R2BoxBlur.h File Reference

Functions for performing box blurs. More...

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Functions
vec4	R2_boxBlurVertical4f (const sampler2D t, const vec2 uv, const float size)
vec4	R2_boxBlurHorizontal4f (const sampler2D t, const vec2 uv, const float size)

Variables
const float	R2_boxBlurGaussWeight2 = 0.0702702703
const float	R2_boxBlurGaussOffset2 = 3.2307692308
const float	R2_boxBlurGaussWeight1 = 0.3162162162
const float	R2_boxBlurGaussOffset1 = 1.3846153846
const float	R2_boxBlurGaussWeight0 = 0.2270270270

Detailed Description

Functions for performing box blurs.

Definition in file R2BoxBlur.h.

Function Documentation

R2_boxBlurHorizontal4f()

vec4 R2_boxBlurHorizontal4f	(	const sampler2D	t,
		const vec2	uv,
		const float	size
	)

Perform a single horizontal blur sample for texel uv in t.

Parameters

t	A texture
uv	The coordinates of the current texel
size	The blur size

Definition at line 61 of file R2BoxBlur.h.

{
  float size_inv = 1.0 / size;
  float x;
  vec2 c;

  vec4 sum = textureLod (t, uv, 0.0) * R2_boxBlurGaussWeight0;

  x = uv.x + (size_inv * R2_boxBlurGaussOffset1);
  c = vec2 (x, uv.y);
  sum += textureLod (t, c, 0.0) * R2_boxBlurGaussWeight1;

  x = uv.x + (size_inv * R2_boxBlurGaussOffset2);
  c = vec2 (x, uv.y);
  sum += textureLod (t, c, 0.0) * R2_boxBlurGaussWeight2;

  x = uv.x - (size_inv * R2_boxBlurGaussOffset1);
  c = vec2 (x, uv.y);
  sum += textureLod (t, c, 0.0) * R2_boxBlurGaussWeight1;

  x = uv.x - (size_inv * R2_boxBlurGaussOffset2);
  c = vec2 (x, uv.y);
  sum += textureLod (t, c, 0.0) * R2_boxBlurGaussWeight2;

  return sum;
}

R2_boxBlurVertical4f()

vec4 R2_boxBlurVertical4f	(	const sampler2D	t,
		const vec2	uv,
		const float	size
	)

Perform a single vertical blur sample for texel uv in t.

Parameters

t	A texture
uv	The coordinates of the current texel
size	The blur size

Definition at line 22 of file R2BoxBlur.h.

{
  float size_inv = 1.0 / size;
  float y;
  vec2 c;

  vec4 sum = textureLod (t, uv, 0.0) * R2_boxBlurGaussWeight0;

  y = uv.y + (size_inv * R2_boxBlurGaussOffset1);
  c = vec2 (uv.x, y);
  sum += textureLod (t, c, 0.0) * R2_boxBlurGaussWeight1;

  y = uv.y + (size_inv * R2_boxBlurGaussOffset2);
  c = vec2 (uv.x, y);
  sum += textureLod (t, c, 0.0) * R2_boxBlurGaussWeight2;

  y = uv.y - (size_inv * R2_boxBlurGaussOffset1);
  c = vec2 (uv.x, y);
  sum += textureLod (t, c, 0.0) * R2_boxBlurGaussWeight1;

  y = uv.y - (size_inv * R2_boxBlurGaussOffset2);
  c = vec2 (uv.x, y);
  sum += textureLod (t, c, 0.0) * R2_boxBlurGaussWeight2;

  return sum;
}