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phase parameter for grating functions is now multiples of those function's periods

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lgtst 2022-04-12 14:29:55 +03:00
parent b0c7493a57
commit c6aacad99c
5 changed files with 13 additions and 9 deletions
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5
src/visual/GratingStim.js
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@ -40,7 +40,7 @@ import raisedCosShader from "./shaders/raisedCosShader.frag";
* @param {String | HTMLImageElement} [options.mask] - the name of the mask resource or HTMLImageElement corresponding to the mask
* @param {String} [options.units= "norm"] - the units of the stimulus (e.g. for size, position, vertices)
* @param {number} [options.sf=1.0] - spatial frequency of the function used in grating stimulus
* @param {number} [options.phase=1.0] - phase of the function used in grating stimulus
* @param {number} [options.phase=0.0] - phase of the function used in grating stimulus, multiples of period of that function
* @param {Array.<number>} [options.pos= [0, 0]] - the position of the center of the stimulus
* @param {number} [options.ori= 0.0] - the orientation (in degrees)
* @param {number} [options.size] - the size of the rendered image (DEFAULT_STIM_SIZE_PX will be used if size is not specified)
@ -142,7 +142,8 @@ export class GratingStim extends util.mix(VisualStim).with(ColorMixin)
shader: sinShader,
uniforms: {
uFreq: 1.0,
uPhase: 0.0
uPhase: 0.0,
uColor: [.5, 0, .5]
}
},
sqr: {

5
src/visual/shaders/sinShader.frag
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@ -18,9 +18,10 @@ out vec4 shaderOut;
#define M_PI 3.14159265358979
uniform float uFreq;
uniform float uPhase;
uniform vec3 uColor;
void main() {
vec2 uv = vUvs;
float s = sin(uFreq * uv.x * 2. * M_PI + uPhase);
shaderOut = vec4(.5 + .5 * vec3(s), 1.0);
float s = sin((uFreq * uv.x + uPhase) * 2. * M_PI);
shaderOut = vec4((.5 + .5 * vec3(s)) * uColor, 1.0);
}

5
src/visual/shaders/sinXsinShader.frag
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@ -16,13 +16,14 @@ in vec2 vUvs;
out vec4 shaderOut;
#define M_PI 3.14159265358979
#define PI2 2.* M_PI
uniform float uFreq;
uniform float uPhase;
void main() {
vec2 uv = vUvs;
float sx = sin(uFreq * uv.x * 2. * M_PI + uPhase);
float sy = sin(uFreq * uv.y * 2. * M_PI + uPhase);
float sx = sin((uFreq * uv.x + uPhase) * PI2);
float sy = sin((uFreq * uv.y + uPhase) * PI2);
float s = sx * sy * .5 + .5;
shaderOut = vec4(vec3(s), 1.0);
}

2
src/visual/shaders/sqrShader.frag
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@ -21,6 +21,6 @@ uniform float uPhase;
void main() {
vec2 uv = vUvs;
float s = sign(sin(uFreq * uv.x * 2. * M_PI + uPhase));
float s = sign(sin((uFreq * uv.x + uPhase) * 2. * M_PI));
shaderOut = vec4(.5 + .5 * vec3(s), 1.0);
}

5
src/visual/shaders/sqrXsqrShader.frag
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@ -16,13 +16,14 @@ in vec2 vUvs;
out vec4 shaderOut;
#define M_PI 3.14159265358979
#define PI2 2.* M_PI
uniform float uFreq;
uniform float uPhase;
void main() {
vec2 uv = vUvs;
float sx = sign(sin(uFreq * uv.x * 2. * M_PI + uPhase));
float sy = sign(sin(uFreq * uv.y * 2. * M_PI + uPhase));
float sx = sign(sin((uFreq * uv.x + uPhase) * PI2));
float sy = sign(sin((uFreq * uv.y + uPhase) * PI2));
float s = sx * sy * .5 + .5;
shaderOut = vec4(vec3(s), 1.0);
}