#include "../../HEADERS/EFFECTS/Screen.h"

extern "C" {
#include "../../GLES_3_1_compatibility.h"
#include <glut.h>
}

#include <string>
#include "../../HEADERS/UTILS/ShaderMaker.h"

Screen::Screen(int left, int top, int width, int height)
	: PseudoContext{ left, top, width, height } 
{
	glGenVertexArrays(1, &quadVAO);
	glBindVertexArray(quadVAO);
	glGenBuffers(1, &vertVBO);
	glBindBuffer(GL_ARRAY_BUFFER, vertVBO);
	glBufferData(GL_ARRAY_BUFFER, sizeof(quadVerts), quadVerts, GL_STATIC_DRAW);
	
	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float)/**/,(void*) 0);
	glEnableVertexAttribArray(0);
	string root = "C:\\Users\\BoBoBoat\\Desktop\\SCUOLA\\CGI\\GL_STUFF\\GL_STUFF\\SOURCES\\EFFECTS\\SCREEN";
	string vertSh = root + "\\vertexShader_2.glsl";
	string fragSh = root + "\\fragmentShader_2.glsl";
	program2 = ShaderMaker::createProgram(&vertSh[0], &fragSh[0]);
	shaderTexId = glGetUniformLocation(program2, "inTex");
}

void Screen::setInputTexture(GLuint inputTex) {
	inputTexture = inputTex;
}

void Screen::draw() {
	glBindFramebuffer(GL_FRAMEBUFFER, 0);
	//glViewport(left, top, width, height);
	//gluOrtho2D(0, width, height, 0);
	glClearColor(0.0, 0.0, 0.0, 0.0);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glUseProgram(program2);

	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, inputTexture);
	glUniform1i(shaderTexId, 0);
	glBindVertexArray(quadVAO);
	glDrawArrays(GL_TRIANGLES, 0, 6);
	glBindVertexArray(0);
	glutSwapBuffers();
}