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color_palette_lerp.frag
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#version 120
#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
#define PALETTE_LERP_SIZE 8
// #define PALETTE_LERP_SRGB
// #define PALETTE_LERP_MIX_FNC(A, B, T) mixSpectral(A, B, T)
// #include "lygia/color/mixSpectral.glsl"
// #define PALETTE_LERP_MIX_FNC(A, B, T) mixOklab(A, B, T)
// #include "lygia/color/mixOklab.glsl"
// #define RYB_LERP(A, B, t) mix(A, B, t)
#define PALETTE_LERP_MIX_FNC(A, B, T) mixRYB(A, B, T)
#include "lygia/color/mixRYB.glsl"
#include "lygia/color/palette/pigments.glsl"
#include "lygia/color/palette/pigments/winsor_oil.glsl"
#include "lygia/color/palette/pigments/winsor_acrylic.glsl"
#include "lygia/color/palette/pigments/winsor_gouache.glsl"
#include "lygia/color/palette/pigments/rembrandt_oil.glsl"
#include "lygia/color/palette/pigments/liquitex_acrylic.glsl"
#include "lygia/color/palette/pigments/golden_acrylic.glsl"
#include "lygia/color/palette/pigments/gamblin_oil.glsl"
#include "lygia/color/palette/lerp.glsl"
void main(void) {
vec4 color = vec4(vec3(0.0), 1.0);
vec2 pixel = 1.0/u_resolution.xy;
vec2 st = gl_FragCoord.xy * pixel;
st.y = 1.0 - st.y;
int brand = int(st.x * 4.);
vec3 pigments[PALETTE_LERP_SIZE];
pigments[0] = TITANIUM_WHITE;
pigments[1] = CADMIUM_YELLOW;
pigments[2] = YELLOW_OCHRE;
pigments[3] = CADMIUM_ORANGE;
pigments[4] = CADMIUM_RED;
pigments[5] = COBALT_BLUE;
pigments[6] = BURNT_SIENNA;
pigments[7] = IVORY_BLACK;
vec3 windsor_oil[PALETTE_LERP_SIZE];
windsor_oil[0] = WINDSOR_OIL_TITANIUM_WHITE;
windsor_oil[1] = WINDSOR_OIL_CADMIUM_YELLOW;
windsor_oil[2] = WINDSOR_OIL_YELLOW_OCHRE;
windsor_oil[3] = WINDSOR_OIL_CADMIUM_ORANGE;
windsor_oil[4] = WINDSOR_OIL_CADMIUM_RED;
windsor_oil[5] = WINDSOR_OIL_COBALT_BLUE;
windsor_oil[6] = WINDSOR_OIL_BURNT_SIENNA;
windsor_oil[7] = WINDSOR_OIL_IVORY_BLACK;
vec3 rembrandt_oil[PALETTE_LERP_SIZE];
rembrandt_oil[0] = REMBRANDT_OIL_TITANIUM_WHITE;
rembrandt_oil[1] = REMBRANDT_OIL_CADMIUM_YELLOW;
rembrandt_oil[2] = REMBRANDT_OIL_YELLOW_OCHRE;
rembrandt_oil[3] = REMBRANDT_OIL_CADMIUM_ORANGE;
rembrandt_oil[4] = REMBRANDT_OIL_CADMIUM_RED;
rembrandt_oil[5] = REMBRANDT_OIL_COBALT_BLUE;
rembrandt_oil[6] = REMBRANDT_OIL_BURNT_SIENNA;
rembrandt_oil[7] = REMBRANDT_OIL_IVORY_BLACK;
vec3 gamblin_oil[PALETTE_LERP_SIZE];
gamblin_oil[0] = GAMBLIN_OIL_TITANIUM_WHITE;
gamblin_oil[1] = GAMBLIN_OIL_CADMIUM_YELLOW;
gamblin_oil[2] = GAMBLIN_OIL_YELLOW_OCHRE;
gamblin_oil[3] = GAMBLIN_OIL_CADMIUM_ORANGE;
gamblin_oil[4] = GAMBLIN_OIL_CADMIUM_RED;
gamblin_oil[5] = GAMBLIN_OIL_COBALT_BLUE;
gamblin_oil[6] = GAMBLIN_OIL_BURNT_SIENNA;
gamblin_oil[7] = GAMBLIN_OIL_IVORY_BLACK;
// Default
if (brand == 0)
color.rgb = paletteLerp(pigments, st.y);
// Oils
else if (brand == 1)
color.rgb = paletteLerp(windsor_oil, st.y);
else if (brand == 2)
color.rgb = paletteLerp(rembrandt_oil, st.y);
else if (brand == 3)
color.rgb = paletteLerp(gamblin_oil, st.y);
gl_FragColor = color;
}