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90 lines
2.1 KiB
90 lines
2.1 KiB
/*
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* This file is part of MXE. See LICENSE.md for licensing information.
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*/
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#include <gtk/gtk.h>
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#include <gtk/gtkgl.h>
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#include <GL/gl.h>
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static gboolean eventExpose(GtkWidget *gl, GdkEventExpose *e, gpointer userData)
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{
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GdkGLContext *ctx = gtk_widget_get_gl_context(gl);
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GdkGLDrawable *drawable = gtk_widget_get_gl_drawable(gl);
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(void)e;
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(void)userData;
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gdk_gl_drawable_gl_begin(drawable, ctx);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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if (!gdk_gl_drawable_is_double_buffered(drawable))
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glFinish();
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else
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gdk_gl_drawable_swap_buffers(drawable);
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gdk_gl_drawable_gl_end(drawable);
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return TRUE;
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}
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static gboolean eventConfigure(GtkWidget *gl, GdkEventConfigure *e, gpointer userData)
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{
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const guint width = gl->allocation.width;
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const guint height = gl->allocation.height;
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(void)e;
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(void)userData;
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glLoadIdentity();
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glViewport(0, 0, width, height);
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glOrtho(-3.5, 3.5, -3.5 * (GLfloat)height / (GLfloat)width,
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3.5 * (GLfloat)height / (GLfloat)width, -3.5, 3.5);
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return TRUE;
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}
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int main(int argc, char *argv[])
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{
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GtkWidget* window;
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GtkWidget* gl;
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GdkGLConfig* glConfig;
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gtk_init(&argc, &argv);
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gtk_gl_init(&argc, &argv);
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window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
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gl = gtk_drawing_area_new();
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gtk_container_add(GTK_CONTAINER(window), gl);
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gtk_widget_set_events(gl, GDK_EXPOSURE_MASK);
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glConfig = gdk_gl_config_new_by_mode(
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GDK_GL_MODE_RGB |
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GDK_GL_MODE_ALPHA |
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GDK_GL_MODE_DEPTH |
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GDK_GL_MODE_DOUBLE);
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gtk_widget_set_gl_capability(gl, glConfig,
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NULL, TRUE, GDK_GL_RGBA_TYPE);
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g_signal_connect_swapped(
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G_OBJECT(window), "destroy",
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G_CALLBACK(gtk_main_quit), G_OBJECT(window));
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g_signal_connect(
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G_OBJECT(window), "destroy",
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G_CALLBACK(gtk_main_quit), NULL);
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g_signal_connect(gl, "configure-event",
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G_CALLBACK(eventConfigure), NULL);
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g_signal_connect(gl, "expose-event",
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G_CALLBACK(eventExpose), NULL);
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gtk_widget_show_all(window);
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gtk_main();
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return 0;
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}
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