ogl_shading.h

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/* This file is part of the 'atomes' software
 
'atomes' is free software: you can redistribute it and/or modify it under the terms
of the GNU Affero General Public License as published by the Free Software Foundation,
either version 3 of the License, or (at your option) any later version.
 
'atomes' 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 Affero General Public License along with 'atomes'.
If not, see <https://www.gnu.org/licenses/>
 
Copyright (C) 2022-2026 by CNRS and University of Strasbourg */

 
/*
* This header file: 'ogl_shading.h'
*
* Contains:
 
 - Variable declarations related to GLSL programs
 - Data structure declarations related to GLSL programs
 
*/
 
#ifndef OGL_SHADING_H_
#define OGL_SHADING_H_

enum glsl_styles {
  GLSL_POINTS    = 0, 
  GLSL_SPHERES   = 1, 
  GLSL_LINES     = 2, 
  GLSL_CYLINDERS = 3, 
  GLSL_CAPS      = 4, 
  GLSL_POLYEDRA  = 5, 
  GLSL_STRING    = 6, 
  GLSL_LIGHT     = 7, 
  GLSL_BACK      = 8  
};
 
#define POLY_BUFF_SIZE 10  // p(x,y,z), n(x,y,z), color (r,g,b,a)
#define LINE_BUFF_SIZE  7  // p(x,y,z), color (r,g,b,a)
#define CYLI_BUFF_SIZE 13  // p(x,y,z), length, rad, quat(w,x,y,z), color (r,g,b,a)
#define CAPS_BUFF_SIZE 12  // p(x,y,z), rad, quat(w,x,y,z), color (r,g,b,a)
#define ATOM_BUFF_SIZE  8  // p(x,y,z), rad, color (r,g,b,a)
#define CHAR_BUFF_SIZE  4  // p(x,y), t(x,y)
 
// Points
extern const GLchar * point_vertex;
extern const GLchar * point_color;
 
// Basic lines
extern const GLchar * line_vertex;
extern const GLchar * line_color;
extern const GLchar * line_stipple;
extern const GLchar * line_stipple_color;
extern const GLchar * angle_vertex;
extern const GLchar * angle_stipple;
extern const GLchar * angle_color;
 
extern const GLchar * angstrom_vertex;
extern const GLchar * degree_vertex;
 
// Triangles: Multiple lights + Materials + Transparency shaders
extern const GLchar * full_vertex;
extern const GLchar * full_color;
extern const GLchar * full_color_ray;
 
// Sphere
extern const GLchar * sphere_vertex;
extern const GLchar * sphere_vertex_ray;
// Cylinder and caps
extern const GLchar * cylinder_vertex;
extern const GLchar * cylinder_vertex_ray;
extern const GLchar * cone_vertex;
extern const GLchar * cone_vertex_ray;
extern const GLchar * cap_vertex;
extern const GLchar * cap_vertex_ray;
 
extern const GLchar * string_vertex;
extern const GLchar * string_color;
extern const GLchar * string_color_2d;
 
extern const GLchar * background_vertex;
extern const GLchar * background_linear;
extern const GLchar * background_circular;

typedef struct object_3d object_3d;
struct object_3d
{
  int quality;             
  int num_vertices;        
  int vert_buffer_size;    
  float * vertices;        
  int num_indices;         
  int ind_buffer_size;     
  int * indices;           
  int num_instances;       
  int inst_buffer_size;    
  float * instances;       
  GLuint texture;          
  float shift[4];          
};

typedef struct glsl_program glsl_program;
struct glsl_program
{
  int id;                  
  int object;              
  GLuint vertex_shader;    
  GLuint geometry_shader;  
  GLuint fragment_shader;  
  GLenum vert_type;        
  int draw_type;           
  gboolean draw_instanced; 
  GLuint vao;              
  GLuint * vbo;            
  GLuint * array_pointer;  
  GLuint * uniform_loc;    
  GLuint * light_uniform;  
  object_3d * obj;         
  float line_width;        
  ColRGBA * col;           
};
 
extern void allocate_instances (object_3d * object);
#endif