lg_shader_progs.h

/*
 *      LibGame - Copyright (C) Emmanuel Thomas-Maurin 2011-2025
 *      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;
} 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;
 
#define VAP_END         {-1, NULL, 0, 0, 0, 0, NULL}
 
#define CHECK_GL_E      lg_check_gl_errors(lg_log_time(), __FILE__ , __LINE__, __func__)
 
#define CHECK_GL_E_2    {if (lg_check_gl_errors(lg_log_time(), __FILE__, __LINE__, __func__) != LG_OK) exit(-1);}
 
#define STH_WRONG_HERE \
        { \
                static int i = 0; \
                if (i == 0) { \
                        INFO_OUT("VARO TÄSSÄ\n%s [%s: %d] %s(): jotain pitää korjata\n", UTF8_RW_ROUNDED_ARROW, __FILE__, __LINE__, __func__) \
                        i++; \
                } \
        }
 
LG_ShaderProg   LG_ShaderProg_create(const char **, const char **, LG_VAP_params *);
 
void            LG_ShaderProg_delete(LG_ShaderProg *);
 
void            LG_ShaderProg_use(LG_ShaderProg *, zboolean);
 
int             LG_ShaderProg_get_attrib_loc(LG_ShaderProg *, const char *);
 
int             LG_ShaderProg_get_uniform_loc(LG_ShaderProg *, const char *);
 
uint32_t        lg_load_shader(int, const char **);
 
int             lg_check_gl_errors(long long, const char *, int, const char *);
 
void            lg_shader_info_log(uint32_t);
 
#endif /* LG_SHADER_PROGS_H */