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2025-11-28 23:13:44 +05:30
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physx/samples/sampleframework/media/shaders/include/lighting.cg Normal file
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#ifndef LIGHTING_CG
#define LIGHTING_CG
#include <config.cg>
#include <globals.cg>
// Internal Lighting functions...
Lighting computeAmbientLight( const FragmentParameters params, const SurfaceMaterial material);
Lighting computeDirectionalLight(const FragmentParameters params, const SurfaceMaterial material);
Lighting computePointLight( const FragmentParameters params, const SurfaceMaterial material);
Lighting computeSpotLight( const FragmentParameters params, const SurfaceMaterial material);
#if defined(PASS_SUPPORTS_SHADOWS)
#define NUM_SHADOW_OFFSETS 32
static float2 shadowMapOffsets[NUM_SHADOW_OFFSETS] =
{
float2( 0.024439,-0.191747), float2( 0.127369, 0.462646), float2( 0.769628,-0.291028), float2(-0.684950, 0.518250),
float2( 0.019485, 0.303360), float2(-0.234805,-0.278718), float2(-0.679808,-0.717623), float2(-0.004622,-0.000659),
float2(-0.128309,-0.515931), float2( 0.497521, 0.347996), float2( 0.197836,-0.405042), float2(-0.576391,-0.192435),
float2( 0.379497, 0.355307), float2( 0.642894,-0.338695), float2( 0.368096, 0.394195), float2(-0.024818,-0.234009),
float2(-0.487682, 0.608270), float2( 0.822138, 0.568698), float2(-0.184849, 0.191561), float2( 0.020395,-0.012156),
float2(-0.647774,-0.197404), float2(-0.681738,-0.615919), float2(-0.418447,-0.412937), float2( 0.632155, 0.357966),
float2(-0.742742,-0.038003), float2(-0.759170,-0.569653), float2(-0.508216, 0.317101), float2( 0.547166,-0.267258),
float2(-0.134347, 0.070130), float2(-0.210947,-0.774648), float2( 0.751069, 0.026197), float2(-0.595643,-0.277915),
};
#endif
float computeShadowTerm(const FragmentParameters params)
{
float shadowMask = 1;
#if defined(PASS_SUPPORTS_SHADOWS) && ENABLE_SHADOWS
const float shadowDepthBias = 0.02;
const float depthBias = 0.00006;
#if 0
float4 lsp = mul(float4(params.worldSpacePosition, 1), g_lightShadowMatrix);
lsp = float4(float2(0.5,-0.5)*lsp.xy/lsp.w + 0.5, lsp.z/lsp.w - depthBias, 1);
shadowMask = tex2Dproj(g_lightShadowMap, lsp).x;
#elif 1
const float shadowOffsetScale = 0.005;
float4 lsp = mul(float4(params.worldSpacePosition, 1), g_lightShadowMatrix);
lsp = float4(float2(0.5,-0.5)*lsp.xy/lsp.w + 0.5, lsp.z/lsp.w - depthBias, 1);
shadowMask = 0;
for(int i=0; i<NUM_SHADOW_OFFSETS; i++)
{
float4 texcoord = lsp+float4(shadowMapOffsets[i]*shadowOffsetScale, 0,0);
shadowMask += tex2Dproj(g_lightShadowMap, texcoord).x;
}
shadowMask /= NUM_SHADOW_OFFSETS;
#else
const float fragmentDepth = length(g_lightPosition-params.worldSpacePosition)-shadowDepthBias;
float4 lsp = mul(float4(params.worldSpacePosition, 1), g_lightShadowMatrix);
lsp = float4(float2(0.5,-0.5)*lsp.xy/lsp.w + 0.5, lsp.z/lsp.w - depthBias, 1);
const float shadowOffsetScale = 0.002;
float4 shadowSpacePosition = mul(float4(params.worldSpacePosition, 1), g_lightShadowMatrix);
float2 shadowUV = float2(0.5,-0.5) * shadowSpacePosition.xy / shadowSpacePosition.w + float2(0.5, 0.5);
for(int i=0; i<NUM_SHADOW_OFFSETS/4; i++)
{
float4 shadowMapColor;
shadowMapColor.r = tex2D(g_lightShadowMap, (shadowUV+shadowMapOffsets[i*4+0]*shadowOffsetScale)).r;
shadowMapColor.g = tex2D(g_lightShadowMap, (shadowUV+shadowMapOffsets[i*4+1]*shadowOffsetScale)).r;
shadowMapColor.b = tex2D(g_lightShadowMap, (shadowUV+shadowMapOffsets[i*4+2]*shadowOffsetScale)).r;
shadowMapColor.a = tex2D(g_lightShadowMap, (shadowUV+shadowMapOffsets[i*4+3]*shadowOffsetScale)).r;
for(int j=0; j<4; j++)
{
if(shadowMapColor[j] < lsp.z)
{
shadowMask -= (1.0f/NUM_SHADOW_OFFSETS);
}
}
}
#endif
#endif
return shadowMask;
}
Lighting computeLighting(const FragmentParameters params, const SurfaceMaterial material)
{
Lighting lout;
#if defined(PASS_AMBIENT_LIGHT)
lout = computeAmbientLight(params, material);
#elif defined(PASS_DIRECTIONAL_LIGHT)
lout = computeDirectionalLight(params, material);
#elif defined(PASS_POINT_LIGHT)
lout = computePointLight(params, material);
#elif defined(PASS_SPOT_LIGHT) || defined(PASS_SPOT_LIGHT_NO_SHADOW)
lout = computeSpotLight(params, material);
#endif
const float shadowTerm = computeShadowTerm(params);
lout.diffuseColor *= (half)shadowTerm;
lout.specularColor *= (half)shadowTerm;
lout.diffuseColor += (half3)g_ambientColor * material.diffuseColor;
return lout;
}
#endif