renderdoc/util/test/demos/d3d11/d3d11_primitive_restart.cpp

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 * Copyright (c) 2018-2026 Baldur Karlsson
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#include "d3d11_test.h"

RD_TEST(D3D11_Primitive_Restart, D3D11GraphicsTest)
{
  static constexpr const char *Description =
      "Test of primitive restart in triangle strips with -1 index";

  int main()
  {
    // initialise, create window, create device, etc
    if(!Init())
      return 3;

    ID3DBlobPtr vsblob = Compile(D3DDefaultVertex, "main", "vs_5_0");
    ID3DBlobPtr psblob = Compile(D3DDefaultPixel, "main", "ps_5_0");

    CreateDefaultInputLayout(vsblob);

    ID3D11VertexShaderPtr vs = CreateVS(vsblob);
    ID3D11PixelShaderPtr ps = CreatePS(psblob);

    DefaultA2V strip[] = {
        {Vec3f(-0.8f, 0.2f, 0.0f), Vec4f(0.0f, 1.0f, 0.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(-0.8f, 0.7f, 0.0f), Vec4f(0.0f, 1.0f, 0.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(-0.4f, 0.2f, 0.0f), Vec4f(0.0f, 1.0f, 0.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(-0.4f, 0.7f, 0.0f), Vec4f(0.0f, 1.0f, 0.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(0.0f, 0.2f, 0.0f), Vec4f(0.0f, 1.0f, 0.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(0.0f, 0.7f, 0.0f), Vec4f(0.0f, 1.0f, 0.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(0.4f, 0.2f, 0.0f), Vec4f(0.0f, 1.0f, 0.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(0.4f, 0.7f, 0.0f), Vec4f(0.0f, 1.0f, 0.0f, 1.0f), Vec2f(0.0f, 0.0f)},

        {Vec3f(-0.8f, -0.7f, 0.0f), Vec4f(0.0f, 0.0f, 1.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(-0.8f, -0.2f, 0.0f), Vec4f(0.0f, 0.0f, 1.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(-0.4f, -0.7f, 0.0f), Vec4f(0.0f, 0.0f, 1.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(-0.4f, -0.2f, 0.0f), Vec4f(0.0f, 0.0f, 1.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(0.0f, -0.7f, 0.0f), Vec4f(0.0f, 0.0f, 1.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(0.0f, -0.2f, 0.0f), Vec4f(0.0f, 0.0f, 1.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(0.4f, -0.7f, 0.0f), Vec4f(0.0f, 0.0f, 1.0f, 1.0f), Vec2f(0.0f, 0.0f)},
        {Vec3f(0.4f, -0.2f, 0.0f), Vec4f(0.0f, 0.0f, 1.0f, 1.0f), Vec2f(0.0f, 0.0f)},
    };

    ID3D11BufferPtr vb = MakeBuffer().Vertex().Data(strip);

    uint16_t idx[] = {
        // strip 0
        0,
        1,
        2,
        3,
        4,
        5,
        6,
        7,

        // restart
        0xffff,

        // strip 1
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15,
    };

    ID3D11BufferPtr ib = MakeBuffer().Index().Data(idx);

    uint16_t idx2[] = {
        // strip 0
        10,
        11,
        12,
        13,
        14,
        15,
        16,
        17,

        // restart
        0xffff,

        // strip 1
        18,
        19,
        20,
        21,
        22,
        23,
        24,
        25,
    };

    ID3D11BufferPtr ib2 = MakeBuffer().Index().Data(idx2);

    while(Running())
    {
      ClearRenderTargetView(bbRTV, {0.2f, 0.2f, 0.2f, 1.0f});

      IASetVertexBuffer(vb, sizeof(DefaultA2V), 0);
      ctx->IASetIndexBuffer(ib, DXGI_FORMAT_R16_UINT, 0);
      ctx->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
      ctx->IASetInputLayout(defaultLayout);

      ctx->VSSetShader(vs, NULL, 0);
      ctx->PSSetShader(ps, NULL, 0);

      RSSetViewport({0.0f, 0.0f, (float)screenWidth, (float)screenHeight, 0.0f, 1.0f});

      ctx->OMSetRenderTargets(1, &bbRTV.GetInterfacePtr(), NULL);

      ctx->DrawIndexed(17, 0, 0);

      ClearRenderTargetView(bbRTV, {0.2f, 0.2f, 0.2f, 1.0f});

      ctx->IASetIndexBuffer(ib2, DXGI_FORMAT_R16_UINT, 0);

      // should get identical results with the vertex offset
      ctx->DrawIndexed(17, 0, -10);

      Present();
    }

    return 0;
  }
};

REGISTER_TEST();