如何在 LWJGL 中将浮点数组传递给着色器

Question

我一直在关注 LWJGL 网站 (http://wiki.lwjgl.org/wiki/GLSL_Tutorial:_Communicating_with_Shaders.html) to try to send an array of random floats to my fragment shader, but every value in the shader was 0. I tried copy-pasting the "arrayOfInts" example to try and isolate the problem, changing everything to be ints, but I still only get zeros shader-side. According to the documentation ( https://javadoc.lwjgl.org/org/lwjgl/opengl/GL20.html#glUniform1iv(int,int%5B%5D) ) 上的教程，函数 glUniform1iv 存在并且可以满足我的需要，但是当我尝试它时 Eclipse 告诉我它不存在于class GL20，当使用 int[] 或 IntBuffer 时，同样适用于 glUniform1fv。统一变量的位置为 0，因此已正确加载。存储在生成的 java 数组中的值是正确的。

顶点着色器：

#version 400 core

in vec3 position;
out vec2 uvPosition;

void main(void){
    gl_Position = vec4(position, 1.0);
    uvPosition = (position.xy+vec2(1.0, 1.0))/2;
}

片段着色器

#version 400 core

in vec2 uvPosition;
out vec4 outColor;

uniform int random[50];

int randomIterator = 0;

float randf(){
    return random[randomIterator++];
}

void main(void){
    outColor = vec4(random[0]/10, 1.0, 1.0, 1.0);
}

Java 我加载制服的代码：

    final int RAND_AMOUNT = 50;
    IntBuffer buffer = BufferUtils.createIntBuffer(RAND_AMOUNT);
    int[] array = new int[RAND_AMOUNT];
    for(int i = 0; i < RAND_AMOUNT; i++) {
        buffer.put((int)(Math.random()*9.999f));
        array[i] = (int)(Math.random()*9.999f);
    }
    buffer.rewind();
    System.out.println(buffer.get(0));
    GL20.glUniform1(glGetUniformLocation(programID, "random"), buffer); //In this line, using GL20.glUniform1iv tells me it doesn't exist. Same with

没有任何错误，显示为青色，这意味着红色分量为 0。任何帮助生成随机整数或直接发送随机浮点数的帮助都会有所帮助。欢迎提问。

Answer 1

glUniform* sets a value of a uniform in the default uniform block of the currently installed program. Thus the program has to be installed by glUseProgram之前。

int random_loc = GL20.glGetUniformLocation(programID, "random")

GL20.glUseProgram(programID);
GL20.glUniform1(random_loc, buffer);

如何在 LWJGL 中将浮点数组传递给着色器

How to pass an array of float to Shader in LWJGL

java

opengl-es

glsl

lwjgl