OpenGL Vertex Buffer not drawing（LWJGL）

我一直在尝试实现一种更好的绘图方式，并尝试使用Vertex Buffers。现在，我一直在关注的教程，但它对我不起作用，它根本没有绘制（据我所知）。如果我用glVertex3d()来代替，所有的都正常。OpenGL Vertex Buffer not drawing（LWJGL）

这是它的样子：

import static org.lwjgl.opengl.GL11.*; 
import static org.lwjgl.opengl.GL12.*; 

import java.nio.FloatBuffer; 
import java.nio.IntBuffer; 

import org.lwjgl.BufferUtils; 
import org.lwjgl.opengl.ARBVertexBufferObject; 
import org.lwjgl.opengl.GLContext; 

public abstract class Shape { 

public void render() 
{ 
    if(vertexBufferID > 0 && indexBufferID > 0) 
    { 
     glEnableClientState(GL_VERTEX_ARRAY); 
     ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, vertexBufferID); 
     glVertexPointer(3, GL_FLOAT, 0, 0); 

     if(colorBufferID > 0) 
     { 
      glEnableClientState(GL_COLOR_ARRAY); 
      ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, colorBufferID); 
      glColorPointer(4, GL_FLOAT, 0, 0); 
     } 

     if(textureCoordBufferID > 0) 
     { 
      glEnableClientState(GL_TEXTURE_COORD_ARRAY); 
      ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, textureCoordBufferID); 
      glColorPointer(2, GL_FLOAT, 0, 0); 
     } 

     if(normalBufferID > 0) 
     { 
      glEnableClientState(GL_NORMAL_ARRAY); 
      ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, normalBufferID); 
      glNormalPointer(GL_FLOAT, 0, 0); 
     } 

     ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ELEMENT_ARRAY_BUFFER_ARB, indexBufferID); 
     glDrawRangeElements(drawMode, 0, verticesNumber, verticesNumber, 
          GL_UNSIGNED_INT, 0); 

     glDisableClientState(GL_VERTEX_ARRAY); 
     glDisableClientState(GL_COLOR_ARRAY); 
     glDisableClientState(GL_TEXTURE_COORD_ARRAY); 
     glDisableClientState(GL_NORMAL_ARRAY); 
    } 
} 

public static int createVBOID() 
{ 
     if (GLContext.getCapabilities().GL_ARB_vertex_buffer_object) { 
     IntBuffer buffer = BufferUtils.createIntBuffer(1); 
     ARBVertexBufferObject.glGenBuffersARB(buffer); 
     return buffer.get(0); 
     } 
     return 0; 
} 

public static void bufferData(int id, FloatBuffer buffer) 
{ 
     if (GLContext.getCapabilities().GL_ARB_vertex_buffer_object) 
     { 
      ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, id); 
      ARBVertexBufferObject.glBufferDataARB(ARBVertexBufferObject.GL_ARRAY_BUFFER_ARB, buffer, ARBVertexBufferObject.GL_STATIC_DRAW_ARB); 
     } 
} 

public static void bufferElementData(int id, IntBuffer buffer) 
{ 
    if (GLContext.getCapabilities().GL_ARB_vertex_buffer_object) 
    { 
     ARBVertexBufferObject.glBindBufferARB(ARBVertexBufferObject.GL_ELEMENT_ARRAY_BUFFER_ARB, id); 
     ARBVertexBufferObject.glBufferDataARB(ARBVertexBufferObject.GL_ELEMENT_ARRAY_BUFFER_ARB, buffer, ARBVertexBufferObject.GL_STATIC_DRAW_ARB); 
    } 
} 

@Override 
protected void finalize() throws Throwable 
{ 
    if(vertexBufferID > 0) ARBVertexBufferObject.glDeleteBuffersARB(vertexBufferID); 
    if(colorBufferID > 0) ARBVertexBufferObject.glDeleteBuffersARB(colorBufferID); 
    if(textureCoordBufferID > 0) ARBVertexBufferObject.glDeleteBuffersARB(textureCoordBufferID); 
    if(indexBufferID > 0) ARBVertexBufferObject.glDeleteBuffersARB(indexBufferID); 

    super.finalize(); 
} 

protected int verticesNumber; 
protected int drawMode; 

protected int vertexBufferID; 
protected int colorBufferID; 
protected int textureCoordBufferID; 
protected int normalBufferID; 
protected int indexBufferID; 
}

类和子类，实际上填补了内容：

import java.nio.FloatBuffer; 
import java.nio.IntBuffer; 

import org.lwjgl.BufferUtils; 
import org.lwjgl.opengl.GL11; 

public class ShapeCube extends Shape{ 

public ShapeCube() 
{  
    drawMode = GL11.GL_QUADS; 

    verticesNumber = 6 * 4; 

    FloatBuffer vertices = BufferUtils.createFloatBuffer(verticesNumber * 3); 
    IntBuffer indices = BufferUtils.createIntBuffer(verticesNumber); 

    for(float x = -0.5F; x < 1; x++) for(float y = -0.5F; y < 1; y++) for(float z = -0.5F; z < 1; z++) 
    { 
     vertices.put(new float[]{x, y, z}); 
    } 

    indices.put(new int[]{0, 1, 2, 3, 4, 5, 6, 7}); 
    indices.put(new int[]{0, 1, 4, 5, 2, 3, 6, 7}); 
    indices.put(new int[]{0, 2, 4, 6, 1, 3, 5, 7}); 

    vertexBufferID = createVBOID(); 
    bufferData(vertexBufferID, vertices); 

    indexBufferID = createVBOID(); 
    bufferElementData(indexBufferID, indices); 
} 
}

正如我所说的，这个代码不画任何东西（我可以看到）为了我。我确定我在正确的位置调用了正确的代码，并且它应该绘制一个简单的彩色立方体。我很确定我必须错过简单的东西，但我没有任何Vertex Buffer对象的使用经验。

来源

2011-10-07 Ivorius

我现在已经找到了答案。对于每个人都想知道，我一直使用的缓冲区的位置必须设置为零。那么它的作品完美:)

来源

2011-10-08 22:10:35 Ivorius

OpenGL Vertex Buffer not drawing（LWJGL）

回答

相关问题