/*
 * Benchmarks surface-to-surface blits in various formats.
 *
 *  Written by Ryan C. Gordon.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL.h"

static SDL_Surface *dest = NULL;
static SDL_Surface *src = NULL;
static int testSeconds = 10;


static int percent(int val, int total)
{
    return((int) ((((float) val) / ((float) total)) * 100.0f));
}

static int randRange(int lo, int hi)
{
    return(lo + (int) (((double) hi)*rand()/(RAND_MAX+1.0)));
}

static void copy_trunc_str(char *str, size_t strsize, const char *flagstr)
{
    if ( (strlen(str) + strlen(flagstr)) >= (strsize - 1) )
        strcpy(str + (strsize - 5), " ...");
    else
        strcat(str, flagstr);
}

static void __append_sdl_surface_flag(SDL_Surface *_surface, char *str,
                                      size_t strsize, Uint32 flag,
                                      const char *flagstr)
{
    if (_surface->flags & flag)
        copy_trunc_str(str, strsize, flagstr);
} /* append_sdl_surface_flag */


#define append_sdl_surface_flag(a, b, c, fl) __append_sdl_surface_flag(a, b, c, fl, " " #fl)
#define print_tf_state(str, val) printf("%s: {%s}\n", str, (val) ? "true" : "false" )

static void output_surface_details(const char *name, SDL_Surface *surface)
{
    printf("Details for %s:\n", name);

    if (surface == NULL)
    {
        printf("-WARNING- You've got a NULL surface!");
    }
    else
    {
        char f[256];
        printf("  width  : %d\n", surface->w);
        printf("  height : %d\n", surface->h);
        printf("  depth  : %d bits per pixel\n", surface->format->BitsPerPixel);
        printf("  pitch  : %d\n", (int) surface->pitch);

        printf("  red    : 0x%08X mask, %d shift, %d loss\n",
                    (int) surface->format->Rmask,
                    (int) surface->format->Rshift,
                    (int) surface->format->Rloss);
        printf("  green  : 0x%08X mask, %d shift, %d loss\n",
                    (int) surface->format->Gmask,
                    (int) surface->format->Gshift,
                    (int) surface->format->Gloss);
        printf("  blue   : 0x%08X mask, %d shift, %d loss\n",
                    (int) surface->format->Bmask,
                    (int) surface->format->Bshift,
                    (int) surface->format->Bloss);
        printf("  alpha  : 0x%08X mask, %d shift, %d loss\n",
                    (int) surface->format->Amask,
                    (int) surface->format->Ashift,
                    (int) surface->format->Aloss);

        f[0] = '\0';

        /*append_sdl_surface_flag(surface, f, sizeof (f), SDL_SWSURFACE);*/
        if ((surface->flags & SDL_HWSURFACE) == 0)
            copy_trunc_str(f, sizeof (f), " SDL_SWSURFACE");

        append_sdl_surface_flag(surface, f, sizeof (f), SDL_HWSURFACE);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_ASYNCBLIT);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_ANYFORMAT);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_HWPALETTE);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_DOUBLEBUF);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_FULLSCREEN);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_OPENGL);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_OPENGLBLIT);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_RESIZABLE);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_NOFRAME);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_HWACCEL);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_SRCCOLORKEY);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_RLEACCELOK);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_RLEACCEL);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_SRCALPHA);
        append_sdl_surface_flag(surface, f, sizeof (f), SDL_PREALLOC);

        if (f[0] == '\0')
            strcpy(f, " (none)");

        printf("  flags  :%s\n", f);

        #if 0
        info = SDL_GetVideoInfo();
        assert(info != NULL);

        print_tf_state("hardware surface available", info->hw_available);
        print_tf_state("window manager available", info->wm_available);
        print_tf_state("accelerated hardware->hardware blits", info->blit_hw);
        print_tf_state("accelerated hardware->hardware colorkey blits", info->blit_hw_CC);
        print_tf_state("accelerated hardware->hardware alpha blits", info->blit_hw_A);
        print_tf_state("accelerated software->hardware blits", info->blit_sw);
        print_tf_state("accelerated software->hardware colorkey blits", info->blit_sw_CC);
        print_tf_state("accelerated software->hardware alpha blits", info->blit_sw_A);
        print_tf_state("accelerated color fills", info->blit_fill);

        printf("video memory: (%d)\n", info->video_mem);
        #endif
    } /* else */

    printf("\n");
}

static void output_details(void)
{
    output_surface_details("Source Surface", src);
    output_surface_details("Destination Surface", dest);
}

static Uint32 blit(SDL_Surface *dst, SDL_Surface *src, int x, int y)
{
    Uint32 start = 0;
    SDL_Rect srcRect;
    SDL_Rect dstRect;

    srcRect.x = 0;
    srcRect.y = 0;
    dstRect.x = x;
    dstRect.y = y;
    dstRect.w = srcRect.w = src->w;  /* SDL will clip as appropriate. */
    dstRect.h = srcRect.h = src->h;

    start = SDL_GetTicks();
    SDL_BlitSurface(src, &srcRect, dst, &dstRect);
    return(SDL_GetTicks() - start);
}

static void blitCentered(SDL_Surface *dst, SDL_Surface *src)
{
    int x = (dst->w - src->w) / 2;
    int y = (dst->h - src->h) / 2;
    blit(dst, src, x, y);
}

static int atoi_hex(const char *str)
{
    if (str == NULL)
        return 0;

    if (strlen(str) > 2)
    {
        int retval = 0;
        if ((str[0] == '0') && (str[1] == 'x'))
            sscanf(str + 2, "%X", &retval);
        return(retval);
    }

    return(atoi(str));
}


static int setup_test(int argc, char **argv)
{
    const char *dumpfile = NULL;
    SDL_Surface *bmp = NULL;
    Uint32 dstbpp = 32;
    Uint32 dstrmask = 0x00FF0000;
    Uint32 dstgmask = 0x0000FF00;
    Uint32 dstbmask = 0x000000FF;
    Uint32 dstamask = 0x00000000;
    Uint32 dstflags = 0;
    int dstw = 640;
    int dsth = 480;
    Uint32 srcbpp = 32;
    Uint32 srcrmask = 0x00FF0000;
    Uint32 srcgmask = 0x0000FF00;
    Uint32 srcbmask = 0x000000FF;
    Uint32 srcamask = 0x00000000;
    Uint32 srcflags = 0;
    int srcw = 640;
    int srch = 480;
    int screenSurface = 0;
    int i;

    for (i = 1; i < argc; i++)
    {
        const char *arg = argv[i];

        if (strcmp(arg, "--dstbpp") == 0)
            dstbpp = atoi(argv[++i]);
        else if (strcmp(arg, "--dstrmask") == 0)
            dstrmask = atoi_hex(argv[++i]);
        else if (strcmp(arg, "--dstgmask") == 0)
            dstgmask = atoi_hex(argv[++i]);
        else if (strcmp(arg, "--dstbmask") == 0)
            dstbmask = atoi_hex(argv[++i]);
        else if (strcmp(arg, "--dstamask") == 0)
            dstamask = atoi_hex(argv[++i]);
        else if (strcmp(arg, "--dstwidth") == 0)
            dstw = atoi(argv[++i]);
        else if (strcmp(arg, "--dstheight") == 0)
            dsth = atoi(argv[++i]);
        else if (strcmp(arg, "--dsthwsurface") == 0)
            dstflags |= SDL_HWSURFACE;
        else if (strcmp(arg, "--srcbpp") == 0)
            srcbpp = atoi(argv[++i]);
        else if (strcmp(arg, "--srcrmask") == 0)
            srcrmask = atoi_hex(argv[++i]);
        else if (strcmp(arg, "--srcgmask") == 0)
            srcgmask = atoi_hex(argv[++i]);
        else if (strcmp(arg, "--srcbmask") == 0)
            srcbmask = atoi_hex(argv[++i]);
        else if (strcmp(arg, "--srcamask") == 0)
            srcamask = atoi_hex(argv[++i]);
        else if (strcmp(arg, "--srcwidth") == 0)
            srcw = atoi(argv[++i]);
        else if (strcmp(arg, "--srcheight") == 0)
            srch = atoi(argv[++i]);
        else if (strcmp(arg, "--srchwsurface") == 0)
            srcflags |= SDL_HWSURFACE;
        else if (strcmp(arg, "--seconds") == 0)
            testSeconds = atoi(argv[++i]);
        else if (strcmp(arg, "--screen") == 0)
            screenSurface = 1;
        else if (strcmp(arg, "--dumpfile") == 0)
            dumpfile = argv[++i];
        else
        {
            fprintf(stderr, "Unknown commandline option: %s\n", arg);
            return(0);
        }
    }

    if (SDL_Init(SDL_INIT_VIDEO) == -1)
    {
        fprintf(stderr, "SDL_Init failed: %s\n", SDL_GetError());
        return(0);
    }

    bmp = SDL_LoadBMP("sample.bmp");
    if (bmp == NULL)
    {
        fprintf(stderr, "SDL_LoadBMP failed: %s\n", SDL_GetError());
        SDL_Quit();
        return(0);
    }

    if ((dstflags & SDL_HWSURFACE) == 0) dstflags |= SDL_SWSURFACE;
    if ((srcflags & SDL_HWSURFACE) == 0) srcflags |= SDL_SWSURFACE;

    if (screenSurface)
        dest = SDL_SetVideoMode(dstw, dsth, dstbpp, dstflags);
    else
    {
        dest = SDL_CreateRGBSurface(dstflags, dstw, dsth, dstbpp,
                                    dstrmask, dstgmask, dstbmask, dstamask);
    }

    if (dest == NULL)
    {
        fprintf(stderr, "dest surface creation failed: %s\n", SDL_GetError());
        SDL_Quit();
        return(0);
    }

    src = SDL_CreateRGBSurface(srcflags, srcw, srch, srcbpp,
                               srcrmask, srcgmask, srcbmask, srcamask);
    if (src == NULL)
    {
        fprintf(stderr, "src surface creation failed: %s\n", SDL_GetError());
        SDL_Quit();
        return(0);
    }

    /* set some sane defaults so we can see if the blit code is broken... */
    SDL_FillRect(dest, NULL, SDL_MapRGB(dest->format, 0, 0, 0));
    SDL_FillRect(src, NULL, SDL_MapRGB(src->format, 0, 0, 0));

    blitCentered(src, bmp);
    SDL_FreeSurface(bmp);

    if (dumpfile)
        SDL_SaveBMP(src, dumpfile);  /* make sure initial convert is sane. */

    output_details();

    return(1);
}


static void test_blit_speed(void)
{
    Uint32 clearColor = SDL_MapRGB(dest->format, 0, 0, 0);
    Uint32 iterations = 0;
    Uint32 elasped = 0;
    Uint32 end = 0;
    Uint32 now = 0;
    Uint32 last = 0;
    int testms = testSeconds * 1000;
    int wmax = (dest->w - src->w);
    int hmax = (dest->h - src->h);
    int isScreen = (SDL_GetVideoSurface() == dest);
    SDL_Event event;

    printf("Testing blit speed for %d seconds...\n", testSeconds);

    now = SDL_GetTicks();
    end = now + testms;

    do
    {
        /* pump the event queue occasionally to keep OS happy... */
        if (now - last > 1000)
        {
            last = now;
            while (SDL_PollEvent(&event)) { /* no-op. */ }
        }

        iterations++;
        elasped += blit(dest, src, randRange(0, wmax), randRange(0, hmax));
        if (isScreen)
        {
            SDL_Flip(dest);  /* show it! */
            SDL_FillRect(dest, NULL, clearColor); /* blank it for next time! */
        }

        now = SDL_GetTicks();
    } while (now < end);

    printf("Non-blitting crap accounted for %d percent of this run.\n",
            percent(testms - elasped, testms));

    printf("%d blits took %d ms (%d fps).\n",
            (int) iterations,
            (int) elasped,
            (int) (((float)iterations) / (((float)elasped) / 1000.0f)));
}

int main(int argc, char **argv)
{
    int initialized = setup_test(argc, argv);
    if (initialized)
    {
        test_blit_speed();
        SDL_Quit();
    }
    return(!initialized);
}

/* end of testblitspeed.c ... */