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Improved shadow mapping performance using randomly rotated Poisson discs

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This commit is contained in:
Robert Beckebans 2014-05-16 21:33:39 +02:00
parent 7f0f7f8a41
commit ef9869972d
4 changed files with 80 additions and 7 deletions
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67
base/renderprogs/interactionSM.pixel
View file

@ -208,7 +208,7 @@ void main( PS_IN fragment, out PS_OUT result )
// multiple taps
#if 1
#if 0
float4 base = shadowTexcoord;
base.xy += rpJitterTexScale.xy * -0.5;
@ -231,7 +231,70 @@ void main( PS_IN fragment, out PS_OUT result )
shadow *= stepSize;
#else
float shadow = texture( samp5, shadowTexcoord.xywz );
const float2 poissonDisk[12] = float2[](
float2(0.6111618, 0.1050905),
float2(0.1088336, 0.1127091),
float2(0.3030421, -0.6292974),
float2(0.4090526, 0.6716492),
float2(-0.1608387, -0.3867823),
float2(0.7685862, -0.6118501),
float2(-0.1935026, -0.856501),
float2(-0.4028573, 0.07754025),
float2(-0.6411021, -0.4748057),
float2(-0.1314865, 0.8404058),
float2(-0.7005203, 0.4596822),
float2(-0.9713828, -0.06329931) );
// const float2 poissonDisk[16] = float2[](
// float2( -0.94201624, -0.39906216 ),
// float2( 0.94558609, -0.76890725 ),
// float2( -0.094184101, -0.92938870 ),
// float2( 0.34495938, 0.29387760 ),
// float2( -0.91588581, 0.45771432 ),
// float2( -0.81544232, -0.87912464 ),
// float2( -0.38277543, 0.27676845 ),
// float2( 0.97484398, 0.75648379 ),
// float2( 0.44323325, -0.97511554 ),
// float2( 0.53742981, -0.47373420 ),
// float2( -0.26496911, -0.41893023 ),
// float2( 0.79197514, 0.19090188 ),
// float2( -0.24188840, 0.99706507 ),
// float2( -0.81409955, 0.91437590 ),
// float2( 0.19984126, 0.78641367 ),
// float2( 0.14383161, -0.14100790 )
// );
float shadow = 0.0;
int numSamples = 12; //int(rpScreenCorrectionFactor.w);
float stepSize = 1.0 / numSamples;
float4 jitterTC = ( fragment.position * rpScreenCorrectionFactor ) + rpJitterTexOffset;
float4 random = tex2D( samp6, jitterTC.xy ) * PI;// * rpJitterTexScale;
//float4 random = fragment.position;
float2 rot;
rot.x = cos( random.x );
rot.y = sin( random.x );
float shadowTexelSize = rpScreenCorrectionFactor.z * 3.0;
for( int i = 0; i < numSamples; i++ )
{
float2 jitter = poissonDisk[i];
float2 jitterRotated;
jitterRotated.x = jitter.x * rot.x - jitter.y * rot.y;
jitterRotated.y = jitter.x * rot.y + jitter.y * rot.x;
float4 shadowTexcoordJittered = float4( shadowTexcoord.xy + jitterRotated * shadowTexelSize, shadowTexcoord.z, shadowTexcoord.w );
shadow += texture( samp5, shadowTexcoordJittered.xywz);
}
shadow *= stepSize;
//float shadow = texture( samp5, shadowTexcoord.xywz );
#endif
result.color.xyz = ( diffuseColor + specularColor ) * lambert * lightColor * fragment.color.rgb * shadow;// + rimColor;

1
neo/renderer/RenderSystem_init.cpp
View file

@ -224,6 +224,7 @@ idCVar r_shadowMapSingleSide( "r_shadowMapSingleSide", "-1", CVAR_RENDERER | CVA
idCVar r_shadowMapImageSize( "r_shadowMapImageSize", "1024", CVAR_RENDERER | CVAR_INTEGER, "", 128, 2048 );
idCVar r_shadowMapJitterScale( "r_shadowMapJitterScale", "0.006", CVAR_RENDERER | CVAR_FLOAT, "scale factor for jitter offset" );
idCVar r_shadowMapBiasScale( "r_shadowMapBiasScale", "0.0001", CVAR_RENDERER | CVAR_FLOAT, "scale factor for jitter bias" );
idCVar r_shadowMapRandomizeJitter( "r_shadowMapRandomizeJitter", "1", CVAR_RENDERER | CVAR_BOOL, "randomly offset jitter texture each draw" );
idCVar r_shadowMapSplits( "r_shadowMapSplits", "3", CVAR_RENDERER | CVAR_INTEGER, "number of splits for cascaded shadow mapping with parallel lights", 0, 4 );
idCVar r_shadowMapSplitWeight( "r_shadowMapSplitWeight", "0.9", CVAR_RENDERER | CVAR_FLOAT, "" );
idCVar r_shadowMapLodScale( "r_shadowMapLodScale", "1.4", CVAR_RENDERER | CVAR_FLOAT, "" );

18
neo/renderer/tr_backend_draw.cpp
View file

@ -1280,8 +1280,8 @@ static void RB_RenderInteractions( const drawSurf_t* surfList, const viewLight_t
if( r_useShadowMapping.GetInteger() == 1 )
{
// medium quality
jitterSampleScale = 0.5f;
shadowMapSamples = 4.0f;
jitterSampleScale = 0.8f;
shadowMapSamples = 1.0f;
}
// screen power of two correction factor
@ -1300,8 +1300,16 @@ static void RB_RenderInteractions( const drawSurf_t* surfList, const viewLight_t
SetFragmentParm( RENDERPARM_JITTERTEXSCALE, jitterTexScale ); // rpJitterTexScale
float jitterTexOffset[4];
jitterTexOffset[0] = ( rand() & 255 ) / 255.0;
jitterTexOffset[1] = ( rand() & 255 ) / 255.0;
if( r_shadowMapRandomizeJitter.GetBool() )
{
jitterTexOffset[0] = ( rand() & 255 ) / 255.0;
jitterTexOffset[1] = ( rand() & 255 ) / 255.0;
}
else
{
jitterTexOffset[0] = 0;
jitterTexOffset[1] = 0;
}
jitterTexOffset[2] = 0.0f;
jitterTexOffset[3] = 0.0f;
SetFragmentParm( RENDERPARM_JITTERTEXOFFSET, jitterTexOffset ); // rpJitterTexOffset
@ -1364,7 +1372,7 @@ static void RB_RenderInteractions( const drawSurf_t* surfList, const viewLight_t
if( r_useShadowMapping.GetInteger() == 1 )
{
// medium quality
globalImages->jitterImage4->Bind();
globalImages->jitterImage1->Bind();
}
else
{

1
neo/renderer/tr_local.h
View file

@ -1061,6 +1061,7 @@ extern idCVar r_shadowMapSingleSide;
extern idCVar r_shadowMapImageSize;
extern idCVar r_shadowMapJitterScale;
extern idCVar r_shadowMapBiasScale;
extern idCVar r_shadowMapRandomizeJitter;
extern idCVar r_shadowMapSplits;
extern idCVar r_shadowMapSplitWeight;
extern idCVar r_shadowMapLodScale;