mirror of
https://github.com/ncblakely/GiantsTools
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459 lines
15 KiB
C++
459 lines
15 KiB
C++
//--------------------------------------------------------------------------------------
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// File: EffectCommon.cpp
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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//
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// http://go.microsoft.com/fwlink/?LinkId=248929
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//--------------------------------------------------------------------------------------
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#include "pch.h"
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#include "EffectCommon.h"
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#include "DemandCreate.h"
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using namespace DirectX;
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using Microsoft::WRL::ComPtr;
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// IEffectMatrices default method
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void XM_CALLCONV IEffectMatrices::SetMatrices(FXMMATRIX world, CXMMATRIX view, CXMMATRIX projection)
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{
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SetWorld(world);
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SetView(view);
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SetProjection(projection);
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}
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// Constructor initializes default matrix values.
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EffectMatrices::EffectMatrices() noexcept
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{
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XMMATRIX id = XMMatrixIdentity();
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world = id;
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view = id;
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projection = id;
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worldView = id;
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}
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// Lazily recomputes the combined world+view+projection matrix.
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_Use_decl_annotations_
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void EffectMatrices::SetConstants(int& dirtyFlags, XMMATRIX& worldViewProjConstant)
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{
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if (dirtyFlags & EffectDirtyFlags::WorldViewProj)
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{
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worldView = XMMatrixMultiply(world, view);
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worldViewProjConstant = XMMatrixTranspose(XMMatrixMultiply(worldView, projection));
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dirtyFlags &= ~EffectDirtyFlags::WorldViewProj;
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dirtyFlags |= EffectDirtyFlags::ConstantBuffer;
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}
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}
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// Constructor initializes default fog settings.
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EffectFog::EffectFog() noexcept :
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enabled(false),
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start(0),
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end(1.f)
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{
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}
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// Lazily recomputes the derived vector used by shader fog calculations.
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_Use_decl_annotations_
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void XM_CALLCONV EffectFog::SetConstants(int& dirtyFlags, FXMMATRIX worldView, XMVECTOR& fogVectorConstant)
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{
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if (enabled)
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{
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if (dirtyFlags & (EffectDirtyFlags::FogVector | EffectDirtyFlags::FogEnable))
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{
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if (start == end)
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{
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// Degenerate case: force everything to 100% fogged if start and end are the same.
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static const XMVECTORF32 fullyFogged = { { { 0, 0, 0, 1 } } };
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fogVectorConstant = fullyFogged;
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}
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else
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{
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// We want to transform vertex positions into view space, take the resulting
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// Z value, then scale and offset according to the fog start/end distances.
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// Because we only care about the Z component, the shader can do all this
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// with a single dot product, using only the Z row of the world+view matrix.
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// _13, _23, _33, _43
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XMVECTOR worldViewZ = XMVectorMergeXY(XMVectorMergeZW(worldView.r[0], worldView.r[2]),
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XMVectorMergeZW(worldView.r[1], worldView.r[3]));
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// 0, 0, 0, fogStart
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XMVECTOR wOffset = XMVectorSwizzle<1, 2, 3, 0>(XMLoadFloat(&start));
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// (worldViewZ + wOffset) / (start - end);
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fogVectorConstant = XMVectorDivide(XMVectorAdd(worldViewZ, wOffset), XMVectorReplicate(start - end));
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}
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dirtyFlags &= ~(EffectDirtyFlags::FogVector | EffectDirtyFlags::FogEnable);
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dirtyFlags |= EffectDirtyFlags::ConstantBuffer;
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}
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}
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else
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{
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// When fog is disabled, make sure the fog vector is reset to zero.
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if (dirtyFlags & EffectDirtyFlags::FogEnable)
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{
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fogVectorConstant = g_XMZero;
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dirtyFlags &= ~EffectDirtyFlags::FogEnable;
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dirtyFlags |= EffectDirtyFlags::ConstantBuffer;
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}
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}
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}
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// Constructor initializes default material color settings.
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EffectColor::EffectColor() noexcept :
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diffuseColor(g_XMOne),
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alpha(1.f)
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{
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}
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// Lazily recomputes the material color parameter for shaders that do not support realtime lighting.
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void EffectColor::SetConstants(_Inout_ int& dirtyFlags, _Inout_ XMVECTOR& diffuseColorConstant)
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{
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if (dirtyFlags & EffectDirtyFlags::MaterialColor)
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{
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XMVECTOR alphaVector = XMVectorReplicate(alpha);
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// xyz = diffuse * alpha, w = alpha.
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diffuseColorConstant = XMVectorSelect(alphaVector, XMVectorMultiply(diffuseColor, alphaVector), g_XMSelect1110);
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dirtyFlags &= ~EffectDirtyFlags::MaterialColor;
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dirtyFlags |= EffectDirtyFlags::ConstantBuffer;
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}
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}
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// Constructor initializes default light settings.
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EffectLights::EffectLights() noexcept :
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emissiveColor{},
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ambientLightColor{},
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lightEnabled{},
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lightDiffuseColor{},
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lightSpecularColor{}
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{
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for (int i = 0; i < MaxDirectionalLights; i++)
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{
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lightEnabled[i] = (i == 0);
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lightDiffuseColor[i] = g_XMOne;
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}
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}
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#ifdef _PREFAST_
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#pragma prefast(push)
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#pragma prefast(disable:22103, "PREFAST doesn't understand buffer is bounded by a static const value even with SAL" )
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#endif
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// Initializes constant buffer fields to match the current lighting state.
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_Use_decl_annotations_ void EffectLights::InitializeConstants(XMVECTOR& specularColorAndPowerConstant, XMVECTOR* lightDirectionConstant, XMVECTOR* lightDiffuseConstant, XMVECTOR* lightSpecularConstant) const
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{
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static const XMVECTORF32 defaultSpecular = { { { 1, 1, 1, 16 } } };
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static const XMVECTORF32 defaultLightDirection = { { { 0, -1, 0, 0 } } };
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specularColorAndPowerConstant = defaultSpecular;
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for (int i = 0; i < MaxDirectionalLights; i++)
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{
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lightDirectionConstant[i] = defaultLightDirection;
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lightDiffuseConstant[i] = lightEnabled[i] ? lightDiffuseColor[i] : g_XMZero;
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lightSpecularConstant[i] = lightEnabled[i] ? lightSpecularColor[i] : g_XMZero;
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}
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}
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#ifdef _PREFAST_
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#pragma prefast(pop)
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#endif
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// Lazily recomputes derived parameter values used by shader lighting calculations.
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_Use_decl_annotations_ void EffectLights::SetConstants(int& dirtyFlags, EffectMatrices const& matrices, XMMATRIX& worldConstant, XMVECTOR worldInverseTransposeConstant[3], XMVECTOR& eyePositionConstant, XMVECTOR& diffuseColorConstant, XMVECTOR& emissiveColorConstant, bool lightingEnabled)
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{
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if (lightingEnabled)
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{
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// World inverse transpose matrix.
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if (dirtyFlags & EffectDirtyFlags::WorldInverseTranspose)
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{
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worldConstant = XMMatrixTranspose(matrices.world);
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XMMATRIX worldInverse = XMMatrixInverse(nullptr, matrices.world);
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worldInverseTransposeConstant[0] = worldInverse.r[0];
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worldInverseTransposeConstant[1] = worldInverse.r[1];
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worldInverseTransposeConstant[2] = worldInverse.r[2];
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dirtyFlags &= ~EffectDirtyFlags::WorldInverseTranspose;
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dirtyFlags |= EffectDirtyFlags::ConstantBuffer;
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}
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// Eye position vector.
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if (dirtyFlags & EffectDirtyFlags::EyePosition)
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{
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XMMATRIX viewInverse = XMMatrixInverse(nullptr, matrices.view);
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eyePositionConstant = viewInverse.r[3];
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dirtyFlags &= ~EffectDirtyFlags::EyePosition;
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dirtyFlags |= EffectDirtyFlags::ConstantBuffer;
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}
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}
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// Material color parameters. The desired lighting model is:
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//
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// ((ambientLightColor + sum(diffuse directional light)) * diffuseColor) + emissiveColor
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//
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// When lighting is disabled, ambient and directional lights are ignored, leaving:
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//
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// diffuseColor + emissiveColor
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//
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// For the lighting disabled case, we can save one shader instruction by precomputing
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// diffuse+emissive on the CPU, after which the shader can use diffuseColor directly,
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// ignoring its emissive parameter.
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//
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// When lighting is enabled, we can merge the ambient and emissive settings. If we
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// set our emissive parameter to emissive+(ambient*diffuse), the shader no longer
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// needs to bother adding the ambient contribution, simplifying its computation to:
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//
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// (sum(diffuse directional light) * diffuseColor) + emissiveColor
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//
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// For futher optimization goodness, we merge material alpha with the diffuse
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// color parameter, and premultiply all color values by this alpha.
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if (dirtyFlags & EffectDirtyFlags::MaterialColor)
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{
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XMVECTOR diffuse = diffuseColor;
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XMVECTOR alphaVector = XMVectorReplicate(alpha);
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if (lightingEnabled)
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{
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// Merge emissive and ambient light contributions.
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// (emissiveColor + ambientLightColor * diffuse) * alphaVector;
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emissiveColorConstant = XMVectorMultiply(XMVectorMultiplyAdd(ambientLightColor, diffuse, emissiveColor), alphaVector);
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}
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else
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{
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// Merge diffuse and emissive light contributions.
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diffuse = XMVectorAdd(diffuse, emissiveColor);
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}
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// xyz = diffuse * alpha, w = alpha.
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diffuseColorConstant = XMVectorSelect(alphaVector, XMVectorMultiply(diffuse, alphaVector), g_XMSelect1110);
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dirtyFlags &= ~EffectDirtyFlags::MaterialColor;
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dirtyFlags |= EffectDirtyFlags::ConstantBuffer;
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}
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}
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#ifdef _PREFAST_
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#pragma prefast(push)
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#pragma prefast(disable:26015, "PREFAST doesn't understand that ValidateLightIndex bounds whichLight" )
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#endif
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// Helper for turning one of the directional lights on or off.
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_Use_decl_annotations_ int EffectLights::SetLightEnabled(int whichLight, bool value, XMVECTOR* lightDiffuseConstant, XMVECTOR* lightSpecularConstant)
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{
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ValidateLightIndex(whichLight);
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if (lightEnabled[whichLight] == value)
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return 0;
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lightEnabled[whichLight] = value;
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if (value)
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{
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// If this light is now on, store its color in the constant buffer.
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lightDiffuseConstant[whichLight] = lightDiffuseColor[whichLight];
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lightSpecularConstant[whichLight] = lightSpecularColor[whichLight];
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}
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else
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{
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// If the light is off, reset constant buffer colors to zero.
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lightDiffuseConstant[whichLight] = g_XMZero;
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lightSpecularConstant[whichLight] = g_XMZero;
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}
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return EffectDirtyFlags::ConstantBuffer;
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}
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// Helper for setting diffuse color of one of the directional lights.
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_Use_decl_annotations_
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int XM_CALLCONV EffectLights::SetLightDiffuseColor(int whichLight, FXMVECTOR value, XMVECTOR* lightDiffuseConstant)
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{
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ValidateLightIndex(whichLight);
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// Locally store the new color.
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lightDiffuseColor[whichLight] = value;
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// If this light is currently on, also update the constant buffer.
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if (lightEnabled[whichLight])
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{
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lightDiffuseConstant[whichLight] = value;
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return EffectDirtyFlags::ConstantBuffer;
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}
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return 0;
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}
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// Helper for setting specular color of one of the directional lights.
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_Use_decl_annotations_
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int XM_CALLCONV EffectLights::SetLightSpecularColor(int whichLight, FXMVECTOR value, XMVECTOR* lightSpecularConstant)
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{
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ValidateLightIndex(whichLight);
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// Locally store the new color.
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lightSpecularColor[whichLight] = value;
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// If this light is currently on, also update the constant buffer.
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if (lightEnabled[whichLight])
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{
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lightSpecularConstant[whichLight] = value;
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return EffectDirtyFlags::ConstantBuffer;
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}
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return 0;
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}
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#ifdef _PREFAST_
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#pragma prefast(pop)
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#endif
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// Parameter validation helper.
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void EffectLights::ValidateLightIndex(int whichLight)
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{
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if (whichLight < 0 || whichLight >= MaxDirectionalLights)
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{
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throw std::out_of_range("whichLight parameter out of range");
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}
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}
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// Activates the default lighting rig (key, fill, and back lights).
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void EffectLights::EnableDefaultLighting(_In_ IEffectLights* effect)
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{
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static const XMVECTORF32 defaultDirections[MaxDirectionalLights] =
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{
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{ { { -0.5265408f, -0.5735765f, -0.6275069f, 0 } } },
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{ { { 0.7198464f, 0.3420201f, 0.6040227f, 0 } } },
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{ { { 0.4545195f, -0.7660444f, 0.4545195f, 0 } } },
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};
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static const XMVECTORF32 defaultDiffuse[MaxDirectionalLights] =
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{
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{ { { 1.0000000f, 0.9607844f, 0.8078432f, 0 } } },
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{ { { 0.9647059f, 0.7607844f, 0.4078432f, 0 } } },
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{ { { 0.3231373f, 0.3607844f, 0.3937255f, 0 } } },
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};
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static const XMVECTORF32 defaultSpecular[MaxDirectionalLights] =
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{
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{ { { 1.0000000f, 0.9607844f, 0.8078432f, 0 } } },
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{ { { 0.0000000f, 0.0000000f, 0.0000000f, 0 } } },
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{ { { 0.3231373f, 0.3607844f, 0.3937255f, 0 } } },
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};
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static const XMVECTORF32 defaultAmbient = { { { 0.05333332f, 0.09882354f, 0.1819608f, 0 } } };
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effect->SetLightingEnabled(true);
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effect->SetAmbientLightColor(defaultAmbient);
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for (int i = 0; i < MaxDirectionalLights; i++)
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{
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effect->SetLightEnabled(i, true);
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effect->SetLightDirection(i, defaultDirections[i]);
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effect->SetLightDiffuseColor(i, defaultDiffuse[i]);
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effect->SetLightSpecularColor(i, defaultSpecular[i]);
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}
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}
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// Gets or lazily creates the specified vertex shader permutation.
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ID3D11VertexShader* EffectDeviceResources::DemandCreateVertexShader(_Inout_ ComPtr<ID3D11VertexShader>& vertexShader, ShaderBytecode const& bytecode)
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{
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return DemandCreate(vertexShader, mMutex, [&](ID3D11VertexShader** pResult) -> HRESULT
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{
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HRESULT hr = mDevice->CreateVertexShader(bytecode.code, bytecode.length, nullptr, pResult);
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if (SUCCEEDED(hr))
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SetDebugObjectName(*pResult, "DirectXTK:Effect");
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return hr;
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});
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}
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// Gets or lazily creates the specified pixel shader permutation.
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ID3D11PixelShader* EffectDeviceResources::DemandCreatePixelShader(_Inout_ ComPtr<ID3D11PixelShader>& pixelShader, ShaderBytecode const& bytecode)
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{
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return DemandCreate(pixelShader, mMutex, [&](ID3D11PixelShader** pResult) -> HRESULT
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{
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HRESULT hr = mDevice->CreatePixelShader(bytecode.code, bytecode.length, nullptr, pResult);
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if (SUCCEEDED(hr))
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SetDebugObjectName(*pResult, "DirectXTK:Effect");
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return hr;
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});
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}
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// Gets or lazily creates the default texture
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ID3D11ShaderResourceView* EffectDeviceResources::GetDefaultTexture()
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{
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return DemandCreate(mDefaultTexture, mMutex, [&](ID3D11ShaderResourceView** pResult) -> HRESULT
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{
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static const uint32_t s_pixel = 0xffffffff;
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D3D11_SUBRESOURCE_DATA initData = { &s_pixel, sizeof(uint32_t), 0 };
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D3D11_TEXTURE2D_DESC desc = {};
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desc.Width = desc.Height = desc.MipLevels = desc.ArraySize = 1;
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desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
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desc.SampleDesc.Count = 1;
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desc.Usage = D3D11_USAGE_IMMUTABLE;
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desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
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ComPtr<ID3D11Texture2D> tex;
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HRESULT hr = mDevice->CreateTexture2D(&desc, &initData, tex.GetAddressOf());
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if (SUCCEEDED(hr))
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{
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SetDebugObjectName(tex.Get(), "DirectXTK:Effect");
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D3D11_SHADER_RESOURCE_VIEW_DESC SRVDesc = {};
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SRVDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
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SRVDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
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SRVDesc.Texture2D.MipLevels = 1;
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hr = mDevice->CreateShaderResourceView(tex.Get(), &SRVDesc, pResult);
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if (SUCCEEDED(hr))
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SetDebugObjectName(*pResult, "DirectXTK:Effect");
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}
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return hr;
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});
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}
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// Gets device feature level
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D3D_FEATURE_LEVEL EffectDeviceResources::GetDeviceFeatureLevel() const
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{
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return mDevice->GetFeatureLevel();
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}
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