object3D.cpp

// Custom Libraries
#include "object3D.h"

// Standrad Libraries

Object3D::Object3D() : Object()
{
	this->emit_mode = 0;
	this->draw_mode = 0;

	this->attribute_v_coord = 0;
	this->attribute_v_colours = 1;
	this->attribute_v_normal = 2;
	this->attribute_v_uvs = 3;

	this->vertexBufferObj = NULL;
	this->indexBufferObj = NULL;
	this->colourBufferObj = NULL;
	this->normalBufferObj = NULL;
	this->uvBufferObj = NULL;
}

Object3D::~Object3D()
{
	this->vertexBufferObj = NULL;
	this->indexBufferObj = NULL;
	this->colourBufferObj = NULL;
	this->normalBufferObj = NULL;
	this->uvBufferObj = NULL;

	this->vertex_positions.clear();
	this->indices.clear();
	this->vertex_colours.clear();
	this->vertex_normals.clear();
	this->texture_coords.clear();
}

void Object3D::makeObject()
{
	/* Create the vertex buffer for the object */
	glGenBuffers(1, &vertexBufferObj);
	glBindBuffer(GL_ARRAY_BUFFER, vertexBufferObj);
	glBufferData(GL_ARRAY_BUFFER, sizeof(glm::vec3) * this->vertex_positions.size(), &this->vertex_positions[0], GL_STATIC_DRAW);
	glBindBuffer(GL_ARRAY_BUFFER, 0);

	/* Create the colours buffer for the object */
	glGenBuffers(1, &colourBufferObj);
	glBindBuffer(GL_ARRAY_BUFFER, colourBufferObj);
	glBufferData(GL_ARRAY_BUFFER, sizeof(glm::vec4) * this->vertex_colours.size(), &this->vertex_colours[0], GL_STATIC_DRAW);
	glBindBuffer(GL_ARRAY_BUFFER, 0);

	/* Create the normals  buffer for the object */
	glGenBuffers(1, &normalBufferObj);
	glBindBuffer(GL_ARRAY_BUFFER, normalBufferObj);
	glBufferData(GL_ARRAY_BUFFER, sizeof(glm::vec3) * this->vertex_normals.size(), &this->vertex_normals[0], GL_STATIC_DRAW);
	glBindBuffer(GL_ARRAY_BUFFER, 0);

	/* Create the texture coordinate buffer for the object */
	glGenBuffers(1, &uvBufferObj);
	glBindBuffer(GL_ARRAY_BUFFER, uvBufferObj);
	glBufferData(GL_ARRAY_BUFFER, sizeof(glm::vec2) * this->texture_coords.size(), &this->texture_coords[0], GL_STATIC_DRAW);
	glBindBuffer(GL_ARRAY_BUFFER, 0);
}

void Object3D::drawObject(bool clockwise)
{
	/* Bind object vertices. Note that this is in attribute index attribute_v_coord */
	glBindBuffer(GL_ARRAY_BUFFER, vertexBufferObj);
	glEnableVertexAttribArray(attribute_v_coord);
	glVertexAttribPointer(attribute_v_coord, 3, GL_FLOAT, GL_FALSE, 0, 0);

	/* Bind object colours. Note that this is in attribute index attribute_v_colours */
	glBindBuffer(GL_ARRAY_BUFFER, colourBufferObj);
	glEnableVertexAttribArray(attribute_v_colours);
	glVertexAttribPointer(attribute_v_colours, 4, GL_FLOAT, GL_FALSE, 0, 0);

	/* Bind object normals. Note that this is in attribute index attribute_v_normal */
	glEnableVertexAttribArray(attribute_v_normal);
	glBindBuffer(GL_ARRAY_BUFFER, normalBufferObj);
	glVertexAttribPointer(attribute_v_normal, 3, GL_FLOAT, GL_FALSE, 0, 0);

	/* Bind object texture coordinates. Note that this is in attribute index attribute_v_uvs */
	glEnableVertexAttribArray(attribute_v_uvs);
	glBindBuffer(GL_ARRAY_BUFFER, uvBufferObj);
	glVertexAttribPointer(attribute_v_uvs, 2, GL_FLOAT, GL_FALSE, 0, 0);

	// Clockwise triangle winding
	glFrontFace((clockwise * GL_CW) + (!clockwise * GL_CCW));

	glPointSize(5.f);

	switch (this->draw_mode) {
	case 0:
	fill:
		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
		break;

	case 1:
		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
		break;

	case 2:
		glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
		break;

	default:
		std::cerr << "Draw mode only has 4 modes ranging from 0-3 not " << this->draw_mode << std::endl;
		goto fill;
	}
}

void Object3D::setVertexColour(glm::vec4 rgba)
{
	for (auto& element : this->vertex_colours) {
		element = rgba;
	}
}