This group documents the GLSL functions fastuidraw makes available to GLSL code fragments for only fragment shader for custom shading as embodied by the classes fastuidraw::glsl::PainterItemShaderGLSL, fastuidraw::glsl::PainterBlendShaderGLSL and fastuidraw::glsl::PainterBrushShaderGLSL. More...

Functions
float	fastuidraw_banded_rays_compute_coverage (in uint glyph_data_location, in vec2 glyph_coord, in vec2 glyph_coord_fwidth, in uint num_vertical_bands, in uint num_horizontal_bands, in bool use_odd_even_rule)

vec3	fastuidraw_clipcolor (in vec3 C)
	clip an RGB value so that its luminosity is within the range fastuidraw_compute_min() and fastuidraw_compute_max().

float	fastuidraw_color_burn (in float S, in float D)
	perform color burn blending on a single color channel More...

float	fastuidraw_color_dodge (in float S, in float D)
	perform color dodge blending on a single color channel More...

float	fastuidraw_compute_luminosity (in vec3 C)
	compute the luminosity of an RGB value

float	fastuidraw_compute_max (in vec3 C)
	Compute the maximum color channel value.

float	fastuidraw_compute_min (in vec3 C)
	Compute the minimum color channel value.

float	fastuidraw_compute_saturation (in vec3 C)
	compute the saturation of an RGB value

float	fastuidraw_hardlight (in float S, in float D)
	perform hardlight blending on a single color channel More...

float	fastuidraw_overlay (in float S, in float D)
	perform overlay blending on a single color channel More...

float	fastuidraw_restricted_rays_compute_coverage (in uint glyph_data_location, in vec2 glyph_coord, in vec2 glyph_coord_dx, in vec2 glyph_coord_dy, in bool use_odd_even_rule)

vec3	fastuidraw_set_luminosity (in vec3 C, in vec3 L)

vec3	fastuidraw_set_saturation_and_luminosity (in vec3 C, in vec3 S, in vec3 L)

float	fastuidraw_softlight (in float S, in float D)
	perform softlight blending on a single color channel More...

vec3	fastuidraw_undo_alpha (in vec4 S)
	Undo pre-multiply by alpha on the RGB channels of a color value.

Detailed Description

This group documents the GLSL functions fastuidraw makes available to GLSL code fragments for only fragment shader for custom shading as embodied by the classes fastuidraw::glsl::PainterItemShaderGLSL, fastuidraw::glsl::PainterBlendShaderGLSL and fastuidraw::glsl::PainterBrushShaderGLSL.

Function Documentation

◆ fastuidraw_banded_rays_compute_coverage()

float fastuidraw_banded_rays_compute_coverage	(	in uint	glyph_data_location,
		in vec2	glyph_coord,
		in vec2	glyph_coord_fwidth,
		in uint	num_vertical_bands,
		in uint	num_horizontal_bands,
		in bool	use_odd_even_rule
	)

Compute the coverage of a fragment within a fastuidraw::GlyphRenderDataBandedRays glyph.

Parameters

glyph_data_location	location of the glyph data (see fastuidraw::GlyphRenderDataBandedRays::glyph_offset)
glyph_coord	the coordinate of the fragment in glyph coordinates
glyph_coord_fwidth	the value of fwidth(glyph_coord)
num_vertical_bands	the number of vertical bands of the glyph, see fastuidraw::GlyphRenderDataBandedRays::glyph_num_vertical_bands
num_horizontal_bands	the number of horizontal bands of the glyph, see fastuidraw::GlyphRenderDataBandedRays::glyph_num_horizontal_bands
use_odd_even_rule	if true, use the odd-even fill rule, otherwise use the non-zero fill rule.

Definition at line 251 of file fastuidraw_banded_rays.glsl.hpp.

◆ fastuidraw_color_burn()

float fastuidraw_color_burn	(	in float	S,
		in float	D
	)

perform color burn blending on a single color channel

Parameters

S	Source input value
D	Destination input value

Definition at line 219 of file fastuidraw_blend_util.frag.glsl.hpp.

◆ fastuidraw_color_dodge()

float fastuidraw_color_dodge	(	in float	S,
		in float	D
	)

perform color dodge blending on a single color channel

Parameters

S	Source input value
D	Destination input value

Definition at line 196 of file fastuidraw_blend_util.frag.glsl.hpp.

◆ fastuidraw_hardlight()

float fastuidraw_hardlight	(	in float	S,
		in float	D
	)

perform hardlight blending on a single color channel

Parameters

S	Source input value
D	Destination input value

Definition at line 177 of file fastuidraw_blend_util.frag.glsl.hpp.

◆ fastuidraw_overlay()

float fastuidraw_overlay	(	in float	S,
		in float	D
	)

perform overlay blending on a single color channel

Parameters

S	Source input value
D	Destination input value

Definition at line 140 of file fastuidraw_blend_util.frag.glsl.hpp.

◆ fastuidraw_restricted_rays_compute_coverage()

float fastuidraw_restricted_rays_compute_coverage	(	in uint	glyph_data_location,
		in vec2	glyph_coord,
		in vec2	glyph_coord_dx,
		in vec2	glyph_coord_dy,
		in bool	use_odd_even_rule
	)

Compute the coverage of a fragment within a fastuidraw::GlyphRenderDataRestrictedRays glyph.

Parameters

glyph_data_location	location of the glyph data (see fastuidraw::GlyphRenderDataRestrictedRays::glyph_offset)
glyph_coord	the coordinate of the fragment in glyph coordinates
glyph_coord_dx	the value of dFdx(glyph_coord)
glyph_coord_dy	the value of dFdy(glyph_coord)
use_odd_even_rule	if true, use the odd-even fill rule, otherwise use the non-zero fill rule.

◆ fastuidraw_set_luminosity()

vec3 fastuidraw_set_luminosity	(	in vec3	C,
		in vec3	L
	)

Return an RGB color value generate from taking the chroma of one color value and the luminosity of another

Parameters

C	color value from which to take the chroma value
L	color value from which to take the luminosity value

Definition at line 87 of file fastuidraw_blend_util.frag.glsl.hpp.

◆ fastuidraw_set_saturation_and_luminosity()

vec3 fastuidraw_set_saturation_and_luminosity	(	in vec3	C,
		in vec3	S,
		in vec3	L
	)

Return an RGB color value generate from taking the chroma of one color value and the luminosity and saturation of other color values

Parameters

C	color value from which to take the chroma value
S	color value from which to take the saturation value
L	color value from which to take the luminosity value

Definition at line 104 of file fastuidraw_blend_util.frag.glsl.hpp.