+static gl_format
+get_texbuffer_format(struct gl_renderbuffer *rb, GLint format)
+{
+ struct nouveau_surface *s = &to_nouveau_renderbuffer(rb)->surface;
+
+ if (s->cpp < 4)
+ return s->format;
+ else if (format == __DRI_TEXTURE_FORMAT_RGBA)
+ return MESA_FORMAT_ARGB8888;
+ else
+ return MESA_FORMAT_XRGB8888;
+}
+
+void
+nouveau_set_texbuffer(__DRIcontext *dri_ctx,
+ GLint target, GLint format,
+ __DRIdrawable *draw)
+{
+ struct nouveau_context *nctx = dri_ctx->driverPrivate;
+ GLcontext *ctx = &nctx->base;
+ struct gl_framebuffer *fb = draw->driverPrivate;
+ struct gl_renderbuffer *rb =
+ fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer;
+ struct gl_texture_object *t = _mesa_get_current_tex_object(ctx, target);
+ struct gl_texture_image *ti;
+ struct nouveau_surface *s;
+
+ _mesa_lock_texture(ctx, t);
+ ti = _mesa_get_tex_image(ctx, t, target, 0);
+ s = &to_nouveau_teximage(ti)->surface;
+
+ /* Update the texture surface with the given drawable. */
+ nouveau_update_renderbuffers(dri_ctx, draw);
+ nouveau_surface_ref(&to_nouveau_renderbuffer(rb)->surface, s);
+
+ /* Update the image fields. */
+ _mesa_init_teximage_fields(ctx, target, ti, s->width, s->height,
+ 1, 0, s->cpp);
+ ti->RowStride = s->pitch / s->cpp;
+ ti->TexFormat = s->format = get_texbuffer_format(rb, format);
+
+ /* Try to validate it. */
+ if (!validate_teximage(ctx, t, 0, 0, 0, 0, s->width, s->height, 1))
+ nouveau_texture_reallocate(ctx, t);
+
+ context_dirty_i(ctx, TEX_OBJ, ctx->Texture.CurrentUnit);
+ context_dirty_i(ctx, TEX_ENV, ctx->Texture.CurrentUnit);
+
+ _mesa_unlock_texture(ctx, t);
+}
+