render_target.cpp

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/*
    RenderStack  Support library for OpenGL 3+
    Copyright (C) 2010  Timo Suoranta

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "renderstack/render_target.hpp"
#include "renderstack/window.hpp"
#include "renderstack/rs_gl.h"
#include "renderstack/rs_log.h"

namespace renderstack {

render_target::render_target()
:   m_width(0)
,   m_height(0)
,   m_gl_framebuffer_object((unsigned int)(~0))
{
}

render_target::render_target(
    int width, 
    int height,
    int gl_framebuffer_object
)
:   m_width(width)
,   m_height(height)
,   m_gl_framebuffer_object(gl_framebuffer_object)
{
    m_gl_framebuffer_object = 0;

    framebuffer_attachment attachment(GL_BACK_LEFT, attachment_renderbuffer);

    attachment.renderbuffer().set(0);
}

render_target::render_target(
    int width, 
    int height
)
:   m_width(width)
,   m_height(height)
,   m_gl_framebuffer_object((unsigned int)(~0))
{
    ::GLboolean res = ::rs_gl_is_framebuffer(m_gl_framebuffer_object);
    if(res != GL_FALSE)
    {
        ::rs_gl_delete_framebuffers(1, &m_gl_framebuffer_object);
    }
    ::rs_gl_gen_framebuffers(1, &m_gl_framebuffer_object);

    ::rs_gl_bind_framebuffer(
        GL_FRAMEBUFFER,                 /*  DRAW, READ  */ 
        m_gl_framebuffer_object
    );
}

default_render_target::default_render_target(int width, int height)
:   render_target(width, height, 0)
{
}

default_render_target::default_render_target(class window const &window)
:   render_target(
        window.client_area().width(), 
        window.client_area().height(), 
        0
    )
{
}

void render_target::check() const
{
    ::GLenum status = ::rs_gl_check_framebuffer_status(GL_FRAMEBUFFER);

    if(status == GL_FRAMEBUFFER_COMPLETE)
    {
        return;
    }

    ::rs_log("framebuffer not complete: %s\n", ::rs_gl_enum_string(status));
}

framebuffer_attachment &render_target::attach_texture(int gl_attachment, int gl_format)
{
    framebuffer_attachment attachment(gl_attachment, attachment_texture);
    attachment.texture().set(
        m_width,
        m_height,
        GL_TEXTURE_2D,
        GL_TEXTURE_2D,
        GL_NEAREST,
        GL_NEAREST,
        GL_CLAMP_TO_EDGE,
        gl_format
    );

    attachment.texture().update();

    rs_gl_bind_framebuffer(
        GL_FRAMEBUFFER,                 /*  DRAW, READ  */ 
        m_gl_framebuffer_object
    );

    rs_gl_framebuffer_texture_2d(
        GL_FRAMEBUFFER,                             /*  target      DRAW, READ  */ 
        attachment.gl_attachment_point(),           /*  attachment  */ 
        attachment.texture().gl_teximage_target(),  /*  textarget   */ 
        attachment.texture().gl_texture_object(),   /*  texture     */ 
        0                                           /*  level       */ 
    );

    m_attachments.push_back(attachment);

    return m_attachments.back();
}

framebuffer_attachment &render_target::attach_renderbuffer(
    int gl_attachment, 
    int gl_format, 
    int sample_count
)
{
    framebuffer_attachment attachment(gl_attachment, attachment_renderbuffer);

    attachment.renderbuffer().set(m_width, m_height, gl_format, sample_count);

    ::rs_gl_bind_framebuffer(
        GL_FRAMEBUFFER,                         /*  DRAW, READ  */ 
        m_gl_framebuffer_object
    );

    ::rs_gl_framebuffer_renderbuffer(
        GL_FRAMEBUFFER,                                     /*  enum target         DRAW, READ  */ 
        attachment.gl_attachment_point(),                   /*  attachment          */ 
        GL_RENDERBUFFER,                                    /*  renderbuffertarget  */ 
        attachment.renderbuffer().gl_renderbuffer_object()  /*  renderbuffer        */ 
    );

    m_attachments.push_back(attachment);

    check();

    return m_attachments.back();
}


void render_target::resize(int width, int height)
{
    m_width  = width;
    m_height = height;
}


void render_target::begin() const
{
    ::rs_gl_bind_framebuffer(
        GL_FRAMEBUFFER,                 /*  DRAW, READ  */ 
        m_gl_framebuffer_object
    );
}

void render_target::end() const
{
    ::rs_gl_bind_framebuffer(GL_FRAMEBUFFER, 0);
}

void render_target::blit(render_target const &dst) const
{
    ::rs_gl_bind_framebuffer(GL_READ_FRAMEBUFFER, gl_framebuffer_object());
    ::rs_gl_bind_framebuffer(GL_DRAW_FRAMEBUFFER, dst.gl_framebuffer_object());

    ::rs_gl_blit_framebuffer(
        0,                      /*  GLint       srcX0,  */ 
        0,                      /*  GLint       srcY0,  */ 
        width(),                /*  GLint       srcX1,  */ 
        height(),               /*  GLint       srcY1,  */ 
        0,                      /*  GLint       dstX0,  */ 
        0,                      /*  GLint       dstY0,  */ 
        dst.width(),            /*  GLint       dstX1,  */ 
        dst.height(),           /*  GLint       dstY1,  */ 
        GL_COLOR_BUFFER_BIT,  /*  GLbitfield  mask,   */ 
        GL_NEAREST            /*  GLenum      filter  */ 
    );
}

void render_target::debug() const
{
    int framebuffer         = GL_DRAW_FRAMEBUFFER;      /*  READ, DRAW      */ 
    int color_attachment    = GL_COLOR_ATTACHMENT0;     /*  GL_BACK_LEFT    */ 
    int depth_attachment    = GL_DEPTH_ATTACHMENT;
    int stencil_attachment  = GL_STENCIL_ATTACHMENT;

    {
        int params[4];

        ::rs_gl_get_framebuffer_attachment_parameter_iv(
            framebuffer,                                /*  target, DRAW, READ  */ 
            color_attachment,                           /*  attachment          */ 
            GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,    /*  pname               */ 
            &params[0]                                  /*  params              */ 
        );
        ::rs_log(
            "color attachment object type = %s\n", 
            ::rs_gl_enum_string(params[0])
        );

        ::rs_gl_get_framebuffer_attachment_parameter_iv(
            framebuffer,                                /*  target, DRAW, READ  */ 
            color_attachment,                           /*  attachment          */ 
            GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,    /*  pname               */ 
            &params[0]                                  /*  params              */ 
        );
        ::rs_log("color attachment object name = %d\n", params[0]);

        ::rs_gl_get_framebuffer_attachment_parameter_iv(
            framebuffer,                                /*  target, DRAW, READ  */ 
            color_attachment,                           /*  attachment          */ 
            GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE, /*  pname               */ 
            &params[0]                                  /*  params              */ 
        );
        ::rs_log(
            "color attachment component type = %s\n", 
            ::rs_gl_enum_string(params[0])
        );

        ::rs_gl_get_framebuffer_attachment_parameter_iv(
            framebuffer,                                /*  target, DRAW, READ  */ 
            color_attachment,                           /*  attachment          */ 
            GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING, /*  pname               */ 
            &params[0]                                  /*  params              */ 
        );
        ::rs_log(
            "color attachment color encoding type = %s\n", 
            ::rs_gl_enum_string(params[0])
        );

        ::rs_gl_get_framebuffer_attachment_parameter_iv(
            framebuffer,                            /*  target, DRAW, READ  */ 
            color_attachment,                       /*  attachment          */ 
            GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE,   /*  pname               */ 
            &params[0]                              /*  params              */ 
        );
        ::rs_log(
            "color attachment red size = %d\n", 
            params[0]
        );

        ::rs_gl_get_framebuffer_attachment_parameter_iv(
            framebuffer,                            /*  target, DRAW, READ  */ 
            color_attachment,                       /*  attachment          */ 
            GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE, /*  pname               */ 
            &params[0]                              /*  params              */ 
        );
        ::rs_log(
            "color attachment green size = %d\n", 
            params[0]
        );

        ::rs_gl_get_framebuffer_attachment_parameter_iv(
            framebuffer,                            /*  target, DRAW, READ  */ 
            color_attachment,                       /*  attachment          */ 
            GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE,  /*  pname               */ 
            &params[0]                              /*  params              */ 
        );
        ::rs_log(
            "color attachment blue size = %d\n", 
            params[0]
        );

        ::rs_gl_get_framebuffer_attachment_parameter_iv(
            framebuffer,                            /*  target, DRAW, READ  */ 
            color_attachment,                       /*  attachment          */ 
            GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE, /*  pname               */ 
            &params[0]                              /*  params              */ 
        );
        ::rs_log(
            "color attachment alpha size = %d\n", 
            params[0]
        );

        ::rs_gl_get_framebuffer_attachment_parameter_iv(
            framebuffer,                            /*  target, DRAW, READ  */ 
            depth_attachment,                       /*  attachment          */ 
            GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE, /*  pname               */ 
            &params[0]                              /*  params              */ 
        );
        ::rs_log(
            "depth attachment depth size = %d\n", 
            params[0]
        );

        ::rs_gl_get_framebuffer_attachment_parameter_iv(
            framebuffer,                                /*  target, DRAW, READ  */ 
            stencil_attachment,                         /*  attachment          */ 
            GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE,   /*  pname               */ 
            &params[0]                                  /*  params              */ 
        );
        ::rs_log(
            "stencil attachment stencil size = %d\n", 
            params[0]
        );
    }
}

}