renderbuffer.hpp

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#pragma once

#include <gls/headercheck.hpp>
#include <gls/errorcheck.hpp>
#include <gls/objects/object.hpp>
#include <cassert>

namespace gls {

namespace priv {
    void gen_renderbuffers( GLsizei size, GLuint* name ) { glGenRenderbuffers( size, name ); }
    void delete_renderbuffers( GLsizei size, const GLuint* name ) { glDeleteRenderbuffers( size, name ); }
}

class renderbuffer {
public:
    renderbuffer( GLenum internal_format, GLsizei the_width, GLsizei the_height ) :
        renderbuffer( 0, internal_format, the_width, the_height )
    {
    }

    renderbuffer( GLsizei samples, GLenum internal_format, GLsizei the_width, GLsizei the_height ) :
        m_width( the_width ),
        m_height( the_height )
    {
        auto max_samples = GLint();
        auto max_renderbuffer_size = GLint();

        check_gl_error( glGetIntegerv( GL_MAX_SAMPLES, &max_samples ) );
        check_gl_error( glGetIntegerv( GL_MAX_RENDERBUFFER_SIZE, &max_renderbuffer_size ) );

        assert( samples <= static_cast<GLsizei>( max_samples ) );
        assert( the_width <= static_cast<GLsizei>( max_renderbuffer_size ) );
        assert( the_height <= static_cast<GLsizei>( max_renderbuffer_size ) );

        bind();
        check_gl_error( glRenderbufferStorageMultisample( GL_RENDERBUFFER, samples, internal_format, the_width, the_height ) );
        unbind();
    }

    GLuint name() const {
        return m_object.name();
    }

    GLsizei width() const {
        return m_width;
    }

    GLsizei height() const {
        return m_width;
    }

    void bind() {
        check_gl_error( glBindRenderbuffer( GL_RENDERBUFFER, m_object.name() ) );
    }

    static void unbind() {
        check_gl_error( glBindRenderbuffer( GL_RENDERBUFFER, 0 ) );
    }

private:
    object<priv::gen_renderbuffers, priv::delete_renderbuffers> m_object;
    GLsizei m_width;
    GLsizei m_height;
};

}