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/**
* @brief Drawing shapes for UI or other reasons in screenspace
*/
#pragma once
#include "colours.h"
#include "darray.h"
#include "defines.h"
#include "render_types.h"
/** A draw_cmd packet for rendering a rectangle */
struct draw_rect {
i32 x, y; // signed ints so we can draw things offscreen (e.g. a window half inside the viewport)
u32 width, height;
rgba colour;
// TODO: border colour, gradients
};
/** A draw_cmd packet for rendering a circle */
struct draw_circle {
i32 x, y;
f32 radius;
rgba colour;
};
/** @brief Tagged union that represents a UI shape to be drawn. */
typedef struct draw_cmd {
enum { DRAW_RECT, CIRCLE } draw_cmd_type;
union {
struct draw_rect rect;
struct draw_circle circle;
};
} draw_cmd;
KITC_DECL_TYPED_ARRAY(draw_cmd)
typedef struct screenspace_state {
u32 rect_vbo;
u32 rect_vao;
// shader rect_shader;
draw_cmd_darray* draw_cmd_buf;
} screenspace_state;
// --- Lifecycle
bool screenspace_2d_init(screenspace_state* state);
void screenspace_2d_shutdown(screenspace_state* state);
/** Drains the draw_cmd buffer and emits draw calls to render each one */
void screenspace_2d_render(screenspace_state* state);
struct core;
/** @brief Draw a rectangle to the screen. (0,0) is the bottom-left */
void draw_rectangle(struct core* core, rgba colour, i32 x, i32 y, u32 width, u32 height);
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