Question

我是DirectX的初学者，并且正在研究 Minecraft克隆 / 体素引擎。我正在尝试在RenderFrame函数内渲染一定数量的多维数据集。我注意到的是，一旦渲染了数千个，性能就会迅速下降（我得到的fps在5到10之间）。需要什么样的优化？注意，我只对一个多维数据集使用单个顶点缓冲区，然后对其他所有多维数据集应用转换。这是不好的做法吗？这是代码：

// flexible vertex format that I'm using
struct CUSTOMVERTEX {
    FLOAT X, Y, Z;
    D3DVECTOR NORMAL;
};
#define CUSTOMFVF (D3DFVF_XYZ | D3DFVF_NORMAL)
void render_frame(void)
{
    // ...  view transform ...

    // ... projection transform ...

    // world transform
    d3ddev->SetStreamSource(0, v_buffer, 0, sizeof(CUSTOMVERTEX));
    d3ddev->SetIndices(i_buffer);

    for (int i = 0; i != 4096; ++i)
    {
        // ... translation for every cube ...
        d3ddev->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 24, 0, 12);
    }
}

void setup_scene(void)
{
    CUSTOMVERTEX vertices[] =
    {
        { -3.0f, -3.0f, 3.0f, 0.0f, 0.0f, 1.0f, },    // side 1
        { 3.0f, -3.0f, 3.0f, 0.0f, 0.0f, 1.0f, },
        { -3.0f, 3.0f, 3.0f, 0.0f, 0.0f, 1.0f, },
        { 3.0f, 3.0f, 3.0f, 0.0f, 0.0f, 1.0f, },

        { -3.0f, -3.0f, -3.0f, 0.0f, 0.0f, -1.0f, },    // side 2
        { -3.0f, 3.0f, -3.0f, 0.0f, 0.0f, -1.0f, },
        { 3.0f, -3.0f, -3.0f, 0.0f, 0.0f, -1.0f, },
        { 3.0f, 3.0f, -3.0f, 0.0f, 0.0f, -1.0f, },

        { -3.0f, 3.0f, -3.0f, 0.0f, 1.0f, 0.0f, },    // side 3
        { -3.0f, 3.0f, 3.0f, 0.0f, 1.0f, 0.0f, },
        { 3.0f, 3.0f, -3.0f, 0.0f, 1.0f, 0.0f, },
        { 3.0f, 3.0f, 3.0f, 0.0f, 1.0f, 0.0f, },

        { -3.0f, -3.0f, -3.0f, 0.0f, -1.0f, 0.0f, },    // side 4
        { 3.0f, -3.0f, -3.0f, 0.0f, -1.0f, 0.0f, },
        { -3.0f, -3.0f, 3.0f, 0.0f, -1.0f, 0.0f, },
        { 3.0f, -3.0f, 3.0f, 0.0f, -1.0f, 0.0f, },

        { 3.0f, -3.0f, -3.0f, 1.0f, 0.0f, 0.0f, },    // side 5
        { 3.0f, 3.0f, -3.0f, 1.0f, 0.0f, 0.0f, },
        { 3.0f, -3.0f, 3.0f, 1.0f, 0.0f, 0.0f, },
        { 3.0f, 3.0f, 3.0f, 1.0f, 0.0f, 0.0f, },

        { -3.0f, -3.0f, -3.0f, -1.0f, 0.0f, 0.0f, },    // side 6
        { -3.0f, -3.0f, 3.0f, -1.0f, 0.0f, 0.0f, },
        { -3.0f, 3.0f, -3.0f, -1.0f, 0.0f, 0.0f, },
        { -3.0f, 3.0f, 3.0f, -1.0f, 0.0f, 0.0f, },
    };

    // create a vertex buffer interface called v_buffer
    d3ddev->CreateVertexBuffer(
        24 * sizeof(CUSTOMVERTEX),
        0,
        CUSTOMFVF,
        D3DPOOL_MANAGED,
        &v_buffer,
        NULL
    );

    VOID* pVoid;

    // lock v_buffer and load the vertices into it
    v_buffer->Lock(0, 0, (void**)& pVoid, 0);
    memcpy(pVoid, vertices, sizeof(vertices));
    v_buffer->Unlock();

    // create the indices using an int array
    short indices[] =
    {
        0, 1, 2,    // side 1
        2, 1, 3,
        4, 5, 6,    // side 2
        6, 5, 7,
        8, 9, 10,    // side 3
        10, 9, 11,
        12, 13, 14,    // side 4
        14, 13, 15,
        16, 17, 18,    // side 5
        18, 17, 19,
        20, 21, 22,    // side 6
        22, 21, 23,
    };

    // create an index buffer interface
    d3ddev->CreateIndexBuffer(
        36 * sizeof(short),
        0,
        D3DFMT_INDEX16,
        D3DPOOL_MANAGED,
        &i_buffer,
        NULL
    );

    // lock i_buffer and load the indices into it
    i_buffer->Lock(0, 0, (void**)& pVoid, 0);
    memcpy(pVoid, indices, sizeof(indices));
    i_buffer->Unlock();
}

绘制数千个多维数据集时性能不佳

0 个答案: