#include <GL/glew.h>
#include "ImageViewer.hpp"

namespace MC::Util {

void ImageViewer::render() {
    m_program.bind();
    m_texture.bind();
    m_mesh.bind();
    glDrawElements(GL_TRIANGLES, m_mesh.size(), GL_UNSIGNED_INT, nullptr);
    m_mesh.unbind();
    m_texture.unbind();
    m_program.unbind();
}

GFX::Mesh ImageViewer::create_default_mesh() {
    return {{
        std::vector<Vector<3>>{
            {0.0f,  1.0f, 0.0f},   // top left
            {0.0f, 0.0f, 0.0f},   // bottom left
            {1.0f, 0.0f, 0.0f},   // bottom right
            {1.0f,  0.0f, 0.0f } // top right
        },
        std::vector<Vector<2>>{
            {1.0f, 1.0f},
            {1.0f, 0.0f,},
            {0.0f, 0.0f},
            {0.0f, 1.0f},
        },
    }, {0, 1, 2, 0, 2, 3}};
}

const char* ImageViewer::vertex = R"v(
#version 330 core

layout (location = 0) in vec3 position;
layout (location = 1) in vec2 tex_coord;

out vec2 frag_tex_coord;

void main() {
    gl_Position = vec4(position, 1.0);
    frag_tex_coord = tex_coord;
})v";

const char* ImageViewer::fragment = R"f(
#version 330 core

uniform sampler2D image;

in vec2 frag_tex_coord;
out vec4 color;

void main() {
    //color = texture(image, frag_tex_coord);
    color = vec4(0.3, 0.5, 1.0, 1.0);
})f";

}