86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/* OpenGL/GLShader
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* #Keywords: OpenGL, shader
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*
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* Demonstrates using GskGLShaderNodes to integrate GLSL fragment shaders
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* with the Gtk widget rendering.
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*/
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#include <math.h>
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#include <gtk/gtk.h>
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#include "gtkshaderbin.h"
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static GtkWidget *demo_window = NULL;
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static void
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close_window (GtkWidget *widget)
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{
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/* Reset the state */
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demo_window = NULL;
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}
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static GtkWidget *
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fire_bin_new (void)
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{
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GtkWidget *bin = gtk_shader_bin_new ();
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GBytes *shader_b;
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GskGLShader *shader;
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shader_b = g_resources_lookup_data ("/glshader/fire.glsl", 0, NULL);
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shader = gsk_glshader_new ((const char *)g_bytes_get_data (shader_b, NULL));
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gsk_glshader_add_uniform (shader, "u_time", GSK_GLUNIFORM_TYPE_FLOAT);
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gtk_shader_bin_add_shader (GTK_SHADER_BIN (bin), shader, GTK_STATE_FLAG_PRELIGHT, GTK_STATE_FLAG_PRELIGHT);
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g_bytes_unref (shader_b);
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g_object_unref (shader);
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return bin;
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}
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static GtkWidget *
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create_glshader_window (GtkWidget *do_widget)
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{
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GtkWidget *window, *box, *button, *bin;
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window = gtk_window_new ();
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gtk_window_set_display (GTK_WINDOW (window), gtk_widget_get_display (do_widget));
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gtk_window_set_title (GTK_WINDOW (window), "glshader");
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g_signal_connect (window, "destroy", G_CALLBACK (close_window), NULL);
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box = gtk_box_new (GTK_ORIENTATION_VERTICAL, FALSE);
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gtk_widget_set_margin_start (box, 12);
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gtk_widget_set_margin_end (box, 12);
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gtk_widget_set_margin_top (box, 12);
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gtk_widget_set_margin_bottom (box, 12);
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gtk_box_set_spacing (GTK_BOX (box), 6);
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gtk_window_set_child (GTK_WINDOW (window), box);
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bin = fire_bin_new ();
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gtk_box_append (GTK_BOX (box), bin);
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button = gtk_button_new_with_label ("Click me");
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gtk_widget_set_receives_default (button, TRUE);
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gtk_shader_bin_set_child (GTK_SHADER_BIN (bin), button);
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bin = fire_bin_new ();
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gtk_box_append (GTK_BOX (box), bin);
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button = gtk_button_new_with_label ("Or me!");
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gtk_widget_set_receives_default (button, TRUE);
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gtk_shader_bin_set_child (GTK_SHADER_BIN (bin), button);
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return window;
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}
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GtkWidget *
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do_glshader (GtkWidget *do_widget)
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{
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if (!demo_window)
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demo_window = create_glshader_window (do_widget);
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if (!gtk_widget_get_visible (demo_window))
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gtk_widget_show (demo_window);
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else
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gtk_window_destroy (GTK_WINDOW (demo_window));
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return demo_window;
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}
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