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// ---------------------------------------------------------------------

// PGround Implementation

// ---------------------------------------------------------------------

#include "PTile.h"

// Use Core Structures / std namespaces

using namespace CoreStructures;

using namespace std;

// ---------------------------------------------------------------------

// PRIVATE

// ---------------------------------------------------------------------

// Precondition: n/a

// Postcondition: Shader loaded from file

void PTile::loadShader()

{

// Create Shader

GLSL_ERROR glsl_err = GLSLFactory::createShaderProgram(string("Resources\\shaders\\basic_texture.vs"), string("Resources\\Shaders\\basic_texture.fs"), &shader);

}

// Precondition: n/a

// Postcondition: Texture loaded from file

void PTile::loadTexture()

{

// Load Texture

texture = CGTextureLoader::loadTexture(wstring(L"Resources\\Textures\\ant.png"), CGTextureGenProperties(GL_LINEAR, GL_LINEAR, 2.0f, GL_REPEAT, GL_REPEAT, true));

}

// Precondition: n/a

// Postcondition: Vertex/Texture coords and indices setup

void PTile::setupVertexData()

{

// Setup of Vertex Data

vertices[0] = GUVector4(0.0, 0.0, 0.0);

vertices[1] = GUVector4(0.0, 0.0, 1.0);

vertices[2] = GUVector4(1.0, 0.0, 0.0);

vertices[3] = GUVector4(1.0, 0.0, 1.0);

// Setup of Texture Coordinate Data

texcoord[0] = GUVector2(0.0, 0.0);

texcoord[1] = GUVector2(0.0, 1.0);

texcoord[2] = GUVector2(1.0, 0.0);

texcoord[3] = GUVector2(1.0, 1.0);

// Setup of Index data

indices[0] = 2;

indices[1] = 0;

indices[2] = 1;

indices[3] = 2;

indices[4] = 1;

indices[5] = 3;

// Setup of Index data (for lines)

lineIndices[0] = 0;

lineIndices[1] = 1;

lineIndices[2] = 3;

lineIndices[3] = 2;

}

// Precondition: n/a

// Postcondition: VAO and VBOs setup

void PTile::setupVertexArrayObject()

{

// Setup VAO

glGenVertexArrays(1, &VAO_tile);

glBindVertexArray(VAO_tile);

// Setup VBO - Position

glGenBuffers(1, &VBO_position);

glBindBuffer(GL_ARRAY_BUFFER, VBO_position);

glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, (const GLvoid*)0);

// Setup VBO - Texture Coordinates

glGenBuffers(1, &VBO_texture);

glBindBuffer(GL_ARRAY_BUFFER, VBO_texture);

glBufferData(GL_ARRAY_BUFFER, sizeof(texcoord), texcoord, GL_STATIC_DRAW);

glVertexAttribPointer(3, 2, GL_FLOAT, GL_TRUE, 0, (const GLvoid*)0);

// Enable VBOs

glEnableVertexAttribArray(0);

glEnableVertexAttribArray(3);

// Setup VBO - indicies

glGenBuffers(1, &VBO_index);

glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, VBO_index);

glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);

// Setup VBO - lineIndicies

glGenBuffers(1, &VBO_lineIndex);

glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, VBO_lineIndex);

glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(lineIndices), lineIndices, GL_STATIC_DRAW);

// Unbind VAO

glBindVertexArray(0);

}

// ---------------------------------------------------------------------

// PUBLIC

// ---------------------------------------------------------------------

// Constructor

PTile::PTile()

{

// Set initial values

for(int i = 0; i < 4; i += 1)

{

// Vertices

vertices[i].x = 0.0f;

vertices[i].y = 0.0f;

vertices[i].z = 0.0f;

vertices[i].w = 0.0f;

// Texcoord

texcoord[i].x = 0.0f;

texcoord[i].y = 0.0f;

}

// VBOs & VAO

VAO_tile = 0;

VBO_texture = 0;

VBO_position = 0;

// Texture

texture = 0;

}

PTile::PTile(GUVector4 pos)

{

// Set initial values

for(int i = 0; i < 4; i += 1)

{

// Vertices

vertices[i].x = 0.0f;

vertices[i].y = 0.0f;

vertices[i].z = 0.0f;

vertices[i].w = 0.0f;

// Texcoord

texcoord[i].x = 0.0f;

texcoord[i].y = 0.0f;

}

// VBOs & VAO

VAO_tile = 0;

VBO_texture = 0;

VBO_position = 0;

// Texture

texture = 0;

// And set position

position = pos;

// Run init

Initialise();

}

// Deconstructor

PTile::~PTile()

{

// Release memory

// Unbind VAO

glBindVertexArray(0);

// Unbind the VBOs

glBindBuffer(GL_ARRAY_BUFFER, 0);

glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

// Delete VBOs

glDeleteBuffers(1, &VBO_position);

glDeleteBuffers(1, &VBO_index);

glDeleteBuffers(1, &VBO_texture);

// Delete VAO

glDeleteVertexArrays(1, &VAO_tile);

// Delete shader

glDeleteShader(shader);

}

// Initialise

// Precondition: n/a

// Postcondition: Vertex data setup, texture and shader loaded, VAO setup

void PTile::Initialise()

{

// Setup vertex data

setupVertexData();

// Load resources

loadTexture();

loadShader();

// Setup VAO

setupVertexArrayObject();

}

// Render

// Precondition: Camera matrix

// Postcondition: Object rendered

void PTile::Render(const GUMatrix4& T)

{

static GLint mvpLocation = glGetUniformLocation(shader, "mvpMatrix");

GUMatrix4 MVP = T * GUMatrix4::translationMatrix(position);

// Use basic shader

glUseProgram(shader);

glUniformMatrix4fv(mvpLocation, 1, GL_FALSE, (const GLfloat*)&(MVP));

// Bind VAO & Texture

glUniform1ui(glGetUniformLocation(shader, "texture"), 0);

glBindTexture(GL_TEXTURE_2D, texture);

glBindVertexArray(VAO_tile);

// Draw Ground

if(mode == FILL)

{

glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, VBO_index);

glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, (const GLvoid*)0);

}

else if(mode == LINE)

{

glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, VBO_lineIndex);

glDrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_INT, (const GLvoid*)0);

}

// Unbind VAO & Texture

glBindVertexArray(0);

}

// Getters and Setters

void PTile::setTexture(const wstring filePath)

{

// Load Texture

texture = CGTextureLoader::loadTexture(filePath, CGTextureGenProperties(GL_LINEAR, GL_LINEAR, 2.0f, GL_REPEAT, GL_REPEAT, true));

}

void PTile::setPosition(GUVector4 pos)

{

position = pos;

}

void PTile::setPosition(float x, float y, float z)

{

position.x = x;

position.y = y;

position.z = z;

}