# <vgl-shader-material>
# Example Usage
<template>
<div>
<vgl-renderer antialias>
<template #scene>
<vgl-scene>
<vgl-mesh>
<template #geometry>
<vgl-icosahedron-geometry
:radius="1"
:detail="5"
/>
</template>
<template #material>
<vgl-shader-material
:wireframe="wireframe"
:defines="defines"
:uniforms="uniforms"
:vertex-shader="vertexShader"
:fragment-shader="fragmentShader"
/>
</template>
</vgl-mesh>
</vgl-scene>
</template>
<template #camera>
<vgl-perspective-camera
position="spherical"
:position-radius="5"
:position-phi="0.8"
:position-theta="0.2"
rotation="lookAt"
/>
</template>
</vgl-renderer>
<aside class="control-panel">
<section>
<h3>Shaders</h3>
<label>
Vertex Shader <button @click="vertShaderShown = !vertShaderShown">
{{ vertShaderShown ? 'Hide' : 'Show' }}
</button>
<textarea
v-show="vertShaderShown"
v-model="vertexShader"
rows="14"
cols="50"
/>
</label>
<label>
Fragment Shader <button @click="fragShaderShown = !fragShaderShown">
{{ fragShaderShown ? 'Hide' : 'Show' }}
</button>
<textarea
v-show="fragShaderShown"
v-model="fragmentShader"
rows="14"
cols="50"
/>
</label>
</section>
<section>
<h3>Vert Shader Uniforms</h3>
<table>
<tr>
<td>Offset</td><td>
<input
v-model.number="waveOffset"
type="range"
max="2"
step="0.01"
>
</td>
</tr>
<tr>
<td>Amplitude</td><td>
<input
v-model.number="waveAmp"
type="range"
max="2"
step="0.01"
>
</td>
</tr>
<tr>
<td>Frequency</td><td>
<input
v-model.number="waveFreq"
type="range"
max="50"
>
</td>
</tr>
</table>
<label>
<h3>Frag Shader Uniforms</h3>
Frag Color
<select v-model.number="displayColor">
<option
value="0"
selected
>Cartesian</option>
<option value="1">Spherical</option>
<option value="2">Depth</option>
</select>
</label>
<label>
<h3>Defines</h3>
Scale
<input
v-model.number="scale"
type="range"
min="0.2"
step="0.1"
max="10"
>
</label>
<label>
<h3>Options</h3>
Wireframe
<input
v-model="wireframe"
type="checkbox"
>
</label>
</section>
</aside>
</div>
</template>
<script>
import * as components from 'vue-gl';
const fragmentShader = `
uniform int displayColor;
varying vec4 vSpherical;
varying vec4 vCartesian;
void main() {
if (displayColor == COLOR_CARTESIAN) {
gl_FragColor = vCartesian;
} else if (displayColor == COLOR_SPHERICAL) {
gl_FragColor = vSpherical;
} else if (displayColor == COLOR_DEPTH) {
float depth = gl_FragCoord.z * gl_FragCoord.w;
gl_FragColor = vec4(vec3(depth), 1.0);
}
}
`;
const vertexShader = `
uniform float waveOffset;
uniform float waveAmp;
uniform float waveFreq;
varying vec4 vCartesian;
varying vec4 vSpherical;
void main() {
float r = length(position);
float theta = acos(position.y / r); // inclination
float phi = atan(position.z, position.x); // azimuth
float finalR = r + sin((theta + waveOffset) * waveFreq) * waveAmp;
vec4 finalPos = vec4(
finalR * sin(theta) * cos(phi),
finalR * cos(theta),
finalR * sin(theta) * sin(phi),
1.0 / SCALE
);
gl_Position = projectionMatrix * modelViewMatrix * finalPos;
const float PI = 3.141592654;
vCartesian = finalPos;
vSpherical = vec4( // normalize values to [0, 1]
r,
theta / PI,
((phi / PI) + 1.0) / 2.0,
1.0
);
}
`;
export default {
components,
data: () => ({
scale: 1.0,
waveOffset: 0.0,
waveAmp: 0.2,
waveFreq: 10,
displayColor: 0,
vertexShader,
fragmentShader,
vertShaderShown: false,
fragShaderShown: false,
wireframe: true,
}),
computed: {
defines() {
return {
COLOR_CARTESIAN: 0,
COLOR_SPHERICAL: 1,
COLOR_DEPTH: 2,
SCALE: Number.isInteger(this.scale) ? `${this.scale}.0` : this.scale,
};
},
uniforms() {
return {
waveOffset: { value: this.waveOffset },
waveAmp: { value: this.waveAmp },
waveFreq: { value: this.waveFreq },
displayColor: { value: this.displayColor },
};
},
},
};
</script>
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# Props
name: string
An arbitrary name of the instance.
Defaults to [object Object]side: front | back | double
Defines which side of faces will be rendered.
Defaults to [object Object]vertexColors: boolean
Defines whether vertex coloring is used.defines: object
Custom defines to be injected into the shader.
Defaults to [object Object]fog: boolean
Whether the material color is affected by global fog settings.fragmentShader: string
The fragment shader GLSL code.
Defaults to [object Object]uniforms: object
An uniform definition object. To trigger re-rendering properly, you should pass a new object rather than overwriting the originally passed object.
Defaults to [object Object]vertexShader: string
The vertex shader GLSL code.
Defaults to [object Object]wireframe: boolean
Whether geometries to be rendered as wireframe or not.