您最多选择25个主题
主题必须以中文或者字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符
42 行
1.7 KiB
42 行
1.7 KiB
// Code written by Landon Townsend
|
|
|
|
void MainLightBlurShadow_half(half rand, half fadeTightness, SamplerState pointClamp, half blurRadius, half3 worldPos, out half shadowAtten)
|
|
{
|
|
#if SHADERGRAPH_PREVIEW
|
|
shadowAtten = 1;
|
|
#else
|
|
const int NUM_STEPS = 10;
|
|
float oneDivNumSteps = 1.0 / NUM_STEPS;
|
|
Light mainLight = GetMainLight();
|
|
shadowAtten = 1;
|
|
ShadowSamplingData shadowSamplingData = GetMainLightShadowSamplingData();
|
|
for (int i = NUM_STEPS / 4; i < NUM_STEPS; i++)
|
|
{
|
|
//Instead of sampling the position of the current pixel, sample a point that's a i steps away, in a semi-randomized direction
|
|
//the starting direction is randomized and then the direction is rotated by "i" radians every iteration
|
|
half3 newWorldPos = worldPos + half3(sin(rand + i), 0, cos(rand + i)) * i * oneDivNumSteps * blurRadius;
|
|
#if SHADOWS_SCREEN
|
|
half4 clipPos = TransformWorldToHClip(newWorldPos);
|
|
half4 shadowCoord = ComputeScreenPos(clipPos);
|
|
#else
|
|
half4 shadowCoord = TransformWorldToShadowCoord(newWorldPos);
|
|
#endif
|
|
#ifdef _MAIN_LIGHT_SHADOWS_CASCADE
|
|
half cascadeIndex = ComputeCascadeIndex(newWorldPos);
|
|
#else
|
|
half cascadeIndex = 0;
|
|
#endif
|
|
#if !defined(MAIN_LIGHT_CALCULATE_SHADOWS)
|
|
float shadowMapSample = 1.0;
|
|
#else
|
|
float shadowMapSample = SAMPLE_TEXTURE2D_SHADOW(_MainLightShadowmapTexture, sampler_MainLightShadowmapTexture, shadowCoord.xyz);
|
|
#endif
|
|
//0 or 1 depending on whether a shadow is being cast
|
|
float isInShadow = 1 - shadowMapSample;
|
|
|
|
shadowAtten -= isInShadow * oneDivNumSteps;
|
|
// If the position is out of shadow distance, just return 1
|
|
shadowAtten = BEYOND_SHADOW_FAR(shadowCoord) ? 1.0 : saturate(shadowAtten);
|
|
}
|
|
#endif
|
|
}
|