带缓冲的glDrawArrays在JOGL中不起作用

问题描述

我想知道是否有人可以帮助我找出为什么我的JOGL代码没有显示三角形的原因.出于某些原因也没有例外.我想念什么吗?

I was wondering whether someone can help me find out why my JOGL code does not show a triangle. There are no exceptions for some reason. Am I missing something?

    IntBuffer vacantNameBuffer = IntBuffer.allocate(3);
    gl.glGenBuffers(1, vacantNameBuffer);
        int vertexBufferName = vacantNameBuffer.get();
    float[] triangleArray = {
            -1.0f, -1.0f, 0.0f,
            1.0f, -1.0f, 0.0f,
            0.0f, 1.0f, 0.0f
    };

    FloatBuffer triangleVertexBuffer = FloatBuffer.wrap(triangleArray);
    gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, vacantNameBuffer.get());
    gl.glBufferData(
            GL2.GL_ARRAY_BUFFER, 
            triangleVertexBuffer.capacity() * Buffers.SIZEOF_FLOAT, 
            triangleVertexBuffer, 
            GL2.GL_STATIC_DRAW);
    gl.glEnableVertexAttribArray(vacantNameBuffer.get());
    gl.glVertexAttribPointer(0, 3, GL2.GL_FLOAT, false, 0, 0);
    gl.glDrawArrays(GL2.GL_TRIANGLES, 0, 3);
    gl.glDisableVertexAttribArray(vacantNameBuffer.get());
    gl.glFlush();

推荐答案

glEnableVertexAttribArray需要属性位置(您设置为glVertexAttribPointer的第一个参数的数字)，因此应将其更改为:

glEnableVertexAttribArray expects the attribute location (the number you set as first parameter of glVertexAttribPointer) so you should change it to:

gl.glEnableVertexAttribArray(0);
gl.glVertexAttribPointer(0, 3, GL2.GL_FLOAT, false, 0, 0);
gl.glDrawArrays(GL2.GL_TRIANGLES, 0, 3);
gl.glDisableVertexAttribArray(0);

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