diff --git a/gtk/src/gtk_shader_parameters.cpp b/gtk/src/gtk_shader_parameters.cpp
new file mode 100644
index 00000000..a774747e
--- /dev/null
+++ b/gtk/src/gtk_shader_parameters.cpp
@@ -0,0 +1,131 @@
+#include <gtk/gtk.h>
+#include <vector>
+#include <math.h>
+
+#include "gtk_s9x.h"
+#include "gtk_display.h"
+#include "gtk_shader_parameters.h"
+#include "shaders/glsl.h"
+
+static inline double snap_to_interval (double value, double interval)
+{
+    return round (value / interval) * interval;
+}
+
+void value_changed (GtkRange *range, gpointer user_data)
+{
+    GtkAdjustment *adj = gtk_range_get_adjustment (range);
+    double interval = gtk_adjustment_get_step_increment (adj);
+    double value = gtk_range_get_value (range);
+
+    value = snap_to_interval (value, interval);
+
+    gtk_range_set_value (range, value);
+}
+
+
+bool gtk_shader_parameters_dialog (GtkWindow *parent)
+{
+    GtkWidget *dialog;
+    std::vector<GLSLParam> *params = (std::vector<GLSLParam> *) S9xDisplayGetDriver()->get_parameters();
+
+    if (!params || params->size() == 0)
+        return false;
+
+    dialog = gtk_dialog_new_with_buttons (_("GLSL Shader Parameters"),
+                                          parent,
+                                          GTK_DIALOG_MODAL,
+                                          "gtk-cancel",
+                                          GTK_RESPONSE_CANCEL,
+                                          "gtk-apply",
+                                          GTK_RESPONSE_APPLY,
+                                          NULL);
+
+    GtkWidget *scrolled_window;
+
+    gtk_widget_set_size_request(dialog, 640, 480);
+
+    scrolled_window = gtk_scrolled_window_new (NULL, NULL);
+    gtk_widget_set_hexpand (scrolled_window, TRUE);
+    gtk_widget_set_vexpand (scrolled_window, TRUE);
+    gtk_widget_set_margin_start (scrolled_window, 5);
+    gtk_widget_set_margin_end (scrolled_window, 5);
+    gtk_widget_set_margin_top (scrolled_window, 5);
+    gtk_widget_set_margin_bottom (scrolled_window, 5);
+    gtk_container_add (GTK_CONTAINER (gtk_dialog_get_content_area (GTK_DIALOG(dialog))),
+                       scrolled_window);
+    GtkWidget *vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+    GtkWidget *grid = gtk_grid_new ();
+    gtk_grid_set_row_homogeneous (GTK_GRID (grid), TRUE);
+    gtk_container_add (GTK_CONTAINER (vbox), grid);
+    gtk_container_add (GTK_CONTAINER (scrolled_window), vbox);
+
+    GtkWidget **value_holders = new GtkWidget*[params->size()];
+
+    for (unsigned int i = 0; i < params->size(); i++)
+    {
+        GLSLParam *p = &(*params)[i];
+        GtkWidget *label = gtk_label_new (p->name);
+        gtk_label_set_xalign (GTK_LABEL (label), 0.0f);
+        gtk_widget_show (label);
+
+        gtk_grid_attach (GTK_GRID (grid), label, 0, i, 1, 1);
+
+        if (p->min == 0.0 && p->max == 1.0 && p->step == 1.0)
+        {
+            GtkWidget *check = gtk_check_button_new ();
+            gtk_grid_attach (GTK_GRID (grid), check, 1, i, 1, 1);
+            gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check), (int) p->val);
+            value_holders[i] = check;
+        }
+        else
+        {
+            GtkWidget *scale = gtk_scale_new_with_range (GTK_ORIENTATION_HORIZONTAL, p->min, p->max, p->step);
+            gtk_widget_set_hexpand (scale, TRUE);
+            gtk_grid_attach (GTK_GRID (grid), scale, 1, i, 1, 1);
+            gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_RIGHT);
+            gtk_scale_set_draw_value (GTK_SCALE (scale), TRUE);
+            gtk_scale_set_digits (GTK_SCALE (scale), 3);
+            gtk_range_set_value (GTK_RANGE (scale), p->val);
+            g_signal_connect_data (G_OBJECT (scale),
+                                   "value-changed",
+                                   G_CALLBACK (value_changed),
+                                   NULL,
+                                   NULL,
+                                   (GConnectFlags) 0);
+
+            value_holders[i] = scale;
+        }
+    }
+
+    gtk_widget_show_all (dialog);
+    int response = gtk_dialog_run (GTK_DIALOG(dialog));
+
+    if (response == GTK_RESPONSE_APPLY)
+    {
+        for (unsigned int i = 0; i < params->size(); i++)
+        {
+            GLSLParam *p = &(*params)[i];
+            if (p->min == 0.0 && p->max == 1.0 && p->step == 1.0)
+            {
+                int val = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (value_holders[i]));
+                p->val = (float) val;
+            }
+            else
+            {
+                p->val = gtk_range_get_value (GTK_RANGE (value_holders[i]));
+            }
+
+            p->val = snap_to_interval (p->val, p->step);
+
+            p->val = CLAMP (p->val, p->min, p->max);
+        }
+
+        S9xDeinitUpdate (top_level->last_width, top_level->last_height);
+    }
+
+    delete[] value_holders;
+    gtk_widget_destroy (dialog);
+
+    return true;
+}
diff --git a/gtk/src/gtk_shader_parameters.h b/gtk/src/gtk_shader_parameters.h
new file mode 100644
index 00000000..c2fbb424
--- /dev/null
+++ b/gtk/src/gtk_shader_parameters.h
@@ -0,0 +1,8 @@
+#ifndef __GTK_SHADER_PARAMETERS_H
+#define __GTK_SHADER_PARAMETERS_H
+
+#include <gtk/gtk.h>
+
+bool gtk_shader_parameters_dialog (GtkWindow *parent);
+
+#endif // __GTK_SHADER_PARAMETERS_H