public RenderTexture ApplyToAndReturn(RenderTexture source, SleekRenderSettings settings)
{
Vector4 luminanceThreshold = HelperExtensions.GetLuminanceThreshold(settings);
// Changing current Luminance Const value just to make sure that we have the latest settings in our Uniforms
_brightpassBlurMaterial.SetVector(Uniforms._LuminanceThreshold, luminanceThreshold);
_brightpassBlurMaterial.SetVector(Uniforms._TexelSize, new Vector2(1f / _blurTextures[0].width, 1f / _blurTextures[0].height));
var currentTargetRenderTexture = _blurTextures[0];
var previousTargetRenderTexture = _blurTextures[0];
var passes = _blurTextures.Length;
for (int i = 0; i < passes; i++)
{
currentTargetRenderTexture = _blurTextures[i];
// We use a different material for the first blur pass
if (i == 0)
{
// Applying downsample + brightpass (stored in Alpha)
_renderer.Blit(source, currentTargetRenderTexture, _brightpassBlurMaterial);
}
else
{
_downsampleBlurMaterial.SetVector(Uniforms._TexelSize, new Vector2(1f / currentTargetRenderTexture.width, 1f / currentTargetRenderTexture.height));
// Applying only blur to our already brightpassed texture
_renderer.Blit(previousTargetRenderTexture, currentTargetRenderTexture, _downsampleBlurMaterial);
}
previousTargetRenderTexture = currentTargetRenderTexture;
}
return(currentTargetRenderTexture);
}
private void Precompose(RenderTexture source, bool isBloomEnabled)
{
// Setting up vignette effect
var isVignetteEnabledInSettings = settings.vignetteEnabled;
if (isVignetteEnabledInSettings && !_isVignetteAlreadyEnabled)
{
_preComposeMaterial.EnableKeyword(Keywords.VIGNETTE_ON);
_isVignetteAlreadyEnabled = true;
}
else if (!isVignetteEnabledInSettings && _isVignetteAlreadyEnabled)
{
_preComposeMaterial.DisableKeyword(Keywords.VIGNETTE_ON);
_isVignetteAlreadyEnabled = false;
}
if (isVignetteEnabledInSettings)
{
// Calculating Vignette parameters once per frame rather than once per pixel
float vignetteBeginRadius = settings.vignetteBeginRadius;
float squareVignetteBeginRaduis = vignetteBeginRadius * vignetteBeginRadius;
float vignetteRadii = vignetteBeginRadius + settings.vignetteExpandRadius;
float oneOverVignetteRadiusDistance = 1f / (vignetteRadii - squareVignetteBeginRaduis);
var vignetteColor = settings.vignetteColor;
_preComposeMaterial.SetVector(Uniforms._VignetteShape, new Vector4(
4f * oneOverVignetteRadiusDistance * oneOverVignetteRadiusDistance,
-oneOverVignetteRadiusDistance * squareVignetteBeginRaduis));
// Premultiplying Alpha of vignette color
_preComposeMaterial.SetColor(Uniforms._VignetteColor, new Color(
vignetteColor.r * vignetteColor.a,
vignetteColor.g * vignetteColor.a,
vignetteColor.b * vignetteColor.a,
vignetteColor.a));
}
// Bloom is handled in two different passes (two blurring bloom passes and one precompose pass)
// So we need to check for whether it's enabled in precompose step too (shader has variants without bloom)
if (isBloomEnabled)
{
_preComposeMaterial.SetTexture(Uniforms._BloomTex, _bloomResultTexture);
_preComposeMaterial.SetFloat(Uniforms._BloomIntencity, settings.bloomIntensity);
_preComposeMaterial.SetColor(Uniforms._BloomTint, settings.bloomTint);
if (!_isBloomAlreadyEnabled)
{
_preComposeMaterial.EnableKeyword(Keywords.BLOOM_ON);
_isBloomAlreadyEnabled = true;
}
}
else if (_isBloomAlreadyEnabled)
{
_preComposeMaterial.DisableKeyword(Keywords.BLOOM_ON);
_isBloomAlreadyEnabled = false;
}
var sourceRenderTexture = isBloomEnabled ? _bloomResultTexture : source;
// Finally applying precompose step. It slaps bloom and vignette together
_passRenderer.Blit(sourceRenderTexture, _preComposeTexture, _preComposeMaterial);
}