R2Refraction.h File Reference

Functions and types to render generic refraction. More...

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Data Structures
struct	R2_refraction_t

Functions
vec4	R2_refractionMasked (const R2_refraction_t refraction, const vec4 position_here_clip, const vec3 delta)

Detailed Description

Functions and types to render generic refraction.

Definition in file R2Refraction.h.

Function Documentation

R2_refractionMasked()

vec4 R2_refractionMasked	(	const R2_refraction_t	refraction,
		const vec4	position_here_clip,
		const vec3	delta
	)

Calculate masked refraction using a given delta vector.

Parameters

refraction	Basic refraction parameters
position_here_clip	The clip-space coordinates of the surface
delta	The delta vector

Returns

A refracted sample

Definition at line 30 of file R2Refraction.h.

{
  vec3 delta_scaled = delta * refraction.scale;

  vec3 position_here_ndc = vec3 (position_here_clip.xyz / position_here_clip.w);
  vec2 position_here_uv  = (position_here_ndc.xy + 1.0) * 0.5;

  vec3 position_there_ndc = position_here_ndc + delta_scaled;
  vec2 position_there_uv  = (position_there_ndc.xy + 1.0) * 0.5;

  vec4 scene_there = texture (refraction.scene, position_there_uv);
  float mask       = texture (refraction.mask,  position_there_uv).x;
  vec4 scene_here  = texture (refraction.scene, position_here_uv);

  return mix (scene_here, scene_there, mask) * vec4 (refraction.color, 1.0);
}