Post-processing filters

Korender supports post-processing effects that can be applied to the rendered scene. The post-processing pipeline operates as follows:

• The scene is first rendered to a framebuffer, capturing both color and depth as target textures.
• Each post-processing effect renders a full-screen quad using a dedicated shader, utilizing color and depth data from the original scene or the output of the previous effect.
• The final post-processing effect renders directly to the screen.

To define a post-processing effect in your frame, use the PostProcess function. It accepts either a PostProcessingMaterial or a PostProcessingEffect:

Frame {
    PostProcess(blurHorz(radius = 3.0f))
    PostProcess(blurVert(radius = 3.0f))
}

PostProcess also accepts an optional block to render geometry after the effect:

PostProcess(material = fxaa()) {
    // geometry rendered after FXAA
}

Korender includes the following built-in post-processing filters:

Post-process filter	Signature	Description
blur	blur(radius: Float): PostProcessingEffect	Gaussian blur as a standalone effect
blurHorz	blurHorz(radius: Float): PostProcessingMaterial	Horizontal separable Gaussian blur pass
blurVert	blurVert(radius: Float): PostProcessingMaterial	Vertical separable Gaussian blur pass
adjust	adjust(brightness, contrast, saturation): PostProcessingMaterial	Adjust brightness, contrast and saturation
water	water(waterColor, transparency, waveScale, waveMagnitude, sky): PostProcessingMaterial	Water surface with waves (sky: SkyMaterial is required)
fog	fog(density, color): PostProcessingMaterial	Fog effect
fxaa	fxaa(): PostProcessingMaterial	FXAA anti-aliasing filter
customPostProcessingFilter	customPostProcessingFilter(fragmentShaderFile, block): PostProcessingMaterial	Custom post-processing shader