Vertex Array Object

#include "TexturedQuad.h"

GLfloat quadVertices[] = {-0.5f,0.5f,0.0f,
                                                  -0.5f,-0.5f,0.0f,
                                                  0.5f,-0.5f,0.0f,
                                                  0.5f,0.5f,0.0f};

GLfloat quadNormals[] = { 0.0f,0.0f,1.0f,
                                                  0.0f,0.0f,1.0f,
                                                  0.0f,0.0f,1.0f,
                                                  0.0f,0.0f,1.0f};

GLfloat quadTexCoords[] = {0.0f,0.0f,
                                                   0.0f,1.0f,
                                                   1.0f,1.0f,
                                                   1.0f,0.0f};

GLuint quadIndices[] = {0, 1, 2, 2, 3, 0};

TexturedQuad::TexturedQuad(Shader *shader)
{
        this->shader = shader;

        glGenVertexArrays(1, &quadArrayObjID);
        glBindVertexArray(quadArrayObjID);

    // VBO for vertex data
        glGenBuffers(1, &quadVertexBufferObjID);
        glBindBuffer(GL_ARRAY_BUFFER, quadVertexBufferObjID);
        glBufferData(GL_ARRAY_BUFFER, 4*3*sizeof(GLfloat), quadVertices, GL_STATIC_DRAW);
        glVertexAttribPointer(glGetAttribLocation(shader->GetProgram(), "in_Position"), 3, GL_FLOAT, GL_FALSE, 0, 0);
        glEnableVertexAttribArray(glGetAttribLocation(shader->GetProgram(), "in_Position"));

    // VBO for normal data
        glGenBuffers(1, &quadNormalBufferObjID);
        glBindBuffer(GL_ARRAY_BUFFER, quadNormalBufferObjID);
        glBufferData(GL_ARRAY_BUFFER, 4*3*sizeof(GLfloat), quadNormals, GL_STATIC_DRAW);
        glVertexAttribPointer(glGetAttribLocation(shader->GetProgram(), "in_Normal"), 3, GL_FLOAT, GL_FALSE, 0, 0);
        glEnableVertexAttribArray(glGetAttribLocation(shader->GetProgram(), "in_Normal"));

        // VBO for texture data
        glGenBuffers(1, &quadTexCoordBufferObjID);
    glBindBuffer(GL_ARRAY_BUFFER, quadTexCoordBufferObjID);
    glBufferData(GL_ARRAY_BUFFER, 4*2*sizeof(GLfloat), quadTexCoords, GL_STATIC_DRAW);
    glVertexAttribPointer(glGetAttribLocation(shader->GetProgram(), "in_TexCoord"), 2, GL_FLOAT, GL_FALSE, 0, 0);
    glEnableVertexAttribArray(glGetAttribLocation(shader->GetProgram(), "in_TexCoord"));

        // Index buffer
    glGenBuffers(1, &quadIndexBufferObjID);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, quadIndexBufferObjID);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, 6*sizeof(GLuint), quadIndices, GL_STATIC_DRAW);
        glBindVertexArray(0);
}

void TexturedQuad::Render(GLMatrix<GLfloat> transform)
{
        glBindVertexArray(quadArrayObjID);
        glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0L);
}