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/*
Copyright (C) 2025 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/>.
*/
#ifndef DCPOMATIC_GL_UTIL_H
#define DCPOMATIC_GL_UTIL_H
#include <dcp/types.h>
#include <wx/wx.h>
/* This will only build on an new-enough wxWidgets: see the comment in gl_video_view.h */
#if wxCHECK_VERSION(3,1,0)
#ifdef DCPOMATIC_OSX
#define GL_DO_NOT_WARN_IF_MULTI_GL_VERSION_HEADERS_INCLUDED
#include <OpenGL/OpenGL.h>
#include <OpenGL/gl3.h>
#endif
#ifdef DCPOMATIC_LINUX
#include <GL/glu.h>
#include <GL/glext.h>
#endif
#ifdef DCPOMATIC_WINDOWS
#include <GL/glu.h>
#include <GL/wglext.h>
#endif
class Image;
extern GLuint compile_shader(GLenum type, char const* source);
extern void check_gl_error(char const* last);
namespace dcpomatic {
namespace gl {
class Rectangle
{
public:
Rectangle(wxSize canvas_size, float x, float y, dcp::Size size)
: _canvas_size(canvas_size)
{
auto const x1 = x_pixels_to_gl(x);
auto const y1 = y_pixels_to_gl(y);
auto const x2 = x_pixels_to_gl(x + size.width);
auto const y2 = y_pixels_to_gl(y + size.height);
/* The texture coordinates here have to account for the fact that when we put images into the texture OpenGL
* expected us to start at the lower left but we actually started at the top left. So although the
* top of the texture is at 1.0 we pretend it's the other way round.
*/
// bottom right
_vertices[0] = x2;
_vertices[1] = y2;
_vertices[2] = 0.0f;
_vertices[3] = 1.0f;
_vertices[4] = 1.0f;
// top right
_vertices[5] = x2;
_vertices[6] = y1;
_vertices[7] = 0.0f;
_vertices[8] = 1.0f;
_vertices[9] = 0.0f;
// top left
_vertices[10] = x1;
_vertices[11] = y1;
_vertices[12] = 0.0f;
_vertices[13] = 0.0f;
_vertices[14] = 0.0f;
// bottom left
_vertices[15] = x1;
_vertices[16] = y2;
_vertices[17] = 0.0f;
_vertices[18] = 0.0f;
_vertices[19] = 1.0f;
}
float const * vertices() const {
return _vertices;
}
/** @return size of data returned from vertices() in bytes */
int const size() const {
return sizeof(_vertices);
}
private:
/* @param x x position in pixels where 0 is left and canvas_width is right on screen */
float x_pixels_to_gl(int x) const {
return (x * 2.0f / _canvas_size.GetWidth()) - 1.0f;
}
/* @param y y position in pixels where 0 is top and canvas_height is bottom on screen */
float y_pixels_to_gl(int y) const {
return 1.0f - (y * 2.0f / _canvas_size.GetHeight());
}
wxSize _canvas_size;
float _vertices[20];
};
class Texture
{
public:
/** @param unit Unit, or index, of this texture (from 0 to GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1) */
Texture(GLint unpack_alignment, int unit = 0);
~Texture();
Texture(Texture const&) = delete;
Texture& operator=(Texture const&) = delete;
void bind();
void set(std::shared_ptr<const Image> image, int component = 0);
private:
GLuint _name;
GLint _unpack_alignment;
int _unit;
boost::optional<dcp::Size> _size;
};
}
}
#endif
#endif
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