/*
* Descent 3 
* Copyright (C) 2024 Parallax Software
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.

--- HISTORICAL COMMENTS FOLLOW ---

 * $Logfile: /DescentIII/Main/ddgr_win32/ddgrWin32API.cpp $
 * $Revision: 3 $
 * $Date: 9/12/97 4:13p $
 * $Author: Samir $
 *
 *	DDGR v2.0 Initialization and housekeeping for Win32
 *
 * $Log: /DescentIII/Main/ddgr_win32/ddgrWin32API.cpp $
 *
 * 3     9/12/97 4:13p Samir
 * Added some private data access functions and more DirectX
 * functionality.
 *
 * 2     6/13/97 3:01p Samir
 * Fixed flip assertions and error handling.
 *
 * 1     6/12/97 6:33p Samir
 * Initial revision
 *
 * $NoKeywords: $
 */

#include "ddgrWin32.h"
#include "ddgrWin32GDI.h"
#include "ddgrWin32DX.h"
#include "mono.h"
#include "pserror.h"

/*	Surface Functions
 */

/*	input:
                sf->name is optional.
                sf->w, sf->h, sf->bpp are mandatory
                sf->type and sf->flags are mandatory.
        output:
                sf->obj = surface object.
                sf->locks = 0
*/
bool ddgr_surf_Create(ddgr_surface *sf) {
  bool success;

  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    success = ddgr_gdi_surf_Create(sf);
    break;
  case DDGR_DX_SUBSYSTEM:
    success = ddgr_dx_surf_Create(sf);
    break;
  default:
    Int3();
  }

  if (!success) {
    ddgr_FatalError("Failed to create surface <%s>", sf->name);
  }

  return success;
}

void ddgr_surf_Destroy(ddgr_surface *sf) {
  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    ddgr_gdi_surf_Destroy(sf);
    break;
  case DDGR_DX_SUBSYSTEM:
    ddgr_dx_surf_Destroy(sf);
    break;
  default:
    Int3();
  }
}

/*	retrieves a pointer to surface memory.  allowed to lock one surface multiple times.
                ptr is the returned pointer to surface memory.  used to unlock surface also
                rowsize is the size in bytes of one row of memory.
*/
bool ddgr_surf_Lock(ddgr_surface *sf, void **ptr, int *rowsize) {
  bool success;

  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    success = ddgr_gdi_surf_Lock(sf, ptr, rowsize);
    break;
  case DDGR_DX_SUBSYSTEM:
    success = ddgr_dx_surf_Lock(sf, ptr, rowsize);
    break;
  default:
    Int3();
  }

  if (!success) {
    ddgr_FatalError("Failed to lock surface <%s>", sf->name);
  }

  return success;
}

bool ddgr_surf_Unlock(ddgr_surface *sf, void *ptr) {
  bool success;

  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    success = ddgr_gdi_surf_Unlock(sf, ptr);
    break;
  case DDGR_DX_SUBSYSTEM:
    success = ddgr_dx_surf_Unlock(sf, ptr);
    break;
  default:
    Int3();
  }

  if (!success) {
    ddgr_FatalError("Failed to unlock surface <%s>", sf->name);
  }

  return success;
}

//	attaches an OS handle to a surface
void ddgr_surf_AttachHandle(ddgr_surface *sf, unsigned handle) {
  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    ddgr_gdi_surf_AttachHandle(sf, handle);
    break;
  case DDGR_DX_SUBSYSTEM:
    ddgr_dx_surf_AttachHandle(sf, handle);
    break;
  default:
    Int3();
  }
}

/*	initializes a video screen from the given input surface which specifies the dimensions
        of the screen.
                sf->name is optional
                sf->w, sf->h are mandatory
                sf->bpp is recommended.  if set to BPP_DEFAULT, it uses the current display bit depth
                sf->type = SURFTYPE_VIDEOSCREEN
                sf->flags = 0 or SURFFLAG_BACKBUFFER.  surfaces with backbuffers allow rendering to
                                                them and display via flip.  monopage surfaces don't have this luxury.
*/
bool ddgr_surf_InitVideo(ddgr_surface *sf) {
  bool success;

  ASSERT(sf->type == SURFTYPE_VIDEOSCREEN);

  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    success = ddgr_gdi_surf_InitVideo(sf);
    break;
  case DDGR_DX_SUBSYSTEM:
    success = ddgr_dx_surf_InitVideo(sf);
    break;
  default:
    Int3();
  }

  if (!success) {
    ddgr_FatalError("Failed to initialize video screen <%s>", sf->name);
  }

  return success;
}

/*	close video reverses the operation of init video for that surface.  the display should stay
        the same, but no more operations may occur to that surface through this library.
*/
void ddgr_surf_CloseVideo(ddgr_surface *sf) {
  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    ddgr_gdi_surf_CloseVideo(sf);
    break;
  case DDGR_DX_SUBSYSTEM:
    ddgr_dx_surf_CloseVideo(sf);
    break;
  default:
    Int3();
  }
}

/*	flips the buffers in a surface.  really only useful for video screens
 */
bool ddgr_surf_FlipVideo(ddgr_surface *sf) {
  bool success;

  //	don't report error if there's no backbuffer.
  if (!(sf->flags & SURFFLAG_BACKBUFFER))
    return true;

  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    success = ddgr_gdi_surf_FlipVideo(sf);
    break;
  case DDGR_DX_SUBSYSTEM:
    success = ddgr_dx_surf_FlipVideo(sf);
    break;
  default:
    Int3();
  }

  if (!success) {
    ddgr_FatalError("Failed to flip surface <%s>", sf->name);
  }

  return success;
}

/*	graphic primatives
 */
void ddgr_surf_Clear(ddgr_surface *dsf, ddgr_color col, int l, int t, int w, int h) {
  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    ddgr_gdi_surf_Clear(dsf, col, l, t, w, h);
    break;
  case DDGR_DX_SUBSYSTEM:
    ddgr_dx_surf_Clear(dsf, col, l, t, w, h);
    break;
  default:
    Int3();
  }
}

bool ddgr_surf_Blt(ddgr_surface *dsf, int dx, int dy, ddgr_surface *ssf, int sx, int sy, int sw, int sh) {
  bool success;

  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    success = ddgr_gdi_surf_Blt(dsf, dx, dy, ssf, sx, sy, sw, sh);
    break;
  case DDGR_DX_SUBSYSTEM:
    success = ddgr_dx_surf_Blt(dsf, dx, dy, ssf, sx, sy, sw, sh);
    break;
  default:
    Int3();
  }

  if (!success) {
    ddgr_FatalError("Failed to blt surface <%s> to <%s>", ssf->name, dsf->name);
  }

  return success;
}

//	returns internal information about an ddgr_surface (only to low level libraries, on par with the ddgr
//	library).
void ddgr_surf_GetPrivateData(ddgr_surface *sf, bool *ddraw_surf, uint32_t *object_ptr) {
  switch (LIB_DATA(subsystem)) {
  case DDGR_DX_SUBSYSTEM: {
    tDXSurface *bm = (tDXSurface *)sf->obj;
    *ddraw_surf = true;
    *object_ptr = (bm->backbuffer == true) ? (uint32_t)(bm->lpddsback) : (uint32_t)(bm->lpdds);
    break;
  }
  default:
    Int3();
  }
}

//	returns aspect ratio of current display.
float ddgr_GetAspectRatio() {
  float aspect_ratio = (float)((3.0 * GetSystemMetrics(SM_CXSCREEN)) / (4.0 * GetSystemMetrics(SM_CYSCREEN)));
  return aspect_ratio;
}

unsigned ddgr_GetDDrawObject() {
  switch (LIB_DATA(subsystem)) {
  case DDGR_GDIX_SUBSYSTEM:
  case DDGR_GDI_SUBSYSTEM:
    return (unsigned)(GDI_DATA(lpDD));
  case DDGR_DX_SUBSYSTEM:
    return (unsigned)(DX_DATA(lpDD));
  default:
    Int3();
  }

  return 0;
}