lg_mesh_lines.h

/*
 *      LibGame - Copyright (C) Emmanuel Thomas-Maurin 2011-2026
 *      All rights reserved
 */
 
#ifndef LG_MESH_LINES_H
#define LG_MESH_LINES_H
 
#define MESHLINE_N_SEG_MAX      1024
 
/*
 * Hexagon-based mesh line
 *
 *      base
 *
 *        x  x (i = 1)
 *      x      x (i = 0)
 *        x  x
 *
 *      n_seg = 2
 *
 *            x  x
 *          x/  /  x
 *         /x  x  /
 *        x/  /  x
 *       /x  x  /
 *      x      x
 *        x  x
 *
 *      n_seg = 3
 *
 *        x  x----x----x----x
 *      x      x----x----x----x
 *        x  x----x----x----x
 *
 */
typedef struct {
        /* Unused - useful ?
        vec3_t  v1;
        vec3_t  v2;
        */
        uint32_t        n_seg;
        float           line_width;
        LG_Color_u      c1;             /* Color of odd segments */
        LG_Color_u      c2;             /* Color of even segments */
        Vertex_rgba     *vbo_data;
        uint32_t        vbo_size;
        LG_VAO          vao;
        LG_VBO          vbo;
        LG_ShaderProg   shader;
} LG_MeshLine;
 
typedef struct {
        LG_MeshLine     meshline;
        /* Unused - useful ?
        uint16_t        half_grid_width;
        float           scaling;
        */
        LG_Color_u      color;
        vec3_t          *v3_grid;
        int             n_vertices;
} LG_MeshLine_Grid;
 
LG_MeshLine             lg_meshline_new(vec3_t, vec3_t, int, float, LG_Color_u, LG_Color_u, zboolean *);
 
int                     lg_meshline_set_data(LG_MeshLine *, vec3_t, vec3_t, LG_Color_u, LG_Color_u);
 
int                     lg_meshline_render(LG_MeshLine *, mat4_t *);
 
void                    lg_meshline_free(LG_MeshLine *);
 
LG_MeshLine_Grid        lg_meshline_grid_new(uint16_t, float, LG_Color_u, uint32_t, float, zboolean *);
 
int                     lg_meshline_grid_render(LG_MeshLine_Grid *, mat4_t *);
 
void                    lg_meshline_grid_free(LG_MeshLine_Grid *);
 
#endif /* LG_MESH_LINES_H */