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[grits] / examples / sorting / sort.c

diff --git a/examples/sorting/sort.c b/examples/sorting/sort.c
index 7cb54c5aaea033cfeebce8f69df41d27c068d150..839c7c55170d48a5a46f4a97618ab93563474bb7 100644 (file)
--- a/examples/sorting/sort.c
+++ b/examples/sorting/sort.c
@@ -1,3 +1,20 @@
+/*
+ * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #define GL_GLEXT_PROTOTYPES
 #include <gtk/gtk.h>
 #include <gtk/gtkgl.h>
@@ -264,6 +281,56 @@ static guint load_tex(gchar *filename)
        return tex;
 }
 
+gchar *gl_program_log(guint program, int *_len)
+{
+       gchar *buf = NULL;
+       int len = 0;
+       glGetProgramiv(program, GL_INFO_LOG_LENGTH, &len);
+       if (len > 0) {
+               buf = g_malloc(len);
+               glGetProgramInfoLog(program, len, &len, buf);
+       }
+       if (_len)
+               *_len = len;
+       return buf;
+}
+
+static void load_shader(gchar *filename)
+{
+       gchar *source;
+       gboolean status = g_file_get_contents(filename, &source, NULL, NULL);
+       if (!status)
+               g_error("Failed to load shader");
+
+       guint program = glCreateProgram();
+       if (!program)
+               g_error("Error creating program");
+
+       guint shader = glCreateShader(GL_VERTEX_SHADER_ARB);
+       if (!shader)
+               g_error("Error creating shader");
+
+       glShaderSource(shader, 1, (const gchar**)&source, NULL);
+       if (glGetError())
+               g_error("Error setting shader source");
+
+       glCompileShader(shader);
+       if (glGetError())
+               g_error("Error compiling shader");
+
+       glAttachShader(program, shader);
+       if (glGetError())
+               g_error("Error attaching shader");
+
+       glLinkProgram(program);
+       if (glGetError())
+               g_error("Error linking program");
+
+       glUseProgram(program);
+       if (glGetError())
+               g_error("Error using program:\n%s", gl_program_log(program, NULL));
+}
+
 int main(int argc, char **argv)
 {
        gtk_init(&argc, &argv);
@@ -289,6 +356,9 @@ int main(int argc, char **argv)
        /* Load texture */
        tex = load_tex("flag.png");
 
+       /* Load shader */
+       load_shader("sort.glsl");
+
        gtk_main();
 
        gdk_gl_drawable_gl_end(gldrawable);