#pragma once

#if defined (_WIN32)
	#include <SDL.h>
#else
	#include <SDL2/SDL.h>
#endif
#include <GL/glew.h>
#include <glm/glm.hpp>

#include "camera.h"
#include "entity.h"
#include "util.h"
#include "shader_program.h"


struct SDL_Handles
{
	SDL_Window *window;
	SDL_GLContext glContext;
	SDL_DisplayMode currentDisplayMode;
};

struct point_light
{
	uint light_ID;
	glm::vec3 position;
	glm::vec3 color;
	float intensity;
};

// NOTE: array of entities rendered with the same shader program
struct render_group
{
	entity* entities;
	uint entity_count;

	shader_program shader;
};

struct render_state
{
	glm::vec2 viewport_dims;
	bool is_debug_draw;
	SDL_Handles handles;
	camera cam;
	util_RGBA clear_col;

	render_group** render_groups;
	uint render_group_count;

	shader_program* default_shader;

	point_light* lights;
	uint num_lights;
	uint max_lights;
};

render_state*
renInit(const char* title = "Tangerine",
		glm::vec2 viewport_dims = glm::vec2(1280, 720));

void renShutdown(render_state* rs);

render_group*
renAllocateGroup(uint entity_count, shader_program shader);

void renRenderFrame(render_state* rs);