#include "sprite.h"
#include "shader.h"

struct sprite_renderer init_renderer(u32 shader)
{
	struct sprite_renderer renderer = {0};
	renderer.shader = shader;
	f32 vertices[] = {
		0.0f, 0.0f, 0.0f, 0.0f,
		1.0f, 0.0f, 1.0f, 0.0f,
		0.0f, 1.0f, 0.0f, 1.0f,

		1.0f, 0.0f, 1.0f, 0.0f,
		1.0f, 1.0f, 1.0f, 1.0f,
		0.0f, 1.0f, 0.0f, 1.0f
	};
	u32 vao, vbo;
	glGenVertexArrays(1, &vao);
	glGenBuffers(1, &vbo);
	glBindBuffer(GL_ARRAY_BUFFER, vbo);
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
	glBindVertexArray(vao);
	glEnableVertexAttribArray(0);
	glVertexAttribPointer(0, 4, GL_FLOAT, 0, 4 * sizeof(f32), 0);
	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glBindVertexArray(0);
	renderer.vao = vao;
	return renderer;
}

void render_sprite(struct sprite_renderer renderer, u32 texture, v2 pos, v2 size, f32 rotate, v3 color)
{
	glUseProgram(renderer.shader);
	mat model = mat_identity;
	model = scale_mat(model, (v3){size.x, size.y, 0.0f});
	model = translate_mat(model, (v3){-0.5f * size.x, -0.5f * size.y, 0.0f});
	model = rotate_mat(model, (v3){0.0f, 0.0f, rotate});
	model = translate_mat(model, (v3){0.5f * size.x, 0.5f * size.y, 0.0f});
	model = translate_mat(model, (v3){pos.x, pos.y, 0.0f});
	uniform_mat(renderer.shader, "model", model);
	uniform_v3(renderer.shader, "color", color);
	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, texture);
	glBindVertexArray(renderer.vao);
	glDrawArrays(GL_TRIANGLES, 0, 6);
	glBindVertexArray(0);
	glUseProgram(0);
}