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Viewing changes to examples/buffer_render_target.cpp

  • Committer: Package Import Robot
  • Author(s): Ubuntu daily release
  • Date: 2014-10-10 14:01:26 UTC
  • mto: This revision was merged to the branch mainline in revision 84.
  • Revision ID: package-import@ubuntu.com-20141010140126-n1czko8na1kuz4ll
Tags: upstream-0.8.0+14.10.20141010
Import upstream version 0.8.0+14.10.20141010

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examples/buffer_render_target.cpp
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/*
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 * Copyright © 2012 Canonical Ltd.
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License version 3 as
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 * published by the Free Software Foundation.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 * Authored by: Alexandros Frantzis <alexandros.frantzis@canonical.com>
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 */
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#include "buffer_render_target.h"
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#include "mir/graphics/buffer.h"
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#include <GLES2/gl2ext.h>
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#include <stdexcept>
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namespace geom = mir::geometry;
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namespace mg = mir::graphics;
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namespace mt = mir::tools;
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mt::BufferRenderTarget::BufferRenderTarget(mg::Buffer& buffer)
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    : buffer(buffer), old_fbo(), old_viewport()
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{
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    /*
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     * With the new lazy buffer allocation method, we may be executing inside
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     * the compositor's GL context. So be careful to save and restore what
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     * we change...
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     */
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    glGetIntegerv(GL_VIEWPORT, old_viewport);
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    glGetIntegerv(GL_FRAMEBUFFER_BINDING, &old_fbo);
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    resources.setup(buffer);
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}
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mt::BufferRenderTarget::~BufferRenderTarget()
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{
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    glFinish();
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    glBindFramebuffer(GL_FRAMEBUFFER, old_fbo);
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    glViewport(old_viewport[0], old_viewport[1],
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               old_viewport[2], old_viewport[3]);
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}
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void mt::BufferRenderTarget::make_current()
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{
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    geom::Size buf_size = buffer.size();
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    glBindFramebuffer(GL_FRAMEBUFFER, resources.fbo);
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    glViewport(0, 0, buf_size.width.as_uint32_t(), buf_size.height.as_uint32_t());
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}
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mt::BufferRenderTarget::Resources::~Resources()
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{
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    if (color_tex != 0)
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        glDeleteTextures(1, &color_tex);
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    if (depth_rbo != 0)
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        glDeleteRenderbuffers(1, &depth_rbo);
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    if (fbo != 0)
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        glDeleteFramebuffers(1, &fbo);
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}
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void mt::BufferRenderTarget::Resources::setup(mg::Buffer& buffer)
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{
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    geom::Size buf_size = buffer.size();
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    if (fbo == 0)
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    {
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        glGenFramebuffers(1, &fbo);
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        glBindFramebuffer(GL_FRAMEBUFFER, fbo);
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        /* Set up color buffer... */
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        glGenTextures(1, &color_tex);
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        glBindTexture(GL_TEXTURE_2D, color_tex);
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        buffer.gl_bind_to_texture();
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        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
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                               GL_TEXTURE_2D, color_tex, 0);
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        /* and depth buffer */
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        glGenRenderbuffers(1, &depth_rbo);
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        glBindRenderbuffer(GL_RENDERBUFFER, depth_rbo);
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        glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16,
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                              buf_size.width.as_uint32_t(), buf_size.height.as_uint32_t());
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        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
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                                  GL_RENDERBUFFER, depth_rbo);
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        if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
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            throw std::runtime_error("Failed to create FBO for GBM buffer");
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    }
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}