Initial project import

node_modules/three-stdlib/misc/GPUComputationRenderer.js

@@ -0,0 +1,206 @@
+import { Scene, Camera, Mesh, PlaneGeometry, ShaderMaterial, WebGLRenderTarget, RGBAFormat, DataTexture, FloatType, NoToneMapping, NearestFilter, ClampToEdgeWrapping } from "three";
+class GPUComputationRenderer {
+  constructor(sizeX, sizeY, renderer) {
+    this.variables = [];
+    this.currentTextureIndex = 0;
+    let dataType = FloatType;
+    const scene = new Scene();
+    const camera = new Camera();
+    camera.position.z = 1;
+    const passThruUniforms = {
+      passThruTexture: { value: null }
+    };
+    const passThruShader = createShaderMaterial(getPassThroughFragmentShader(), passThruUniforms);
+    const mesh = new Mesh(new PlaneGeometry(2, 2), passThruShader);
+    scene.add(mesh);
+    this.setDataType = function(type) {
+      dataType = type;
+      return this;
+    };
+    this.addVariable = function(variableName, computeFragmentShader, initialValueTexture) {
+      const material = this.createShaderMaterial(computeFragmentShader);
+      const variable = {
+        name: variableName,
+        initialValueTexture,
+        material,
+        dependencies: null,
+        renderTargets: [],
+        wrapS: null,
+        wrapT: null,
+        minFilter: NearestFilter,
+        magFilter: NearestFilter
+      };
+      this.variables.push(variable);
+      return variable;
+    };
+    this.setVariableDependencies = function(variable, dependencies) {
+      variable.dependencies = dependencies;
+    };
+    this.init = function() {
+      if (renderer.capabilities.isWebGL2 === false && renderer.extensions.has("OES_texture_float") === false) {
+        return "No OES_texture_float support for float textures.";
+      }
+      if (renderer.capabilities.maxVertexTextures === 0) {
+        return "No support for vertex shader textures.";
+      }
+      for (let i = 0; i < this.variables.length; i++) {
+        const variable = this.variables[i];
+        variable.renderTargets[0] = this.createRenderTarget(
+          sizeX,
+          sizeY,
+          variable.wrapS,
+          variable.wrapT,
+          variable.minFilter,
+          variable.magFilter
+        );
+        variable.renderTargets[1] = this.createRenderTarget(
+          sizeX,
+          sizeY,
+          variable.wrapS,
+          variable.wrapT,
+          variable.minFilter,
+          variable.magFilter
+        );
+        this.renderTexture(variable.initialValueTexture, variable.renderTargets[0]);
+        this.renderTexture(variable.initialValueTexture, variable.renderTargets[1]);
+        const material = variable.material;
+        const uniforms = material.uniforms;
+        if (variable.dependencies !== null) {
+          for (let d = 0; d < variable.dependencies.length; d++) {
+            const depVar = variable.dependencies[d];
+            if (depVar.name !== variable.name) {
+              let found = false;
+              for (let j = 0; j < this.variables.length; j++) {
+                if (depVar.name === this.variables[j].name) {
+                  found = true;
+                  break;
+                }
+              }
+              if (!found) {
+                return "Variable dependency not found. Variable=" + variable.name + ", dependency=" + depVar.name;
+              }
+            }
+            uniforms[depVar.name] = { value: null };
+            material.fragmentShader = "\nuniform sampler2D " + depVar.name + ";\n" + material.fragmentShader;
+          }
+        }
+      }
+      this.currentTextureIndex = 0;
+      return null;
+    };
+    this.compute = function() {
+      const currentTextureIndex = this.currentTextureIndex;
+      const nextTextureIndex = this.currentTextureIndex === 0 ? 1 : 0;
+      for (let i = 0, il = this.variables.length; i < il; i++) {
+        const variable = this.variables[i];
+        if (variable.dependencies !== null) {
+          const uniforms = variable.material.uniforms;
+          for (let d = 0, dl = variable.dependencies.length; d < dl; d++) {
+            const depVar = variable.dependencies[d];
+            uniforms[depVar.name].value = depVar.renderTargets[currentTextureIndex].texture;
+          }
+        }
+        this.doRenderTarget(variable.material, variable.renderTargets[nextTextureIndex]);
+      }
+      this.currentTextureIndex = nextTextureIndex;
+    };
+    this.getCurrentRenderTarget = function(variable) {
+      return variable.renderTargets[this.currentTextureIndex];
+    };
+    this.getAlternateRenderTarget = function(variable) {
+      return variable.renderTargets[this.currentTextureIndex === 0 ? 1 : 0];
+    };
+    this.dispose = function() {
+      mesh.geometry.dispose();
+      mesh.material.dispose();
+      const variables = this.variables;
+      for (let i = 0; i < variables.length; i++) {
+        const variable = variables[i];
+        if (variable.initialValueTexture)
+          variable.initialValueTexture.dispose();
+        const renderTargets = variable.renderTargets;
+        for (let j = 0; j < renderTargets.length; j++) {
+          const renderTarget = renderTargets[j];
+          renderTarget.dispose();
+        }
+      }
+    };
+    function addResolutionDefine(materialShader) {
+      materialShader.defines.resolution = "vec2( " + sizeX.toFixed(1) + ", " + sizeY.toFixed(1) + " )";
+    }
+    this.addResolutionDefine = addResolutionDefine;
+    function createShaderMaterial(computeFragmentShader, uniforms) {
+      uniforms = uniforms || {};
+      const material = new ShaderMaterial({
+        uniforms,
+        vertexShader: getPassThroughVertexShader(),
+        fragmentShader: computeFragmentShader
+      });
+      addResolutionDefine(material);
+      return material;
+    }
+    this.createShaderMaterial = createShaderMaterial;
+    this.createRenderTarget = function(sizeXTexture, sizeYTexture, wrapS, wrapT, minFilter, magFilter) {
+      sizeXTexture = sizeXTexture || sizeX;
+      sizeYTexture = sizeYTexture || sizeY;
+      wrapS = wrapS || ClampToEdgeWrapping;
+      wrapT = wrapT || ClampToEdgeWrapping;
+      minFilter = minFilter || NearestFilter;
+      magFilter = magFilter || NearestFilter;
+      const renderTarget = new WebGLRenderTarget(sizeXTexture, sizeYTexture, {
+        wrapS,
+        wrapT,
+        minFilter,
+        magFilter,
+        format: RGBAFormat,
+        type: dataType,
+        depthBuffer: false
+      });
+      return renderTarget;
+    };
+    this.createTexture = function() {
+      const data = new Float32Array(sizeX * sizeY * 4);
+      const texture = new DataTexture(data, sizeX, sizeY, RGBAFormat, FloatType);
+      texture.needsUpdate = true;
+      return texture;
+    };
+    this.renderTexture = function(input, output) {
+      passThruUniforms.passThruTexture.value = input;
+      this.doRenderTarget(passThruShader, output);
+      passThruUniforms.passThruTexture.value = null;
+    };
+    this.doRenderTarget = function(material, output) {
+      const currentRenderTarget = renderer.getRenderTarget();
+      const currentXrEnabled = renderer.xr.enabled;
+      const currentShadowAutoUpdate = renderer.shadowMap.autoUpdate;
+      const currentOutputColorSpace = renderer.outputColorSpace;
+      const currentToneMapping = renderer.toneMapping;
+      renderer.xr.enabled = false;
+      renderer.shadowMap.autoUpdate = false;
+      if ("outputColorSpace" in renderer)
+        renderer.outputColorSpace = "srgb-linear";
+      else
+        renderer.encoding = 3e3;
+      renderer.toneMapping = NoToneMapping;
+      mesh.material = material;
+      renderer.setRenderTarget(output);
+      renderer.render(scene, camera);
+      mesh.material = passThruShader;
+      renderer.xr.enabled = currentXrEnabled;
+      renderer.shadowMap.autoUpdate = currentShadowAutoUpdate;
+      renderer.outputColorSpace = currentOutputColorSpace;
+      renderer.toneMapping = currentToneMapping;
+      renderer.setRenderTarget(currentRenderTarget);
+    };
+    function getPassThroughVertexShader() {
+      return "void main()	{\n\n	gl_Position = vec4( position, 1.0 );\n\n}\n";
+    }
+    function getPassThroughFragmentShader() {
+      return "uniform sampler2D passThruTexture;\n\nvoid main() {\n\n	vec2 uv = gl_FragCoord.xy / resolution.xy;\n\n	gl_FragColor = texture2D( passThruTexture, uv );\n\n}\n";
+    }
+  }
+}
+export {
+  GPUComputationRenderer
+};
+//# sourceMappingURL=GPUComputationRenderer.js.map