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August 5, 2020 20:14
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a sprite shader for THREE.js which doesn't need to clone textures, by storing its own repeat/offset
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| import THREE from "lib/three"; | |
| const params = ` | |
| varying vec2 vUv; | |
| uniform vec2 offset; | |
| uniform vec2 repeat; | |
| uniform sampler2D texture; | |
| uniform vec3 color; | |
| ` | |
| const vertexShader = ` | |
| ${params} | |
| void main() { | |
| vUv = uv * repeat + offset; | |
| gl_Position = projectionMatrix * | |
| modelViewMatrix * | |
| vec4(position,1.0); | |
| }`; | |
| const fragmentShader = ` | |
| ${params} | |
| void main(void) { | |
| gl_FragColor = texture2D(texture, vUv) * vec4(color, 1.0); | |
| } | |
| `; | |
| export default function unlitSpriteShaderMaterial(texture, color) { | |
| let mat = new THREE.ShaderMaterial({ | |
| uniforms: { | |
| texture: {type: "t", value: texture}, | |
| offset: {type: "v2", value: new THREE.Vector2()}, | |
| repeat: {type: "v2", value: new THREE.Vector2()}, | |
| color: {type: "c", value: new THREE.Color(color)}, | |
| }, | |
| vertexShader: vertexShader, | |
| fragmentShader: fragmentShader, | |
| }); | |
| mat.offset = mat.uniforms.offset.value; | |
| mat.repeat = mat.uniforms.repeat.value; | |
| mat.color = mat.uniforms.color.value; | |
| mat.transparent = true; | |
| return mat; | |
| } |
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