我有一个类,代表我四边形的所有数据,每个类都有一个位置和一种颜色。我如何将该类的数组传递给opengl?我尝试了这个:
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);
但是现在我不知道如何将数组解析为字节,因此无法传递给GPU。这是数组:
Quad.Data[] vertexData = new Quad.Data[MAX_QUADS];
这是带有位置和颜色的类:
public class Data {
public Vector3f position;
public Vector4f color;
}
您可以将数据类的浮点值放在FloatBuffer中,然后使用glBufferData()或glBufferSubData(如果已经分配了缓冲区)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);
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