2

我有用两种不同语言编写的 SpriteBatch 版本：

Java： http: //pastebin.com/7gwHBTXi C#： http: //pastebin.com/cTFn26H8

它们具有相同的代码，并且都在一个简单的程序中进行以下调用：

爪哇：

    GL11.glViewport(0, 0, game.getWidth(), game.getHeight());
    GL11.glClearColor(0, 1, 0, 1);
    GL11.glClearDepth(1.0);
    GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);

    sb.Begin();
    sb.Draw(tex, new Vector2(-0.5f, 0.5f), new Vector2(1, -1), Color.White, 0);
    sb.End(SpriteSortMode.None);
    sb.RenderBatch(new Matrix4(), new Matrix4(), BlendState.Opaque, SamplerState.PointWrap, DepthState.None, RasterizerState.CullNone);

C＃：

    GL.Viewport(0, 0, game.Width, game.Height);
    GL.ClearColor(0, 1, 0, 1);
    GL.ClearDepth(1.0);
    GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);

    sb.Begin();
    sb.Draw(tex, new Vector2(-0.5f, 0.5f), new Vector2(1, -1), Color.White);
    sb.End(SpriteSortMode.None);
    sb.RenderBatch(Matrix4.Identity, Matrix4.Identity, BlendState.Opaque, SamplerState.PointWrap, DepthState.None, RasterizerState.CullNone);

它们的 OpenGL 上下文完全相同（3.3）。

但是，C# 版本做了它应该做的事情（绘制一个白色矩形），但 Java 版本什么都不做（只有绿色背景）。谁能告诉我有什么区别？什么不工作？谢谢你。我已经坚持了三个星期。

4

1 回答 1

1

So, I've found the problem actually. It has to do with the way Java manages memory and the fact that Java is a bunch of garbage in that respect. The reason it works in C# and not in Java is because C# gives access to pointers whereas the closest thing that Java has are the NIO Buffers. In order for OpenGL calls to work, physical pointers must be supplied, but Buffers can supply either physical or virtual based on how they are constructed. In short, replacing "ByteBuffer.allocateDirect" with "BufferUtils.createByteBuffer" fixes the problem. Although, I would rather see Java be fixed instead :P.

    private void GenerateBatches() {
        if(glyphs.size() < 1) return;

        // Create Arrays
        ByteBuffer bb = BufferUtils.createByteBuffer(6 * glyphs.size() * VertexSpriteBatch.Size);
        SpriteBatchCall call = new SpriteBatchCall(0, glyphs.get(0).Texture, batches);
        glyphs.get(0).VTL.AppendToBuffer(bb);
        glyphs.get(0).VTR.AppendToBuffer(bb);
        glyphs.get(0).VBL.AppendToBuffer(bb);
        glyphs.get(0).VBL.AppendToBuffer(bb);
        glyphs.get(0).VTR.AppendToBuffer(bb);
        glyphs.get(0).VBR.AppendToBuffer(bb);
        emptyGlyphs.add(glyphs.get(0));

        int gc = glyphs.size();
        for(int i = 1; i < gc; i++) {
            SpriteGlyph glyph = glyphs.get(i);
            call = call.Append(glyph, batches);
            glyph.VTL.AppendToBuffer(bb);
            glyph.VTR.AppendToBuffer(bb);
            glyph.VBL.AppendToBuffer(bb);
            glyph.VBL.AppendToBuffer(bb);
            glyph.VTR.AppendToBuffer(bb);
            glyph.VBR.AppendToBuffer(bb);
            emptyGlyphs.add(glyphs.get(i));
        }
        bb.flip();
        glyphs = null;

        // Set The Buffer Data
        glBindBuffer(BufferTarget.ArrayBuffer, vbo);
        if(gc > glyphCapacity) {
            glyphCapacity = gc * 2;
            glBufferData(
                    BufferTarget.ArrayBuffer,
                    (glyphCapacity * 6) * VertexSpriteBatch.Size,
                    bufUsage
                    );
        }
        glBufferSubData(BufferTarget.ArrayBuffer, 0, bb);
        GLBuffer.Unbind(BufferTarget.ArrayBuffer);
    }
于 2014-07-15T16:36:43.387 回答