wip, picking and flags

src/mol-app/ui/visualization/viewport.tsx

src/mol-geo/representation/structure/index.ts

src/mol-geo/representation/structure/point.ts

src/mol-geo/representation/structure/spacefill.ts

src/mol-geo/representation/structure/utils.ts

src/mol-geo/representation/volume/surface.ts

src/mol-geo/util/color-data.ts

src/mol-gl/_spec/renderer.spec.ts

src/mol-gl/renderable/schema.ts

src/mol-gl/renderable/util.ts

src/mol-gl/shader/chunks/color-assign-varying.glsl

src/mol-gl/shader/chunks/color-vert-params.glsl

src/mol-gl/shader/chunks/common-frag-params.glsl

src/mol-gl/shader/chunks/common-vert-params.glsl

src/mol-gl/shader/mesh.frag

src/mol-gl/shader/mesh.vert

src/mol-gl/shader/utils/read-from-texture.glsl

src/mol-gl/webgl/context.ts

src/mol-gl/webgl/texture.ts

src/mol-view/viewer.ts