scufpong/subprojects/scufeng-x86_64/include/scufeng/Mesh.h

#ifndef SCUFENG_SHAPE_H_
#define SCUFENG_SHAPE_H_

#include <stdbool.h>
#include <stddef.h>

#include "cglm/types.h"
#include "scufcont/DString.h"
#include "scufeng/engine.h"

#define SEMesh_string_c_str(mesh_ptr) SCDString_c_str(&mesh_ptr->string.text)

typedef enum {
    SE_TRIANGLES,
    SE_TRIANGLE_STRIP,
    SE_TRIANGLE_FAN,
    SE_LINES,
    SE_LINE_STRIP
} SEDrawMode;

typedef struct {
    vec3 pos;
    vec3 scale;
    vec3 rotation;
} SETransform;

typedef struct {
    float pos[3];
    float tex_coords[2];
} SEVertex;

typedef enum {
    SE_MESH_COLOR,
    SE_MESH_TEXTURE,
    SE_MESH_STRING
} SEMeshType;

typedef struct {
    unsigned int id;
    float w;
    float h;
} SEMeshTexture;

typedef struct {
    SEMeshTexture texture;
    SCDString text;
    vec3 color;
} SEMeshString;

typedef struct {
    unsigned int vao;
    unsigned int vbo;
    size_t verts_n;
    int draw_mode;

    SETransform transform;

    SEMeshType type;
    union {
        SEMeshString string;
        SEMeshTexture texture;
        vec4 color;
    };
} SEMesh;

void SEMesh_free(SEMesh *const mesh);
void SEMesh_set_draw_mode(SEMesh *mesh, const SEDrawMode mode);
void SEMesh_render(const SEMesh *const mesh);
void SEMesh_color_set(SEMesh *const mesh, const vec4 color);
void SEMesh_rect_dims_get(const SEMesh *const mesh, vec2 dims);
void SEMesh_scale_set_to_texture_size(SEMesh *const mesh);

/**
  Set x or y to 0 to automatically calculate that value based on the
  w/h ratio of the rect's texture. Setting both to 0 will result in
  scale being { 0, 0 }.
*/
void SEMesh_rect_textured_scale_set(SEMesh *const mesh, float x, float y);

void SEMesh_textured_replace(
    SEMesh *const mesh,
    const unsigned int id,
    const float w,
    const float h
);
void SEMesh_line_segment_coords_set(SEMesh *const mesh, const vec2 a, const vec2 b);
SEMesh SEMesh_line_segment_color_alloc(const vec2 a, const vec2 b, const vec4 color);
void SEMesh_bbox_render_2d(const SEMesh *const mesh);
void SEMesh_bbox_get_2d(
    const SEMesh *const mesh,
    float *const left,
    float *const top,
    float *const right,
    float *const bottom
);

/**
  @param bbox Returns the bbox in order: { left, top, right, bottom }.
*/
void SEMesh_bbox_get_2d_v(const SEMesh *const mesh, vec4 bbox);

bool SEMesh_rect_is_pos_inside(const SEMesh *const mesh, const float x, const float y);
SEMesh SEMesh_rect_color_alloc(vec4 color);

/**
  @return SE_OUT_OF_MEMORY
  @return SE_SUCCESS
*/
SEResult SEMesh_string_alloc(
    SEMesh *const mesh,
    const char *text,
    const size_t text_len,
    const vec3 color
);

/**
  @return SE_OUT_OF_MEMORY
  @return SE_SUCCESS
*/
SEResult SEMesh_string_text_replace(
    SEMesh *const mesh,
    const char *text,
    const size_t text_len,
    const vec3 color
);

void SEMesh_render_multiple_2d(SEMesh *const *const meshes, const size_t meshes_n);

#endif // SCUFENG_SHAPE_H_