着色器不工作

Question

好的，我创建了一个屏幕大小的三角形，它工作得非常好。现在我想添加一些着色器 有很酷的效果。下面是代码和着色器文件，展示了我是如何做到的。但问题是它不起作用，另一个大问题是任何方法都没有抛出任何异常。 意味着它已经编译，附加和链接没有问题......或者我可能在这里错了。 我正在使用 openGL 4.2.0 - Build 10.18.10.3496

// inside the Game class constructor I called
shader.addFragmentShader(ResourceLoader.getShaderResource("basicFragment.fs.txt"));
shader.addVertexShader(ResourceLoader.getShaderResource("basicVertex.vs.txt"));
shader.getReadyShader();

public static String getShaderResource(String fileName){

shaderSource=new StringBuilder();
BufferedReader shaderReader=null;

try{
File readFile=new File("./Res/Shader/"+fileName);
shaderReader=new BufferedReader(new FileReader(readFile));
String line;

try {

while((line=shaderReader.readLine())!=null){
shaderSource.append(line).append("\n");

}
shaderReader.close();

} catch (IOException e) {
e.printStackTrace();
}
}

catch(FileNotFoundException exp){
exp.printStackTrace();
System.err.println("couldn't load the shader file");
}

return shaderSource.toString();
}


public class ShaderLoader {

private static int program;
public ShaderLoader(){
program=glCreateProgram();

if(program==0){
System.out.println("Shader creation failed: could not find the valid address.");
}
}

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

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

public void getReadyShader(){
glLinkProgram(program);

if(glGetProgram(program, GL_LINK_STATUS)==0){
System.out.println(glGetShaderInfoLog(program,1024));
}

glValidateProgram(program);

if(glGetProgram(program, GL_VALIDATE_STATUS)==0){
System.out.println(glGetShaderInfoLog(program,1024));
}
}


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

if(shader==0){
System.err.println("Couldn't find the valid shader source");
    }
glShaderSource(shader,text);

glCompileShader(shader);

 if(glGetShader(shader,GL_COMPILE_STATUS)==0){
 System.err.println(glGetShaderInfoLog(shader,1024));
}
glAttachShader(program,shader);
}


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

 vertexShader

#version 420 (tried with #version 330 but still no effect)
layout (location=0) in vec3 position;

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

fragment shader
#version 420 (tried with #version 330 but still no effect)
out vec4 fragColor;

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

Why I am not having any effect? please help..

Answer 1

您正在混淆着色器类型：

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

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

对于片段着色器，glShaderSource() 的参数需要为 GL_FRAGMENT_SHADER，而您的代码通过 GL_VERTEX_SHADER。

Answer 2

哦，我弄错了，这是因为学习到凌晨 5 点的教程。

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

public void addFragmentShader(String text){
addProgram(text, GL_VERTEX_SHADER);(here should be GL_FRAGMENT_SHADER as a second argument)
}

sorry for such stupid question and wasting your time.....