_pixel: %d\n"

	   "\tgrayscale: %d\n"

	   "\tred:    offset: %2d, length: %2d, msb_right: %2d\n"

	   "\tgreen:  offset: %2d, length: %2d, msb_right: %2d\n"

	   "\tblue:   offset: %2d, length: %2d, msb_right: %2d\n"

	   "\ttransp: offset: %2d, length: %2d, msb_right: %2d\n"

	   "\tnonstd:       %d\n"

	   "\tactivate:     %d\n"

	   "\theight:       %d\n"

	   "\twidth:        %d\n"

	   "\taccel_flags:  0x%x\n"

	   "\tpixclock:     %d\n"

	   "\tleft_margin:  %d\n"

	   "\tright_margin: %d\n"

	   "\tupper_margin: %d\n"

	   "\tlower_margin: %d\n"

	   "\thsync_len:    %d\n"

	   "\tvsync_len:    %d\n"

	   "\tsync:         %d\n"

	   "\tvmode:        %d\n"

	   "\n",

	   vinfo.xres, vinfo.yres, vinfo.xres_virtual, vinfo.yres_virtual,

	   vinfo.xoffset, vinfo.yoffset, vinfo.bits_per_pixel, vinfo.grayscale,

	   vinfo.red.offset, vinfo.red.length, vinfo.red.msb_right,

	   vinfo.green.offset, vinfo.green.length, vinfo.green.msb_right,

	   vinfo.blue.offset, vinfo.blue.length, vinfo.blue.msb_right,

	   vinfo.transp.offset, vinfo.transp.length, vinfo.transp.msb_right,

	   vinfo.nonstd, vinfo.activate, vinfo.height, vinfo.width,

	   vinfo.accel_flags, vinfo.pixclock, vinfo.left_margin,

	   vinfo.right_margin, vinfo.upper_margin, vinfo.lower_margin,

	   vinfo.hsync_len, vinfo.vsync_len, vinfo.sync, vinfo.vmode);

}

long switchToGraphicsMode()

{

    const char *const devs[] = {"/dev/tty0", "/dev/tty", "/dev/console", 0};

    const char * const *dev;

    long oldMode = KD_TEXT;

    for (dev = devs; *dev; ++dev) {

        ttyFd = open(*dev, O_RDWR);

        if (ttyFd != -1)

            break;

        printf("Opening tty device %s failed: %s\n", *dev, strerror(errno));

    }

    ioctl(ttyFd, KDGETMODE, &oldMode);

    if (oldMode == KD_GRAPHICS) {

        printf("Was in graphics mode already. Skipping\n");

        return oldMode;

    }

    int ret = ioctl(ttyFd, KDSETMODE, KD_GRAPHICS);

    if (ret == -1) {

        printf("Switch to graphics mode failed: %s\n", strerror(errno));

	return oldMode;

    }

    printf("Successfully switched to graphics mode.\n\n");

    return oldMode;

}

void restoreTextMode(long oldMode)

{

    if (ttyFd == -1)

        return;

    ioctl(ttyFd, KDSETMODE, oldMode);

    close(ttyFd);

}

struct fb_cmap oldPalette;

struct fb_cmap palette;

int paletteSize = 0;

void initPalette_16()

{

    if (finfo.type == FB_TYPE_PACKED_PIXELS) {

	// We'll setup a grayscale map for 4bpp linear

	int val = 0;

        int i;

	for (i = 0; i < 16; ++i) {

	    palette.red[i] = (val << 8) | val;

	    palette.green[i] = (val << 8) | val;

	    palette.blue[i] = (val << 8) | val;

            val += 17;

	}

	return;

    }

    // Default 16 colour palette

    unsigned char reds[16]   = { 0x00, 0x7F, 0xBF, 0xFF, 0xFF, 0xA2,

				 0x00, 0xFF, 0xFF, 0x00, 0x7F, 0x7F,

				 0x00, 0x00, 0x00, 0x82 };

    unsigned char greens[16] = { 0x00, 0x7F, 0xBF, 0xFF, 0x00, 0xC5,

				 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00,

				 0x00, 0x7F, 0x7F, 0x7F };

    unsigned char blues[16]  = { 0x00, 0x7F, 0xBF, 0xFF, 0x00, 0x11,

				 0xFF, 0x00, 0xFF, 0xFF, 0x00, 0x7F,

				 0x7F, 0x7F, 0x00, 0x00 };

    int i;

    for (i = 0; i < 16; ++i) {

	palette.red[i] = ((reds[i]) << 8) | reds[i];

	palette.green[i] = ((greens[i]) << 8) | greens[i];

	palette.blue[i] = ((blues[i]) << 8) | blues[i];

	palette.transp[i] = 0;

    }

}

void initPalette_256()

{

    if (vinfo.grayscale) {

        int i;

	for (i = 0; i < 256; ++i) {

	    unsigned short c = (i << 8) | i;

	    palette.red[i] = c;

	    palette.green[i] = c;

	    palette.blue[i] = c;

	    palette.transp[i] = 0;

	}

	return;

    }

    // 6x6x6 216 color cube

    int i = 0;

    int ir, ig, ib;

    for (ir = 0x0; ir <= 0xff; ir += 0x33) {

	for (ig = 0x0; ig <= 0xff; ig += 0x33) {

	    for (ib = 0x0; ib <= 0xff; ib += 0x33) {

		palette.red[i] = (ir << 8)|ir;

		palette.green[i] = (ig << 8)|ig;

		palette.blue[i] = (ib << 8)|ib;

		palette.transp[i] = 0;

		++i;

	    }

	}

    }

}

void initPalette()

{

    switch (vinfo.bits_per_pixel) {

    case 8: paletteSize = 256; break;

    case 4: paletteSize = 16; break;

    default: break;

    }

    if (!paletteSize)

	return; /* not using a palette */

    /* read old palette */

    oldPalette.start = 0;

    oldPalette.len = paletteSize;

    oldPalette.red = (unsigned short*)malloc(sizeof(unsigned short)*paletteSize);

    oldPalette.green = (unsigned short*)malloc(sizeof(unsigned short)*paletteSize);

    oldPalette.blue=(unsigned short*)malloc(sizeof(unsigned short)*paletteSize);

    oldPalette.transp=(unsigned short*)malloc(sizeof(unsigned short)*paletteSize);

    if (ioctl(ttyFd, FBIOGETCMAP, &oldPalette) == -1)

	perror("initPalette: error reading palette");

    /* create new palette */

    palette.start = 0;

    palette.len = paletteSize;

    palette.red = (unsigned short*)malloc(sizeof(unsigned short)*paletteSize);

    palette.green = (unsigned short*)malloc(sizeof(unsigned short)*paletteSize);

    palette.blue = (unsigned short*)malloc(sizeof(unsigned short)*paletteSize);

    palette.transp = (unsigned short*)malloc(sizeof(unsigned short)*paletteSize);

    switch (paletteSize) {

    case 16: initPalette_16(); break;

    case 256: initPalette_256(); break;

    default: break;

    }

    /* set new palette */

    if (ioctl(ttyFd, FBIOPUTCMAP, &palette) == -1)

	perror("initPalette: error setting palette");

}

void resetPalette()

{

    if (paletteSize == 0)

	return;

    if (ioctl(ttyFd, FBIOPUTCMAP, &oldPalette) == -1)

	perror("resetPalette");

    free(oldPalette.red);

    free(oldPalette.green);

    free(oldPalette.blue);

    free(oldPalette.transp);

    free(palette.red);

    free(palette.green);

    free(palette.blue);

    free(palette.transp);

}

void drawRect_rgb32(int x0, int y0, int width, int height, int color)

{

    const int bytesPerPixel = 4;

    const int stride = finfo.line_length / bytesPerPixel;

    int *dest = (int*)(frameBuffer)

                + (y0 + vinfo.yoffset) * stride

                + (x0 + vinfo.xoffset);

    int x, y;

    for (y = 0; y < height; ++y) {

        for (x = 0; x < width; ++x) {

            dest[x] = color;

        }

        dest += stride;

    }

}

void drawRect_rgb18(int x0, int y0, int width, int height, int color)

{

    const int bytesPerPixel = 3;

    const int stride = finfo.line_length - width * bytesPerPixel;

    const int red = (color & 0xff0000) >> 16;

    const int green = (color & 0xff00) >> 8;

    const int blue = (color & 0xff);

    const unsigned int packed = (blue >> 2) |

				((green >> 2) << 6) |

				((red >> 2) << 12);

    const char color18[3] = { packed & 0xff,

			      (packed & 0xff00) >> 8,

			      (packed & 0xff0000) >> 16 };

    char *dest = (char*)(frameBuffer)

		 + (y0 + vinfo.yoffset) * stride

		 + (x0 + vinfo.xoffset);

    int x, y;

    for (y = 0; y < height; ++y) {

        for (x = 0; x < width; ++x) {

	    *dest++ = color18[0];

	    *dest++ = color18[1];

	    *dest++ = color18[2];

        }

        dest += stride;

    }

}

void drawRect_rgb16(int x0, int y0, int width, int height, int color)

{

    const int bytesPerPixel = 2;

    const int stride = finfo.line_length / bytesPerPixel;

    const int red = (color & 0xff0000) >> (16 + 3);

    const int green = (color & 0xff00) >> (8 + 2);

    const int blue = (color & 0xff) >> 3;

    const short color16 = blue | (green << 5) | (red << (5 + 6));

    short *dest = (short*)(frameBuffer)

		  + (y0 + vinfo.yoffset) * stride

		  + (x0 + vinfo.xoffset);

    int x, y;

    for (y = 0; y < height; ++y) {

        for (x = 0; x < width; ++x) {

            dest[x] = color16;

        }

        dest += stride;

    }

}

void drawRect_rgb15(int x0, int y0, int width, int height, int color)

{

    const int bytesPerPixel = 2;

    const int stride = finfo.line_length / bytesPerPixel;

    const int red = (color & 0xff0000) >> (16 + 3);

    const int green = (color & 0xff00) >> (8 + 3);

    const int blue = (color & 0xff) >> 3;

    const short color15 = blue | (green << 5) | (red << (5 + 5));

    short *dest = (short*)(frameBuffer)

		  + (y0 + vinfo.yoffset) * stride

		  + (x0 + vinfo.xoffset);

    int x, y;

    for (y = 0; y < height; ++y) {

        for (x = 0; x < width; ++x) {

            dest[x] = color15;

        }

        dest += stride;

    }

}

void drawRect_palette(int x0, int y0, int width, int height, int color)

{

    const int bytesPerPixel = 1;

    const int stride = finfo.line_length / bytesPerPixel;

    const unsigned char color8 = color;

    unsigned char *dest = (unsigned char*)(frameBuffer)

                          + (y0 + vinfo.yoffset) * stride

                          + (x0 + vinfo.xoffset);

    int x, y;

    for (y = 0; y < height; ++y) {

        for (x = 0; x < width; ++x) {

            dest[x] = color8;

        }

        dest += stride;

    }

}

void drawRect(int x0, int y0, int width, int height, int color)

{

    switch (vinfo.bits_per_pixel) {

    case 32:

        drawRect_rgb32(x0, y0, width, height, color);

        break;

    case 18:

        drawRect_rgb18(x0, y0, width, height, color);

        break;

    case 16:

        drawRect_rgb16(x0, y0, width, height, color);

        break;

    case 15:

        drawRect_rgb15(x0, y0, width, height, color);

        break;

    case 8:

	drawRect_palette(x0, y0, width, height, color);

	break;

    case 4:

	drawRect_palette(x0, y0, width, height, color);

	break;

    default:

        printf("Warning: drawRect() not implemented for color depth %i\n",

               vinfo.bits_per_pixel);

        break;

    }

}

#define PERFORMANCE_RUN_COUNT 5

void performSpeedTest(void* fb, int fbSize)

{

    int i, j, run;

    struct timeval startTime, endTime;

    unsigned long long results[PERFORMANCE_RUN_COUNT];

    unsigned long long average;

    unsigned int* testImage;

    unsigned int randData[17] = {

        0x3A428472, 0x724B84D3, 0x26B898AB, 0x7D980E3C, 0x5345A084,

        0x6779B66B, 0x791EE4B4, 0x6E8EE3CC, 0x63AF504A, 0x18A21B33,

        0x0E26EB73, 0x022F708E, 0x1740F3B0, 0x7E2C699D, 0x0E8A570B,

        0x5F2C22FB, 0x6A742130

    };

    printf("Frame Buffer Performance test...\n");

    for (run=0; run<PERFORMANCE_RUN_COUNT; ++run) {

        /* Generate test image with random(ish) data: */

        testImage = (unsigned int*) malloc(fbSize);

        j = run;

        for (i=0; i < (int)(fbSize / sizeof(int)); ++i) {

            testImage[i] = randData[j];

            j++;

            if (j >= 17)

                j = 0;

        }

        gettimeofday(&startTime, NULL);

        memcpy(fb, testImage, fbSize);

        gettimeofday(&endTime, NULL);

        long secsDiff = endTime.tv_sec - startTime.tv_sec;

        results[run] = secsDiff * 1000000 + (endTime.tv_usec - startTime.tv_usec);

        free(testImage);

    }

    average = 0;

    for (i=0; i<PERFORMANCE_RUN_COUNT; ++i)

        average += results[i];

    average = average / PERFORMANCE_RUN_COUNT;

    printf("        Average:   %llu usecs\n", average);

    printf("        Bandwidth: %.03f MByte/Sec\n", (fbSize / 1048576.0) / ((double)average / 1000000.0));

    printf("        Max. FPS:  %.03f fps\n\n", 1000000.0 / (double)average);

    /* Clear the framebuffer back to black again: */

    memset(fb, 0, fbSize);

}

int main(int argc, char **argv)

{

    long int screensize = 0;

    int doGraphicsMode = 1;

    long oldKdMode = KD_TEXT;

    const char *devfile = "/dev/fb0";

    int nextArg = 1;

    if (nextArg < argc) {

        if (strncmp("nographicsmodeswitch", argv[nextArg],

                    strlen("nographicsmodeswitch")) == 0)

        {

	    ++nextArg;

            doGraphicsMode = 0;

        }

    }

    if (nextArg < argc)

	devfile = argv[nextArg++];

    /* Open the file for reading and writing */

    fbFd = open(devfile, O_RDWR);

    if (fbFd == -1) {

	perror("Error: cannot open framebuffer device");

	exit(1);

    }

    printf("The framebuffer device was opened successfully.\n\n");

    /* Get fixed screen information */

    if (ioctl(fbFd, FBIOGET_FSCREENINFO, &finfo) == -1) {

	perror("Error reading fixed information");

	exit(2);

    }

    printFixedInfo();

    /* Figure out the size of the screen in bytes */

    screensize = finfo.smem_len;

    /* Map the device to memory */

    frameBuffer = (char *)mmap(0, screensize,

                               PROT_READ | PROT_WRITE, MAP_SHARED,

                               fbFd, 0);

    if (frameBuffer == MAP_FAILED) {

	perror("Error: Failed to map framebuffer device to memory");

	exit(4);

    }