/**

 * MojoShader; generate shader programs from bytecode of compiled

 *  Direct3D shaders.

 *

 * Please see the file LICENSE.txt in the source's root directory.

 *

 *  This file written by Ryan C. Gordon.

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <stdarg.h>

#include <sys/types.h>

#include <errno.h>

#include "mojoshader.h"

#if FINDERRORS_COMPILE_SHADERS

#include "SDL.h"

static SDL_Window *sdlwindow = NULL;

static void *lookup(const char *fnname, void *unused)

{

    (void) unused;

    return SDL_GL_GetProcAddress(fnname);

} // lookup

#endif

#ifdef _MSC_VER

#define WIN32_LEAN_AND_MEAN 1

#include <windows.h>

#include <malloc.h>  // for alloca().

#define snprintf _snprintf

#else

#include <dirent.h>

#include <sys/stat.h>

#endif

#define report printf

static int isdir(const char *dname)

{

#ifdef _MSC_VER

    WIN32_FILE_ATTRIBUTE_DATA winstat;

    if (!GetFileAttributesExA(dname, GetFileExInfoStandard, &winstat))

        return 0;

    return winstat.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;

#else

    struct stat statbuf;

    if (stat(dname, &statbuf) == -1)

        return 0;

    return S_ISDIR(statbuf.st_mode);

#endif

}

static int do_dir(const char *dname, const char *profile);

static int do_file(const char *profile, const char *dname, const char *fn, int *total)

{

    int do_quit = 0;

    if ((strcmp(fn, ".") == 0) || (strcmp(fn, "..") == 0))

        return 1;  // skip these.

    #if FINDERRORS_COMPILE_SHADERS

    SDL_Event e;  // pump event queue to keep OS happy.

    while (SDL_PollEvent(&e))

    {

        if (e.type == SDL_QUIT)

            do_quit = 1;

    } // while

    SDL_GL_SwapWindow(sdlwindow);

    #endif

    if (do_quit)

    {

        report("FAIL: user requested quit!\n");

        return 0;

    } // if

    char *fname = (char *) alloca(strlen(fn) + strlen(dname) + 2);

    sprintf(fname, "%s/%s", dname, fn);

    if (isdir(fname))

    {

        *total += do_dir(fname, profile);

        return 1;

    } // if

    int assembly = 0;

    if (strstr(fn, ".bytecode") != NULL)

        assembly = 0;

    else if (strstr(fn, ".disasm") != NULL)

        assembly = 1;

    else

        return 1;

    (*total)++;

    FILE *io = fopen(fname, "rb");

    if (io == NULL)

    {

        report("FAIL: %s fopen() failed.\n", fname);

        return 1;

    } // if

    static unsigned char buf[1024 * 256];

    int rc = fread(buf, 1, sizeof (buf), io);

    fclose(io);

    if (rc == -1)

    {

        report("FAIL: %s %s\n", fname, strerror(errno));

        return 1;

    } // if

    if (assembly)

    {

        const MOJOSHADER_parseData *a;

        buf[rc] = '\0';  // make sure the source is null-terminated.

        a = MOJOSHADER_assemble(fname, (char *) buf, rc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);

        if (a->error_count > 0)

        {

            report("FAIL: %s (line %d) %s\n",

                a->errors[0].filename ? a->errors[0].filename : "???",

                a->errors[0].error_position,

                a->errors[0].error);

            return 1;

        } // if

        else if (a->output_len > sizeof (buf))

        {

            report("FAIL: %s buffer overflow in finderrors.c\n", fname);

            return 1;

        } // if

        rc = a->output_len;

        memcpy(buf, a->output, rc);

        MOJOSHADER_freeParseData(a);

    } // if

    #if FINDERRORS_COMPILE_SHADERS

    MOJOSHADER_glShader *shader = MOJOSHADER_glCompileShader(buf, rc, NULL, 0, NULL, 0);

    if (shader == NULL)

        report("FAIL: %s %s\n", fname, MOJOSHADER_glGetError());

    else

    {

        const MOJOSHADER_parseData *pd = MOJOSHADER_glGetShaderParseData(shader);

        MOJOSHADER_glShader *v = (pd->shader_type == MOJOSHADER_TYPE_VERTEX) ? shader : NULL;

        MOJOSHADER_glShader *p = (pd->shader_type == MOJOSHADER_TYPE_PIXEL) ? shader : NULL;

        MOJOSHADER_glProgram *program = MOJOSHADER_glLinkProgram(v, p);

        if (program == NULL)

            report("FAIL: %s %s\n", fname, MOJOSHADER_glGetError());

        else

        {

            report("PASS: %s\n", fname);

            MOJOSHADER_glDeleteProgram(program);

        } // else

        MOJOSHADER_glDeleteShader(shader);

    }

    #else

    const MOJOSHADER_parseData *pd = MOJOSHADER_parse(profile, NULL, buf, rc, NULL, 0, NULL, 0, NULL, NULL, NULL);

    if (pd->error_count == 0)

        report("PASS: %s\n", fname);

	else

	{

		int i;

		for (i = 0; i < pd->error_count; i++)

		{

			report("FAIL: %s (position %d) %s\n", pd->errors[i].filename,

			       pd->errors[i].error_position, pd->errors[i].error);

		} // for

	} // else

    MOJOSHADER_freeParseData(pd);

    #endif

    return 1;

} // do_file

static int do_dir(const char *dname, const char *profile)

{

    int total = 0;

#ifdef _MSC_VER

	const size_t wildcardlen = strlen(dname) + 3;

	char *wildcard = (char *) alloca(wildcardlen);

	SDL_snprintf(wildcard, wildcardlen, "%s\\*", dname);

    WIN32_FIND_DATAA dent;

    HANDLE dirp = FindFirstFileA(wildcard, &dent);

    if (dirp != INVALID_HANDLE_VALUE)

    {

        do

        {

            if (!do_file(profile, dname, dent.cFileName, &total))

                break;

        } while (FindNextFileA(dirp, &dent) != 0);

        FindClose(dirp);

    } // if

#else

    struct dirent *dent = NULL;

    DIR *dirp = opendir(dname);

    if (dirp != NULL)

    {

        while ((dent = readdir(dirp)) != NULL)

        {

            if (!do_file(profile, dname, dent->d_name, &total))

                break;

        } // while

        closedir(dirp);

    } // if

#endif

    return total;

} // do_dir

int main(int argc, char **argv)

{

    //printf("MojoShader finderrors\n");

    //printf("Compiled against changeset %s\n", MOJOSHADER_CHANGESET);

    //printf("Linked against changeset %s\n", MOJOSHADER_changeset());

    //printf("\n");

    if (argc <= 2)

        printf("\n\nUSAGE: %s <profile> [dir1] ... [dirN]\n\n", argv[0]);

    else

    {

        int okay = 0;

        int total = 0;

        int i;

        const char *profile = argv[1];

        #if FINDERRORS_COMPILE_SHADERS

        MOJOSHADER_glContext *ctx = NULL;

        if (SDL_Init(SDL_INIT_VIDEO) == -1)

            fprintf(stderr, "SDL_Init() error: %s\n", SDL_GetError());

        else if (SDL_GL_LoadLibrary(NULL) == -1)

            fprintf(stderr, "SDL_GL_LoadLibrary() error: %s\n", SDL_GetError());

        else if ((sdlwindow = SDL_CreateWindow(argv[0], SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_OPENGL)) == NULL)

            fprintf(stderr, "SDL_CreateWindow() error: %s\n", SDL_GetError());

        else if (SDL_GL_CreateContext(sdlwindow) == NULL)

            fprintf(stderr, "SDL_GL_CreateContext() error: %s\n", SDL_GetError());

        else if ((ctx = MOJOSHADER_glCreateContext(profile, lookup, 0, 0, 0, 0)) == NULL)

            fprintf(stderr, "MOJOSHADER_glCreateContext() fail: %s\n", MOJOSHADER_glGetError());

        else

        {

            printf("Best profile is '%s'\n", MOJOSHADER_glBestProfile(lookup, 0, NULL, NULL, NULL));

            MOJOSHADER_glMakeContextCurrent(ctx);

            okay = 1;

        }

        #else

        okay = 1;

        #endif

        if (okay)

        {

            for (i = 2; i < argc; i++)

                total += do_dir(argv[i], profile);

            printf("Saw %d files.\n", total);

        } // if

        #if FINDERRORS_COMPILE_SHADERS

        if (ctx)

            MOJOSHADER_glDestroyContext(ctx);

        SDL_Quit();

        #endif

    } // else

    return 0;

} // main

// end of finderrors.c ...