/*

    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 <dlfcn.h>

#include "SDL.h"

#include "SDL_ph_gl.h"

#if SDL_VIDEO_OPENGL

#if (_NTO_VERSION >= 630)

    /* PhotonGL functions */

    GLPH_DECLARE_FUNCS;

#endif /* 6.3.0 */

#if (_NTO_VERSION < 630)

void ph_GL_SwapBuffers(_THIS)

{

    PgSetRegion(PtWidgetRid(window));

    PdOpenGLContextSwapBuffers(oglctx);

}

#else

void ph_GL_SwapBuffers(_THIS)

{

    qnxgl_swap_buffers(oglbuffers);

}

#endif /* 6.3.0 */

int ph_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)

{

    switch (attrib)

    {

        case SDL_GL_DOUBLEBUFFER:

             *value=this->gl_config.double_buffer;

             break;

        case SDL_GL_STENCIL_SIZE:

             *value=this->gl_config.stencil_size;

             break;

        case SDL_GL_DEPTH_SIZE:

             *value=this->gl_config.depth_size;

             break;

#if (_NTO_VERSION >= 630)

        case SDL_GL_RED_SIZE:

             *value=this->gl_config.red_size;

             break;

        case SDL_GL_GREEN_SIZE:

             *value=this->gl_config.green_size;

             break;

        case SDL_GL_BLUE_SIZE:

             *value=this->gl_config.blue_size;

             break;

        case SDL_GL_ALPHA_SIZE:

             *value=this->gl_config.alpha_size;

             break;

        case SDL_GL_ACCUM_RED_SIZE:

             *value=this->gl_config.accum_red_size;

             break;

        case SDL_GL_ACCUM_GREEN_SIZE:

             *value=this->gl_config.accum_green_size;

             break;

        case SDL_GL_ACCUM_BLUE_SIZE:

             *value=this->gl_config.accum_blue_size;

             break;

        case SDL_GL_ACCUM_ALPHA_SIZE:

             *value=this->gl_config.accum_alpha_size;

             break;

        case SDL_GL_STEREO:

             *value=this->gl_config.stereo;

             break;

#endif /* 6.3.0 */

        default:

             *value=0;

             return(-1);

    }

    return 0;

}

#if (_NTO_VERSION < 630)

int ph_GL_LoadLibrary(_THIS, const char* path)

{

    /* if code compiled with SDL_VIDEO_OPENGL, that mean that library already linked */

    this->gl_config.driver_loaded = 1;

    return 0;

}

#else

int ph_GL_LoadLibrary(_THIS, const char* path)

{

    void* handle;

    int dlopen_flags=RTLD_WORLD | RTLD_GROUP;

    if (this->gl_config.dll_handle!=NULL)

    {

        return 0;

    }

    handle = dlopen(path, dlopen_flags);

    if (handle==NULL)

    {

        SDL_SetError("ph_GL_LoadLibrary(): Could not load OpenGL library");

        return -1;

    }

    this->gl_config.dll_handle = handle;

    this->gl_config.driver_loaded = 1;

    SDL_strlcpy(this->gl_config.driver_path, path, SDL_arraysize(this->gl_config.driver_path));

    return 0;

}

#endif /* 6.3.0 */

#if (_NTO_VERSION < 630)

void* ph_GL_GetProcAddress(_THIS, const char* proc)

{

    return NULL;

}

#else

void* ph_GL_GetProcAddress(_THIS, const char* proc)

{

    void* function;

    if (this->gl_config.dll_handle==NULL)

    {

        ph_GL_LoadLibrary(this, DEFAULT_OPENGL);

        if (this->gl_config.dll_handle==NULL)

        {

            return NULL;

        }

    }

    function=qnxgl_get_func(proc, oglctx, 0);

    if (function==NULL)

    {

        function=dlsym(this->gl_config.dll_handle, proc);

    }

    return function;

}

#endif /* 6.3.0 */

#if (_NTO_VERSION < 630)

int ph_GL_MakeCurrent(_THIS)

{

    PgSetRegion(PtWidgetRid(window));

    if (oglctx!=NULL)

    {

        PhDCSetCurrent(oglctx);

    }

    return 0;

}

#else

int ph_GL_MakeCurrent(_THIS)

{

    PgSetRegion(PtWidgetRid(window));

    if (oglctx!=NULL)

    {

        if (qnxgl_set_current(oglctx) == -1)

        {

           return -1;

        }

    }

    return 0;

}

#endif /* 6.3.0 */

#if (_NTO_VERSION < 630)

/* This code is actual for the Photon3D Runtime which was available prior to 6.3 only */

int ph_SetupOpenGLContext(_THIS, int width, int height, int bpp, Uint32 flags)

{

    PhDim_t dim;

    uint64_t OGLAttrib[PH_OGL_MAX_ATTRIBS];

    int exposepost=0;

    int OGLargc;

    dim.w=width;

    dim.h=height;

    if ((oglctx!=NULL) && (oglflags==flags) && (oglbpp==bpp))

    {

       PdOpenGLContextResize(oglctx, &dim);

       PhDCSetCurrent(oglctx);

       return 0;

    }

    else

    {

       if (oglctx!=NULL)

       {

          PhDCSetCurrent(NULL);

          PhDCRelease(oglctx);

          oglctx=NULL;

          exposepost=1;

       }

    }

    OGLargc=0;

    if (this->gl_config.depth_size)

    {

        OGLAttrib[OGLargc++]=PHOGL_ATTRIB_DEPTH_BITS;

        OGLAttrib[OGLargc++]=this->gl_config.depth_size;

    }

    if (this->gl_config.stencil_size)

    {

        OGLAttrib[OGLargc++]=PHOGL_ATTRIB_STENCIL_BITS;

        OGLAttrib[OGLargc++]=this->gl_config.stencil_size;

    }

    OGLAttrib[OGLargc++]=PHOGL_ATTRIB_FORCE_SW;

    if (flags & SDL_FULLSCREEN)

    {

        OGLAttrib[OGLargc++]=PHOGL_ATTRIB_FULLSCREEN;

        OGLAttrib[OGLargc++]=PHOGL_ATTRIB_DIRECT;

        OGLAttrib[OGLargc++]=PHOGL_ATTRIB_FULLSCREEN_BEST;

        OGLAttrib[OGLargc++]=PHOGL_ATTRIB_FULLSCREEN_CENTER;

    }

    OGLAttrib[OGLargc++]=PHOGL_ATTRIB_NONE;

    if (this->gl_config.double_buffer)

    {

        oglctx=PdCreateOpenGLContext(2, &dim, 0, OGLAttrib);

    }

    else

    {

        oglctx=PdCreateOpenGLContext(1, &dim, 0, OGLAttrib);

    }

    if (oglctx==NULL)

    {

        SDL_SetError("ph_SetupOpenGLContext(): cannot create OpenGL context !\n");

        return -1;

    }

    PhDCSetCurrent(oglctx);

    PtFlush();

    oglflags=flags;

    oglbpp=bpp;

    if (exposepost!=0)

    {

        /* OpenGL context has been recreated, so report about this fact */

        SDL_PrivateExpose();

    }

    return 0;

}

#else /* _NTO_VERSION */

/* This code is actual for the built-in PhGL support, which became available since 6.3 */

int ph_SetupOpenGLContext(_THIS, int width, int height, int bpp, Uint32 flags)

{

    qnxgl_buf_attrib_t qnxgl_attribs[PH_OGL_MAX_ATTRIBS];

    qnxgl_buf_attrib_t* qnxgl_attribs_slide;

    int num_interfaces = 0;

    int num_buffers = 0;

    /* Initialize the OpenGL subsystem */

    num_interfaces = qnxgl_init(NULL, NULL, 0);

    if (num_interfaces < 0)

    {

        SDL_SetError("ph_SetupOpenGLContext(): cannot initialize OpenGL subsystem !\n");

        return -1;

    }

    if (num_interfaces == 0)

    {

        SDL_SetError("ph_SetupOpenGLContext(): there are no available OpenGL renderers was found !\n");

        return -1;

    }

    /* Driver is linked */

    this->gl_config.driver_loaded=1;

    /* Initialize the OpenGL context attributes */

    qnxgl_attribs_slide=qnxgl_attribs;

    /* Depth size */

    if (this->gl_config.depth_size)

    {

        fprintf(stderr, "setted depth size %d\n", this->gl_config.depth_size);

        qnxgl_attribs_slide = qnxgl_attrib_set_depth(qnxgl_attribs_slide, this->gl_config.depth_size);

    }

    /* Stencil size */

    if (this->gl_config.stencil_size)

    {

        qnxgl_attribs_slide = qnxgl_attrib_set_stencil(qnxgl_attribs_slide, this->gl_config.stencil_size);

    }

    /* The sum of the accum bits of each channel */

    if ((this->gl_config.accum_red_size != 0) && (this->gl_config.accum_blue_size != 0) &&

        (this->gl_config.accum_green_size != 0))

    {

        qnxgl_attribs_slide = qnxgl_attrib_set_accum(qnxgl_attribs_slide,

           this->gl_config.accum_red_size + this->gl_config.accum_blue_size +

           this->gl_config.accum_green_size + this->gl_config.accum_alpha_size);

    }

    /* Stereo mode */

    if (this->gl_config.stereo)

    {

        qnxgl_attribs_slide = qnxgl_attrib_set_stereo(qnxgl_attribs_slide);

    }

    /* Fullscreen mode */

    if ((flags & SDL_FULLSCREEN) == SDL_FULLSCREEN)

    {

        qnxgl_attribs_slide = qnxgl_attrib_set_hint_fullscreen(qnxgl_attribs_slide);

    }

    /* Double buffering mode */

    if (this->gl_config.double_buffer)

    {

        num_buffers=2;

    }

    else

    {

        num_buffers=1;

    }

    /* Loading the function pointers so we can use the extensions */

    GLPH_LOAD_FUNCS_GC(oglctx);

    /* Set the buffers region to be that of our window's region */

    qnxgl_attribs_slide = glph_attrib_set_region(qnxgl_attribs_slide, PtWidgetRid(window));

    /* End of the attributes array */

    qnxgl_attribs_slide = qnxgl_attrib_set_end(qnxgl_attribs_slide);

    /* Create the buffers with the specified color model */

    fprintf(stderr, "ARGB: %d, %d, %d, %d\n", this->gl_config.alpha_size, this->gl_config.red_size, this->gl_config.green_size, this->gl_config.blue_size);

    oglbuffers = qnxgl_buffers_create(

                   QNXGL_FORMAT_BEST_RGB,

/*                 __QNXGL_BUILD_FORMAT(0, __QNXGL_COLOR_MODEL_RGB, this->gl_config.alpha_size,

                     this->gl_config.red_size, this->gl_config.green_size, this->gl_config.blue_size), */

                 num_buffers, width, height, qnxgl_attribs, -1);

    if (oglbuffers == NULL)

    {

        SDL_SetError("ph_SetupOpenGLContext(): failed to create OpenGL buffers !\n");

        qnxgl_finish();

        return -1;

    }

    /* Create a QNXGL context for the previously created buffer */

    oglctx = qnxgl_context_create(oglbuffers, NULL);

    if (oglctx == NULL)

    {

        SDL_SetError("ph_SetupOpenGLContext(): failed to create OpenGL context !\n");

        qnxgl_buffers_destroy(oglbuffers);

        qnxgl_finish();

        return -1;

    }

    /* Attempt to make the context current so we can use OpenGL commands */

    if (qnxgl_set_current(oglctx) == -1)

    {

        SDL_SetError("ph_SetupOpenGLContext(): failed to make the OpenGL context current !\n");

        qnxgl_context_destroy(oglctx);

        qnxgl_buffers_destroy(oglbuffers);

        qnxgl_finish();

        return -1;

    }

    PtFlush();

    oglflags=flags;

    oglbpp=bpp;

    return 0;

}

#endif /* _NTO_VERSION */

#endif /* SDL_VIDEO_OPENGL */