Method Process

src/SHADERed/UI/FrameAnalysisUI.cpp:5–37

namespace ed {
	void FrameAnalysisUI::Process()
	{
		for (int i = 0; i < 256; i++) {
			m_histogramR[i] = m_histogramG[i] = m_histogramB[i] = 0.0f;
			m_histogramRGB[i] = 0.0f;
		}

		// get texture data
		glm::ivec2 rendererSize = m_data->Renderer.GetLastRenderSize();
		uint8_t* pixels = (uint8_t*)malloc(rendererSize.x * rendererSize.y * 4);
		glBindTexture(GL_TEXTURE_2D, m_data->Renderer.GetTexture());
		glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
		glBindTexture(GL_TEXTURE_2D, 0);

		// build histogram
		for (int x = 0; x < rendererSize.x; x++) {
			for (int y = 0; y < rendererSize.y; y++) {
				uint8_t* px = &pixels[(y * rendererSize.x + x) * 4];

				m_histogramR[px[0]]++;
				m_histogramG[px[1]]++;
				m_histogramB[px[2]]++;

				// TODO: is this even how RGB histogram works? I just did this by my logic idk tho, compare with Photoshop 
				m_histogramRGB[px[0]]++;
				m_histogramRGB[px[1]]++;
				m_histogramRGB[px[2]]++;
			}
		}

		// free memory
		free(pixels);
	}
	void FrameAnalysisUI::OnEvent(const SDL_Event& e)
	{
	}