Basics of OpenGL viewer.

1 files changed, 138 insertions, 0 deletions

diff --git a/src/wx/gl_video_view.cc b/src/wx/gl_video_view.cc
new file mode 100644
index 000000000..ce17c0329
--- /dev/null
+++ b/src/wx/gl_video_view.cc
@@ -0,0 +1,138 @@
+/*
+    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_video_view.h"
+#include "lib/image.h"
+#include "lib/dcpomatic_assert.h"
+#include "lib/exceptions.h"
+#include <boost/bind.hpp>
+#include <iostream>
+
+#ifdef DCPOMATIC_OSX
+#include <OpenGL/glu.h>
+#include <OpenGL/glext.h>
+#else
+#include <GL/glu.h>
+#include <GL/glext.h>
+#endif
+
+using std::cout;
+using boost::shared_ptr;
+
+GLVideoView::GLVideoView (wxWindow *parent)
+{
+	_canvas = new wxGLCanvas (parent, wxID_ANY, 0, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE);
+	_context = new wxGLContext (_canvas);
+	_canvas->Bind (wxEVT_PAINT, boost::bind(&GLVideoView::paint, this, _1));
+
+	glGenTextures (1, &_id);
+	glBindTexture (GL_TEXTURE_2D, _id);
+	glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
+}
+
+GLVideoView::~GLVideoView ()
+{
+	glDeleteTextures (1, &_id);
+	delete _context;
+	delete _canvas;
+}
+
+static void
+check_gl_error (char const * last)
+{
+	GLenum const e = glGetError ();
+	if (e != GL_NO_ERROR) {
+		throw GLError (last, e);
+	}
+}
+
+void
+GLVideoView::paint (wxPaintEvent &)
+{
+	_canvas->SetCurrent (*_context);
+	wxPaintDC dc (_canvas);
+	glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	check_gl_error ("glClear");
+
+	glClearColor (0.0f, 0.0f, 0.0f, 1.0f);
+	check_gl_error ("glClearColor");
+	glEnable (GL_TEXTURE_2D);
+	check_gl_error ("glEnable GL_TEXTURE_2D");
+	glEnable (GL_COLOR_MATERIAL);
+	check_gl_error ("glEnable GL_COLOR_MATERIAL");
+	glEnable (GL_BLEND);
+	check_gl_error ("glEnable GL_BLEND");
+	glDisable (GL_DEPTH_TEST);
+	check_gl_error ("glDisable GL_DEPTH_TEST");
+	glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	glViewport (0, 0, _canvas->GetSize().x, _canvas->GetSize().y);
+	glMatrixMode (GL_PROJECTION);
+	glLoadIdentity ();
+
+	gluOrtho2D (0, _canvas->GetSize().x, _canvas->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();
+	_canvas->SwapBuffers();
+}
+
+void
+GLVideoView::set_image (shared_ptr<const Image> image)
+{
+	/* XXX: put this somewhere sensible */
+	cout << glGetString (GL_VERSION) << "\n";
+
+	DCPOMATIC_ASSERT (image->pixel_format() == AV_PIX_FMT_RGB24);
+	DCPOMATIC_ASSERT (!image->aligned());
+
+	_size = image->size ();
+	glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
+	glTexImage2D (GL_TEXTURE_2D, 0, GL_RGB8, _size->width, _size->height, 0, GL_RGB, GL_UNSIGNED_BYTE, image->data()[0]);
+	check_gl_error ("glTexImage2D");
+
+	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	check_gl_error ("glTexParameteri");
+
+	glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	check_gl_error ("glTexParameterf");
+
+	_canvas->Refresh ();
+}