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view src/video/x11/SDL_x11opengles.c @ 3473:7bdc10624cba

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This is terrible, but the OpenGL standard says that lines are half open, which means that one endpoint is not covered so adjoining lines don't overlap. It also doesn't define which end is open, and indeed Mac OS X and Linux differ. Mac OS X seems to leave the second endpoint open, but Linux uses the right-most endpoint for x major lines and the bottom-most endpoint for y major lines.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Nov 2009 07:14:21 +0000
parents d559edc85610
children f7b03b6838cb
line wrap: on
line source

/*
    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)
*/
#include "SDL_config.h"

#if SDL_VIDEO_OPENGL_ES

#include "SDL_x11video.h"
#include "SDL_x11opengles.h"

#define DEFAULT_OPENGL	"/usr/lib/libGLES_CM.so"

#define LOAD_FUNC(NAME) \
	*((void**)&_this->gles_data->NAME) = dlsym(handle, #NAME); \
	if (!_this->gles_data->NAME) \
	{ \
		SDL_SetError("Could not retrieve EGL function " #NAME); \
		return -1; \
	}

/* GLES implementation of SDL OpenGL support */

void *
X11_GLES_GetProcAddress(_THIS, const char *proc)
{
    static char procname[1024];
    void *handle;
    void *retval;

    handle = _this->gl_config.dll_handle;
    if (_this->gles_data->eglGetProcAddress) {
        retval = _this->gles_data->eglGetProcAddress(proc);
        if (retval) {
            return retval;
        }
    }
#if defined(__OpenBSD__) && !defined(__ELF__)
#undef dlsym(x,y);
#endif
    retval = dlsym(handle, proc);
    if (!retval && strlen(proc) <= 1022) {
        procname[0] = '_';
        strcpy(procname + 1, proc);
        retval = dlsym(handle, procname);
    }
    return retval;
}

void
X11_GLES_UnloadLibrary(_THIS)
{
    if (_this->gl_config.driver_loaded) {
        _this->gles_data->eglTerminate(_this->gles_data->egl_display);

        dlclose(_this->gl_config.dll_handle);

        _this->gles_data->eglGetProcAddress = NULL;
        _this->gles_data->eglChooseConfig = NULL;
        _this->gles_data->eglCreateContext = NULL;
        _this->gles_data->eglCreateWindowSurface = NULL;
        _this->gles_data->eglDestroyContext = NULL;
        _this->gles_data->eglDestroySurface = NULL;
        _this->gles_data->eglMakeCurrent = NULL;
        _this->gles_data->eglSwapBuffers = NULL;
        _this->gles_data->eglGetDisplay = NULL;
        _this->gles_data->eglTerminate = NULL;

        _this->gl_config.dll_handle = NULL;
        _this->gl_config.driver_loaded = 0;
    }
}

int
X11_GLES_LoadLibrary(_THIS, const char *path)
{
    void *handle;
    int dlopen_flags;

    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;

    if (_this->gles_data->egl_active) {
        SDL_SetError("OpenGL ES context already created");
        return -1;
    }
#ifdef RTLD_GLOBAL
    dlopen_flags = RTLD_LAZY | RTLD_GLOBAL;
#else
    dlopen_flags = RTLD_LAZY;
#endif
    handle = dlopen(path, dlopen_flags);
    /* Catch the case where the application isn't linked with EGL */
    if ((dlsym(handle, "eglChooseConfig") == NULL) && (path == NULL)) {

        dlclose(handle);
        path = getenv("SDL_VIDEO_GL_DRIVER");
        if (path == NULL) {
            path = DEFAULT_OPENGL;
        }
        handle = dlopen(path, dlopen_flags);
    }

    if (handle == NULL) {
        SDL_SetError("Could not load OpenGL ES/EGL library");
        return -1;
    }

    /* Unload the old driver and reset the pointers */
    X11_GLES_UnloadLibrary(_this);

    /* Load new function pointers */
    LOAD_FUNC(eglGetDisplay);
    LOAD_FUNC(eglInitialize);
    LOAD_FUNC(eglTerminate);
    LOAD_FUNC(eglGetProcAddress);
    LOAD_FUNC(eglChooseConfig);
    LOAD_FUNC(eglGetConfigAttrib);
    LOAD_FUNC(eglCreateContext);
    LOAD_FUNC(eglDestroyContext);
    LOAD_FUNC(eglCreateWindowSurface);
    LOAD_FUNC(eglDestroySurface);
    LOAD_FUNC(eglMakeCurrent);
    LOAD_FUNC(eglSwapBuffers);

    _this->gles_data->egl_display =
        _this->gles_data->eglGetDisplay((NativeDisplayType) data->display);

    if (!_this->gles_data->egl_display) {
        SDL_SetError("Could not get EGL display");
        return -1;
    }

    if (_this->gles_data->
        eglInitialize(_this->gles_data->egl_display, NULL,
                      NULL) != EGL_TRUE) {
        SDL_SetError("Could not initialize EGL");
        return -1;
    }

    _this->gl_config.dll_handle = handle;
    _this->gl_config.driver_loaded = 1;

    if (path) {
        strncpy(_this->gl_config.driver_path, path,
                sizeof(_this->gl_config.driver_path) - 1);
    } else {
        strcpy(_this->gl_config.driver_path, "");
    }
    return 0;
}

XVisualInfo *
X11_GLES_GetVisual(_THIS, Display * display, int screen)
{
    /* 64 seems nice. */
    EGLint attribs[64];
    EGLint found_configs = 0;
    VisualID visual_id;
    int i;

    /* load the gl driver from a default path */
    if (!_this->gl_config.driver_loaded) {
        /* no driver has been loaded, use default (ourselves) */
        if (X11_GLES_LoadLibrary(_this, NULL) < 0) {
            return NULL;
        }
    }

    i = 0;
    attribs[i++] = EGL_RED_SIZE;
    attribs[i++] = _this->gl_config.red_size;
    attribs[i++] = EGL_GREEN_SIZE;
    attribs[i++] = _this->gl_config.green_size;
    attribs[i++] = EGL_BLUE_SIZE;
    attribs[i++] = _this->gl_config.blue_size;

    if (_this->gl_config.alpha_size) {
        attribs[i++] = EGL_ALPHA_SIZE;
        attribs[i++] = _this->gl_config.alpha_size;
    }

    if (_this->gl_config.buffer_size) {
        attribs[i++] = EGL_BUFFER_SIZE;
        attribs[i++] = _this->gl_config.buffer_size;
    }

    attribs[i++] = EGL_DEPTH_SIZE;
    attribs[i++] = _this->gl_config.depth_size;

    if (_this->gl_config.stencil_size) {
        attribs[i++] = EGL_STENCIL_SIZE;
        attribs[i++] = _this->gl_config.stencil_size;
    }

    if (_this->gl_config.multisamplebuffers) {
        attribs[i++] = EGL_SAMPLE_BUFFERS;
        attribs[i++] = _this->gl_config.multisamplebuffers;
    }

    if (_this->gl_config.multisamplesamples) {
        attribs[i++] = EGL_SAMPLES;
        attribs[i++] = _this->gl_config.multisamplesamples;
    }

    attribs[i++] = EGL_NONE;

    if (_this->gles_data->eglChooseConfig(_this->gles_data->egl_display,
                                          attribs,
                                          &_this->gles_data->egl_config, 1,
                                          &found_configs) == EGL_FALSE ||
        found_configs == 0) {
        SDL_SetError("Couldn't find matching EGL config");
        return NULL;
    }

    if (_this->gles_data->eglGetConfigAttrib(_this->gles_data->egl_display,
                                             _this->gles_data->egl_config,
                                             EGL_NATIVE_VISUAL_ID,
                                             (EGLint *) & visual_id) ==
        EGL_FALSE || !visual_id) {
        /* Use the default visual when all else fails */
        XVisualInfo vi_in;
        int out_count;
        vi_in.screen = screen;

        _this->gles_data->egl_visualinfo = XGetVisualInfo(display,
                                                          VisualScreenMask,
                                                          &vi_in, &out_count);
    } else {
        XVisualInfo vi_in;
        int out_count;

        vi_in.screen = screen;
        vi_in.visualid = visual_id;
        _this->gles_data->egl_visualinfo = XGetVisualInfo(display,
                                                          VisualScreenMask |
                                                          VisualIDMask,
                                                          &vi_in, &out_count);
    }

    return _this->gles_data->egl_visualinfo;
}

SDL_GLContext
X11_GLES_CreateContext(_THIS, SDL_Window * window)
{
    int retval;
    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    Display *display = data->videodata->display;

    XSync(display, False);


    _this->gles_data->egl_context =
        _this->gles_data->eglCreateContext(_this->gles_data->egl_display,
                                           _this->gles_data->egl_config,
                                           EGL_NO_CONTEXT, NULL);
    XSync(display, False);

    if (_this->gles_data->egl_context == EGL_NO_CONTEXT) {
        SDL_SetError("Could not create EGL context");
        return NULL;
    }

    _this->gles_data->egl_active = 1;

    if (_this->gles_data->egl_active)
        retval = 1;
    else
        retval = 0;

    return (retval);
}

int
X11_GLES_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
{
    int retval;

//    SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
//    Display *display = data->videodata->display;

    retval = 1;
    if (!_this->gles_data->eglMakeCurrent(_this->gles_data->egl_display,
                                          _this->gles_data->egl_surface,
                                          _this->gles_data->egl_surface,
                                          _this->gles_data->egl_context)) {
        SDL_SetError("Unable to make EGL context current");
        retval = -1;
    }
//    XSync(display, False);

    return (retval);
}

static int swapinterval = -1;
int
X11_GLES_SetSwapInterval(_THIS, int interval)
{
    return 0;
}

int
X11_GLES_GetSwapInterval(_THIS)
{
    return 0;
}

void
X11_GLES_SwapWindow(_THIS, SDL_Window * window)
{
    _this->gles_data->eglSwapBuffers(_this->gles_data->egl_display,
                                     _this->gles_data->egl_surface);
}

void
X11_GLES_DeleteContext(_THIS, SDL_GLContext context)
{
    /* Clean up GLES and EGL */
    if (_this->gles_data->egl_context != EGL_NO_CONTEXT ||
        _this->gles_data->egl_surface != EGL_NO_SURFACE) {
        _this->gles_data->eglMakeCurrent(_this->gles_data->egl_display,
                                         EGL_NO_SURFACE, EGL_NO_SURFACE,
                                         EGL_NO_CONTEXT);

        if (_this->gles_data->egl_context != EGL_NO_CONTEXT) {
            _this->gles_data->eglDestroyContext(_this->gles_data->egl_display,
                                                _this->gles_data->
                                                egl_context);
            _this->gles_data->egl_context = EGL_NO_CONTEXT;
        }

        if (_this->gles_data->egl_surface != EGL_NO_SURFACE) {
            _this->gles_data->eglDestroySurface(_this->gles_data->egl_display,
                                                _this->gles_data->
                                                egl_surface);
            _this->gles_data->egl_surface = EGL_NO_SURFACE;
        }
    }
    _this->gles_data->egl_active = 0;

/* crappy fix */
    X11_GLES_UnloadLibrary(_this);

}

#endif /* SDL_VIDEO_OPENGL_ES */

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