| R1 | YampaSDL2.ReExports, YampaSDL2 |
| R2 | YampaSDL2.ReExports, YampaSDL2 |
| readColourName | Data.Colour.Names, YampaSDL2.ReExports, YampaSDL2 |
| rectangle | YampaSDL2.Drawable.Rectangle, YampaSDL2.Draw, YampaSDL2 |
| Red | |
| 1 (Type/Class) | Data.Colour.Internal |
| 2 (Data Constructor) | Data.Colour.Internal |
| red | Data.Colour.Names, YampaSDL2.ReExports, YampaSDL2 |
| render | YampaSDL2.InputOutput, YampaSDL2 |
| RenderObject | YampaSDL2.Internal.AppOutput, YampaSDL2.InputOutput, YampaSDL2 |
| RGB | |
| 1 (Data Constructor) | Data.Colour.Internal |
| 2 (Type/Class) | Data.Colour.RGB, Data.Colour.RGBSpace.HSL, Data.Colour.RGBSpace.HSV, Data.Colour.SRGB.Linear, Data.Colour.RGBSpace, Data.Colour.SRGB, YampaSDL2.ReExports, YampaSDL2 |
| 3 (Data Constructor) | Data.Colour.RGB, Data.Colour.SRGB.Linear, Data.Colour.RGBSpace, Data.Colour.SRGB, YampaSDL2.ReExports, YampaSDL2 |
| rgb | Data.Colour.SRGB.Linear |
| rgb2xyz | Data.Colour.RGB |
| RGBA | Data.Colour.Internal |
| rgbaAdd | Data.Colour.Internal |
| RGBGamut | |
| 1 (Type/Class) | Data.Colour.RGB, Data.Colour.RGBSpace |
| 2 (Data Constructor) | Data.Colour.RGB |
| RGBSpace | Data.Colour.RGBSpace |
| rgbUsingSpace | Data.Colour.RGBSpace |
| RO | YampaSDL2.Internal.AppOutput, YampaSDL2.InputOutput, YampaSDL2 |
| rosybrown | Data.Colour.Names, YampaSDL2.ReExports, YampaSDL2 |
| royalblue | Data.Colour.Names, YampaSDL2.ReExports, YampaSDL2 |