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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef INCLUDED_VCL_OPENGL_OPENGLHELPER_HXX
#define INCLUDED_VCL_OPENGL_OPENGLHELPER_HXX
#include <GL/glew.h>
#include <vcl/vclopengl_dllapi.hxx>
#include <vcl/bitmapex.hxx>
#include <rtl/ustring.hxx>
#if defined UNX && !defined MACOSX && !defined IOS && !defined ANDROID
# include <prex.h>
# include "GL/glxew.h"
# include <postx.h>
#endif
class VCLOPENGL_DLLPUBLIC OpenGLHelper
{
public:
static GLint LoadShaders(const OUString& rVertexShaderName, const OUString& rFragmentShaderName);
/**
* The caller is responsible for allocate the memory for the RGBA buffer, before call
* this method. RGBA buffer size is assumed to be 4*width*height.
* Since OpenGL uses textures flipped relative to BitmapEx storage this method
* also adds the possibility to mirror the bitmap vertically at the same time.
**/
static void ConvertBitmapExToRGBATextureBuffer(const BitmapEx& rBitmapEx, sal_uInt8* o_pRGBABuffer, const bool bFlip = false);
static BitmapEx ConvertBGRABufferToBitmapEx(const sal_uInt8* const pBuffer, long nWidth, long nHeight);
static void renderToFile(long nWidth, long nHeight, const OUString& rFileName);
static const char* GLErrorString(GLenum errorCode);
/**
* The caller is responsible for deleting the buffer objects identified by
* nFramebufferId, nRenderbufferDepthId and nRenderbufferColorId
* @param bRenderbuffer true => off-screen rendering, false => rendering to texture
* This also affects whether to free with glDeleteRenderbuffers or glDeleteTextures
*/
static void createFramebuffer(long nWidth, long nHeight, GLuint& nFramebufferId,
GLuint& nRenderbufferDepthId, GLuint& nRenderbufferColorId, bool bRenderbuffer = true);
// Get OpenGL version (needs a context)
static float getGLVersion();
static void checkGLError(const char* aFile, size_t nLine);
/**
* checks if the system supports all features that are necessary for the OpenGL VCL support
*/
static bool supportsVCLOpenGL();
#if defined UNX && !defined MACOSX && !defined IOS && !defined ANDROID
static bool GetVisualInfo(Display* pDisplay, int nScreen, XVisualInfo& rVI);
static GLXFBConfig GetPixmapFBConfig( Display* pDisplay, bool& bInverted );
#endif
};
#define CHECK_GL_ERROR() OpenGLHelper::checkGLError(__FILE__, __LINE__)
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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