glEnableVertexAttribArray black background

[begin]

Sorry for my children's questions
There is simply no time for a specific library study.

Okey, I have problem with black ground in my demo game
When I put a different texture for the sky (I make the Skybox) the background is still black
I realized that this is due to this line:

normalAttribute = glGetAttribLocationARB(program, "aNormal");
        glEnableVertexAttribArrayARB(normalAttribute);

But I when tried remove her or change on glDisableVertexAttribArrayARB - I get it:



instead of the usual shadow.....

My methods with load program:

static int createShader(String resource, int type) throws IOException {
        int shader = glCreateShaderObjectARB(type);
        ByteBuffer source = ioResourceToByteBuffer(resource, 1024);
        PointerBuffer strings = BufferUtils.createPointerBuffer(1);
        IntBuffer lengths = BufferUtils.createIntBuffer(1);
        strings.put(0, source);
        lengths.put(0, source.remaining());
        glShaderSourceARB(shader, strings, lengths);
        glCompileShaderARB(shader);
        int compiled = glGetObjectParameteriARB(shader, GL_OBJECT_COMPILE_STATUS_ARB);
        String shaderLog = glGetInfoLogARB(shader);
        if (shaderLog.trim().length() > 0) {
            System.err.println(shaderLog);
        }
        if (compiled == 0) {
            throw new AssertionError("Could not compile shader");
        }
        return shader;
    }

    void createProgram() throws IOException {

        program = glCreateProgramObjectARB();
        int vertexShader = createShader("org/lwjgl/demo/opengl/assimp/magnet.vs",
                GL_VERTEX_SHADER_ARB);
        int fragmentShader = createShader("org/lwjgl/demo/opengl/assimp/magnet.fs",
                GL_FRAGMENT_SHADER_ARB);
        glAttachObjectARB(program, vertexShader);
        glAttachObjectARB(program, fragmentShader);
        glLinkProgramARB(program);
        int linkStatus = glGetObjectParameteriARB(program, GL_OBJECT_LINK_STATUS_ARB);
        String programLog = glGetInfoLogARB(program);
        if (programLog.trim().length() > 0) {
            System.err.println(programLog);
        }
        if (linkStatus == 0) {
            throw new AssertionError("Could not link program");
        }

        glUseProgramObjectARB(program);
        vertexAttribute = glGetAttribLocationARB(program, "aVertex");
        glEnableVertexAttribArrayARB(vertexAttribute);
        normalAttribute = glGetAttribLocationARB(program, "aNormal");
        glEnableVertexAttribArrayARB(normalAttribute);
        modelMatrixUniform = glGetUniformLocationARB(program, "uModelMatrix");
        viewProjectionMatrixUniform = glGetUniformLocationARB(program, "uViewProjectionMatrix");
        normalMatrixUniform = glGetUniformLocationARB(program, "uNormalMatrix");
        lightPositionUniform = glGetUniformLocationARB(program, "uLightPosition");
        viewPositionUniform = glGetUniformLocationARB(program, "uViewPosition");
        ambientColorUniform = glGetUniformLocationARB(program, "uAmbientColor");
        diffuseColorUniform = glGetUniformLocationARB(program, "uDiffuseColor");
        specularColorUniform = glGetUniformLocationARB(program, "uSpecularColor");
    }

Accordingly, when I add a new program (in this case, the skybox), nothing changes, and the background continues to be black.
I repeat. If I delete this line, the sky will appear, but the shadow of the model will disappear.

[begin]

And file magnet.vs

#version 110

attribute vec4 aVertex;
attribute vec3 aNormal;
uniform mat4 uModelMatrix;
uniform mat4 uViewProjectionMatrix;
uniform mat3 uNormalMatrix;
varying vec3 vPosition;
varying vec3 vNormal;

void main() {
    vec4 modelPosition = uModelMatrix * aVertex * vec4(0.1, 0.1, 0.1, 1.0);
    gl_Position = uViewProjectionMatrix * modelPosition;
    vPosition = modelPosition.xyz;
    vNormal = uNormalMatrix * aNormal;
}

[mudlee]

Just a humble, off-topic question. When you're writing "There is simply no time for a specific library study.", what do you mean? Do you have a deadline or whatever? I studied 2 years OpenGL and now I feel comfortable myself.

Getting into OpenGL quickly and expecting result that you really understand is tough. Also, you don't have to study LWJGL as it's a wrapper only, you have to study OpenGL itself.

[begin]

The term is. Less than 6 months. I do not think that I will learn at least half of the library in such a period of time, I just have a task in hand, which I need create.
Do not think that as soon as I haved a problem, I immediately go here. In fact, I can spend all my free time on this, but without finding a solution. But it is temporary, at the beginning of the study is always difficult.

So what about my mistake in this thread, can you help me? (Sorry for my bad language)

[mudlee]

Can you share your full code somewhere? I see minor stuff in the attached code snippets, but to be exact I need to see the whole stuff.

[begin]

This is my test code:

https://github.com/beegin/testDemo

[mudlee]

I pass this to someone, who has more than half an hour to investigate this. You wrote you have 6 month, I would spend the first month at least to go through on this tutorial: https://ahbejarano.gitbook.io/lwjglgamedev/

If you don't do this, you will hit walls every day.

[KaiHH]

In order for your code to work, you would need to make the following changes (unified diff format):

@@ -30,6 +30,7 @@ import static org.lwjgl.opengl.ARBShaderObjects.*;
 import static org.lwjgl.opengl.ARBVertexBufferObject.*;
 import static org.lwjgl.opengl.ARBVertexShader.GL_VERTEX_SHADER_ARB;
 import static org.lwjgl.opengl.ARBVertexShader.glEnableVertexAttribArrayARB;
+import static org.lwjgl.opengl.ARBVertexShader.glDisableVertexAttribArrayARB;
 import static org.lwjgl.opengl.ARBVertexShader.glGetAttribLocationARB;
 import static org.lwjgl.opengl.GL11.GL_LINEAR;
 import static org.lwjgl.opengl.GL11.GL_LINEAR_MIPMAP_LINEAR;
@@ -298,9 +299,7 @@ public class WavefrontObjDemo {
         glUseProgramObjectARB(cubemapProgram);
 
         vertexAttribute = glGetAttribLocationARB(program, "aVertex");
-        glEnableVertexAttribArrayARB(vertexAttribute);
         normalAttribute = glGetAttribLocationARB(program, "aNormal");
-        glEnableVertexAttribArrayARB(normalAttribute);
 
         modelMatrixUniform = glGetUniformLocationARB(program, "uModelMatrix");
         viewProjectionMatrixUniform = glGetUniformLocationARB(program, "uViewProjectionMatrix");
@@ -337,6 +336,7 @@ public class WavefrontObjDemo {
         viewMatrix.setLookAt(viewPosition.x, viewPosition.y, viewPosition.z, 0f, 0f, 0f, 0f, 1f,
                 0f);
         projectionMatrix.mul(viewMatrix, viewProjectionMatrix);
+        invViewProjMatrix.set(viewMatrix).setTranslation(0, 0, 0).mulLocal(projectionMatrix).invert(invViewProjMatrix);
 
         glUseProgramObjectARB(cubemapProgram);
         glUniformMatrix4fv(cubemap_invViewProjUniform, false, invViewProjMatrix.get(matrixBuffer));
@@ -354,7 +354,8 @@ public class WavefrontObjDemo {
         drawCubemap();
 
         glUseProgram(program);
-
+        glEnableVertexAttribArrayARB(vertexAttribute);
+        glEnableVertexAttribArrayARB(normalAttribute);
         for (Model.Mesh mesh : model.meshes) {
 
             glBindBuffer(GL_ARRAY_BUFFER, mesh.vertexArrayBuffer);
@@ -381,6 +382,8 @@ public class WavefrontObjDemo {
             glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.elementArrayBuffer);
             glDrawElements(GL_TRIANGLES, mesh.elementCount, GL_UNSIGNED_INT, 0);
         }
+        glDisableVertexAttribArrayARB(vertexAttribute);
+        glDisableVertexAttribArrayARB(normalAttribute);
     }

But I also share the point of mudlee. You seem to be taking on a task which is way over your head and you must spend some more time learning OpenGL.
What you are currently doing is just stitching some snippets from lwjgl3-demos programs together and expecting that to work.

[begin]

Thanks, it helped me.
Sorry for the big wait.
I followed your advice and am already studying the library at the root.