+/**
+ * Query the default gallium screen for a Z/Stencil format that
+ * at least matches the given depthBits and stencilBits.
+ */
+static void
+xmesa_choose_z_stencil_format(int depthBits, int stencilBits,
+ enum pipe_format *depthFormat,
+ enum pipe_format *stencilFormat)
+{
+ const enum pipe_texture_target target = PIPE_TEXTURE_2D;
+ const unsigned tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
+ const unsigned geom_flags = (PIPE_TEXTURE_GEOM_NON_SQUARE |
+ PIPE_TEXTURE_GEOM_NON_POWER_OF_TWO);
+ static enum pipe_format formats[] = {
+ PIPE_FORMAT_Z24S8_UNORM,
+ PIPE_FORMAT_S8Z24_UNORM,
+ PIPE_FORMAT_Z16_UNORM,
+ PIPE_FORMAT_Z32_UNORM
+ };
+ int i;
+
+ assert(screen);
+
+ *depthFormat = *stencilFormat = PIPE_FORMAT_NONE;
+
+ /* search for supported format */
+ for (i = 0; i < Elements(formats); i++) {
+ if (screen->is_format_supported(screen, formats[i],
+ target, tex_usage, geom_flags)) {
+ *depthFormat = formats[i];
+ break;
+ }
+ }
+
+ if (stencilBits) {
+ *stencilFormat = *depthFormat;
+ }
+
+ /* XXX we should check that he chosen format has at least as many bits
+ * as what was requested.
+ */
+}
+
+
+