Java LWGJL opengl 缓冲区数据

Question

我有一个 class 代表我四边形的所有数据，每个 class 都有一个位置和一种颜色。我如何将 class 的数组传递给 opengl？我试过这个：

GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, VBO);

GL15.glBufferData(VBO, MAX_QUADS, GL15.GL_DYNAMIC_DRAW);
ByteBuffer data = GL15.glMapBuffer(GL15.GL_ARRAY_BUFFER, GL15.GL_WRITE_ONLY, null);

GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);

但现在我不知道如何将数组解析为字节以便传递给 GPU。这是数组：

Quad.Data[] vertexData = new Quad.Data[MAX_QUADS];

这是 class 的位置和颜色：

public class Data {
    public Vector3f position;
    public Vector4f color;
}

Answer 1

您可以将数据的浮点值 Class 放入 FloatBuffer 中，然后使用 glBufferData() 或 glBufferSubData（如果已分配缓冲区）将其传递给 OpenGL。

使用您的代码，它看起来类似于：

//Creating the FloatBuffer and store the Data
//n = number of floats you want to store, in this case 7 for each Quad;
FloatBuffer buffer = MemoryUtil.memAllocFloat(n);

//Do this for each "Data", thus for each Vertex of your Quad
buffer.put(position.x).put(position.y).put(position.z).put(color.r).put(color.g).put(color.b).put(color.a);
//Don't forget flipping the Buffer before passing it to OpenGL, otherwise you will get an EXCEPTION_ACCESS_VIOLATION
buffer.flip();

//Binding the VBO and allocate it
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER);
GL15.glBufferData(VBO, MAX_QUADS, GL15.GL_DYNAMIC_DRAW);

//Sending the Buffer to OpenGL
GL15.glBufferSubData(0, buffer);

//Unbind the Buffer
GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);

Java LWGJL opengl 缓冲区数据

Java LWGJL opengl Buffer Data

java

opengl

lwjgl