* remove ability to set depth formula on MeshDepthMaterial.

* remove depth formulas

* WebGLProgram: Rewrote uniform name parser.

* Revised structured uniforms.

- Allowed arbitrary nesting
- Removed map iteration

* working on depth texture

* working on depth texture

* support depth texture in webgl1 and webgl2

* fix comments

* reset build to avoid diff noise

* add check for webgl2 context

* fix depth texture example

* animation for example

* add file

* add depthTexture to WebGLRenderTarget

* ensure depth format returns correct GL parmaeter

* use null for initial depthTexture value

* add some commented out code

* Implemented user-defined clipping planes.

* Renderer: Minor documentation update.

* Implements object-level clipping.

* Renderer: Minor cosmetic changes.

* Fixed lethal typo in normal shader.

* Let shadows respect .side of object's material.

* Fixed Plane.applyMatrix4.

- Scale denormalized but did not scale the position
- Projection is not supported (solved by documentation)
- Removed unnecessary copying to make up for the normalization
- Still arguably too heavy

* Added custom clipping example.

* Clipping: Fixed transition to disabled state.

* Improved custom clipping example.

- GUI dependency of volume visualization on Enabled state
- Larger radius for cylindrical global clipping area

* No .matrixAutoUpdate = false in clipping example.

* Let ShadowMap check renderer.localClippingEnabled.

* Added a simplified clipping example.

* Reintroduce MeshPhysicalMaterial

* Reintroduce MeshPhysicalMaterial

* Simplified conditionals

Fix #8358

Fix for geometry.maxInstancedCount == 0

WebGLRenderer: loadUniformsGeneric() back to if statements. Chrome seems to be continuously deoptimizing the function. Maybe helps with #8220.

add ability to have texel encodings (RGBE,RGBM,etc.) on envMap and emissiveMap that can contain unbounded intensities.

Refactored shadowmap code again. Android/Adreno doesn't fails to support bool and mat4 in structs...