townengine/src/rendering.h

#ifndef RENDERING_H
#define RENDERING_H

#include "util.h"

#include <SDL2/SDL.h>

#include <stdbool.h>

typedef struct push_sprite_args {
    char *path;
    t_color color;
    double rotation;
    SDL_BlendMode blend_mode;
    bool flip_x;
    bool flip_y;
} t_push_sprite_args;

/* clears all render queues */
void render_queue_clear(void);

/* pushes a sprite onto the sprite render queue */
/* this is a simplified version of push_sprite_ex for the most common case. */
/* it assumes you want no color modulation, no rotation, no flip, layer 0, and alpha blending */
void push_sprite(char *path, t_frect rect);

/* pushes a sprite onto the sprite render queue */
/* note that if args is zeroed out, the color will be transparent black */
void push_sprite_ex(t_frect rect, t_push_sprite_args args);

/* pushes a filled rectangle onto the rectangle render queue */
void push_rectangle(t_frect rect, t_color color);

/* pushes a filled circle onto the circle render queue */
void push_circle(t_fvec2 position, float radius, t_color color);

/* pushes a textured 3d triangle onto the render queue */
/* vertices are in absolute coordinates, relative to world origin */
/* texture coordinates are in pixels */
void unfurl_triangle(const char *path,
                     t_fvec3 v0,
                     t_fvec3 v1,
                     t_fvec3 v2,
                     t_shvec2 uv0,
                     t_shvec2 uv1,
                     t_shvec2 uv2);

/* pushes a colored textured 3d triangle onto the render queue */
// void unfurl_colored_triangle(const char *path,
//                              t_fvec3 v0,
//                              t_fvec3 v1,
//                              t_fvec3 v2,
//                              t_shvec2 uv0,
//                              t_shvec2 uv1,
//                              t_shvec2 uv2,
//                              t_color c0,
//                              t_color c1,
//                              t_color c2);

// TODO:
// http://www.lighthouse3d.com/opengl/billboarding/index.php?billCheat2
// void unfurl_billboard(const char *path,
//                      t_fvec3 position,
//                      t_fvec2 scaling,
//                      t_frect uvs);

/* renders the background, then the primitives in all render queues */
void render(void);

#endif