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Merge pull request #10250 from CesiumGS/model-experimental-clipping-p…
…lanes Add clipping planes to `ModelExperimental`
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125 changes: 125 additions & 0 deletions
125
Source/Scene/ModelExperimental/ModelClippingPlanesPipelineStage.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| import Cartesian2 from "../../Core/Cartesian2.js"; | ||
| import ClippingPlaneCollection from "../ClippingPlaneCollection.js"; | ||
| import combine from "../../Core/combine.js"; | ||
| import Color from "../../Core/Color.js"; | ||
| import ModelClippingPlanesStageFS from "../../Shaders/ModelExperimental/ModelClippingPlanesStageFS.js"; | ||
| import ShaderDestination from "../../Renderer/ShaderDestination.js"; | ||
|
|
||
| /** | ||
| * The model clipping planes stage is responsible for applying clipping planes to the model. | ||
| * | ||
| * @namespace ModelClippingPlanesPipelineStage | ||
| * | ||
| * @private | ||
| */ | ||
| const ModelClippingPlanesPipelineStage = {}; | ||
| ModelClippingPlanesPipelineStage.name = "ModelClippingPlanesPipelineStage"; // Helps with debugging | ||
|
|
||
| const textureResolutionScratch = new Cartesian2(); | ||
| /** | ||
| * Process a model. This modifies the following parts of the render resources: | ||
| * | ||
| * <ul> | ||
| * <li>adds a define to the fragment shader to indicate that the model has clipping planes</li> | ||
| * <li>adds the defines to the fragment shader for parameters related to clipping planes, such as the number of planes</li> | ||
| * <li>adds a function to the fragment shader to apply the clipping planes to the model's base color</li> | ||
| * <li>adds the uniforms for the fragment shader for the clipping plane texture and matrix</li> | ||
| *</ul> | ||
| * | ||
| * @param {ModelRenderResources} renderResources The render resources for this model. | ||
| * @param {ModelExperimental} model The model. | ||
| * @param {FrameState} frameState The frameState. | ||
| * | ||
| * @private | ||
| */ | ||
| ModelClippingPlanesPipelineStage.process = function ( | ||
| renderResources, | ||
| model, | ||
| frameState | ||
| ) { | ||
| const clippingPlanes = model.clippingPlanes; | ||
| const context = frameState.context; | ||
| const shaderBuilder = renderResources.shaderBuilder; | ||
|
|
||
| shaderBuilder.addDefine( | ||
| "HAS_CLIPPING_PLANES", | ||
| undefined, | ||
| ShaderDestination.FRAGMENT | ||
| ); | ||
|
|
||
| shaderBuilder.addDefine( | ||
| "CLIPPING_PLANES_LENGTH", | ||
| clippingPlanes.length, | ||
| ShaderDestination.FRAGMENT | ||
| ); | ||
|
|
||
| if (clippingPlanes.unionClippingRegions) { | ||
| shaderBuilder.addDefine( | ||
| "UNION_CLIPPING_REGIONS", | ||
| undefined, | ||
| ShaderDestination.FRAGMENT | ||
| ); | ||
| } | ||
|
|
||
| if (ClippingPlaneCollection.useFloatTexture(context)) { | ||
| shaderBuilder.addDefine( | ||
| "USE_CLIPPING_PLANES_FLOAT_TEXTURE", | ||
| undefined, | ||
| ShaderDestination.FRAGMENT | ||
| ); | ||
| } | ||
|
|
||
| const textureResolution = ClippingPlaneCollection.getTextureResolution( | ||
| clippingPlanes, | ||
| context, | ||
| textureResolutionScratch | ||
| ); | ||
|
|
||
| shaderBuilder.addDefine( | ||
| "CLIPPING_PLANES_TEXTURE_WIDTH", | ||
| textureResolution.x, | ||
| ShaderDestination.FRAGMENT | ||
| ); | ||
|
|
||
| shaderBuilder.addDefine( | ||
| "CLIPPING_PLANES_TEXTURE_HEIGHT", | ||
| textureResolution.y, | ||
| ShaderDestination.FRAGMENT | ||
| ); | ||
|
|
||
| shaderBuilder.addUniform( | ||
| "sampler2D", | ||
| "model_clippingPlanes", | ||
| ShaderDestination.FRAGMENT | ||
| ); | ||
| shaderBuilder.addUniform( | ||
| "vec4", | ||
| "model_clippingPlanesEdgeStyle", | ||
| ShaderDestination.FRAGMENT | ||
| ); | ||
| shaderBuilder.addUniform( | ||
| "mat4", | ||
| "model_clippingPlanesMatrix", | ||
| ShaderDestination.FRAGMENT | ||
| ); | ||
|
|
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| shaderBuilder.addFragmentLines([ModelClippingPlanesStageFS]); | ||
|
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| const uniformMap = { | ||
| model_clippingPlanes: function () { | ||
| return clippingPlanes.texture; | ||
| }, | ||
| model_clippingPlanesEdgeStyle: function () { | ||
| const style = Color.clone(clippingPlanes.edgeColor); | ||
| style.alpha = clippingPlanes.edgeWidth; | ||
| return style; | ||
| }, | ||
| model_clippingPlanesMatrix: function () { | ||
| return model._clippingPlanesMatrix; | ||
| }, | ||
| }; | ||
|
|
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| renderResources.uniformMap = combine(uniformMap, renderResources.uniformMap); | ||
| }; | ||
|
|
||
| export default ModelClippingPlanesPipelineStage; |
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