java - 顶点着色器上的 openGL GLSL "void"解析错误

Question

所以我正在关注“theBennyBox”关于 3d 游戏引擎的 Youtube 系列，大约在第 9/10 集中，我遇到了一些问题。

我得到了错误

Vertex shader failed to compile with the following errors: ERROR: 0:5: error(#132) Syntax error: "void" parse error ERROR: error(#273) 1 compilation errors. No code generated

这是我所有的东西:

我的资源加载器(读取文件)

package com.base.engine;

import java.io.BufferedReader;
import java.io.FileReader;

public class ResourceLoader {
    public static String loadShader(String fileName) {
        StringBuilder shaderSource = new StringBuilder();
        BufferedReader shaderReader = null;

        try {
            shaderReader = new BufferedReader(new FileReader("./res/shaders/" + fileName));
            String line;
            while ((line = shaderReader.readLine()) != null) {
                shaderSource.append(line).append("\n");
            }

            shaderReader.close();
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }

        return shaderSource.toString();
    }
}

我的着色器类:

package com.base.engine;

import static org.lwjgl.opengl.GL20.*;
import static org.lwjgl.opengl.GL32.*;

public class Shader {
    private int program;

    public Shader() {
        program = glCreateProgram();

        if (program == 0) {
            System.err.println("Shader Creation failed: could not find valid memory location in constructor");
            System.exit(1);
        }
    }

    public void bind(){
        glUseProgram(program); 
    }

    public void addVertexShader(String text) {
        addProgram(text, GL_VERTEX_SHADER);
    }

    public void addGeometryShader(String text) {
        addProgram(text, GL_GEOMETRY_SHADER);
    }

    public void addFragmentShader(String text) {
        addProgram(text, GL_FRAGMENT_SHADER);
    }

    public void compileShader() {
        glLinkProgram(program);

        if (glGetProgrami(program, GL_LINK_STATUS) == 0) {
            System.err.println(glGetShaderInfoLog(program, 1024));
            System.exit(1);
        }

        glValidateProgram(program);
        if(glGetProgrami(program, GL_VALIDATE_STATUS) == 0){
            System.err.println(glGetShaderInfoLog(program, 1024));
            System.exit(1);
        }
    }

    private void addProgram(String text, int type) {
        int shader = glCreateShader(type);

        if (shader == 0) {
            System.err.println("Shader Creation failed: could not find valid memory location when adding shader");
            System.exit(1);
        }

        glShaderSource(shader, text);
        glCompileShader(shader);

        if (glGetShaderi(shader, GL_COMPILE_STATUS) == 0) {
            System.err.println(glGetShaderInfoLog(shader, 1024));
            System.exit(1);
        }

        glAttachShader(program, shader);
    }
}

我将着色器初始化为单个多边形的游戏类:

package com.base.engine;

import org.lwjgl.input.Keyboard;

public class Game {
    private Mesh mesh;
    private Shader shader;

    public Game() {
        mesh = new Mesh();
        shader = new Shader();

        Vertex[] data = new Vertex[] {new Vertex(new Vector3f(-1, -1, 0)),
                                      new Vertex(new Vector3f(0, 1, 0)),
                                      new Vertex(new Vector3f(1, -1, 0))};
        mesh.addVertices(data);
        shader.addVertexShader(ResourceLoader.loadShader("basicVertex.vs"));
        shader.addFragmentShader(ResourceLoader.loadShader("basicFragment.fs"));

    }

    public void input() {
        if (Input.getKeyDown(Keyboard.KEY_UP)) {
            System.out.println("We've just pressed up");
        }
        if (Input.getKeyUp(Keyboard.KEY_UP)) {
            System.out.println("We've just released up");
        }

        if (Input.getMouseDown(1)) {
            System.out.println("We've just pressed right-mouse at "
                    + Input.getMousePosition().toString());
        }
        if (Input.getMouseUp(1)) {
            System.out.println("We've just released right-mouse");
        }
    }

    public void update() {

    }

    public void render() {
        shader.bind();
        mesh.draw();
    }
}

和我的着色器:(错误出现在顶点着色器上，但如果我注释掉顶点着色器，片段看起来就像什么都不做。)

顶点:(第 5 行，void main()，显然是麻烦制造者)

#version 330

layout (location = 0) in vec3 position

void main()
{
    gl_Position = vec4(0.25 * position, 1.0);
}

片段:

#version 330

out vec3 fragColour;

void main()
{
    fragColour = vec4(0.0, 1.0, 1.0, 1.0);
}

我很感激这一切很长，但如果你知道什么请帮助我!

Answer 1

除非是转录代码的拼写错误，否则您的顶点着色器中缺少分号。第 3 行是:

布局(location = 0)在vec3位置

应该是

布局(location = 0)在vec3位置；

关于

but if I comment out the vertex shader the fragment looks like it does nothing

每个着色器程序都至少需要一个顶点和片段/像素着色器。没有顶点着色器(当你注释掉它时)没有顶点被传递，这意味着没有生成图元，因此没有图元可以用你的片段着色器填充。