Add opengl shader program class

This commit is contained in:
Mario Hüttel 2020-06-24 23:43:13 +02:00
parent 184607618b
commit b855dcf0bc
2 changed files with 150 additions and 0 deletions

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/*
* 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

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/*
* 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;
}