lg_shader_progs.h

/*
 *      LibGame - Copyright (C) Emmanuel Thomas-Maurin 2011-2026
 *      All rights reserved
 */
 
#ifndef LG_SHADER_PROGS_H
#define LG_SHADER_PROGS_H
 
#define LG_INVALID_SHADER_PROG_ID       500000
 
typedef struct {
        unsigned int    id;
} LG_ShaderProg;
 
/* Uniform locations */
typedef struct {
        int     world_m;
        int     view_m;
        int     proj_m;
        int     view_proj_m;
        int     model_view_m;           /* Or world_view_m */
        int     model_view_proj_m;      /* Or world_view_proj_m or MVP_matrix */
        int     texcoords;
        int     light_type;
        int     light_pos;
        int     light_dir;
        int     light_color;
        int     luminosity_k;
        int     grid_half_size;
        int     grid_scaling;
} LG_ShaderULocs;
 
/* Vertex Attrib Pointer params */
typedef struct {
        int32_t         index;
        const char      *attrib_name;
        uint32_t        num_components;                 /* 1 to 4 */
        int32_t         type;                           /* One of GL_BYTE, GL_UNSIGNED_BYTE, GL_SHORT, GL_UNSIGNED_SHORT, GL_FIXED, GL_FLOAT */
        zboolean        do_normalize;
        size_t          stride;                         /* Byte offset between consecutive generic vertex attributes */
        void            *first_component_offset;        /* For instance: offsetof(Vertex_uv_n, u) */
} LG_VAP_params;
 
/* GL_VERTEX_SHADER, GL_FRAGMENT_SHADER, or GL_GEOMETRY_SHADER_OES */
typedef struct{
        int             type;
        const char      *string;
} Shader_Type_String;
 
#define VAP_END         {-1, NULL, 0, 0, 0, 0, NULL}
 
LG_ShaderProg   LG_ShaderProg_create(const char **, const char **, const char **, LG_VAP_params *);
 
void            LG_ShaderProg_delete(LG_ShaderProg *);
 
void            LG_ShaderProg_use(LG_ShaderProg *, zboolean);
 
char            *LG_ShaderProg_load_src_from_file(const char *);
 
int             LG_ShaderProg_get_attrib_loc(LG_ShaderProg *, const char *);
 
int             LG_ShaderProg_get_uniform_loc(LG_ShaderProg *, const char *);
 
uint32_t        lg_compile_shader(int, const char **);
 
void            lg_shader_info_log(uint32_t);
 
void            lg_shader_program_info_log(uint32_t);
 
const char      *lg_shader_get_string_from_type(int);
 
#endif /* LG_SHADER_PROGS_H */