+/**
+ * Emit fragment position/ooordinate code.
+ */
+static void
+emit_wpos(struct st_context *st,
+ struct st_translate *t,
+ const struct gl_program *program,
+ struct ureg_program *ureg)
+{
+ const struct gl_fragment_program *fp =
+ (const struct gl_fragment_program *) program;
+ struct pipe_screen *pscreen = st->pipe->screen;
+ boolean invert = FALSE;
+
+ if (fp->OriginUpperLeft) {
+ if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT)) {
+ }
+ else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT)) {
+ ureg_property_fs_coord_origin(ureg, TGSI_FS_COORD_ORIGIN_LOWER_LEFT);
+ invert = TRUE;
+ }
+ else
+ assert(0);
+ }
+ else {
+ if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT))
+ ureg_property_fs_coord_origin(ureg, TGSI_FS_COORD_ORIGIN_LOWER_LEFT);
+ else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT))
+ invert = TRUE;
+ else
+ assert(0);
+ }
+
+ if (fp->PixelCenterInteger) {
+ if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER))
+ ureg_property_fs_coord_pixel_center(ureg, TGSI_FS_COORD_PIXEL_CENTER_INTEGER);
+ else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER))
+ emit_adjusted_wpos(t, program, invert ? 0.5f : -0.5f);
+ else
+ assert(0);
+ }
+ else {
+ if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER)) {
+ }
+ else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER)) {
+ ureg_property_fs_coord_pixel_center(ureg, TGSI_FS_COORD_PIXEL_CENTER_INTEGER);
+ emit_adjusted_wpos(t, program, invert ? -0.5f : 0.5f);
+ }
+ else
+ assert(0);
+ }
+
+ /* we invert after adjustment so that we avoid the MOV to temporary,
+ * and reuse the adjustment ADD instead */
+ if (invert)
+ emit_inverted_wpos(t, program);
+}
+
+