Add opengl shader program class

include/shimatta-opengl-program.h

@@ -0,0 +1,75 @@
+/*
+ * This file is part of Shimatta OpenGL.
+ *
+* Foobar is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* Shimatta OpenGL 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 GtkGraphView. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <glib.h>
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define SHIMATTA_TYPE_OPENGL_PROGRAM (shimatta_opengl_program_get_type())
+
+G_DECLARE_FINAL_TYPE(ShimattaOpenglProgram, shimatta_opengl_program, SHIMATTA, OPENGL_PROGRAM, GObject);
+
+/**
+ * @brief generate a new shader program using the source code for the shaders
+ * @param vertex_shader Vertex shader source code
+ * @param geometry_shader Geometry shader source code
+ * @param fragment_shader Fragement shader source code
+ * @return New shader program
+ */
+ShimattaOpenglProgram *shimatta_opengl_program_new_from_data(const char *vertex_shader,
+                                                                const char *geometry_shader,
+                                                                const char *fragment_shader);
+
+/**
+ * @brief shimatta_opengl_program_new_from_file
+ * @param vertex_shader Source file for the vertex shader
+ * @param geometry_shader Source file for the geometry shader
+ * @param fragment_shader source file for the fragment shader
+ * @return New shader program
+ * @note The files have tobe accessible when calling @ref shimatta_opengl_program_compile
+ */
+ShimattaOpenglProgram *shimatta_opengl_program_new_from_file(const char *vertex_shader,
+                                                const char *geometry_shader,
+                                                const char *fragment_shader);
+
+/**
+ * @brief Compile the OpenGL Program
+ * @param program Shader Program
+ * @param error_text Error message from compilation. May be NULL.
+ * @param error_text_size Size in bytes of the error_text buffer. May be 0.
+ * @return 0 if successful. If Error error text will hold the error
+ */
+int shimatta_opengl_program_compile(ShimattaOpenglProgram *program, char *error_text, size_t error_text_size);
+
+/**
+ * @brief Active shader program.
+ *
+ * The activation only works, if the program is compiled successfully
+ *
+ * @param program Shader program
+ * @return 0 if successful
+ */
+int shimatta_opengl_program_use(ShimattaOpenglProgram *program);
+
+/**
+ * @brief Check if shader program is compiled
+ * @param program Shader program
+ * @return true if successfully built
+ */
+gboolean shimatta_opengl_program_is_compiled(ShimattaOpenglProgram *program);
+
+G_END_DECLS

src/shimatta-opengl-program.c

@@ -0,0 +1,75 @@
+/*
+ * This file is part of Shimatta OpenGL.
+ *
+* Foobar is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* Shimatta OpenGL 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 GtkGraphView. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <shimatta-opengl-program.h>
+#include <epoxy/gl.h>
+
+struct _ShimattaOpenglProgram {
+	GObject super;
+};
+
+typedef struct {
+	GLint shader_id;
+	gboolean compiled;
+	char *fragment_file;
+	char *vertex_file;
+	char *geometry_file;
+	char *fragment_src;
+	char *vertex_src;
+	char *geometry_src;
+
+} ShimattaOpenglProgramPrivate;
+
+G_DEFINE_TYPE_WITH_PRIVATE(ShimattaOpenglProgram, shimatta_opengl_program, G_TYPE_OBJECT);
+
+static void shimatta_opengl_program_class_init(ShimattaOpenglProgramClass *klass)
+{
+	(void)klass;
+
+	return;
+}
+
+static void shimatta_opengl_program_init(ShimattaOpenglProgram *self)
+{
+	ShimattaOpenglProgramPrivate *priv;
+
+	priv = shimatta_opengl_program_get_instance_private(self);
+
+	priv->shader_id = 0;
+	priv->vertex_src = NULL;
+	priv->vertex_file = NULL;
+	priv->fragment_src = NULL;
+	priv->geometry_src = NULL;
+	priv->fragment_file = NULL;
+	priv->geometry_file = NULL;
+	priv->compiled = false;
+}
+
+ShimattaOpenglProgram *shimatta_opengl_program_new_from_data(const char *vertex_shader, const char *geometry_shader,
+								const char *fragment_shader)
+{
+	ShimattaOpenglProgram *ret;
+	ShimattaOpenglProgramPrivate *priv;
+
+	ret = g_object_new(SHIMATTA_TYPE_OPENGL_PROGRAM, NULL);
+	priv = shimatta_opengl_program_get_instance_private(ret);
+
+	priv->fragment_src = g_strdup(fragment_shader);
+	priv->geometry_src = g_strdup(geometry_shader);
+	priv->vertex_src= g_strdup(vertex_shader);
+
+	return ret;
+}