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5eb57ae5f1
Because the sf::Texture::m_texture value changes when the texture is reloaded from disk, we need to rebind the texture since the previously bound sf::Texture::m_texture value is no longer a valid identifier.
340 lines
12 KiB
C++
340 lines
12 KiB
C++
////////////////////////////////////////////////////////////
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// Headers
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////////////////////////////////////////////////////////////
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#include <SFML/Graphics.hpp>
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#include <array>
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#include <filesystem>
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#include <iostream>
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#include <cstdlib>
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#define GLAD_GL_IMPLEMENTATION
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#include <gl.h>
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#ifdef SFML_SYSTEM_IOS
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#include <SFML/Main.hpp>
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#endif
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#ifndef GL_SRGB8_ALPHA8
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#define GL_SRGB8_ALPHA8 0x8C43
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#endif
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std::filesystem::path resourcesDir()
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{
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#ifdef SFML_SYSTEM_IOS
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return "";
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#else
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return "resources";
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#endif
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}
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////////////////////////////////////////////////////////////
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/// Entry point of application
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///
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/// \return Application exit code
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///
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////////////////////////////////////////////////////////////
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int main()
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{
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bool exit = false;
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bool sRgb = false;
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while (!exit)
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{
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// Request a 24-bits depth buffer when creating the window
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sf::ContextSettings contextSettings;
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contextSettings.depthBits = 24;
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contextSettings.sRgbCapable = sRgb;
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// Create the main window
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sf::RenderWindow window(sf::VideoMode({800, 600}),
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"SFML graphics with OpenGL",
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sf::Style::Default,
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sf::State::Windowed,
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contextSettings);
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window.setVerticalSyncEnabled(true);
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window.setMinimumSize(sf::Vector2u(400, 300));
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window.setMaximumSize(sf::Vector2u(1200, 900));
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// Create a sprite for the background
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const auto backgroundTexture = sf::Texture::loadFromFile(resourcesDir() / "background.jpg", sRgb).value();
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const sf::Sprite background(backgroundTexture);
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// Create some text to draw on top of our OpenGL object
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const auto font = sf::Font::openFromFile(resourcesDir() / "tuffy.ttf").value();
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sf::Text text(font, "SFML / OpenGL demo");
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sf::Text sRgbInstructions(font, "Press space to toggle sRGB conversion");
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sf::Text mipmapInstructions(font, "Press return to toggle mipmapping");
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text.setFillColor(sf::Color(255, 255, 255, 170));
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sRgbInstructions.setFillColor(sf::Color(255, 255, 255, 170));
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mipmapInstructions.setFillColor(sf::Color(255, 255, 255, 170));
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text.setPosition({280.f, 450.f});
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sRgbInstructions.setPosition({175.f, 500.f});
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mipmapInstructions.setPosition({200.f, 550.f});
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// Load a texture to apply to our 3D cube
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auto texture = sf::Texture::loadFromFile(resourcesDir() / "logo.png").value();
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// Attempt to generate a mipmap for our cube texture
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// We don't check the return value here since
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// mipmapping is purely optional in this example
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(void)texture.generateMipmap();
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// Make the window the active window for OpenGL calls
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if (!window.setActive(true))
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{
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std::cerr << "Failed to set window to active" << std::endl;
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return EXIT_FAILURE;
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}
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// Load OpenGL or OpenGL ES entry points using glad
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#ifdef SFML_OPENGL_ES
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gladLoadGLES1(sf::Context::getFunction);
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#else
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gladLoadGL(sf::Context::getFunction);
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#endif
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// Enable Z-buffer read and write
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glEnable(GL_DEPTH_TEST);
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glDepthMask(GL_TRUE);
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#ifdef SFML_OPENGL_ES
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glClearDepthf(1.f);
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#else
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glClearDepth(1.f);
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#endif
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// Disable lighting
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glDisable(GL_LIGHTING);
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// Configure the viewport (the same size as the window)
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glViewport(0, 0, static_cast<GLsizei>(window.getSize().x), static_cast<GLsizei>(window.getSize().y));
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// Setup a perspective projection
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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const GLfloat ratio = static_cast<float>(window.getSize().x) / static_cast<float>(window.getSize().y);
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#ifdef SFML_OPENGL_ES
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glFrustumf(-ratio, ratio, -1.f, 1.f, 1.f, 500.f);
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#else
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glFrustum(-ratio, ratio, -1.f, 1.f, 1.f, 500.f);
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#endif
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// Bind the texture
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glEnable(GL_TEXTURE_2D);
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sf::Texture::bind(&texture);
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// Define a 3D cube (6 faces made of 2 triangles composed by 3 vertices)
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// clang-format off
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constexpr std::array<GLfloat, 180> cube =
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{
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// positions // texture coordinates
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-20, -20, -20, 0, 0,
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-20, 20, -20, 1, 0,
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-20, -20, 20, 0, 1,
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-20, -20, 20, 0, 1,
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-20, 20, -20, 1, 0,
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-20, 20, 20, 1, 1,
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20, -20, -20, 0, 0,
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20, 20, -20, 1, 0,
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20, -20, 20, 0, 1,
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20, -20, 20, 0, 1,
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20, 20, -20, 1, 0,
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20, 20, 20, 1, 1,
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-20, -20, -20, 0, 0,
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20, -20, -20, 1, 0,
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-20, -20, 20, 0, 1,
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-20, -20, 20, 0, 1,
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20, -20, -20, 1, 0,
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20, -20, 20, 1, 1,
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-20, 20, -20, 0, 0,
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20, 20, -20, 1, 0,
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-20, 20, 20, 0, 1,
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-20, 20, 20, 0, 1,
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20, 20, -20, 1, 0,
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20, 20, 20, 1, 1,
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-20, -20, -20, 0, 0,
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20, -20, -20, 1, 0,
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-20, 20, -20, 0, 1,
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-20, 20, -20, 0, 1,
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20, -20, -20, 1, 0,
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20, 20, -20, 1, 1,
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-20, -20, 20, 0, 0,
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20, -20, 20, 1, 0,
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-20, 20, 20, 0, 1,
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-20, 20, 20, 0, 1,
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20, -20, 20, 1, 0,
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20, 20, 20, 1, 1
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};
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// clang-format on
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// Enable position and texture coordinates vertex components
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glVertexPointer(3, GL_FLOAT, 5 * sizeof(GLfloat), cube.data());
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glTexCoordPointer(2, GL_FLOAT, 5 * sizeof(GLfloat), cube.data() + 3);
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// Disable normal and color vertex components
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glDisableClientState(GL_NORMAL_ARRAY);
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glDisableClientState(GL_COLOR_ARRAY);
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// Make the window no longer the active window for OpenGL calls
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if (!window.setActive(false))
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{
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std::cerr << "Failed to set window to inactive" << std::endl;
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return EXIT_FAILURE;
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}
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// Create a clock for measuring the time elapsed
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const sf::Clock clock;
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// Flag to track whether mipmapping is currently enabled
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bool mipmapEnabled = true;
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// Start game loop
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while (window.isOpen())
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{
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// Process events
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while (const std::optional event = window.pollEvent())
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{
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// Window closed or escape key pressed: exit
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if (event->is<sf::Event::Closed>() ||
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(event->is<sf::Event::KeyPressed>() &&
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event->getIf<sf::Event::KeyPressed>()->code == sf::Keyboard::Key::Escape))
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{
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exit = true;
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window.close();
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}
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// Return key: toggle mipmapping
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if (const auto* keyPressed = event->getIf<sf::Event::KeyPressed>();
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keyPressed && keyPressed->code == sf::Keyboard::Key::Enter)
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{
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if (mipmapEnabled)
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{
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// We simply reload the texture to disable mipmapping
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texture = sf::Texture::loadFromFile(resourcesDir() / "logo.png").value();
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// Rebind the texture
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sf::Texture::bind(&texture);
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mipmapEnabled = false;
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}
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else if (texture.generateMipmap())
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{
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mipmapEnabled = true;
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}
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}
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// Space key: toggle sRGB conversion
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if (const auto* keyPressed = event->getIf<sf::Event::KeyPressed>();
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keyPressed && keyPressed->code == sf::Keyboard::Key::Space)
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{
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sRgb = !sRgb;
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window.close();
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}
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// Adjust the viewport when the window is resized
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if (const auto* resized = event->getIf<sf::Event::Resized>())
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{
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const sf::Vector2u textureSize = backgroundTexture.getSize();
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// Make the window the active window for OpenGL calls
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if (!window.setActive(true))
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{
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std::cerr << "Failed to set window to active" << std::endl;
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return EXIT_FAILURE;
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}
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const auto [width, height] = resized->size;
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glViewport(0, 0, static_cast<GLsizei>(width), static_cast<GLsizei>(height));
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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const GLfloat newRatio = static_cast<float>(width) / static_cast<float>(height);
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#ifdef SFML_OPENGL_ES
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glFrustumf(-newRatio, newRatio, -1.f, 1.f, 1.f, 500.f);
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#else
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glFrustum(-newRatio, newRatio, -1.f, 1.f, 1.f, 500.f);
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#endif
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// Make the window no longer the active window for OpenGL calls
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if (!window.setActive(false))
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{
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std::cerr << "Failed to set window to inactive" << std::endl;
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return EXIT_FAILURE;
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}
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sf::View view;
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view.setSize(sf::Vector2f(textureSize));
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view.setCenter(sf::Vector2f(textureSize) / 2.f);
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window.setView(view);
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}
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}
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// Draw the background
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window.pushGLStates();
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window.draw(background);
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window.popGLStates();
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// Make the window the active window for OpenGL calls
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if (!window.setActive(true))
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{
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// On failure, try re-creating the window, as it is intentionally
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// closed when changing color space.
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continue;
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}
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// Clear the depth buffer
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glClear(GL_DEPTH_BUFFER_BIT);
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// We get the position of the mouse cursor (or touch), so that we can move the box accordingly
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sf::Vector2i pos;
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#ifdef SFML_SYSTEM_IOS
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pos = sf::Touch::getPosition(0);
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#else
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pos = sf::Mouse::getPosition(window);
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#endif
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const float x = static_cast<float>(pos.x) * 200.f / static_cast<float>(window.getSize().x) - 100.f;
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const float y = -static_cast<float>(pos.y) * 200.f / static_cast<float>(window.getSize().y) + 100.f;
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// Apply some transformations
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(x, y, -100.f);
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glRotatef(clock.getElapsedTime().asSeconds() * 50.f, 1.f, 0.f, 0.f);
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glRotatef(clock.getElapsedTime().asSeconds() * 30.f, 0.f, 1.f, 0.f);
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glRotatef(clock.getElapsedTime().asSeconds() * 90.f, 0.f, 0.f, 1.f);
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// Draw the cube
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glDrawArrays(GL_TRIANGLES, 0, 36);
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// Make the window no longer the active window for OpenGL calls
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if (!window.setActive(false))
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{
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std::cerr << "Failed to set window to inactive" << std::endl;
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return EXIT_FAILURE;
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}
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// Draw some text on top of our OpenGL object
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window.pushGLStates();
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window.draw(text);
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window.draw(sRgbInstructions);
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window.draw(mipmapInstructions);
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window.popGLStates();
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// Finally, display the rendered frame on screen
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window.display();
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}
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}
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return EXIT_SUCCESS;
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}
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