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/*
* Isometric rendering engine.
*/
#pragma once
#include <stdbool.h>
#include <stdint.h>
typedef struct IsoGfx IsoGfx;
/// Tile handle.
typedef uint16_t Tile;
/// Colour channel.
typedef uint8_t Channel;
typedef struct Pixel {
Channel r, g, b, a;
} Pixel;
typedef enum TileDescType {
TileFromColour,
TileFromFile,
TileFromMemory,
} TileDescType;
typedef struct TileDesc {
TileDescType type;
int width; /// Tile width in pixels.
int height; /// Tile height in pixels.
union {
Pixel colour; /// Constant colour tile.
struct {
const char* path;
} file;
struct {
const uint8_t* data; /// sizeof(Pixel) * width * height
} mem;
};
} TileDesc;
typedef struct WorldDesc {
int tile_width; /// Base tile width in pixels.
int tile_height; /// Base tile height in pixels.
int world_width; /// World width in tiles.
int world_height; /// World height in tiles.
int max_num_tiles; /// 0 for an implementation-defined default.
} WorldDesc;
typedef struct IsoGfxDesc {
int screen_width; /// Screen width in pixels.
int screen_height; /// Screen height in pixels.
} IsoGfxDesc;
/// Create a new isometric graphics engine.
IsoGfx* isogfx_new(const IsoGfxDesc*);
/// Destroy the isometric graphics engine.
void isogfx_del(IsoGfx**);
/// Create an empty world.
bool isogfx_make_world(IsoGfx*, const WorldDesc*);
/// Load a world from a tile map (.TM) file.
bool isogfx_load_world(IsoGfx*, const char* filepath);
/// Return the world's width.
int isogfx_world_width(const IsoGfx*);
/// Return the world's height.
int isogfx_world_height(const IsoGfx*);
/// Create a new tile.
Tile isogfx_make_tile(IsoGfx*, const TileDesc*);
/// Set the tile at position (x,y).
void isogfx_set_tile(IsoGfx*, int x, int y, Tile);
/// Set the tiles in positions in the range (x0,y0) - (x1,y1).
void isogfx_set_tiles(IsoGfx*, int x0, int y0, int x1, int y1, Tile);
/// Translate Cartesian to isometric coordinates.
void isogfx_pick_tile(
const IsoGfx*, double xcart, double ycart, int* xiso, int* yiso);
/// Render the world.
void isogfx_render(IsoGfx*);
/// Draw/overlay a tile at position (x,y).
///
/// This function just renders a tile at position (x,y) and should be called
/// after isogfx_render() to obtain the correct result. To set the tile at
/// position (x,y) instead, use isogfx_set_tile().
void isogfx_draw_tile(IsoGfx*, int x, int y, Tile);
/// Return a pointer to the internal colour buffer.
///
/// Call after each call to isogfx_render() to retrieve the render output.
const Pixel* isogfx_get_screen_buffer(const IsoGfx*);
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