Add libva to chromium third_party.

third_party/libva/va/glx/va_glx_impl.c

Index: third_party/libva/va/glx/va_glx_impl.c
diff --git a/third_party/libva/va/glx/va_glx_impl.c b/third_party/libva/va/glx/va_glx_impl.c
new file mode 100644
index 0000000000000000000000000000000000000000..049be09c1c8b6e43f390ebf81c6c19ac75dece62
--- /dev/null
+++ b/third_party/libva/va/glx/va_glx_impl.c
@@ -0,0 +1,1083 @@
+/*
+ * Copyright (C) 2009 Splitted-Desktop Systems. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#define _GNU_SOURCE 1
+#include "va_glx_private.h"
+#include "va_glx_impl.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <assert.h>
+#include <dlfcn.h>
+
+static void va_glx_error_message(const char *format, ...)
+{
+    va_list args;
+    va_start(args, format);
+    fprintf(stderr, "libva-glx error: ");
+    vfprintf(stderr, format, args);
+    va_end(args);
+}
+
+// X error trap
+static int x11_error_code = 0;
+static int (*old_error_handler)(Display *, XErrorEvent *);
+
+static int error_handler(Display *dpy, XErrorEvent *error)
+{
+    x11_error_code = error->error_code;
+    return 0;
+}
+
+static void x11_trap_errors(void)
+{
+    x11_error_code    = 0;
+    old_error_handler = XSetErrorHandler(error_handler);
+}
+
+static int x11_untrap_errors(void)
+{
+    XSetErrorHandler(old_error_handler);
+    return x11_error_code;
+}
+
+// Returns a string representation of an OpenGL error
+static const char *gl_get_error_string(GLenum error)
+{
+    static const struct {
+        GLenum val;
+        const char *str;
+    }
+    gl_errors[] = {
+        { GL_NO_ERROR,          "no error" },
+        { GL_INVALID_ENUM,      "invalid enumerant" },
+        { GL_INVALID_VALUE,     "invalid value" },
+        { GL_INVALID_OPERATION, "invalid operation" },
+        { GL_STACK_OVERFLOW,    "stack overflow" },
+        { GL_STACK_UNDERFLOW,   "stack underflow" },
+        { GL_OUT_OF_MEMORY,     "out of memory" },
+#ifdef GL_INVALID_FRAMEBUFFER_OPERATION_EXT
+        { GL_INVALID_FRAMEBUFFER_OPERATION_EXT, "invalid framebuffer operation" },
+#endif
+        { ~0, NULL }
+    };
+
+    int i;
+    for (i = 0; gl_errors[i].str; i++) {
+        if (gl_errors[i].val == error)
+            return gl_errors[i].str;
+    }
+    return "unknown";
+}
+
+static inline int gl_do_check_error(int report)
+{
+    GLenum error;
+    int is_error = 0;
+    while ((error = glGetError()) != GL_NO_ERROR) {
+        if (report)
+            va_glx_error_message("glError: %s caught\n",
+                                 gl_get_error_string(error));
+        is_error = 1;
+    }
+    return is_error;
+}
+
+static inline void gl_purge_errors(void)
+{
+    gl_do_check_error(0);
+}
+
+static inline int gl_check_error(void)
+{
+    return gl_do_check_error(1);
+}
+
+// glGetTexLevelParameteriv() wrapper
+static int gl_get_texture_param(GLenum param, unsigned int *pval)
+{
+    GLint val;
+
+    gl_purge_errors();
+    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, param, &val);
+    if (gl_check_error())
+        return 0;
+    if (pval)
+        *pval = val;
+    return 1;
+}
+
+// Returns the OpenGL VTable
+static inline VAOpenGLVTableP gl_get_vtable(VADriverContextP ctx)
+{
+    return &VA_DRIVER_CONTEXT_GLX(ctx)->gl_vtable;
+}
+
+// Lookup for a GLX function
+typedef void (*GLFuncPtr)(void);
+typedef GLFuncPtr (*GLXGetProcAddressProc)(const char *);
+
+static GLFuncPtr get_proc_address_default(const char *name)
+{
+    return NULL;
+}
+
+static GLXGetProcAddressProc get_proc_address_func(void)
+{
+    GLXGetProcAddressProc get_proc_func;
+
+    dlerror();
+    get_proc_func = (GLXGetProcAddressProc)
+        dlsym(RTLD_DEFAULT, "glXGetProcAddress");
+    if (!dlerror())
+        return get_proc_func;
+
+    get_proc_func = (GLXGetProcAddressProc)
+        dlsym(RTLD_DEFAULT, "glXGetProcAddressARB");
+    if (!dlerror())
+        return get_proc_func;
+
+    return get_proc_address_default;
+}
+
+static inline GLFuncPtr get_proc_address(const char *name)
+{
+    static GLXGetProcAddressProc get_proc_func = NULL;
+    if (!get_proc_func)
+        get_proc_func = get_proc_address_func();
+    return get_proc_func(name);
+}
+
+// Check for GLX extensions (TFP, FBO)
+static int check_extension(const char *name, const char *ext)
+{
+    const char *end;
+    int name_len, n;
+
+    if (!name || !ext)
+        return 0;
+
+    end = ext + strlen(ext);
+    name_len = strlen(name);
+    while (ext < end) {
+        n = strcspn(ext, " ");
+        if (n == name_len && strncmp(name, ext, n) == 0)
+            return 1;
+        ext += (n + 1);
+    }
+    return 0;
+}
+
+static int check_tfp_extensions(VADriverContextP ctx)
+{
+    const char *gl_extensions;
+    const char *glx_extensions;
+
+    gl_extensions = (const char *)glGetString(GL_EXTENSIONS);
+    if (!check_extension("GL_ARB_texture_non_power_of_two", gl_extensions))
+        return 0;
+
+    glx_extensions = glXQueryExtensionsString(ctx->native_dpy, ctx->x11_screen);
+    if (!check_extension("GLX_EXT_texture_from_pixmap", glx_extensions))
+        return 0;
+    return 1;
+}
+
+static int check_fbo_extensions(VADriverContextP ctx)
+{
+    const char *gl_extensions;
+
+    gl_extensions = (const char *)glGetString(GL_EXTENSIONS);
+    if (check_extension("GL_ARB_framebuffer_object", gl_extensions))
+        return 1;
+    if (check_extension("GL_EXT_framebuffer_object", gl_extensions))
+        return 1;
+    return 0;
+}
+
+// Load GLX extensions
+static int load_tfp_extensions(VADriverContextP ctx)
+{
+    VAOpenGLVTableP pOpenGLVTable = gl_get_vtable(ctx);
+
+    pOpenGLVTable->glx_create_pixmap = (PFNGLXCREATEPIXMAPPROC)
+        get_proc_address("glXCreatePixmap");
+    if (!pOpenGLVTable->glx_create_pixmap)
+        return 0;
+    pOpenGLVTable->glx_destroy_pixmap = (PFNGLXDESTROYPIXMAPPROC)
+        get_proc_address("glXDestroyPixmap");
+    if (!pOpenGLVTable->glx_destroy_pixmap)
+        return 0;
+    pOpenGLVTable->glx_bind_tex_image = (PFNGLXBINDTEXIMAGEEXTPROC)
+        get_proc_address("glXBindTexImageEXT");
+    if (!pOpenGLVTable->glx_bind_tex_image)
+        return 0;
+    pOpenGLVTable->glx_release_tex_image = (PFNGLXRELEASETEXIMAGEEXTPROC)
+        get_proc_address("glXReleaseTexImageEXT");
+    if (!pOpenGLVTable->glx_release_tex_image)
+        return 0;
+    return 1;
+}
+
+static int load_fbo_extensions(VADriverContextP ctx)
+{
+    VAOpenGLVTableP pOpenGLVTable = gl_get_vtable(ctx);
+
+    pOpenGLVTable->gl_gen_framebuffers = (PFNGLGENFRAMEBUFFERSEXTPROC)
+        get_proc_address("glGenFramebuffersEXT");
+    if (!pOpenGLVTable->gl_gen_framebuffers)
+        return 0;
+    pOpenGLVTable->gl_delete_framebuffers = (PFNGLDELETEFRAMEBUFFERSEXTPROC)
+        get_proc_address("glDeleteFramebuffersEXT");
+    if (!pOpenGLVTable->gl_delete_framebuffers)
+        return 0;
+    pOpenGLVTable->gl_bind_framebuffer = (PFNGLBINDFRAMEBUFFEREXTPROC)
+        get_proc_address("glBindFramebufferEXT");
+    if (!pOpenGLVTable->gl_bind_framebuffer)
+        return 0;
+    pOpenGLVTable->gl_gen_renderbuffers = (PFNGLGENRENDERBUFFERSEXTPROC)
+        get_proc_address("glGenRenderbuffersEXT");
+    if (!pOpenGLVTable->gl_gen_renderbuffers)
+        return 0;
+    pOpenGLVTable->gl_delete_renderbuffers = (PFNGLDELETERENDERBUFFERSEXTPROC)
+        get_proc_address("glDeleteRenderbuffersEXT");
+    if (!pOpenGLVTable->gl_delete_renderbuffers)
+        return 0;
+    pOpenGLVTable->gl_bind_renderbuffer = (PFNGLBINDRENDERBUFFEREXTPROC)
+        get_proc_address("glBindRenderbufferEXT");
+    if (!pOpenGLVTable->gl_bind_renderbuffer)
+        return 0;
+    pOpenGLVTable->gl_renderbuffer_storage = (PFNGLRENDERBUFFERSTORAGEEXTPROC)
+        get_proc_address("glRenderbufferStorageEXT");
+    if (!pOpenGLVTable->gl_renderbuffer_storage)
+        return 0;
+    pOpenGLVTable->gl_framebuffer_renderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC)
+        get_proc_address("glFramebufferRenderbufferEXT");
+    if (!pOpenGLVTable->gl_framebuffer_renderbuffer)
+        return 0;
+    pOpenGLVTable->gl_framebuffer_texture_2d = (PFNGLFRAMEBUFFERTEXTURE2DEXTPROC)
+        get_proc_address("glFramebufferTexture2DEXT");
+    if (!pOpenGLVTable->gl_framebuffer_texture_2d)
+        return 0;
+    pOpenGLVTable->gl_check_framebuffer_status = (PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC)
+        get_proc_address("glCheckFramebufferStatusEXT");
+    if (!pOpenGLVTable->gl_check_framebuffer_status)
+        return 0;
+    return 1;
+}
+
+
+/* ========================================================================= */
+/* === VA/GLX helpers                                                    === */
+/* ========================================================================= */
+
+// OpenGL context state
+typedef struct OpenGLContextState *OpenGLContextStateP;
+
+struct OpenGLContextState {
+    Display     *display;
+    Window       window;
+    GLXContext   context;
+};
+
+static void
+gl_destroy_context(OpenGLContextStateP cs)
+{
+    if (!cs)
+        return;
+
+    if (cs->display && cs->context) {
+        if (glXGetCurrentContext() == cs->context)
+            glXMakeCurrent(cs->display, None, NULL);
+        glXDestroyContext(cs->display, cs->context);
+        cs->display = NULL;
+        cs->context = NULL;
+    }
+    free(cs);
+}
+
+static OpenGLContextStateP
+gl_create_context(VADriverContextP ctx, OpenGLContextStateP parent)
+{
+    OpenGLContextStateP cs;
+    GLXFBConfig *fbconfigs = NULL;
+    int fbconfig_id, val, n, n_fbconfigs;
+    Status status;
+
+    static GLint fbconfig_attrs[] = {
+        GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
+        GLX_RENDER_TYPE,   GLX_RGBA_BIT,
+        GLX_DOUBLEBUFFER,  True,
+        GLX_RED_SIZE,      8,
+        GLX_GREEN_SIZE,    8, 
+        GLX_BLUE_SIZE,     8,
+        None
+    };
+
+    cs = malloc(sizeof(*cs));
+    if (!cs)
+        goto error;
+
+    cs->display = ctx->native_dpy;
+    cs->window  = parent ? parent->window : None;
+    cs->context = NULL;
+
+    if (parent && parent->context) {
+        status = glXQueryContext(
+            parent->display,
+            parent->context,
+            GLX_FBCONFIG_ID, &fbconfig_id
+        );
+        if (status != Success)
+            goto error;
+
+        if (fbconfig_id == GLX_DONT_CARE)
+            goto choose_fbconfig;
+
+        fbconfigs = glXGetFBConfigs(
+            ctx->native_dpy,
+            ctx->x11_screen,
+            &n_fbconfigs
+        );
+        if (!fbconfigs)
+            goto error;
+
+        /* Find out a GLXFBConfig compatible with the parent context */
+        for (n = 0; n < n_fbconfigs; n++) {
+            status = glXGetFBConfigAttrib(
+                ctx->native_dpy,
+                fbconfigs[n],
+                GLX_FBCONFIG_ID, &val
+            );
+            if (status == Success && val == fbconfig_id)
+                break;
+        }
+        if (n == n_fbconfigs)
+            goto error;
+    }
+    else {
+    choose_fbconfig:
+        fbconfigs = glXChooseFBConfig(
+            ctx->native_dpy,
+            ctx->x11_screen,
+            fbconfig_attrs, &n_fbconfigs
+        );
+        if (!fbconfigs)
+            goto error;
+
+        /* Select the first one */
+        n = 0;
+    }
+
+    cs->context = glXCreateNewContext(
+        ctx->native_dpy,
+        fbconfigs[n],
+        GLX_RGBA_TYPE,
+        parent ? parent->context : NULL,
+        True
+    );
+    if (cs->context)
+        goto end;
+
+error:
+    gl_destroy_context(cs);
+    cs = NULL;
+end:
+    if (fbconfigs)
+        XFree(fbconfigs);
+    return cs;
+}
+
+static void gl_get_current_context(OpenGLContextStateP cs)
+{
+    cs->display = glXGetCurrentDisplay();
+    cs->window  = glXGetCurrentDrawable();
+    cs->context = glXGetCurrentContext();
+}
+
+static int
+gl_set_current_context(OpenGLContextStateP new_cs, OpenGLContextStateP old_cs)
+{
+    /* If display is NULL, this could be that new_cs was retrieved from
+       gl_get_current_context() with none set previously. If that case,
+       the other fields are also NULL and we don't return an error */
+    if (!new_cs->display)
+        return !new_cs->window && !new_cs->context;
+
+    if (old_cs) {
+        if (old_cs == new_cs)
+            return 1;
+        gl_get_current_context(old_cs);
+        if (old_cs->display == new_cs->display &&
+            old_cs->window  == new_cs->window  &&
+            old_cs->context == new_cs->context)
+            return 1;
+    }
+    return glXMakeCurrent(new_cs->display, new_cs->window, new_cs->context);
+}
+
+/** Unique VASurfaceGLX identifier */
+#define VA_SURFACE_GLX_MAGIC VA_FOURCC('V','A','G','L')
+
+struct VASurfaceGLX {
+    uint32_t            magic;      ///< Magic number identifying a VASurfaceGLX
+    GLenum              target;     ///< GL target to which the texture is bound
+    GLuint              texture;    ///< GL texture
+    VASurfaceID         surface;    ///< Associated VA surface
+    unsigned int        width;
+    unsigned int        height;
+    OpenGLContextStateP gl_context;
+    int                 is_bound;
+    Pixmap              pixmap;
+    GLuint              pix_texture;
+    GLXPixmap           glx_pixmap;
+    GLuint              fbo;
+};
+
+// Create Pixmaps for GLX texture-from-pixmap extension
+static int create_tfp_surface(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    VAOpenGLVTableP const pOpenGLVTable = gl_get_vtable(ctx);
+    const unsigned int    width         = pSurfaceGLX->width;
+    const unsigned int    height        = pSurfaceGLX->height;
+    Pixmap                pixmap        = None;
+    GLXFBConfig          *fbconfig      = NULL;
+    GLXPixmap             glx_pixmap    = None;
+    Window                root_window;
+    XWindowAttributes     wattr;
+    int                  *attrib;
+    int                   n_fbconfig_attrs;
+
+    root_window = RootWindow(ctx->native_dpy, ctx->x11_screen);
+    XGetWindowAttributes(ctx->native_dpy, root_window, &wattr);
+    if (wattr.depth != 24 && wattr.depth != 32)
+        return 0;
+    pixmap = XCreatePixmap(
+        ctx->native_dpy,
+        root_window,
+        width,
+        height,
+        wattr.depth
+    );
+    if (!pixmap)
+        return 0;
+    pSurfaceGLX->pixmap = pixmap;
+
+    int fbconfig_attrs[32] = {
+        GLX_DRAWABLE_TYPE,      GLX_PIXMAP_BIT,
+        GLX_DOUBLEBUFFER,       GL_TRUE,
+        GLX_RENDER_TYPE,        GLX_RGBA_BIT,
+        GLX_X_RENDERABLE,       GL_TRUE,
+        GLX_Y_INVERTED_EXT,     GL_TRUE,
+        GLX_RED_SIZE,           8,
+        GLX_GREEN_SIZE,         8,
+        GLX_BLUE_SIZE,          8,
+        GL_NONE,
+    };
+    for (attrib = fbconfig_attrs; *attrib != GL_NONE; attrib += 2)
+        ;
+    *attrib++ = GLX_DEPTH_SIZE;                 *attrib++ = wattr.depth;
+    if (wattr.depth == 32) {
+    *attrib++ = GLX_ALPHA_SIZE;                 *attrib++ = 8;
+    *attrib++ = GLX_BIND_TO_TEXTURE_RGBA_EXT;   *attrib++ = GL_TRUE;
+    }
+    else {
+    *attrib++ = GLX_BIND_TO_TEXTURE_RGB_EXT;    *attrib++ = GL_TRUE;
+    }
+    *attrib++ = GL_NONE;
+
+    fbconfig = glXChooseFBConfig(
+        ctx->native_dpy,
+        ctx->x11_screen,
+        fbconfig_attrs,
+        &n_fbconfig_attrs
+    );
+    if (!fbconfig)
+        return 0;
+
+    int pixmap_attrs[10] = {
+        GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
+        GLX_MIPMAP_TEXTURE_EXT, GL_FALSE,
+        GL_NONE,
+    };
+    for (attrib = pixmap_attrs; *attrib != GL_NONE; attrib += 2)
+        ;
+    *attrib++ = GLX_TEXTURE_FORMAT_EXT;
+    if (wattr.depth == 32)
+    *attrib++ = GLX_TEXTURE_FORMAT_RGBA_EXT;
+    else
+    *attrib++ = GLX_TEXTURE_FORMAT_RGB_EXT;
+    *attrib++ = GL_NONE;
+
+    x11_trap_errors();
+    glx_pixmap = pOpenGLVTable->glx_create_pixmap(
+        ctx->native_dpy,
+        fbconfig[0],
+        pixmap,
+        pixmap_attrs
+    );
+    free(fbconfig);
+    if (x11_untrap_errors() != 0)
+        return 0;
+    pSurfaceGLX->glx_pixmap = glx_pixmap;
+
+    glGenTextures(1, &pSurfaceGLX->pix_texture);
+    glBindTexture(GL_TEXTURE_2D, pSurfaceGLX->pix_texture);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    return 1;
+}
+
+// Destroy Pixmaps used for TFP
+static void destroy_tfp_surface(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    VAOpenGLVTableP const pOpenGLVTable = gl_get_vtable(ctx);
+
+    if (pSurfaceGLX->pix_texture) {
+        glDeleteTextures(1, &pSurfaceGLX->pix_texture);
+        pSurfaceGLX->pix_texture = 0;
+    }
+
+    if (pSurfaceGLX->glx_pixmap) {
+        pOpenGLVTable->glx_destroy_pixmap(ctx->native_dpy, pSurfaceGLX->glx_pixmap);
+        pSurfaceGLX->glx_pixmap = None;
+    }
+
+    if (pSurfaceGLX->pixmap) {
+        XFreePixmap(ctx->native_dpy, pSurfaceGLX->pixmap);
+        pSurfaceGLX->pixmap = None;
+    }
+}
+
+// Bind GLX Pixmap to texture
+static int bind_pixmap(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    VAOpenGLVTableP pOpenGLVTable = gl_get_vtable(ctx);
+
+    if (pSurfaceGLX->is_bound)
+        return 1;
+
+    glBindTexture(GL_TEXTURE_2D, pSurfaceGLX->pix_texture);
+
+    x11_trap_errors();
+    pOpenGLVTable->glx_bind_tex_image(
+        ctx->native_dpy,
+        pSurfaceGLX->glx_pixmap,
+        GLX_FRONT_LEFT_EXT,
+        NULL
+    );
+    XSync(ctx->native_dpy, False);
+    if (x11_untrap_errors() != 0) {
+        va_glx_error_message("failed to bind pixmap\n");
+        return 0;
+    }
+
+    pSurfaceGLX->is_bound = 1;
+    return 1;
+}
+
+// Release GLX Pixmap from texture
+static int unbind_pixmap(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    VAOpenGLVTableP pOpenGLVTable = gl_get_vtable(ctx);
+
+    if (!pSurfaceGLX->is_bound)
+        return 1;
+
+    x11_trap_errors();
+    pOpenGLVTable->glx_release_tex_image(
+        ctx->native_dpy,
+        pSurfaceGLX->glx_pixmap,
+        GLX_FRONT_LEFT_EXT
+    );
+    XSync(ctx->native_dpy, False);
+    if (x11_untrap_errors() != 0) {
+        va_glx_error_message("failed to release pixmap\n");
+        return 0;
+    }
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    pSurfaceGLX->is_bound = 0;
+    return 1;
+}
+
+// Render GLX Pixmap to texture
+static void render_pixmap(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    const unsigned int w = pSurfaceGLX->width;
+    const unsigned int h = pSurfaceGLX->height;
+
+    glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
+    glBegin(GL_QUADS);
+    {
+        glTexCoord2f(0.0f, 0.0f); glVertex2i(0, 0);
+        glTexCoord2f(0.0f, 1.0f); glVertex2i(0, h);
+        glTexCoord2f(1.0f, 1.0f); glVertex2i(w, h);
+        glTexCoord2f(1.0f, 0.0f); glVertex2i(w, 0);
+    }
+    glEnd();
+}
+
+// Create offscreen surface
+static int create_fbo_surface(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    VAOpenGLVTableP pOpenGLVTable = gl_get_vtable(ctx);
+    GLuint fbo;
+    GLenum status;
+
+    pOpenGLVTable->gl_gen_framebuffers(1, &fbo);
+    pOpenGLVTable->gl_bind_framebuffer(GL_FRAMEBUFFER_EXT, fbo);
+    pOpenGLVTable->gl_framebuffer_texture_2d(
+        GL_FRAMEBUFFER_EXT,
+        GL_COLOR_ATTACHMENT0_EXT,
+        GL_TEXTURE_2D,
+        pSurfaceGLX->texture,
+        0
+    );
+
+    status = pOpenGLVTable->gl_check_framebuffer_status(GL_DRAW_FRAMEBUFFER_EXT);
+    pOpenGLVTable->gl_bind_framebuffer(GL_FRAMEBUFFER_EXT, 0);
+    if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
+        return 0;
+
+    pSurfaceGLX->fbo = fbo;
+    return 1;
+}
+
+// Destroy offscreen surface
+static void destroy_fbo_surface(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    VAOpenGLVTableP pOpenGLVTable = gl_get_vtable(ctx);
+
+    if (pSurfaceGLX->fbo) {
+        pOpenGLVTable->gl_delete_framebuffers(1, &pSurfaceGLX->fbo);
+        pSurfaceGLX->fbo = 0;
+    }
+}
+
+// Setup matrices to match the FBO texture dimensions
+static void fbo_enter(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    VAOpenGLVTableP pOpenGLVTable = gl_get_vtable(ctx);
+    const unsigned int width  = pSurfaceGLX->width;
+    const unsigned int height = pSurfaceGLX->height;
+
+    pOpenGLVTable->gl_bind_framebuffer(GL_FRAMEBUFFER_EXT, pSurfaceGLX->fbo);
+    glPushAttrib(GL_VIEWPORT_BIT);
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+    glLoadIdentity();
+    glMatrixMode(GL_MODELVIEW);
+    glPushMatrix();
+    glLoadIdentity();
+    glViewport(0, 0, width, height);
+    glTranslatef(-1.0f, -1.0f, 0.0f);
+    glScalef(2.0f / width, 2.0f / height, 1.0f);
+}
+
+// Restore original OpenGL matrices
+static void fbo_leave(VADriverContextP ctx)
+{
+    VAOpenGLVTableP pOpenGLVTable = gl_get_vtable(ctx);
+
+    glPopAttrib();
+    glMatrixMode(GL_PROJECTION);
+    glPopMatrix();
+    glMatrixMode(GL_MODELVIEW);
+    glPopMatrix();
+    pOpenGLVTable->gl_bind_framebuffer(GL_FRAMEBUFFER_EXT, 0);
+}
+
+// Check internal texture format is supported
+static int is_supported_internal_format(GLenum format)
+{
+    /* XXX: we don't support other textures than RGBA */
+    switch (format) {
+    case 4:
+    case GL_RGBA:
+    case GL_RGBA8:
+        return 1;
+    }
+    return 0;
+}
+
+// Destroy VA/GLX surface
+static void
+destroy_surface(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    unbind_pixmap(ctx, pSurfaceGLX);
+    destroy_fbo_surface(ctx, pSurfaceGLX);
+    destroy_tfp_surface(ctx, pSurfaceGLX);
+    free(pSurfaceGLX);
+}
+
+// Create VA/GLX surface
+static VASurfaceGLXP
+create_surface(VADriverContextP ctx, GLenum target, GLuint texture)
+{
+    VASurfaceGLXP pSurfaceGLX = NULL;
+    unsigned int internal_format, border_width, width, height;
+    int is_error = 1;
+
+    pSurfaceGLX = malloc(sizeof(*pSurfaceGLX));
+    if (!pSurfaceGLX)
+        goto end;
+
+    pSurfaceGLX->magic          = VA_SURFACE_GLX_MAGIC;
+    pSurfaceGLX->target         = target;
+    pSurfaceGLX->texture        = texture;
+    pSurfaceGLX->surface        = VA_INVALID_SURFACE;
+    pSurfaceGLX->gl_context     = NULL;
+    pSurfaceGLX->is_bound       = 0;
+    pSurfaceGLX->pixmap         = None;
+    pSurfaceGLX->pix_texture    = 0;
+    pSurfaceGLX->glx_pixmap     = None;
+    pSurfaceGLX->fbo            = 0;
+
+    glEnable(target);
+    glBindTexture(target, texture);
+    if (!gl_get_texture_param(GL_TEXTURE_INTERNAL_FORMAT, &internal_format))
+        goto end;
+    if (!is_supported_internal_format(internal_format))
+        goto end;
+
+    /* Check texture dimensions */
+    if (!gl_get_texture_param(GL_TEXTURE_BORDER, &border_width))
+        goto end;
+    if (!gl_get_texture_param(GL_TEXTURE_WIDTH, &width))
+        goto end;
+    if (!gl_get_texture_param(GL_TEXTURE_HEIGHT, &height))
+        goto end;
+
+    width  -= 2 * border_width;
+    height -= 2 * border_width;
+    if (width == 0 || height == 0)
+        goto end;
+
+    pSurfaceGLX->width  = width;
+    pSurfaceGLX->height = height;
+
+    /* Create TFP objects */
+    if (!create_tfp_surface(ctx, pSurfaceGLX))
+        goto end;
+
+    /* Create FBO objects */
+    if (!create_fbo_surface(ctx, pSurfaceGLX))
+        goto end;
+
+    is_error = 0;
+end:
+    if (is_error && pSurfaceGLX) {
+        destroy_surface(ctx, pSurfaceGLX);
+        pSurfaceGLX = NULL;
+    }
+    return pSurfaceGLX;
+}
+
+
+/* ========================================================================= */
+/* === VA/GLX implementation from the driver (fordward calls)            === */
+/* ========================================================================= */
+
+#define INVOKE(ctx, func, args) do {                    \
+        VADriverVTableGLXP vtable = (ctx)->vtable_glx;  \
+        if (!vtable->va##func##GLX)                     \
+            return VA_STATUS_ERROR_UNIMPLEMENTED;       \
+                                                        \
+        VAStatus status = vtable->va##func##GLX args;   \
+        if (status != VA_STATUS_SUCCESS)                \
+            return status;                              \
+    } while (0)
+
+static VAStatus
+vaCreateSurfaceGLX_impl_driver(
+    VADriverContextP    ctx,
+    GLenum              target,
+    GLuint              texture,
+    void              **gl_surface
+)
+{
+    INVOKE(ctx, CreateSurface, (ctx, target, texture, gl_surface));
+    return VA_STATUS_SUCCESS;
+}
+
+static VAStatus
+vaDestroySurfaceGLX_impl_driver(VADriverContextP ctx, void *gl_surface)
+{
+    INVOKE(ctx, DestroySurface, (ctx, gl_surface));
+    return VA_STATUS_SUCCESS;
+}
+
+static VAStatus
+vaCopySurfaceGLX_impl_driver(
+    VADriverContextP    ctx,
+    void               *gl_surface,
+    VASurfaceID         surface,
+    unsigned int        flags
+)
+{
+    INVOKE(ctx, CopySurface, (ctx, gl_surface, surface, flags));
+    return VA_STATUS_SUCCESS;
+}
+
+#undef INVOKE
+
+
+/* ========================================================================= */
+/* === VA/GLX implementation from libVA (generic and suboptimal path)    === */
+/* ========================================================================= */
+
+#define INIT_SURFACE(surface, surface_arg) do {         \
+        surface = (VASurfaceGLXP)(surface_arg);         \
+        if (!check_surface(surface))                    \
+            return VA_STATUS_ERROR_INVALID_SURFACE;     \
+    } while (0)
+
+// Check VASurfaceGLX is valid
+static inline int check_surface(VASurfaceGLXP pSurfaceGLX)
+{
+    return pSurfaceGLX && pSurfaceGLX->magic == VA_SURFACE_GLX_MAGIC;
+}
+
+static VAStatus
+vaCreateSurfaceGLX_impl_libva(
+    VADriverContextP    ctx,
+    GLenum              target,
+    GLuint              texture,
+    void              **gl_surface
+)
+{
+    VASurfaceGLXP pSurfaceGLX;
+    struct OpenGLContextState old_cs, *new_cs;
+
+    gl_get_current_context(&old_cs);
+    new_cs = gl_create_context(ctx, &old_cs);
+    if (!new_cs)
+        return VA_STATUS_ERROR_ALLOCATION_FAILED;
+    if (!gl_set_current_context(new_cs, NULL))
+        return VA_STATUS_ERROR_OPERATION_FAILED;
+
+    pSurfaceGLX = create_surface(ctx, target, texture);
+    if (!pSurfaceGLX)
+        return VA_STATUS_ERROR_ALLOCATION_FAILED;
+
+    pSurfaceGLX->gl_context = new_cs;
+    *gl_surface = pSurfaceGLX;
+
+    gl_set_current_context(&old_cs, NULL);
+    return VA_STATUS_SUCCESS;
+}
+
+static VAStatus
+vaDestroySurfaceGLX_impl_libva(VADriverContextP ctx, void *gl_surface)
+{
+    VASurfaceGLXP pSurfaceGLX;
+    struct OpenGLContextState old_cs, *new_cs;
+
+    INIT_SURFACE(pSurfaceGLX, gl_surface);
+
+    new_cs = pSurfaceGLX->gl_context;
+    if (!gl_set_current_context(new_cs, &old_cs))
+        return VA_STATUS_ERROR_OPERATION_FAILED;
+
+    destroy_surface(ctx, pSurfaceGLX);
+
+    gl_destroy_context(new_cs);
+    gl_set_current_context(&old_cs, NULL);
+    return VA_STATUS_SUCCESS;
+}
+
+static inline VAStatus
+deassociate_surface(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    if (!unbind_pixmap(ctx, pSurfaceGLX))
+        return VA_STATUS_ERROR_OPERATION_FAILED;
+
+    pSurfaceGLX->surface = VA_INVALID_SURFACE;
+    return VA_STATUS_SUCCESS;
+}
+
+static VAStatus
+associate_surface(
+    VADriverContextP    ctx,
+    VASurfaceGLXP       pSurfaceGLX,
+    VASurfaceID         surface,
+    unsigned int        flags
+)
+{
+    VAStatus status;
+
+    /* XXX: optimise case where we are associating the same VA surface
+       as before an no changed occurred to it */
+    status = deassociate_surface(ctx, pSurfaceGLX);
+    if (status != VA_STATUS_SUCCESS)
+        return status;
+
+    x11_trap_errors();
+    status = ctx->vtable->vaPutSurface(
+        ctx,
+        surface,
+        (void *)pSurfaceGLX->pixmap,
+        0, 0, pSurfaceGLX->width, pSurfaceGLX->height,
+        0, 0, pSurfaceGLX->width, pSurfaceGLX->height,
+        NULL, 0,
+        flags
+    );
+    XSync(ctx->native_dpy, False);
+    if (x11_untrap_errors() != 0)
+        return VA_STATUS_ERROR_OPERATION_FAILED;
+    if (status != VA_STATUS_SUCCESS)
+        return status;
+
+    pSurfaceGLX->surface = surface;
+    return VA_STATUS_SUCCESS;
+}
+
+static inline VAStatus
+sync_surface(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    if (pSurfaceGLX->surface == VA_INVALID_SURFACE)
+        return VA_STATUS_ERROR_INVALID_SURFACE;
+
+    return ctx->vtable->vaSyncSurface(ctx, pSurfaceGLX->surface);
+}
+
+static inline VAStatus
+begin_render_surface(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    VAStatus status;
+
+    status = sync_surface(ctx, pSurfaceGLX);
+    if (status != VA_STATUS_SUCCESS)
+        return status;
+
+    if (!bind_pixmap(ctx, pSurfaceGLX))
+        return VA_STATUS_ERROR_OPERATION_FAILED;
+
+    return VA_STATUS_SUCCESS;
+}
+
+static inline VAStatus
+end_render_surface(VADriverContextP ctx, VASurfaceGLXP pSurfaceGLX)
+{
+    if (!unbind_pixmap(ctx, pSurfaceGLX))
+        return VA_STATUS_ERROR_OPERATION_FAILED;
+
+    return VA_STATUS_SUCCESS;
+}
+
+static VAStatus
+copy_surface(
+    VADriverContextP    ctx,
+    VASurfaceGLXP       pSurfaceGLX,
+    VASurfaceID         surface,
+    unsigned int        flags
+)
+{
+    VAStatus status;
+
+    /* Associate VA surface */
+    status = associate_surface(ctx, pSurfaceGLX, surface, flags);
+    if (status != VA_STATUS_SUCCESS)
+        return status;
+
+    /* Render to FBO */
+    fbo_enter(ctx, pSurfaceGLX);
+    status = begin_render_surface(ctx, pSurfaceGLX);
+    if (status == VA_STATUS_SUCCESS) {
+        render_pixmap(ctx, pSurfaceGLX);
+        status = end_render_surface(ctx, pSurfaceGLX);
+    }
+    fbo_leave(ctx);
+    if (status != VA_STATUS_SUCCESS)
+        return status;
+
+    return deassociate_surface(ctx, pSurfaceGLX);
+}
+
+static VAStatus
+vaCopySurfaceGLX_impl_libva(
+    VADriverContextP    ctx,
+    void               *gl_surface,
+    VASurfaceID         surface,
+    unsigned int        flags
+)
+{
+    VASurfaceGLXP pSurfaceGLX;
+    VAStatus status;
+    struct OpenGLContextState old_cs;
+
+    INIT_SURFACE(pSurfaceGLX, gl_surface);
+
+    if (!gl_set_current_context(pSurfaceGLX->gl_context, &old_cs))
+        return VA_STATUS_ERROR_OPERATION_FAILED;
+
+    status = copy_surface(ctx, pSurfaceGLX, surface, flags);
+
+    gl_set_current_context(&old_cs, NULL);
+    return status;
+}
+
+#undef INIT_SURFACE
+
+
+/* ========================================================================= */
+/* === Private VA/GLX vtable initialization                              === */
+/* ========================================================================= */
+
+// Initialize GLX driver context
+VAStatus va_glx_init_context(VADriverContextP ctx)
+{
+    VADriverContextGLXP glx_ctx = VA_DRIVER_CONTEXT_GLX(ctx);
+    VADriverVTableGLXP  vtable  = &glx_ctx->vtable;
+    int glx_major, glx_minor;
+
+    if (glx_ctx->is_initialized)
+        return VA_STATUS_SUCCESS;
+
+    if (ctx->vtable_glx && ctx->vtable_glx->vaCopySurfaceGLX) {
+        vtable->vaCreateSurfaceGLX      = vaCreateSurfaceGLX_impl_driver;
+        vtable->vaDestroySurfaceGLX     = vaDestroySurfaceGLX_impl_driver;
+        vtable->vaCopySurfaceGLX        = vaCopySurfaceGLX_impl_driver;
+    }
+    else {
+        vtable->vaCreateSurfaceGLX      = vaCreateSurfaceGLX_impl_libva;
+        vtable->vaDestroySurfaceGLX     = vaDestroySurfaceGLX_impl_libva;
+        vtable->vaCopySurfaceGLX        = vaCopySurfaceGLX_impl_libva;
+
+        if (!glXQueryVersion(ctx->native_dpy, &glx_major, &glx_minor))
+            return VA_STATUS_ERROR_UNIMPLEMENTED;
+
+        if (!check_tfp_extensions(ctx) || !load_tfp_extensions(ctx))
+            return VA_STATUS_ERROR_UNIMPLEMENTED;
+
+        if (!check_fbo_extensions(ctx) || !load_fbo_extensions(ctx))
+            return VA_STATUS_ERROR_UNIMPLEMENTED;
+    }
+
+    glx_ctx->is_initialized = 1;
+    return VA_STATUS_SUCCESS;
+}