/* Copyright (c) 2001, Stanford University
 * All rights reserved
 *
 * See the file LICENSE.txt for information on redistributing this software.
 */

#include "cr_error.h"
#include "cr_spu.h"
#include "cr_environment.h"
#include "stub.h"

/* I *know* most of the parameters are unused, dammit. */
#pragma warning( disable: 4100 )

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>

static GLuint desiredVisual = CR_RGB_BIT;


/**
 * Compute a mask of CR_*_BIT flags which reflects the attributes of
 * the pixel format of the given hdc.
 */
static GLuint ComputeVisBits( HDC hdc )
{
    PIXELFORMATDESCRIPTOR pfd; 
    int iPixelFormat;
    GLuint b = 0;

    iPixelFormat = GetPixelFormat( hdc );

    DescribePixelFormat( hdc, iPixelFormat, sizeof(pfd), &pfd );

    if (pfd.cDepthBits > 0)
        b |= CR_DEPTH_BIT;
    if (pfd.cAccumBits > 0)
        b |= CR_ACCUM_BIT;
    if (pfd.cColorBits > 8)
        b |= CR_RGB_BIT;
    if (pfd.cStencilBits > 0)
        b |= CR_STENCIL_BIT;
    if (pfd.cAlphaBits > 0)
        b |= CR_ALPHA_BIT;
    if (pfd.dwFlags & PFD_DOUBLEBUFFER)
        b |= CR_DOUBLE_BIT;
    if (pfd.dwFlags & PFD_STEREO)
        b |= CR_STEREO_BIT;

    return b;
}

int WINAPI wglChoosePixelFormat_prox( HDC hdc, CONST PIXELFORMATDESCRIPTOR *pfd )
{
    DWORD okayFlags;

    stubInit();

    /* 
     * NOTE!!!
     * Here we're telling the renderspu not to use the GDI
     * equivalent's of ChoosePixelFormat/DescribePixelFormat etc
     * There are subtle differences in the use of these calls.
     */
    crSetenv("CR_WGL_DO_NOT_USE_GDI", "yes");

    if ( pfd->nSize != sizeof(*pfd) || pfd->nVersion != 1 ) {
        crError( "wglChoosePixelFormat: bad pfd\n" );
        return 0;
    }

    okayFlags = ( PFD_DRAW_TO_WINDOW        |
            PFD_SUPPORT_GDI           |
            PFD_SUPPORT_OPENGL        |
            PFD_DOUBLEBUFFER          |
            PFD_DOUBLEBUFFER_DONTCARE |
            PFD_SWAP_EXCHANGE         |
            PFD_SWAP_COPY             |
            PFD_STEREO            |
            PFD_STEREO_DONTCARE       |
            PFD_DEPTH_DONTCARE        );
    if ( pfd->dwFlags & ~okayFlags ) {
        crWarning( "wglChoosePixelFormat: only support flags=0x%x, but you gave me flags=0x%x", okayFlags, pfd->dwFlags );
        return 0;
    }

    if ( pfd->iPixelType != PFD_TYPE_RGBA ) {
        crError( "wglChoosePixelFormat: only support RGBA\n" );
    }

    if ( pfd->cColorBits > 32 ||
            pfd->cRedBits   > 8  ||
            pfd->cGreenBits > 8  ||
            pfd->cBlueBits  > 8  ||
            pfd->cAlphaBits > 8 ) {
        crWarning( "wglChoosePixelFormat: too much color precision requested\n" );
    }

    if ( pfd->dwFlags & PFD_DOUBLEBUFFER )
        desiredVisual |= CR_DOUBLE_BIT;

    if ( pfd->dwFlags & PFD_STEREO )
        desiredVisual |= CR_STEREO_BIT;

    if ( pfd->cColorBits > 8)
        desiredVisual |= CR_RGB_BIT;

    if ( pfd->cAccumBits      > 0 ||
            pfd->cAccumRedBits   > 0 ||
            pfd->cAccumGreenBits > 0 ||
            pfd->cAccumBlueBits  > 0 ||
            pfd->cAccumAlphaBits > 0 ) {
        crWarning( "wglChoosePixelFormat: asked for accumulation buffer, ignoring\n" );
    }

    if ( pfd->cAccumBits > 0 )
        desiredVisual |= CR_ACCUM_BIT;

    if ( pfd->cDepthBits > 32 ) {
        crError( "wglChoosePixelFormat; asked for too many depth bits\n" );
    }
    
    if ( pfd->cDepthBits > 0 )
        desiredVisual |= CR_DEPTH_BIT;

    if ( pfd->cStencilBits > 8 ) {
        crError( "wglChoosePixelFormat: asked for too many stencil bits\n" );
    }

    if ( pfd->cStencilBits > 0 )
        desiredVisual |= CR_STENCIL_BIT;

    if ( pfd->cAuxBuffers > 0 ) {
        crError( "wglChoosePixelFormat: asked for aux buffers\n" );
    }

    if ( pfd->iLayerType != PFD_MAIN_PLANE ) {
        crError( "wglChoosePixelFormat: asked for a strange layer\n" );
    }

    return 1;
}

BOOL WINAPI wglSetPixelFormat_prox( HDC hdc, int pixelFormat, 
        CONST PIXELFORMATDESCRIPTOR *pdf )
{
    if ( pixelFormat != 1 ) {
        crError( "wglSetPixelFormat: pixelFormat=%d?\n", pixelFormat );
    }

    return 1;
}

BOOL WINAPI wglDeleteContext_prox( HGLRC hglrc )
{
    stubDestroyContext( (unsigned long) hglrc );
    return 1;
}

BOOL WINAPI wglMakeCurrent_prox( HDC hdc, HGLRC hglrc )
{
    ContextInfo *context;
    WindowInfo *window;

    context = (ContextInfo *) crHashtableSearch(stub.contextTable, (unsigned long) hglrc);
    window = stubGetWindowInfo(hdc);

    return stubMakeCurrent( window, context );
}

HGLRC WINAPI wglGetCurrentContext_prox( void )
{
    return (HGLRC) stub.currentContext;
}

HDC WINAPI wglGetCurrentDC_prox( void )
{
    if (stub.currentContext && stub.currentContext->currentDrawable)
        return (HDC) stub.currentContext->currentDrawable->drawable;
    else
        return (HDC) NULL;
}

int WINAPI wglGetPixelFormat_prox( HDC hdc )
{
    /* this is what we call our generic pixelformat, regardless of the HDC */
    return 1;
}

int WINAPI wglDescribePixelFormat_prox( HDC hdc, int pixelFormat, UINT nBytes,
        LPPIXELFORMATDESCRIPTOR pfd )
{
/*  if ( pixelFormat != 1 ) { 
 *      crError( "wglDescribePixelFormat: pixelFormat=%d?\n", pixelFormat ); 
 *      return 0; 
 *  } */

    if ( !pfd ) {
        crWarning( "wglDescribePixelFormat: pfd=NULL\n" );
        return 1; /* There's only one, baby */
    }

    if ( nBytes != sizeof(*pfd) ) {
        crWarning( "wglDescribePixelFormat: nBytes=%u?\n", nBytes );
        return 1; /* There's only one, baby */
    }

    pfd->nSize           = sizeof(*pfd);
    pfd->nVersion        = 1;
    pfd->dwFlags         = ( PFD_DRAW_TO_WINDOW |
                 PFD_SUPPORT_GDI    |
                 PFD_SUPPORT_OPENGL |
                 PFD_DOUBLEBUFFER );
    pfd->iPixelType      = PFD_TYPE_RGBA;
    pfd->cColorBits      = 32;
    pfd->cRedBits        = 8;
    pfd->cRedShift       = 24;
    pfd->cGreenBits      = 8;
    pfd->cGreenShift     = 16;
    pfd->cBlueBits       = 8;
    pfd->cBlueShift      = 8;
    pfd->cAlphaBits      = 8;
    pfd->cAlphaShift     = 0;
    pfd->cAccumBits      = 0;
    pfd->cAccumRedBits   = 0;
    pfd->cAccumGreenBits = 0;
    pfd->cAccumBlueBits  = 0;
    pfd->cAccumAlphaBits = 0;
    pfd->cDepthBits      = 32;
    pfd->cStencilBits    = 8;
    pfd->cAuxBuffers     = 0;
    pfd->iLayerType      = PFD_MAIN_PLANE;
    pfd->bReserved       = 0;
    pfd->dwLayerMask     = 0;
    pfd->dwVisibleMask   = 0;
    pfd->dwDamageMask    = 0;

    /* the max PFD index */
    return 1;
}

BOOL WINAPI wglShareLists_prox( HGLRC hglrc1, HGLRC hglrc2 )
{
    crWarning( "wglShareLists: unsupported" );
    return 0;
}


HGLRC WINAPI wglCreateContext_prox( HDC hdc )
{
    char dpyName[MAX_DPY_NAME];
    ContextInfo *context;

    stubInit();

    CRASSERT(stub.contextTable);

    sprintf(dpyName, "%d", hdc);
    if (stub.haveNativeOpenGL)
        desiredVisual |= ComputeVisBits( hdc );

    context = stubNewContext(dpyName, desiredVisual, UNDECIDED, 0);
    if (!context)
        return 0;

    return (HGLRC) context->id;
}

BOOL WINAPI
wglSwapBuffers_prox( HDC hdc )
{
    const WindowInfo *window = stubGetWindowInfo(hdc);
    stubSwapBuffers( window, 0 );
    return 1;
}

BOOL WINAPI wglCopyContext_prox( HGLRC src, HGLRC dst, UINT mask )
{
    crWarning( "wglCopyContext: unsupported" );
    return 0;
}

HGLRC WINAPI wglCreateLayerContext_prox( HDC hdc, int layerPlane )
{
    stubInit();
    crWarning( "wglCreateLayerContext: unsupported" );
    return 0;
}

PROC WINAPI wglGetProcAddress_prox( LPCSTR name )
{
    return (PROC) crGetProcAddress( name );
}

BOOL WINAPI wglUseFontBitmapsA_prox( HDC hdc, DWORD first, DWORD count, DWORD listBase )
{
    crWarning( "wglUseFontBitmapsA: unsupported" );
    return 0;
}

BOOL WINAPI wglUseFontBitmapsW_prox( HDC hdc, DWORD first, DWORD count, DWORD listBase )
{
    crWarning( "wglUseFontBitmapsW: unsupported" );
    return 0;
}

BOOL WINAPI wglDescribeLayerPlane_prox( HDC hdc, int pixelFormat, int layerPlane,
        UINT nBytes, LPLAYERPLANEDESCRIPTOR lpd )
{
    crWarning( "wglDescribeLayerPlane: unimplemented" );
    return 0;
}

int WINAPI wglSetLayerPaletteEntries_prox( HDC hdc, int layerPlane, int start,
        int entries, CONST COLORREF *cr )
{
    crWarning( "wglSetLayerPaletteEntries: unsupported" );
    return 0;
}

int WINAPI wglGetLayerPaletteEntries_prox( HDC hdc, int layerPlane, int start,
        int entries, COLORREF *cr )
{
    crWarning( "wglGetLayerPaletteEntries: unsupported" );
    return 0;
}

BOOL WINAPI wglRealizeLayerPalette_prox( HDC hdc, int layerPlane, BOOL realize )
{
    crWarning( "wglRealizeLayerPalette: unsupported" );
    return 0;
}

DWORD WINAPI wglSwapMultipleBuffers_prox( UINT a, CONST void *b )
{
    crWarning( "wglSwapMultipleBuffer: unsupported" );
    return 0;
}

BOOL WINAPI wglUseFontOutlinesA_prox( HDC hdc, DWORD first, DWORD count, DWORD listBase,
        FLOAT deviation, FLOAT extrusion, int format,
        LPGLYPHMETRICSFLOAT gmf )
{
    crWarning( "wglUseFontOutlinesA: unsupported" );
    return 0;
}

BOOL WINAPI wglUseFontOutlinesW_prox( HDC hdc, DWORD first, DWORD count, DWORD listBase,
        FLOAT deviation, FLOAT extrusion, int format,
        LPGLYPHMETRICSFLOAT gmf )
{
    crWarning( "wglUseFontOutlinesW: unsupported" );
    return 0;
}

BOOL WINAPI wglSwapLayerBuffers_prox( HDC hdc, UINT planes )
{
    crWarning( "wglSwapLayerBuffers: unsupported" );
    return 0;
}

BOOL WINAPI wglChoosePixelFormatEXT_prox(HDC hdc, const int *piAttributes, const FLOAT *pfAttributes, UINT nMaxFormats, int *piFormats, UINT *nNumFormats)
{
    int *pi;
    int wants_rgb = 0;

    stubInit();

    /* TODO : Need to check pfAttributes too ! */

    for ( pi = (int *)piAttributes; *pi != 0; pi++ )
    {
        switch ( *pi )
        {
            case WGL_COLOR_BITS_EXT:
                if (pi[1] > 8)
                    wants_rgb = 1;
                pi++;
                break;

            case WGL_RED_BITS_EXT:
            case WGL_GREEN_BITS_EXT:
            case WGL_BLUE_BITS_EXT:
                if (pi[1] > 3)
                    wants_rgb = 1;
                pi++;
                break;

            case WGL_ACCUM_ALPHA_BITS_EXT:
            case WGL_ALPHA_BITS_EXT:
                if (pi[1] > 0)
                    desiredVisual |= CR_ALPHA_BIT;
                pi++;
                break;

            case WGL_DOUBLE_BUFFER_EXT:
                if (pi[1] > 0)
                    desiredVisual |= CR_DOUBLE_BIT;
                pi++;
                break;

            case WGL_STEREO_EXT:
                if (pi[1] > 0)
                    desiredVisual |= CR_STEREO_BIT;
                pi++;
                break;

            case WGL_DEPTH_BITS_EXT:
                if (pi[1] > 0)
                    desiredVisual |= CR_DEPTH_BIT;
                pi++;
                break;

            case WGL_STENCIL_BITS_EXT:
                if (pi[1] > 0)
                    desiredVisual |= CR_STENCIL_BIT;
                pi++;
                break;

            case WGL_ACCUM_RED_BITS_EXT:
            case WGL_ACCUM_GREEN_BITS_EXT:
            case WGL_ACCUM_BLUE_BITS_EXT:
                if (pi[1] > 0)
                    desiredVisual |= CR_ACCUM_BIT;
                pi++;
                break;

            case WGL_SAMPLE_BUFFERS_EXT:
            case WGL_SAMPLES_EXT:
                if (pi[1] > 0)
                    desiredVisual |= CR_MULTISAMPLE_BIT;
                pi++;
                break;


            default:
                crWarning( "wglChoosePixelFormatEXT: bad pi=0x%x", *pi );
                return 0;
        }
    }

    return 1;
}

BOOL WINAPI wglGetPixelFormatAttribivEXT_prox(HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, int *piAttributes, int *pValues)
{
    /* TODO */

    return 1;
}

BOOL WINAPI wglGetPixelFormatAttribfvEXT_prox(HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, int *piAttributes, int *pValues)
{
    /* TODO */

    return 1;
}

const GLubyte * WINAPI wglGetExtensionsStringEXT_prox( HDC hdc )
{
    /*static GLubyte *retval = "WGL_EXT_pixel_format WGL_ARB_multisample";*/
    static GLubyte *retval = "WGL_ARB_multisample";

    (void) hdc;

    return retval;
}