Mutable Materials

[bjornbytes]

Adds the following:

• Add getters and setters to Material, so properties can be changed after they're created:
  • Material:get/setColor
  • Material:get/setGlow
  • Material:get/setQuad
  • Material:get/setMetalness
  • Material:get/setRoughness
  • Material:get/setClearcoat
  • Material:get/setClearcoatRoughness
  • Material:get/setOcclusionStrength
  • Material:get/setNormalScale
  • Material:get/setAlphaCutoff
  • Material:is/setDoubleSided
  • Material:get/setTexture
  • (Note that Material can still only have 1 value for each property, so you can't do a draw with the material, change something, do a second draw, and expect the draws to use different values. Both draws will use the final value, whatever it was at submit time).
• Add doubleSided material property.
  • Double sided materials will always be drawn with culling disabled.
  • So you can keep culling enabled but draw a few double-sided objects like trees/leaves.
  • It gets imported from glTF models.
• Add Model:setMaterial to replace the material in one of the Model's material slots.
  • Note that you can set materials to nil, and they'll use whatever is set with Pass:setMaterial.
  • newModel(..., { materials = false }) now sets all of the material slots to nil instead of removing material slots completely (shouldn't really have any behavior change, just a cleaner design).
  • Note that you can't add/remove/reassign material slots.
• lovr.graphics.newMaterial can take a Texture or an Image to use for the color texture.