Function screenQuadVAO

src/backend/opengl/common.cpp:304–335

}

GLuint screenQuadVAO(const int pWindowId)
{
    static std::map<int, GLuint> svaoMap;

    if (svaoMap.find(pWindowId)==svaoMap.end()) {
        static const float texcords[8]  = {0.0,1.0,1.0,1.0,1.0,0.0,0.0,0.0};
        static const uint indices[6]    = {0,1,2,0,2,3};

        GLuint tbo  = createBuffer(GL_ARRAY_BUFFER, 8, texcords, GL_STATIC_DRAW);
        GLuint ibo  = createBuffer(GL_ELEMENT_ARRAY_BUFFER, 6, indices, GL_STATIC_DRAW);

        GLuint vao = 0;
        glGenVertexArrays(1, &vao);
        glBindVertexArray(vao);
        // attach vbo
        glEnableVertexAttribArray(0);
        glBindBuffer(GL_ARRAY_BUFFER, screenQuadVBO(pWindowId));
        glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, NULL);
        // attach tbo
        glEnableVertexAttribArray(1);
        glBindBuffer(GL_ARRAY_BUFFER, tbo);
        glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, NULL);
        // attach ibo
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
        glBindVertexArray(0);
        /* store the vertex array object corresponding to
         * the window instance in the map */
        svaoMap[pWindowId] = vao;
    }

    return svaoMap[pWindowId];
}

std::ostream& operator<<(std::ostream& pOut, const glm::mat4& pMat)
{