Rectangle.cpp

Rectangle.cpp

#include "Rectangle.hpp"


Rectangle::Rectangle()
{
	mVertices[0] =  1.0f; mVertices[1]  =  1.0f; mVertices[2]  =  0.0f;
	mVertices[3] =  1.0f; mVertices[4]  = -1.0f; mVertices[5]  =  0.0f;
	mVertices[6] = -1.0f; mVertices[7]  = -1.0f; mVertices[8]  =  0.0f;
	mVertices[9] = -1.0f; mVertices[10] =  1.0f; mVertices[11] =  0.0f;

	mIndices[0] = 0; mIndices[1] = 1; mIndices[2] = 3;
	mIndices[3] = 1; mIndices[4] = 2; mIndices[5] = 3;

	mModel = glm::mat4(1.0); // initialize to identity matrix

	glGenVertexArrays(1, &mVAO);
	glGenBuffers(1, &mVBO);
	glGenBuffers(1, &mEBO);

	glBindVertexArray(mVAO); // Bind VAO and EBO together

	glBindBuffer(GL_ARRAY_BUFFER, mVBO);
	glBufferData(GL_ARRAY_BUFFER, sizeof(mVertices), mVertices, GL_STATIC_DRAW);

	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mEBO);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(mIndices), mIndices, GL_STATIC_DRAW);

	// position attribute
	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
	glEnableVertexAttribArray(0);
}

Rectangle::~Rectangle() {}

void Rectangle::draw(const Shader& shader)
{
	// shader.use();
	shader.setMat4("model", mModel);
	glBindVertexArray(mVAO);
	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
}

void Rectangle::scale(const Shader& shader, glm::vec3& vFactor)
{
	mModel = glm::scale(mModel, vFactor);
}

void Rectangle::translate(const Shader& shader, glm::vec3& vTranslate)
{
	mModel = glm::mat4(1.0); // TODO: Why do i have to initialize this here when its initilialized in constructor????
	mModel = glm::translate(mModel, vTranslate);
}