/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 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 */
/* vi: set ts=4 sw=4 expandtab: */