Method Bind

Source/Engine/Graphics/Materials/TerrainMaterialShader.cpp:44–123

}

void TerrainMaterialShader::Bind(BindParameters& params)
{
    // Prepare
    auto context = params.GPUContext;
    auto& view = params.RenderContext.View;
    auto& drawCall = *params.DrawCall;
    Span<byte> cb(_cbData.Get(), _cbData.Count());
    ASSERT_LOW_LAYER(cb.Length() >= sizeof(TerrainMaterialShaderData));
    auto materialData = reinterpret_cast<TerrainMaterialShaderData*>(cb.Get());
    cb = cb.Slice(sizeof(TerrainMaterialShaderData));
    int32 srv = 3;

    // Setup features
    const bool useLightmap = LightmapFeature::Bind(params, cb, srv);

    // Setup parameters
    MaterialParameter::BindMeta bindMeta;
    bindMeta.Context = context;
    bindMeta.Constants = cb;
    bindMeta.Input = nullptr;
    bindMeta.Buffers = params.RenderContext.Buffers;
    bindMeta.CanSampleDepth = false;
    bindMeta.CanSampleGBuffer = false;
    MaterialParams::Bind(params.ParamsLink, bindMeta);

    // Setup material constants
    {
        materialData->WorldMatrix.SetMatrixTranspose(drawCall.World);
        const float scaleX = Float3(drawCall.World.M11, drawCall.World.M12, drawCall.World.M13).Length();
        const float scaleY = Float3(drawCall.World.M21, drawCall.World.M22, drawCall.World.M23).Length();
        const float scaleZ = Float3(drawCall.World.M31, drawCall.World.M32, drawCall.World.M33).Length();
        materialData->WorldInvScale = Float3(
            scaleX > 0.00001f ? 1.0f / scaleX : 0.0f,
            scaleY > 0.00001f ? 1.0f / scaleY : 0.0f,
            scaleZ > 0.00001f ? 1.0f / scaleZ : 0.0f);
        materialData->WorldDeterminantSign = drawCall.WorldDeterminant ? -1.0f : 1.0f;
        materialData->PerInstanceRandom = drawCall.PerInstanceRandom;
        materialData->CurrentLOD = drawCall.Terrain.CurrentLOD;
        materialData->ChunkSizeNextLOD = drawCall.Terrain.ChunkSizeNextLOD;
        materialData->TerrainChunkSizeLOD0 = drawCall.Terrain.TerrainChunkSizeLOD0;
        materialData->HeightmapUVScaleBias = drawCall.Terrain.HeightmapUVScaleBias;
        materialData->NeighborLOD = drawCall.Terrain.NeighborLOD;
        materialData->OffsetUV = drawCall.Terrain.OffsetUV;
        materialData->LightmapArea = *(Float4*)&drawCall.Terrain.LightmapUVsArea;
    }

    // Bind terrain textures
    GPUTexture* heightmap, *splatmap0, *splatmap1;
    drawCall.Terrain.Patch->GetTextures(heightmap, splatmap0, splatmap1);
    context->BindSR(0, heightmap);
    context->BindSR(1, splatmap0);
    context->BindSR(2, splatmap1);

    // Bind constants
    if (_cb)
    {
        context->UpdateCB(_cb, _cbData.Get());
        context->BindCB(0, _cb);