326 lines
9.6 KiB
HLSL
326 lines
9.6 KiB
HLSL
//======================================================================================//
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// filename: FixedFuncShader.fx //
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// //
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// author: Pedro V. Sander //
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// ATI Research, Inc. //
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// 3D Application Research Group //
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// email: psander@ati.com //
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// //
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// Description: A programmable shader that emulates the fixed function pipeline //
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// //
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//======================================================================================//
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// (C) 2003 ATI Research, Inc. All rights reserved. //
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//======================================================================================//
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#define PI 3.14f
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//this file contains light, fog, and texture types
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// (originally a include, inserted here)
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#define FOG_TYPE_NONE 0
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#define FOG_TYPE_EXP 1
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#define FOG_TYPE_EXP2 2
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#define FOG_TYPE_LINEAR 3
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#define FOG_NUM_TYPES 4
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#define TEX_TYPE_NONE 0
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#define TEX_TYPE_CUBEMAP 1
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#define TEX_NUM_TYPES 2
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#define TEXGEN_TYPE_NONE 0
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#define TEXGEN_TYPE_CAMERASPACENORMAL 1
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#define TEXGEN_TYPE_CAMERASPACEPOSITION 2
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#define TEXGEN_TYPE_CAMERASPACEREFLECTIONVECTOR 3
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#define TEXGEN_NUM_TYPES 4
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#define MAX_DIRECTIONAL_LIGHTS 3
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// Structs and variables with default values
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//fog settings
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int iFogType = FOG_TYPE_LINEAR;
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float4 vFogColor = float4(0.0f, 0.0f, 0.0f, 0.0f);
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float fFogStart = 0;
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float fFogEnd = 8845.00000;
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float fFogDensity = .02f;
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bool bFogRange : register(b4) = true;
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int iTexType = TEX_TYPE_NONE;
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int iTexGenType = TEXGEN_TYPE_NONE;
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float4 DirectionalLightAmbient[MAX_DIRECTIONAL_LIGHTS] : DirectionalLightAmbient;
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float4 DirectionalLightDiffuse[MAX_DIRECTIONAL_LIGHTS] : DirectionalLightDiffuse;
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float3 DirectionalLightDirection[MAX_DIRECTIONAL_LIGHTS] : DirectionalLightDirection;
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bool DirectionalLightEnabled[MAX_DIRECTIONAL_LIGHTS] : DirectionalLightEnabled;
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float4 DirectionalLightSpecular[MAX_DIRECTIONAL_LIGHTS] : DirectionalLightSpecular;
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float3 g_CameraPosition : CameraPosition;
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struct Material
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{
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float4 Diffuse;
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float4 Ambient;
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float4 Specular;
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float4 Emissive;
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float Power;
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};
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Material g_Material : Material;
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//transformation matrices
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float4x4 matWorldViewProjection : WorldViewProjection;
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float4x4 matWorldView : WorldView;
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float4x4 matWorld : World;
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float4x4 matView : View;
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//function output structures
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struct VS_OUTPUT
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{
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float4 Pos : POSITION;
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float4 Color : COLOR0;
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float4 ColorSpec : COLOR1;
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float4 Tex0 : TEXCOORD0;
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float Fog : FOG;
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};
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struct COLOR_PAIR
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{
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float4 Color : COLOR0;
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float4 ColorSpec : COLOR1;
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};
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float4 CalculateAmbientLight()
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{
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float4 ambient = 0;
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for (int i = 0; i < MAX_DIRECTIONAL_LIGHTS; i++)
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{
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if (DirectionalLightEnabled[i])
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{
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ambient += DirectionalLightAmbient[i];
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}
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}
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return ambient;
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}
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COLOR_PAIR DoDirectionalLight(float3 worldPos, float3 N, int i)
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{
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COLOR_PAIR Out = (COLOR_PAIR)0;
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float NdotL = dot(N, -DirectionalLightDirection[i]);
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if (NdotL > 0.f)
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{
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//compute diffuse color
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Out.Color += max(0, NdotL * DirectionalLightDiffuse[i]);
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if (g_Material.Power > 0)
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{
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float3 toEye = g_CameraPosition.xyz - worldPos;
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toEye = normalize(toEye);
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float3 halfway = normalize(toEye + -DirectionalLightDirection[i]);
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float NDotH = saturate(dot(halfway, N));
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float4 spec = DirectionalLightSpecular[i];
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Out.ColorSpec += spec * pow(NDotH, g_Material.Power);
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}
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}
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return Out;
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}
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COLOR_PAIR ComputeLighting(float3 worldPos, float3 N)
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{
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COLOR_PAIR finalResult = (COLOR_PAIR)0;
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for (int i = 0; i < MAX_DIRECTIONAL_LIGHTS; i++)
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{
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COLOR_PAIR lightResult = (COLOR_PAIR)0;
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if (DirectionalLightEnabled[i])
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{
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lightResult = DoDirectionalLight(worldPos, N, i);
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}
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finalResult.Color += lightResult.Color;
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finalResult.ColorSpec += lightResult.ColorSpec;
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}
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float4 ambient = g_Material.Ambient * CalculateAmbientLight();
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float4 diffuse = g_Material.Diffuse * finalResult.Color;
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float4 specular = g_Material.Specular * finalResult.ColorSpec;
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finalResult.Color = saturate(ambient + diffuse);
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finalResult.ColorSpec = saturate(specular);
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return finalResult;
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}
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//-----------------------------------------------------------------------------
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// Name: DoPointLight()
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// Desc: Point light computation
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//-----------------------------------------------------------------------------
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//COLOR_PAIR DoPointLight(float4 vPosition, float3 N, float3 V, int i)
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//{
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// float3 L = mul((float3x3)matViewIT, normalize((lights[i].vPos-(float3)mul(matWorld,vPosition))));
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// COLOR_PAIR Out;
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// float NdotL = dot(N, L);
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// Out.Color = lights[i].vAmbient;
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// Out.ColorSpec = 0;
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// float fAtten = 1.f;
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// if(NdotL >= 0.f)
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// {
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// //compute diffuse color
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// Out.Color += NdotL * lights[i].vDiffuse;
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//
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// //add specular component
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// if(bSpecular)
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// {
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// float3 H = normalize(L + V); //half vector
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// Out.ColorSpec = pow(max(0, dot(H, N)), fMaterialPower) * lights[i].vSpecular;
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// }
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//
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// float LD = length(lights[i].vPos-(float3)mul(matWorld,vPosition));
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// if(LD > lights[i].fRange)
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// {
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// fAtten = 0.f;
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// }
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// else
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// {
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// fAtten *= 1.f/(lights[i].vAttenuation.x + lights[i].vAttenuation.y*LD + lights[i].vAttenuation.z*LD*LD);
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// }
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// Out.Color *= fAtten;
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// Out.ColorSpec *= fAtten;
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// }
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// return Out;
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//}
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//-----------------------------------------------------------------------------
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// Name: vs_main()
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// Desc: The vertex shader
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//-----------------------------------------------------------------------------
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VS_OUTPUT vs_main (float4 vPosition : POSITION0,
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float3 vNormal : NORMAL0,
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float2 tc : TEXCOORD0)
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{
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VS_OUTPUT Out = (VS_OUTPUT) 0;
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vNormal = normalize(vNormal);
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Out.Pos = mul(vPosition, matWorldViewProjection);
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//automatic texture coordinate generation
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Out.Tex0.xy = tc;
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/*Out.Tex0 = float4((2.f * dot(V,N) * N - V) * (iTexGenType == TEXGEN_TYPE_CAMERASPACEREFLECTIONVECTOR)
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+ N * (iTexGenType == TEXGEN_TYPE_CAMERASPACENORMAL)
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+ P * (iTexGenType == TEXGEN_TYPE_CAMERASPACEPOSITION), 0);
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Out.Tex0.xy += tc * (iTexGenType == TEXGEN_TYPE_NONE);*/
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//light computation
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//directional lights
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float4 worldPos = mul(vPosition, matWorld); //position in view space
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float3 N = mul(vNormal, (float3x3)matWorld);
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COLOR_PAIR lighting = ComputeLighting(worldPos, N);
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////point lights
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//for(int i = 0; i < iLightPointNum; i++)
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//{
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// COLOR_PAIR ColOut = DoPointLight(vPosition, N, V, i+iLightPointIni);
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// Out.Color += ColOut.Color;
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// Out.ColorSpec += ColOut.ColorSpec;
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//}
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//apply material color
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Out.Color = lighting.Color;
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Out.ColorSpec = lighting.ColorSpec;
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//apply fog
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float4 P = mul(matWorldView, vPosition); //position in view space
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float d;
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if(bFogRange)
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d = length(P);
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else
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d = P.z;
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Out.Fog = 1.f * (iFogType == FOG_TYPE_NONE)
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+ 1.f/exp(d * fFogDensity) * (iFogType == FOG_TYPE_EXP)
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+ 1.f/exp(pow(d * fFogDensity, 2)) * (iFogType == FOG_TYPE_EXP2)
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+ saturate((fFogEnd - d)/(fFogEnd - fFogStart)) * (iFogType == FOG_TYPE_LINEAR);
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return Out;
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}
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// Techniques
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//the technique for the programmable shader (simply sets the vertex shader)
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technique basic_with_shader
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{
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pass P0
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{
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VertexShader = compile vs_2_0 vs_main();
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}
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}
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TEXTURE tex1;
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TEXTURE tex2;
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//Sampler for the diff mode
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sampler DiffSampler1 = sampler_state
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{
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Texture = (tex1);
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MinFilter = Point;
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MagFilter = Point;
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MipFilter = Point;
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AddressU = Wrap;
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AddressV = Wrap;
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AddressW = Wrap;
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MaxAnisotropy = 8;
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};
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sampler DiffSampler2 = sampler_state
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{
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Texture = (tex2);
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MinFilter = Point;
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MagFilter = Point;
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MipFilter = Point;
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AddressU = Wrap;
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AddressV = Wrap;
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AddressW = Wrap;
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MaxAnisotropy = 8;
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};
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bool bDiffSensitivity = false;
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//-----------------------------------------------------------------------------
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// Name: ps_diff()
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// Desc: Pixel shader for the diff mode
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// Tiny errors: green. Larger errors: yellow to red.
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//-----------------------------------------------------------------------------
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float4 ps_diff (float2 tcBase : TEXCOORD0) : COLOR
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{
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float E = length(tex2D(DiffSampler1, tcBase) - tex2D(DiffSampler2, tcBase))/sqrt(3);
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float4 C = float4(0.f,0.f,0.f,E);
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if(E > 0.f)
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{
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if(E <= 1.f/255.f)
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{
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if(bDiffSensitivity)
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{
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C = float4(0.f,1.f,0.f,E);
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}
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}
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else
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{
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C = lerp(float4(1.f,1.f,0.f,E), float4(1.f,0.f,0.f,E),E);
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}
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}
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return C;
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}
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//technique for the diff mode
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technique technique_diff
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{
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pass P0
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{
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PixelShader = compile ps_2_0 ps_diff();
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}
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}
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