pub unsafe static SCNShaderModifierEntryPointFragment: &'static SCNShaderModifierEntryPointSCNShadable only.Expand description
This is the last entry point in the fragment shader, where you can alter the final color returned by the shader.
You can alter the final color by reading and writing to the output color via the output structure below.
Structures available from the SCNShaderModifierEntryPointFragment entry point:
| All the structures available from the SCNShaderModifierEntryPointSurface entry point | | Access: ReadOnly | Stages: Fragment shader only
| struct SCNFramebuffer { | float4 color; // Contents of the destination framebuffer corresponding to the fragment being processed | } _framebuffer; // Available since macOS 13, iOS 16, tvOS 16 and watchOS 9. | | Access: ReadOnly | Stages: Fragment shader only
| struct SCNShaderOutput { | float4 color; | } _output; | | Access: ReadWrite | Stages: Fragment shader only
Example: Inverse final color
GLSL | _output.color.rgb = vec3(1.0) - _output.color.rgb;
Metal Shading Language | _output.color.rgb = 1.0 - _output.color.rgb;
See also Apple’s documentation