/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#include "SDL_video.h"
#include "SDL_mouse.h"
#include "../SDL_sysvideo.h"
#include "../SDL_pixels_c.h"
#include "../../events/SDL_events_c.h"

#include "SDL_dcvideo.h"
#include "SDL_dcevents_c.h"
#include "SDL_dcmouse_c.h"

#include <dc/video.h>
#include <dc/pvr.h>


/* Initialization/Query functions */
static int DC_VideoInit(_THIS, SDL_PixelFormat * vformat);
static SDL_Rect **DC_ListModes(_THIS, SDL_PixelFormat * format, Uint32 flags);
static SDL_Surface *DC_SetVideoMode(_THIS, SDL_Surface * current, int width,
                                    int height, int bpp, Uint32 flags);
static int DC_SetColors(_THIS, int firstcolor, int ncolors,
                        SDL_Color * colors);
static void DC_VideoQuit(_THIS);

/* Hardware surface functions */
static int DC_AllocHWSurface(_THIS, SDL_Surface * surface);
static int DC_LockHWSurface(_THIS, SDL_Surface * surface);
static void DC_UnlockHWSurface(_THIS, SDL_Surface * surface);
static void DC_FreeHWSurface(_THIS, SDL_Surface * surface);
static int DC_FlipHWSurface(_THIS, SDL_Surface * surface);

/* etc. */
static void DC_UpdateRects(_THIS, int numrects, SDL_Rect * rects);

/* OpenGL */
#if SDL_VIDEO_OPENGL
static void *DC_GL_GetProcAddress(_THIS, const char *proc);
static int DC_GL_LoadLibrary(_THIS, const char *path);
static int DC_GL_GetAttribute(_THIS, SDL_GLattr attrib, int *value);
static void DC_GL_SwapBuffers(_THIS);
#endif

/* DC driver bootstrap functions */

static int
DC_Available(void)
{
    return 1;
}

static void
DC_DeleteDevice(SDL_VideoDevice * device)
{
    SDL_free(device->hidden);
    SDL_free(device);
}

static SDL_VideoDevice *
DC_CreateDevice(int devindex)
{
    SDL_VideoDevice *device;

    /* Initialize all variables that we clean on shutdown */
    device = (SDL_VideoDevice *) SDL_malloc(sizeof(SDL_VideoDevice));
    if (device) {
        SDL_memset(device, 0, (sizeof *device));
        device->hidden = (struct SDL_PrivateVideoData *)
            SDL_malloc((sizeof *device->hidden));
    }
    if ((device == NULL) || (device->hidden == NULL)) {
        SDL_OutOfMemory();
        if (device) {
            SDL_free(device);
        }
        return (0);
    }
    SDL_memset(device->hidden, 0, (sizeof *device->hidden));

    /* Set the function pointers */
    device->VideoInit = DC_VideoInit;
    device->ListModes = DC_ListModes;
    device->SetVideoMode = DC_SetVideoMode;
    device->CreateYUVOverlay = NULL;
    device->SetColors = DC_SetColors;
    device->UpdateRects = DC_UpdateRects;
    device->VideoQuit = DC_VideoQuit;
    device->AllocHWSurface = DC_AllocHWSurface;
    device->CheckHWBlit = NULL;
    device->FillHWRect = NULL;
    device->SetHWColorKey = NULL;
    device->SetHWAlpha = NULL;
    device->LockHWSurface = DC_LockHWSurface;
    device->UnlockHWSurface = DC_UnlockHWSurface;
    device->FlipHWSurface = DC_FlipHWSurface;
    device->FreeHWSurface = DC_FreeHWSurface;
#if SDL_VIDEO_OPENGL
    device->GL_LoadLibrary = DC_GL_LoadLibrary;
    device->GL_GetProcAddress = DC_GL_GetProcAddress;
    device->GL_GetAttribute = DC_GL_GetAttribute;
    device->GL_MakeCurrent = NULL;
    device->GL_SwapBuffers = DC_GL_SwapBuffers;
#endif
    device->SetCaption = NULL;
    device->SetIcon = NULL;
    device->IconifyWindow = NULL;
    device->GrabInput = NULL;
    device->GetWMInfo = NULL;
    device->InitOSKeymap = DC_InitOSKeymap;
    device->PumpEvents = DC_PumpEvents;

    device->free = DC_DeleteDevice;

    return device;
}

VideoBootStrap DC_bootstrap = {
    "dcvideo", "Dreamcast Video",
    DC_Available, DC_CreateDevice
};


int
DC_VideoInit(_THIS, SDL_PixelFormat * vformat)
{
    /* Determine the screen depth (use default 16-bit depth) */
    /* we change this during the SDL_SetVideoMode implementation... */
    vformat->BitsPerPixel = 16;
    vformat->Rmask = 0x0000f800;
    vformat->Gmask = 0x000007e0;
    vformat->Bmask = 0x0000001f;

    /* We're done! */
    return (0);
}

const static SDL_Rect RECT_800x600 = { 0, 0, 800, 600 }, RECT_640x480 = {
0, 0, 640, 480}, RECT_320x240 = {
0, 0, 320, 240};

const static SDL_Rect *vid_modes[] = {
    &RECT_800x600,
    &RECT_640x480,
    &RECT_320x240,
    NULL
};

SDL_Rect **
DC_ListModes(_THIS, SDL_PixelFormat * format, Uint32 flags)
{
    switch (format->BitsPerPixel) {
    case 15:
    case 16:
        return &vid_modes;
    case 32:
        if (!(flags & SDL_INTERNALOPENGL))
            return &vid_modes;
    default:
        return NULL;
    }
//      return (SDL_Rect **) -1;
}

pvr_init_params_t params = {
    /* Enable opaque and translucent polygons with size 16 */
    {PVR_BINSIZE_16, PVR_BINSIZE_0, PVR_BINSIZE_16, PVR_BINSIZE_0,
     PVR_BINSIZE_16}
    ,

    /* Vertex buffer size */
    512 * 1024
};

#if SDL_VIDEO_OPENGL
static int pvr_inited;
#endif

SDL_Surface *
DC_SetVideoMode(_THIS, SDL_Surface * current,
                int width, int height, int bpp, Uint32 flags)
{
    int disp_mode, pixel_mode, pitch;
    Uint32 Rmask, Gmask, Bmask;

    if (width == 320 && height == 240)
        disp_mode = DM_320x240;
    else if (width == 640 && height == 480)
        disp_mode = DM_640x480;
    else if (width == 800 && height == 600)
        disp_mode = DM_800x608;
    else {
        SDL_SetError("Couldn't find requested mode in list");
        return (NULL);
    }

    switch (bpp) {
    case 15:
        pixel_mode = PM_RGB555;
        pitch = width * 2;
        /* 5-5-5 */
        Rmask = 0x00007c00;
        Gmask = 0x000003e0;
        Bmask = 0x0000001f;
        break;
    case 16:
        pixel_mode = PM_RGB565;
        pitch = width * 2;
        /* 5-6-5 */
        Rmask = 0x0000f800;
        Gmask = 0x000007e0;
        Bmask = 0x0000001f;
        break;
    case 24:
        bpp = 32;
    case 32:
        pixel_mode = PM_RGB888;
        pitch = width * 4;
        Rmask = 0x00ff0000;
        Gmask = 0x0000ff00;
        Bmask = 0x000000ff;
#if SDL_VIDEO_OPENGL
        if (!(flags & SDL_INTERNALOPENGL))
#endif
            break;
    default:
        SDL_SetError("Couldn't find requested mode in list");
        return (NULL);
    }

//  if ( bpp != current->format->BitsPerPixel ) {
    if (!SDL_ReallocFormat(current, bpp, Rmask, Gmask, Bmask, 0)) {
        return (NULL);
    }
//  }

    /* Set up the new mode framebuffer */
    current->flags = (SDL_FULLSCREEN | SDL_HWSURFACE);
    current->w = width;
    current->h = height;
    current->pitch = pitch;

#if SDL_VIDEO_OPENGL
    if (pvr_inited) {
        pvr_inited = 0;
        pvr_shutdown();
    }
#endif

    vid_set_mode(disp_mode, pixel_mode);

    current->pixels = vram_s;

#if SDL_VIDEO_OPENGL
    if (flags & SDL_INTERNALOPENGL) {
        this->gl_config.driver_loaded = 1;
        current->flags = SDL_FULLSCREEN | SDL_INTERNALOPENGL;
        current->pixels = NULL;
        pvr_inited = 1;
        pvr_init(&params);
        glKosInit();
        glKosBeginFrame();
    } else
#endif
    if (flags | SDL_DOUBLEBUF) {
        current->flags |= SDL_DOUBLEBUF;
        current->pixels = (void *) ((int) current->pixels | 0x400000);
    }

    /* We're done */
    return (current);
}

/* We don't actually allow hardware surfaces other than the main one */
static int
DC_AllocHWSurface(_THIS, SDL_Surface * surface)
{
    return (-1);
}

static void
DC_FreeHWSurface(_THIS, SDL_Surface * surface)
{
    return;
}

/* We need to wait for vertical retrace on page flipped displays */
static int
DC_LockHWSurface(_THIS, SDL_Surface * surface)
{
    return (0);
}

static void
DC_UnlockHWSurface(_THIS, SDL_Surface * surface)
{
    return;
}

static int
DC_FlipHWSurface(_THIS, SDL_Surface * surface)
{
    if (surface->flags & SDL_DOUBLEBUF) {
        vid_set_start((int) surface->pixels & 0xffffff);
        surface->pixels = (void *) ((int) surface->pixels ^ 0x400000);
    }
    return (0);
}

static void
DC_UpdateRects(_THIS, int numrects, SDL_Rect * rects)
{
    /* do nothing. */
}

static int
DC_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color * colors)
{
    /* do nothing of note. */
    return (1);
}

/* Note:  If we are terminated, this could be called in the middle of
   another SDL video routine -- notably UpdateRects.
*/
static void
DC_VideoQuit(_THIS)
{
#if SDL_VIDEO_OPENGL
    if (pvr_inited) {
        pvr_inited = 0;
        pvr_shutdown();
    }
#endif
}

#if SDL_VIDEO_OPENGL

void
dmyfunc(void)
{
}

typedef void (*funcptr) ();
const static struct
{
    char *name;
    funcptr addr;
} glfuncs[] = {
#define	DEF(func)	{#func,&func}
    DEF(glBegin), DEF(glBindTexture), DEF(glBlendFunc), DEF(glColor4f),
//      DEF(glCopyImageID),
        DEF(glDisable),
        DEF(glEnable),
        DEF(glEnd),
        DEF(glFlush),
        DEF(glGenTextures),
        DEF(glGetString),
        DEF(glLoadIdentity),
        DEF(glMatrixMode), DEF(glOrtho), DEF(glPixelStorei),
//      DEF(glPopAttrib),
//      DEF(glPopClientAttrib),
    {
    "glPopAttrib", &dmyfunc}, {
    "glPopClientAttrib", &dmyfunc}, DEF(glPopMatrix),
//      DEF(glPushAttrib),
//      DEF(glPushClientAttrib),
    {
    "glPushAttrib", &dmyfunc}, {
    "glPushClientAttrib", &dmyfunc},
        DEF(glPushMatrix),
        DEF(glTexCoord2f),
        DEF(glTexEnvf),
        DEF(glTexImage2D),
        DEF(glTexParameteri),
        DEF(glTexSubImage2D), DEF(glVertex2i), DEF(glViewport),
#undef	DEF
};

static void *
DC_GL_GetProcAddress(_THIS, const char *proc)
{
    void *ret;
    int i;

    ret = glKosGetProcAddress(proc);
    if (ret)
        return ret;

    for (i = 0; i < sizeof(glfuncs) / sizeof(glfuncs[0]); i++) {
        if (SDL_strcmp(proc, glfuncs[i].name) == 0)
            return glfuncs[i].addr;
    }

    return NULL;
}

static int
DC_GL_LoadLibrary(_THIS, const char *path)
{
    this->gl_config.driver_loaded = 1;

    return 0;
}

static int
DC_GL_GetAttribute(_THIS, SDL_GLattr attrib, int *value)
{
    GLenum mesa_attrib;
    int val;

    switch (attrib) {
    case SDL_GL_RED_SIZE:
        val = 5;
        break;
    case SDL_GL_GREEN_SIZE:
        val = 6;
        break;
    case SDL_GL_BLUE_SIZE:
        val = 5;
        break;
    case SDL_GL_ALPHA_SIZE:
        val = 0;
        break;
    case SDL_GL_DOUBLEBUFFER:
        val = 1;
        break;
    case SDL_GL_DEPTH_SIZE:
        val = 16;               /* or 32? */
        break;
    case SDL_GL_STENCIL_SIZE:
        val = 0;
        break;
    case SDL_GL_ACCUM_RED_SIZE:
        val = 0;
        break;
    case SDL_GL_ACCUM_GREEN_SIZE:
        val = 0;
    case SDL_GL_ACCUM_BLUE_SIZE:
        val = 0;
        break;
    case SDL_GL_ACCUM_ALPHA_SIZE:
        val = 0;
        break;
    default:
        return -1;
    }
    *value = val;
    return 0;
}

static void
DC_GL_SwapBuffers(_THIS)
{
    glKosFinishFrame();
    glKosBeginFrame();
}
#endif
/* vi: set ts=4 sw=4 expandtab: */