src/video/pandora/SDL_pandora.c

/*
    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

    Open Pandora SDL driver
    Copyright (C) 2009 David Carré
    (cpasjuste@gmail.com)
*/

/* SDL internals */
#include "SDL_config.h"
#include "../SDL_sysvideo.h"
#include "SDL_version.h"
#include "SDL_syswm.h"
#include "SDL_loadso.h"
#include "SDL_events.h"
#include "../../events/SDL_mouse_c.h"
#include "../../events/SDL_keyboard_c.h"

/* PND declarations */
#include "SDL_pandora.h"
#include "SDL_pandora_events.h"

static SDL_bool PND_initialized = SDL_FALSE;

static int
PND_available(void)
{
    return 1;
}

static void
PND_destroy(SDL_VideoDevice * device)
{
    SDL_VideoData *phdata = (SDL_VideoData *) device->driverdata;

    if (device->driverdata != NULL) {
        device->driverdata = NULL;
    }
}

static SDL_VideoDevice *
PND_create()
{
    SDL_VideoDevice *device;
    SDL_VideoData *phdata;
    int status;

    /* Check if pandora could be initialized */
    status = PND_available();
    if (status == 0) {
        /* PND could not be used */
        return NULL;
    }

    /* Initialize SDL_VideoDevice structure */
    device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
    if (device == NULL) {
        SDL_OutOfMemory();
        return NULL;
    }

    /* Initialize internal Pandora specific data */
    phdata = (SDL_VideoData *) SDL_calloc(1, sizeof(SDL_VideoData));
    if (phdata == NULL) {
        SDL_OutOfMemory();
        SDL_free(device);
        return NULL;
    }

    device->driverdata = phdata;

    phdata->egl_initialized = SDL_TRUE;


    /* Setup amount of available displays and current display */
    device->num_displays = 1;
    device->current_display = 1;

    /* Set device free function */
    device->free = PND_destroy;

    /* Setup all functions which we can handle */
    device->VideoInit = PND_videoinit;
    device->VideoQuit = PND_videoquit;
    device->GetDisplayModes = PND_getdisplaymodes;
    device->SetDisplayMode = PND_setdisplaymode;
    device->SetDisplayPalette = PND_setdisplaypalette;
    device->GetDisplayPalette = PND_getdisplaypalette;
    device->SetDisplayGammaRamp = PND_setdisplaygammaramp;
    device->GetDisplayGammaRamp = PND_getdisplaygammaramp;
    device->CreateWindow = PND_createwindow;
    device->CreateWindowFrom = PND_createwindowfrom;
    device->SetWindowTitle = PND_setwindowtitle;
    device->SetWindowIcon = PND_setwindowicon;
    device->SetWindowPosition = PND_setwindowposition;
    device->SetWindowSize = PND_setwindowsize;
    device->ShowWindow = PND_showwindow;
    device->HideWindow = PND_hidewindow;
    device->RaiseWindow = PND_raisewindow;
    device->MaximizeWindow = PND_maximizewindow;
    device->MinimizeWindow = PND_minimizewindow;
    device->RestoreWindow = PND_restorewindow;
    device->SetWindowGrab = PND_setwindowgrab;
    device->DestroyWindow = PND_destroywindow;
    device->GetWindowWMInfo = PND_getwindowwminfo;
    device->GL_LoadLibrary = PND_gl_loadlibrary;
    device->GL_GetProcAddress = PND_gl_getprocaddres;
    device->GL_UnloadLibrary = PND_gl_unloadlibrary;
    device->GL_CreateContext = PND_gl_createcontext;
    device->GL_MakeCurrent = PND_gl_makecurrent;
    device->GL_SetSwapInterval = PND_gl_setswapinterval;
    device->GL_GetSwapInterval = PND_gl_getswapinterval;
    device->GL_SwapWindow = PND_gl_swapwindow;
    device->GL_DeleteContext = PND_gl_deletecontext;
    device->PumpEvents = PND_PumpEvents;

    return device;
}

VideoBootStrap PND_bootstrap = {
    "pandora",
    "SDL Pandora Video Driver",
    PND_available,
    PND_create
};

/*****************************************************************************/
/* SDL Video and Display initialization/handling functions                   */
/*****************************************************************************/
int
PND_videoinit(_THIS)
{
    SDL_VideoDisplay display;
    SDL_DisplayMode current_mode;

    SDL_zero(current_mode);
    current_mode.w = 800;
    current_mode.h = 480;
    current_mode.refresh_rate = 60;
    current_mode.format = SDL_PIXELFORMAT_RGB565;
    current_mode.driverdata = NULL;

    SDL_zero(display);
    display.desktop_mode = current_mode;
    display.current_mode = current_mode;
    display.driverdata = NULL;

    SDL_AddVideoDisplay(&display);

    return 1;
}

void
PND_videoquit(_THIS)
{

}

void
PND_getdisplaymodes(_THIS)
{

}

int
PND_setdisplaymode(_THIS, SDL_DisplayMode * mode)
{
    return 0;
}

int
PND_setdisplaypalette(_THIS, SDL_Palette * palette)
{
    SDL_DisplayData *didata =
        (SDL_DisplayData *) SDL_CurrentDisplay.driverdata;

    /* Setting display palette operation has been failed */
    return -1;
}

int
PND_getdisplaypalette(_THIS, SDL_Palette * palette)
{
    SDL_DisplayData *didata =
        (SDL_DisplayData *) SDL_CurrentDisplay.driverdata;

    /* Getting display palette operation has been failed */
    return -1;
}

int
PND_setdisplaygammaramp(_THIS, Uint16 * ramp)
{
    SDL_DisplayData *didata =
        (SDL_DisplayData *) SDL_CurrentDisplay.driverdata;

    /* Setting display gamma ramp operation has been failed */
    return -1;
}

int
PND_getdisplaygammaramp(_THIS, Uint16 * ramp)
{
    /* Getting display gamma ramp operation has been failed */
    return -1;
}

int
PND_createwindow(_THIS, SDL_Window * window)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;

    SDL_WindowData *wdata;

    uint32_t winargc = 0;
    int32_t status;


    /* Allocate window internal data */
    wdata = (SDL_WindowData *) SDL_calloc(1, sizeof(SDL_WindowData));
    if (wdata == NULL) {
        SDL_OutOfMemory();
        return -1;
    }

    /* Setup driver data for this window */
    window->driverdata = wdata;

    /* Check if window must support OpenGL ES rendering */
    if ((window->flags & SDL_WINDOW_OPENGL) == SDL_WINDOW_OPENGL) {

        EGLBoolean initstatus;

        /* Mark this window as OpenGL ES compatible */
        wdata->uses_gles = SDL_TRUE;

        /* Create connection to OpenGL ES */
        if (phdata->egl_display == EGL_NO_DISPLAY) {
            phdata->egl_display = eglGetDisplay((NativeDisplayType) 0);
            if (phdata->egl_display == EGL_NO_DISPLAY) {
                SDL_SetError("PND: Can't get connection to OpenGL ES");
                return -1;
            }

            initstatus = eglInitialize(phdata->egl_display, NULL, NULL);
            if (initstatus != EGL_TRUE) {
                SDL_SetError("PND: Can't init OpenGL ES library");
                return -1;
            }
        }

        phdata->egl_refcount++;
    }

    /* Window has been successfully created */
    return 0;
}

int
PND_createwindowfrom(_THIS, SDL_Window * window, const void *data)
{
    return -1;
}

void
PND_setwindowtitle(_THIS, SDL_Window * window)
{
}
void
PND_setwindowicon(_THIS, SDL_Window * window, SDL_Surface * icon)
{
}
void
PND_setwindowposition(_THIS, SDL_Window * window)
{
}
void
PND_setwindowsize(_THIS, SDL_Window * window)
{
}
void
PND_showwindow(_THIS, SDL_Window * window)
{
}
void
PND_hidewindow(_THIS, SDL_Window * window)
{
}
void
PND_raisewindow(_THIS, SDL_Window * window)
{
}
void
PND_maximizewindow(_THIS, SDL_Window * window)
{
}
void
PND_minimizewindow(_THIS, SDL_Window * window)
{
}
void
PND_restorewindow(_THIS, SDL_Window * window)
{
}
void
PND_setwindowgrab(_THIS, SDL_Window * window)
{
}
void
PND_destroywindow(_THIS, SDL_Window * window)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;
    eglTerminate(phdata->egl_display);
}

/*****************************************************************************/
/* SDL Window Manager function                                               */
/*****************************************************************************/
SDL_bool
PND_getwindowwminfo(_THIS, SDL_Window * window, struct SDL_SysWMinfo *info)
{
    if (info->version.major <= SDL_MAJOR_VERSION) {
        return SDL_TRUE;
    } else {
        SDL_SetError("application not compiled with SDL %d.%d\n",
                     SDL_MAJOR_VERSION, SDL_MINOR_VERSION);
        return SDL_FALSE;
    }

    /* Failed to get window manager information */
    return SDL_FALSE;
}

/*****************************************************************************/
/* SDL OpenGL/OpenGL ES functions                                            */
/*****************************************************************************/
int
PND_gl_loadlibrary(_THIS, const char *path)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;

    /* Check if OpenGL ES library is specified for GF driver */
    if (path == NULL) {
        path = SDL_getenv("SDL_OPENGL_LIBRARY");
        if (path == NULL) {
            path = SDL_getenv("SDL_OPENGLES_LIBRARY");
        }
    }

    /* Check if default library loading requested */
    if (path == NULL) {
        /* Already linked with GF library which provides egl* subset of  */
        /* functions, use Common profile of OpenGL ES library by default */
        path = "/usr/lib/libGLES_CM.so";
    }

    /* Load dynamic library */
    _this->gl_config.dll_handle = SDL_LoadObject(path);
    if (!_this->gl_config.dll_handle) {
        /* Failed to load new GL ES library */
        SDL_SetError("PND: Failed to locate OpenGL ES library");
        return -1;
    }

    /* Store OpenGL ES library path and name */
    SDL_strlcpy(_this->gl_config.driver_path, path,
                SDL_arraysize(_this->gl_config.driver_path));

    /* New OpenGL ES library is loaded */
    return 0;
}

void *
PND_gl_getprocaddres(_THIS, const char *proc)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;
    void *function_address;

    /* Try to get function address through the egl interface */
    function_address = eglGetProcAddress(proc);
    if (function_address != NULL) {
        return function_address;
    }

    /* Then try to get function in the OpenGL ES library */
    if (_this->gl_config.dll_handle) {
        function_address =
            SDL_LoadFunction(_this->gl_config.dll_handle, proc);
        if (function_address != NULL) {
            return function_address;
        }
    }

    /* Failed to get GL ES function address pointer */
    SDL_SetError("PND: Cannot locate OpenGL ES function name");
    return NULL;
}

void
PND_gl_unloadlibrary(_THIS)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;

    if (phdata->egl_initialized == SDL_TRUE) {
        /* Unload OpenGL ES library */
        if (_this->gl_config.dll_handle) {
            SDL_UnloadObject(_this->gl_config.dll_handle);
            _this->gl_config.dll_handle = NULL;
        }
    } else {
        SDL_SetError("PND: GF initialization failed, no OpenGL ES support");
    }
}

SDL_GLContext
PND_gl_createcontext(_THIS, SDL_Window * window)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;
    SDL_WindowData *wdata = (SDL_WindowData *) window->driverdata;
    SDL_DisplayData *didata =
        (SDL_DisplayData *) SDL_CurrentDisplay.driverdata;
    EGLBoolean status;
    int32_t gfstatus;
    EGLint configs;
    uint32_t attr_pos;
    EGLint attr_value;
    EGLint cit;

    /* Check if EGL was initialized */
    if (phdata->egl_initialized != SDL_TRUE) {
        SDL_SetError("PND: EGL initialization failed, no OpenGL ES support");
        return NULL;
    }

    /* Prepare attributes list to pass them to OpenGL ES */
    attr_pos = 0;
    wdata->gles_attributes[attr_pos++] = EGL_SURFACE_TYPE;
    wdata->gles_attributes[attr_pos++] = EGL_WINDOW_BIT;
    wdata->gles_attributes[attr_pos++] = EGL_RED_SIZE;
    wdata->gles_attributes[attr_pos++] = _this->gl_config.red_size;
    wdata->gles_attributes[attr_pos++] = EGL_GREEN_SIZE;
    wdata->gles_attributes[attr_pos++] = _this->gl_config.green_size;
    wdata->gles_attributes[attr_pos++] = EGL_BLUE_SIZE;
    wdata->gles_attributes[attr_pos++] = _this->gl_config.blue_size;
    wdata->gles_attributes[attr_pos++] = EGL_ALPHA_SIZE;

    /* Setup alpha size in bits */
    if (_this->gl_config.alpha_size) {
        wdata->gles_attributes[attr_pos++] = _this->gl_config.alpha_size;
    } else {
        wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
    }

    /* Setup color buffer size */
    if (_this->gl_config.buffer_size) {
        wdata->gles_attributes[attr_pos++] = EGL_BUFFER_SIZE;
        wdata->gles_attributes[attr_pos++] = _this->gl_config.buffer_size;
    } else {
        wdata->gles_attributes[attr_pos++] = EGL_BUFFER_SIZE;
        wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
    }

    /* Setup depth buffer bits */
    wdata->gles_attributes[attr_pos++] = EGL_DEPTH_SIZE;
    wdata->gles_attributes[attr_pos++] = _this->gl_config.depth_size;

    /* Setup stencil bits */
    if (_this->gl_config.stencil_size) {
        wdata->gles_attributes[attr_pos++] = EGL_STENCIL_SIZE;
        wdata->gles_attributes[attr_pos++] = _this->gl_config.buffer_size;
    } else {
        wdata->gles_attributes[attr_pos++] = EGL_STENCIL_SIZE;
        wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
    }

    /* Set number of samples in multisampling */
    if (_this->gl_config.multisamplesamples) {
        wdata->gles_attributes[attr_pos++] = EGL_SAMPLES;
        wdata->gles_attributes[attr_pos++] =
            _this->gl_config.multisamplesamples;
    }

    /* Multisample buffers, OpenGL ES 1.0 spec defines 0 or 1 buffer */
    if (_this->gl_config.multisamplebuffers) {
        wdata->gles_attributes[attr_pos++] = EGL_SAMPLE_BUFFERS;
        wdata->gles_attributes[attr_pos++] =
            _this->gl_config.multisamplebuffers;
    }

    /* Finish attributes list */
    wdata->gles_attributes[attr_pos] = EGL_NONE;

    /* Request first suitable framebuffer configuration */
    status = eglChooseConfig(phdata->egl_display, wdata->gles_attributes,
                             wdata->gles_configs, 1, &configs);
    if (status != EGL_TRUE) {
        SDL_SetError("PND: Can't find closest configuration for OpenGL ES");
        return NULL;
    }

    /* Check if nothing has been found, try "don't care" settings */
    if (configs == 0) {
        int32_t it;
        int32_t jt;
        GLint depthbits[4] = { 32, 24, 16, EGL_DONT_CARE };

        for (it = 0; it < 4; it++) {
            for (jt = 16; jt >= 0; jt--) {
                /* Don't care about color buffer bits, use what exist */
                /* Replace previous set data with EGL_DONT_CARE       */
                attr_pos = 0;
                wdata->gles_attributes[attr_pos++] = EGL_SURFACE_TYPE;
                wdata->gles_attributes[attr_pos++] = EGL_WINDOW_BIT;
                wdata->gles_attributes[attr_pos++] = EGL_RED_SIZE;
                wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
                wdata->gles_attributes[attr_pos++] = EGL_GREEN_SIZE;
                wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
                wdata->gles_attributes[attr_pos++] = EGL_BLUE_SIZE;
                wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
                wdata->gles_attributes[attr_pos++] = EGL_ALPHA_SIZE;
                wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
                wdata->gles_attributes[attr_pos++] = EGL_BUFFER_SIZE;
                wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;

                /* Try to find requested or smallest depth */
                if (_this->gl_config.depth_size) {
                    wdata->gles_attributes[attr_pos++] = EGL_DEPTH_SIZE;
                    wdata->gles_attributes[attr_pos++] = depthbits[it];
                } else {
                    wdata->gles_attributes[attr_pos++] = EGL_DEPTH_SIZE;
                    wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
                }

                if (_this->gl_config.stencil_size) {
                    wdata->gles_attributes[attr_pos++] = EGL_STENCIL_SIZE;
                    wdata->gles_attributes[attr_pos++] = jt;
                } else {
                    wdata->gles_attributes[attr_pos++] = EGL_STENCIL_SIZE;
                    wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
                }

                wdata->gles_attributes[attr_pos++] = EGL_SAMPLES;
                wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
                wdata->gles_attributes[attr_pos++] = EGL_SAMPLE_BUFFERS;
                wdata->gles_attributes[attr_pos++] = EGL_DONT_CARE;
                wdata->gles_attributes[attr_pos] = EGL_NONE;

                /* Request first suitable framebuffer configuration */
                status =
                    eglChooseConfig(phdata->egl_display,
                                    wdata->gles_attributes,
                                    wdata->gles_configs, 1, &configs);

                if (status != EGL_TRUE) {
                    SDL_SetError
                        ("PND: Can't find closest configuration for OpenGL ES");
                    return NULL;
                }
                if (configs != 0) {
                    break;
                }
            }
            if (configs != 0) {
                break;
            }
        }

        /* No available configs */
        if (configs == 0) {
            SDL_SetError("PND: Can't find any configuration for OpenGL ES");
            return NULL;
        }
    }

    /* Initialize config index */
    wdata->gles_config = 0;

    /* Now check each configuration to find out the best */
    for (cit = 0; cit < configs; cit++) {
        uint32_t stencil_found;
        uint32_t depth_found;

        stencil_found = 0;
        depth_found = 0;

        if (_this->gl_config.stencil_size) {
            status =
                eglGetConfigAttrib(phdata->egl_display,
                                   wdata->gles_configs[cit], EGL_STENCIL_SIZE,
                                   &attr_value);
            if (status == EGL_TRUE) {
                if (attr_value != 0) {
                    stencil_found = 1;
                }
            }
        } else {
            stencil_found = 1;
        }

        if (_this->gl_config.depth_size) {
            status =
                eglGetConfigAttrib(phdata->egl_display,
                                   wdata->gles_configs[cit], EGL_DEPTH_SIZE,
                                   &attr_value);
            if (status == EGL_TRUE) {
                if (attr_value != 0) {
                    depth_found = 1;
                }
            }
        } else {
            depth_found = 1;
        }

        /* Exit from loop if found appropriate configuration */
        if ((depth_found != 0) && (stencil_found != 0)) {
            break;
        }
    }

    /* If best could not be found, use first */
    if (cit == configs) {
        cit = 0;
    }
    wdata->gles_config = cit;

    /* Create OpenGL ES context */
    wdata->gles_context =
        eglCreateContext(phdata->egl_display,
                         wdata->gles_configs[wdata->gles_config], NULL, NULL);
    if (wdata->gles_context == EGL_NO_CONTEXT) {
        SDL_SetError("PND: OpenGL ES context creation has been failed");
        return NULL;
    }

    wdata->gles_surface =
        eglCreateWindowSurface(phdata->egl_display,
                               wdata->gles_configs[wdata->gles_config],
                               (NativeWindowType) 0, NULL);
    if (wdata->gles_surface == 0) {
        SDL_SetError("Error : eglCreateWindowSurface failed;\n");
        return NULL;
    }

    /* Make just created context current */
    status =
        eglMakeCurrent(phdata->egl_display, wdata->gles_surface,
                       wdata->gles_surface, wdata->gles_context);
    if (status != EGL_TRUE) {
        /* Destroy OpenGL ES surface */
        eglDestroySurface(phdata->egl_display, wdata->gles_surface);
        eglDestroyContext(phdata->egl_display, wdata->gles_context);
        wdata->gles_context = EGL_NO_CONTEXT;
        SDL_SetError("PND: Can't set OpenGL ES context on creation");
        return NULL;
    }

    _this->gl_config.accelerated = 1;

    /* Always clear stereo enable, since OpenGL ES do not supports stereo */
    _this->gl_config.stereo = 0;

    /* Get back samples and samplebuffers configurations. Rest framebuffer */
    /* parameters could be obtained through the OpenGL ES API              */
    status =
        eglGetConfigAttrib(phdata->egl_display,
                           wdata->gles_configs[wdata->gles_config],
                           EGL_SAMPLES, &attr_value);
    if (status == EGL_TRUE) {
        _this->gl_config.multisamplesamples = attr_value;
    }
    status =
        eglGetConfigAttrib(phdata->egl_display,
                           wdata->gles_configs[wdata->gles_config],
                           EGL_SAMPLE_BUFFERS, &attr_value);
    if (status == EGL_TRUE) {
        _this->gl_config.multisamplebuffers = attr_value;
    }

    /* Get back stencil and depth buffer sizes */
    status =
        eglGetConfigAttrib(phdata->egl_display,
                           wdata->gles_configs[wdata->gles_config],
                           EGL_DEPTH_SIZE, &attr_value);
    if (status == EGL_TRUE) {
        _this->gl_config.depth_size = attr_value;
    }
    status =
        eglGetConfigAttrib(phdata->egl_display,
                           wdata->gles_configs[wdata->gles_config],
                           EGL_STENCIL_SIZE, &attr_value);
    if (status == EGL_TRUE) {
        _this->gl_config.stencil_size = attr_value;
    }

    /* Under PND OpenGL ES output can't be double buffered */
    _this->gl_config.double_buffer = 0;

    /* GL ES context was successfully created */
    return wdata->gles_context;
}

int
PND_gl_makecurrent(_THIS, SDL_Window * window, SDL_GLContext context)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;
    SDL_WindowData *wdata;
    EGLBoolean status;

    if (phdata->egl_initialized != SDL_TRUE) {
        SDL_SetError("PND: GF initialization failed, no OpenGL ES support");
        return -1;
    }

    if ((window == NULL) && (context == NULL)) {
        status =
            eglMakeCurrent(phdata->egl_display, EGL_NO_SURFACE,
                           EGL_NO_SURFACE, EGL_NO_CONTEXT);
        if (status != EGL_TRUE) {
            /* Failed to set current GL ES context */
            SDL_SetError("PND: Can't set OpenGL ES context");
            return -1;
        }
    } else {
        wdata = (SDL_WindowData *) window->driverdata;
        if (wdata->gles_surface == EGL_NO_SURFACE) {
            SDL_SetError
                ("PND: OpenGL ES surface is not initialized for this window");
            return -1;
        }
        if (wdata->gles_context == EGL_NO_CONTEXT) {
            SDL_SetError
                ("PND: OpenGL ES context is not initialized for this window");
            return -1;
        }
        if (wdata->gles_context != context) {
            SDL_SetError
                ("PND: OpenGL ES context is not belong to this window");
            return -1;
        }
        status =
            eglMakeCurrent(phdata->egl_display, wdata->gles_surface,
                           wdata->gles_surface, wdata->gles_context);
        if (status != EGL_TRUE) {
            /* Failed to set current GL ES context */
            SDL_SetError("PND: Can't set OpenGL ES context");
            return -1;
        }
    }
    return 0;
}

int
PND_gl_setswapinterval(_THIS, int interval)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;
    EGLBoolean status;

    if (phdata->egl_initialized != SDL_TRUE) {
        SDL_SetError("PND: EGL initialization failed, no OpenGL ES support");
        return -1;
    }

    /* Check if OpenGL ES connection has been initialized */
    if (phdata->egl_display != EGL_NO_DISPLAY) {
        /* Set swap OpenGL ES interval */
        status = eglSwapInterval(phdata->egl_display, interval);
        if (status == EGL_TRUE) {
            /* Return success to upper level */
            phdata->swapinterval = interval;
            return 0;
        }
    }

    /* Failed to set swap interval */
    SDL_SetError("PND: Cannot set swap interval");
    return -1;
}

int
PND_gl_getswapinterval(_THIS)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;

    if (phdata->egl_initialized != SDL_TRUE) {
        SDL_SetError("PND: GLES initialization failed, no OpenGL ES support");
        return -1;
    }

    /* Return default swap interval value */
    return phdata->swapinterval;
}

void
PND_gl_swapwindow(_THIS, SDL_Window * window)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;
    SDL_WindowData *wdata = (SDL_WindowData *) window->driverdata;
    SDL_DisplayData *didata =
        (SDL_DisplayData *) SDL_CurrentDisplay.driverdata;


    if (phdata->egl_initialized != SDL_TRUE) {
        SDL_SetError("PND: GLES initialization failed, no OpenGL ES support");
        return;
    }

    /* Many applications do not uses glFinish(), so we call it for them */
    glFinish();

    /* Wait until OpenGL ES rendering is completed */
    eglWaitGL();

    eglSwapBuffers(phdata->egl_display, wdata->gles_surface);
}

void
PND_gl_deletecontext(_THIS, SDL_GLContext context)
{
    SDL_VideoData *phdata = (SDL_VideoData *) _this->driverdata;
    EGLBoolean status;

    if (phdata->egl_initialized != SDL_TRUE) {
        SDL_SetError("PND: GLES initialization failed, no OpenGL ES support");
        return;
    }

    /* Check if OpenGL ES connection has been initialized */
    if (phdata->egl_display != EGL_NO_DISPLAY) {
        if (context != EGL_NO_CONTEXT) {
            status = eglDestroyContext(phdata->egl_display, context);
            if (status != EGL_TRUE) {
                /* Error during OpenGL ES context destroying */
                SDL_SetError("PND: OpenGL ES context destroy error");
                return;
            }
        }
    }

    return;
}

/* vi: set ts=4 sw=4 expandtab: */