{

RenderTargetTexture() : m_texture(-1), m_fbo(-1)

{}

void SetupDepthAttachment(GLsizei width, GLsizei height)

{

glGenFramebuffers(1, &m_fbo);

glGenTextures(1, &m_texture);

glBindTexture(GL_TEXTURE_2D, m_texture);

glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,

width, height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 0);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

// attach depth texture as FBO's depth buffer

glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, m_texture, 0);

glDrawBuffer(GL_NONE);

glReadBuffer(GL_NONE);

glBindFramebuffer(GL_FRAMEBUFFER, 0);

glBindTexture(GL_TEXTURE_2D, 0);

}

void SetupColorAttachment(GLsizei width, GLsizei height, bool b_depth_info = false)

{

glGenFramebuffers(1, &m_fbo);

glGenTextures(1, &m_texture);

glBindTexture(GL_TEXTURE_2D, m_texture);

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F,

width, height, 0, GL_RGBA, GL_FLOAT, 0);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

// attach texture to color buffer

glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);

// generate render buffer object if we need depth testing

if (b_depth_info)

{

glGenRenderbuffers(1, &m_rbo);

glBindRenderbuffer(GL_RENDERBUFFER, m_rbo);

glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);

glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, m_rbo);

}

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_texture, 0);

//glDrawBuffer(GL_NONE);

//glReadBuffer(GL_NONE);

glBindFramebuffer(GL_FRAMEBUFFER, 0);

glBindTexture(GL_TEXTURE_2D, 0);

}

GLuint m_texture;

GLuint m_fbo;

GLuint m_rbo; // render buffer object