Question

我正在尝试在LWJGL 3中绘制一个消除锯齿的正方形。我只绘制2D精灵，而不是绘制纹理。 This对类似问题的回答表明，LWJGL中的抗锯齿必须通过后处理来实现，但实际上并未提供有关如何执行此操作的示例或任何资源。下面是一些代码的示例。 This is what is rendered on screen from the code.请告诉我如何修改此代码以使抗锯齿成为可能。

import java.nio.FloatBuffer;
import java.nio.IntBuffer;

import org.lwjgl.*;
import org.lwjgl.glfw.*;
import org.lwjgl.opengl.*;

import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.system.MemoryUtil.*;
import static org.lwjgl.opengl.GL15.*;

public class LWJGLTest {

    private GLFWErrorCallback errorCallback;
    private GLFWKeyCallback   keyCallback;

    private long window;

    public void run() {

        try {
            init();
            loop();

            glfwDestroyWindow(window);
            keyCallback.release();
        } finally {

            glfwTerminate();
            errorCallback.release();
        }
    }

    int WIDTH = 300;
    int HEIGHT = 300;

    private void init() {

        glfwSetErrorCallback(errorCallback = GLFWErrorCallback.createPrint(System.err));

        if ( glfwInit() != GLFW_TRUE )
            throw new IllegalStateException("Unable to initialize GLFW");

        glfwDefaultWindowHints();
        glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
        glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE);

        window = glfwCreateWindow(WIDTH, HEIGHT, "Hello World!", NULL, NULL);
        if ( window == NULL )
            throw new RuntimeException("Failed to create the GLFW window");

        glfwSetKeyCallback(window, keyCallback = new GLFWKeyCallback() {
            @Override
            public void invoke(long window, int key, int scancode, int action, int mods) {
                if ( key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE )
                    glfwSetWindowShouldClose(window, GLFW_TRUE);
            }
        });

        GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());

        glfwSetWindowPos(
            window,
            (vidmode.width() - WIDTH) / 2,
            (vidmode.height() - HEIGHT) / 2
        );

        glfwMakeContextCurrent(window);
        glfwSwapInterval(1);

        glfwShowWindow(window);
    }

    private void loop() {
        GL.createCapabilities();

        glClearColor(1.0f, 1.0f, 1.0f, 0.0f);

        while ( glfwWindowShouldClose(window) == GLFW_FALSE ) {
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

            draw();

            glfwSwapBuffers(window);

            glfwPollEvents();
        }
    }

    private static void draw(){

        int vertices = 4;
        int colorSize = 3;
        int vertexSize = 3;

        FloatBuffer cBuffer = BufferUtils.createFloatBuffer(vertices * colorSize);
        cBuffer.put(0).put(0).put(0);
        cBuffer.put(0).put(0).put(0);
        cBuffer.put(0).put(0).put(0);
        cBuffer.put(0).put(0).put(0);
        cBuffer.flip();

        FloatBuffer vBuffer = BufferUtils.createFloatBuffer(vertices * vertexSize);
        vBuffer.put(0.4056f).put(0.5792f).put(0.0f);
        vBuffer.put(-0.5792f).put(0.4056f).put(0.0f);
        vBuffer.put(-0.4056f).put(-0.5792f).put(0.0f);
        vBuffer.put(0.5792f).put(-0.4056f).put(0.0f);
        vBuffer.flip();



        IntBuffer ib = BufferUtils.createIntBuffer(2);

        glGenBuffers(ib);

        int vHandle = ib.get(0);
        int cHandle = ib.get(1);

        glEnableClientState(GL_VERTEX_ARRAY);
        glEnableClientState(GL_COLOR_ARRAY);

        glBindBuffer(GL_ARRAY_BUFFER, vHandle);
        glBufferData(GL_ARRAY_BUFFER, vBuffer, GL_STATIC_DRAW);
        glVertexPointer(vertexSize, GL_FLOAT, vertexSize*4, 0);

        glBindBuffer(GL_ARRAY_BUFFER, cHandle);
        glBufferData(GL_ARRAY_BUFFER, cBuffer, GL_STATIC_DRAW);
        glColorPointer(colorSize, GL_FLOAT, colorSize*4, 0);

        glDrawArrays(GL_POLYGON, 0, vertices);

        glBindBuffer(GL_ARRAY_BUFFER, 0);

        glDisableClientState(GL_COLOR_ARRAY);
        glDisableClientState(GL_VERTEX_ARRAY);

        ib.put(0, vHandle);
        ib.put(1, cHandle);
        glDeleteBuffers(ib);

    }

    public static void main(String[] args){

        new LWJGLTest().run();

    }

}

Answer 1

您可以在GLFW中启用多重采样（MSAA），它可以为您提供所需的效果。在其上使用 GL_SAMPLES 进行查找。

e.g。

glfwWindowHint(GLFW_STENCIL_BITS, 4);
glfwWindowHint(GLFW_SAMPLES, 4);

在创建窗口之前。

LWJGL 3中的抗锯齿

1 个答案: