Method dumpNextFrameToPng

examples/OpenGLWindow/SimpleOpenGL3App.cpp:1137–1168

	}
}
void SimpleOpenGL3App::dumpNextFrameToPng(const char* filename)
{
	// open pipe to ffmpeg's stdin in binary write mode

	m_data->m_frameDumpPngFileName = filename;

	//you could use m_renderTexture to allow to render at higher resolutions, such as 4k or so
	if (!m_data->m_renderTexture)
	{
		m_data->m_renderTexture = new GLRenderToTexture();
		GLuint renderTextureId;
		glGenTextures(1, &renderTextureId);

		// "Bind" the newly created texture : all future texture functions will modify this texture
		glBindTexture(GL_TEXTURE_2D, renderTextureId);

		// Give an empty image to OpenGL ( the last "0" )
		//glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, g_OpenGLWidth,g_OpenGLHeight, 0,GL_RGBA, GL_UNSIGNED_BYTE, 0);
		//glTexImage2D(GL_TEXTURE_2D, 0,GL_RGBA32F, g_OpenGLWidth,g_OpenGLHeight, 0,GL_RGBA, GL_FLOAT, 0);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F,
					 m_instancingRenderer->getScreenWidth() * m_window->getRetinaScale(), m_instancingRenderer->getScreenHeight() * m_window->getRetinaScale(), 0, GL_RGBA, GL_FLOAT, 0);

		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
		//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
		//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

		m_data->m_renderTexture->init(m_instancingRenderer->getScreenWidth() * m_window->getRetinaScale(), this->m_instancingRenderer->getScreenHeight() * m_window->getRetinaScale(), renderTextureId, RENDERTEXTURE_COLOR);
	}

	m_data->m_renderTexture->enable();
}

void SimpleOpenGL3App::setUpAxis(int axis)
{