#include <openglscreenshothelper.h>

Inheritance diagram for OpenGLScreenshotHelper:

Public Member Functions
	OpenGLScreenshotHelper ()

	~OpenGLScreenshotHelper ()

void	prepare ()

SDL_Surface *	getScreenshot ()

Public Member Functions inherited from ScreenshotHelper
	ScreenshotHelper ()

virtual	~ScreenshotHelper ()

Private Attributes
FBOInfo	mFbo

Detailed Description

Definition at line 35 of file openglscreenshothelper.h.

Constructor & Destructor Documentation

◆ OpenGLScreenshotHelper()

OpenGLScreenshotHelper::OpenGLScreenshotHelper ( )

Definition at line 39 of file openglscreenshothelper.cpp.

                                                :
     ScreenshotHelper(),
     mFbo()
 {
 }

◆ ~OpenGLScreenshotHelper()

OpenGLScreenshotHelper::~OpenGLScreenshotHelper ( )

Definition at line 45 of file openglscreenshothelper.cpp.

46 {

47 }

Member Function Documentation

◆ getScreenshot()

SDL_Surface * OpenGLScreenshotHelper::getScreenshot ( )

virtual

< Surface is in system memory

< Surface is in video memory

< Use asynchronous blits if possible

< Surface is RLE encoded

< Surface is in video memory

< Use asynchronous blits if possible

< Surface is RLE encoded

Implements ScreenshotHelper.

Definition at line 57 of file openglscreenshothelper.cpp.

 {
     const int h = mainGraphics->mHeight;
     const int w = mainGraphics->mWidth - (mainGraphics->mWidth % 4);
     GLint pack = 1;
  
     SDL_Surface *const screenshot = MSDL_CreateRGBSurface(
         SDL_SWSURFACE, w, h, 24,
         0xff0000, 0x00ff00, 0x0000ff, 0x000000);
  
     if (screenshot == nullptr)
         return nullptr;
  
     if (SDL_MUSTLOCK(screenshot))
         SDL_LockSurface(screenshot);
  
     const size_t lineSize = 3 * w;
     GLubyte *const buf = new GLubyte[lineSize];
  
     // Grap the pixel buffer and write it to the SDL surface
     mglGetIntegerv(GL_PACK_ALIGNMENT, &pack);
     mglPixelStorei(GL_PACK_ALIGNMENT, 1);
     mglReadPixels(0, 0, w, h, GL_RGB, GL_UNSIGNED_BYTE, screenshot->pixels);
  
     // Flip the screenshot, as OpenGL has 0,0 in bottom left
     const int h2 = h / 2;
     for (int i = 0; i < h2; i++)
     {
         GLubyte *const top = static_cast<GLubyte*>(
             screenshot->pixels) + lineSize * i;
         GLubyte *const bot = static_cast<GLubyte*>(
             screenshot->pixels) + lineSize * (h - 1 - i);
  
         memcpy(buf, top, lineSize);
         memcpy(top, bot, lineSize);
         memcpy(bot, buf, lineSize);
     }
  
     delete [] buf;
  
     if (config.getBoolValue("usefbo"))
         graphicsManager.deleteFBO(&mFbo);
  
     mglPixelStorei(GL_PACK_ALIGNMENT, pack);
  
     if (SDL_MUSTLOCK(screenshot))
         SDL_UnlockSurface(screenshot);
  
     return screenshot;
 }

References config, GraphicsManager::deleteFBO(), Configuration::getBoolValue(), graphicsManager, mainGraphics, mFbo, mglGetIntegerv, mglPixelStorei, mglReadPixels, Graphics::mHeight, MSDL_CreateRGBSurface, Graphics::mWidth, Actions::screenshot(), and top.

◆ prepare()

void OpenGLScreenshotHelper::prepare ( )

virtual

Implements ScreenshotHelper.

Definition at line 49 of file openglscreenshothelper.cpp.

 {
     if (config.getBoolValue("usefbo"))
         graphicsManager.createFBO(mainGraphics->mWidth,
             mainGraphics->mHeight,
             &mFbo);
 }