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/*
Copyright (C) 2018-2019 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "gl_view.h"
#include "lib/image.h"
#include "lib/dcpomatic_assert.h"
#include <boost/bind.hpp>
#include <iostream>
#include <GL/glu.h>
using std::cout;
using boost::shared_ptr;
GLView::GLView (wxWindow *parent)
: wxGLCanvas (parent, wxID_ANY, 0, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE)
{
_context = new wxGLContext (this);
Bind (wxEVT_PAINT, boost::bind(&GLView::paint, this, _1));
glGenTextures (1, &_id);
glBindTexture (GL_TEXTURE_2D, _id);
glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
}
GLView::~GLView ()
{
glDeleteTextures (1, &_id);
delete _context;
}
static void
check_gl_error (char const * last)
{
GLenum const e = glGetError ();
if (e != GL_NO_ERROR) {
cout << last << " failed " << e << " (";
if (e == GL_INVALID_VALUE) {
cout << "invalid value";
} else if (e == GL_INVALID_ENUM) {
cout << "invalid enum";
} else {
cout << "unknown";
}
cout << ")\n";
}
}
void
GLView::paint (wxPaintEvent &)
{
SetCurrent (*_context);
wxPaintDC (this);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
check_gl_error ("glClear");
glClearColor (0.0f, 0.0f, 0.0f, 1.0f);
glEnable (GL_TEXTURE_2D);
glEnable (GL_COLOR_MATERIAL);
glEnable (GL_BLEND);
glDisable (GL_DEPTH_TEST);
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glViewport (0, 0, GetSize().x, GetSize().y);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
gluOrtho2D (0, GetSize().x, GetSize().y, 0);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
glTranslatef (0, 0, 0);
if (_size) {
glBegin (GL_QUADS);
glTexCoord2f (0, 1);
glVertex2f (0, _size->height);
glTexCoord2f (1, 1);
glVertex2f (_size->width, _size->height);
glTexCoord2f (1, 0);
glVertex2f (_size->width, 0);
glTexCoord2f (0, 0);
glVertex2f (0, 0);
glEnd ();
}
glFlush();
SwapBuffers();
}
void
GLView::set_image (shared_ptr<const Image> image)
{
DCPOMATIC_ASSERT (image->pixel_format() == AV_PIX_FMT_RGB24);
DCPOMATIC_ASSERT (!image->aligned());
_size = image->size ();
glTexImage2D (GL_TEXTURE_2D, 0, GL_RGB8, image->size().width, image->size().height, 0, GL_RGB, GL_UNSIGNED_BYTE, image->data()[0]);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
Refresh ();
}
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