+/**
+ * Create a temporary texture to hold an image of the given size.
+ * If width, height are not POT and the driver only handles POT textures,
+ * allocate the next larger size of texture that is POT.
+ */
+static struct pipe_texture *
+alloc_texture(struct st_context *st, GLsizei width, GLsizei height,
+ enum pipe_format texFormat)
+{
+ struct pipe_context *pipe = st->pipe;
+ struct pipe_screen *screen = pipe->screen;
+ struct pipe_texture *pt;
+ int ptw, pth;
+
+ ptw = width;
+ pth = height;
+
+ /* Need to use POT texture? */
+ if (!screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
+ int l2pt, maxSize;
+
+ l2pt = util_logbase2(width);
+ if (1 << l2pt != width) {
+ ptw = 1 << (l2pt + 1);
+ }
+
+ l2pt = util_logbase2(height);
+ if (1 << l2pt != height) {
+ pth = 1 << (l2pt + 1);
+ }
+
+ /* Check against maximum texture size */
+ maxSize = 1 << (pipe->screen->get_param(pipe->screen,
+ PIPE_CAP_MAX_TEXTURE_2D_LEVELS) - 1);
+ assert(ptw <= maxSize);
+ assert(pth <= maxSize);
+ }
+
+ pt = st_texture_create(st, PIPE_TEXTURE_2D, texFormat, 0,
+ ptw, pth, 1, PIPE_TEXTURE_USAGE_SAMPLER);
+
+ return pt;
+}
+
+