HLSL - how to streamline this shadow map filter? Hey everyone, I have the following loop in my main shader which samples my shadow map with a 3x3 PCF grid to achieve anti-aliased shadows: int shadowFactor = 0; for (int y = -1; y <= 1; y++) { for (int x = -1; x <= 1; x++) { float2 shadowSampleOffset = float2(x/ShadowMapSize, y/ShadowMapSize); if (tex2D(ShadowMapTextureSampler, projectedTextureCoordinatesLight + shadowSampleOffset).r < input.ProjectedPositionLight.z - 0.002f) { shadowFactor += 1; } } } float lightingCorrectionFactor = 1 - shadowFactor/9.0f; diffuseLightingFactor *= lightingCorrectionFactor; specularLightingFactor *= lightingCorrectionFactor; ...however, it always pushes the number of instructions up to the point where I normally need to use a higher shader model (in MonoGame, it causes me to go from the default 4_0_level_9_1 up to 4_0_level_9_3). Can anyone see a more obvious and efficient way to do the PCF operation? Thanks! https://ift.tt/eA8V8J

Hey everyone, I have the following loop in my main shader which samples my shadow map with a 3x3 PCF grid to achieve anti-aliased shadows: int shadowFactor = 0; for (int y = -1; y <= 1; y++) { for (int x = -1; x <= 1; x++) { float2 shadowSampleOffset = float2(x/ShadowMapSize, y/ShadowMapSize); if (tex2D(ShadowMapTextureSampler, projectedTextureCoordinatesLight + shadowSampleOffset).r < input.ProjectedPositionLight.z - 0.002f) { shadowFactor += 1; } } } float lightingCorrectionFactor = 1 - shadowFactor/9.0f; diffuseLightingFactor *= lightingCorrectionFactor; specularLightingFactor *= lightingCorrectionFactor; ...however, it always pushes the number of instructions up to the point where I normally need to use a higher shader model (in MonoGame, it causes me to go from the default 4_0_level_9_1 up to 4_0_level_9_3). Can anyone see a more obvious and efficient way to do the PCF operation? Thanks!

from GameDev.net https://ift.tt/3293c1m