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Introduction to 3D Game …ogramming with DirectX 12
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Introduction-to-3D-Game-Programming-with-DirectX-12.ISO
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Code.Textures
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Chapter 12 The Geometry Shader
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Shaders
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Default.hlsl
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2016-03-02
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//***************************************************************************************
// Default.hlsl by Frank Luna (C) 2015 All Rights Reserved.
//
// Default shader, currently supports lighting.
//***************************************************************************************
// Defaults for number of lights.
#ifndef NUM_DIR_LIGHTS
#define NUM_DIR_LIGHTS 3
#endif
#ifndef NUM_POINT_LIGHTS
#define NUM_POINT_LIGHTS 0
#endif
#ifndef NUM_SPOT_LIGHTS
#define NUM_SPOT_LIGHTS 0
#endif
// Include structures and functions for lighting.
#include "LightingUtil.hlsl"
Texture2D gDiffuseMap : register(t0);
SamplerState gsamPointWrap : register(s0);
SamplerState gsamPointClamp : register(s1);
SamplerState gsamLinearWrap : register(s2);
SamplerState gsamLinearClamp : register(s3);
SamplerState gsamAnisotropicWrap : register(s4);
SamplerState gsamAnisotropicClamp : register(s5);
// Constant data that varies per frame.
cbuffer cbPerObject : register(b0)
{
float4x4 gWorld;
float4x4 gTexTransform;
};
// Constant data that varies per material.
cbuffer cbPass : register(b1)
{
float4x4 gView;
float4x4 gInvView;
float4x4 gProj;
float4x4 gInvProj;
float4x4 gViewProj;
float4x4 gInvViewProj;
float3 gEyePosW;
float cbPerObjectPad1;
float2 gRenderTargetSize;
float2 gInvRenderTargetSize;
float gNearZ;
float gFarZ;
float gTotalTime;
float gDeltaTime;
float4 gAmbientLight;
float4 gFogColor;
float gFogStart;
float gFogRange;
float2 cbPerObjectPad2;
// Indices [0, NUM_DIR_LIGHTS) are directional lights;
// indices [NUM_DIR_LIGHTS, NUM_DIR_LIGHTS+NUM_POINT_LIGHTS) are point lights;
// indices [NUM_DIR_LIGHTS+NUM_POINT_LIGHTS, NUM_DIR_LIGHTS+NUM_POINT_LIGHT+NUM_SPOT_LIGHTS)
// are spot lights for a maximum of MaxLights per object.
Light gLights[MaxLights];
};
cbuffer cbMaterial : register(b2)
{
float4 gDiffuseAlbedo;
float3 gFresnelR0;
float gRoughness;
float4x4 gMatTransform;
};
struct VertexIn
{
float3 PosL : POSITION;
float3 NormalL : NORMAL;
float2 TexC : TEXCOORD;
};
struct VertexOut
{
float4 PosH : SV_POSITION;
float3 PosW : POSITION;
float3 NormalW : NORMAL;
float2 TexC : TEXCOORD;
};
VertexOut VS(VertexIn vin)
{
VertexOut vout = (VertexOut)0.0f;
// Transform to world space.
float4 posW = mul(float4(vin.PosL, 1.0f), gWorld);
vout.PosW = posW.xyz;
// Assumes nonuniform scaling; otherwise, need to use inverse-transpose of world matrix.
vout.NormalW = mul(vin.NormalL, (float3x3)gWorld);
// Transform to homogeneous clip space.
vout.PosH = mul(posW, gViewProj);
// Output vertex attributes for interpolation across triangle.
float4 texC = mul(float4(vin.TexC, 0.0f, 1.0f), gTexTransform);
vout.TexC = mul(texC, gMatTransform).xy;
return vout;
}
float4 PS(VertexOut pin) : SV_Target
{
float4 diffuseAlbedo = gDiffuseMap.Sample(gsamAnisotropicWrap, pin.TexC) * gDiffuseAlbedo;
#ifdef ALPHA_TEST
// Discard pixel if texture alpha < 0.1. We do this test as soon
// as possible in the shader so that we can potentially exit the
// shader early, thereby skipping the rest of the shader code.
clip(diffuseAlbedo.a - 0.1f);
#endif
// Interpolating normal can unnormalize it, so renormalize it.
pin.NormalW = normalize(pin.NormalW);
// Vector from point being lit to eye.
float3 toEyeW = gEyePosW - pin.PosW;
float distToEye = length(toEyeW);
toEyeW /= distToEye; // normalize
// Light terms.
float4 ambient = gAmbientLight*diffuseAlbedo;
const float shininess = 1.0f - gRoughness;
Material mat = { diffuseAlbedo, gFresnelR0, shininess };
float3 shadowFactor = 1.0f;
float4 directLight = ComputeLighting(gLights, mat, pin.PosW,
pin.NormalW, toEyeW, shadowFactor);
float4 litColor = ambient + directLight;
#ifdef FOG
float fogAmount = saturate((distToEye - gFogStart) / gFogRange);
litColor = lerp(litColor, gFogColor, fogAmount);
#endif
// Common convention to take alpha from diffuse albedo.
litColor.a = diffuseAlbedo.a;
return litColor;
}