glLogicOp - specify a logical pixel operation for rendering

glGet() with argument GL_LOGIC_OP_MODE.

       glIsEnabled() with argument GL_COLOR_LOGIC_OP.

voidglLogicOp(GLenumopcode);

       Copyright © 1991-2006 Silicon Graphics, Inc.
       Copyright © 2010-2014 Khronos Group

[FIXME: source]                                    11/18/2024                                      GLLOGICOP(3G)

glLogicOp specifies a logical operation that, when enabled, is applied between the incoming RGBA color
       and the RGBA color at the corresponding location in the frame buffer. To enable or disable the logical
       operation, call glEnable() and

       glDisable using the symbolic constant GL_COLOR_LOGIC_OP. The initial value is disabled.

       ┌──────────────────┬──────────────────────┐
       │  Opcode          │  ResultingOperation │
       ├──────────────────┼──────────────────────┤
       │ GL_CLEAR         │          0           │
       ├──────────────────┼──────────────────────┤
       │ GL_SET           │          1           │
       ├──────────────────┼──────────────────────┤
       │ GL_COPY          │          s           │
       ├──────────────────┼──────────────────────┤
       │ GL_COPY_INVERTED │          ~s          │
       ├──────────────────┼──────────────────────┤
       │ GL_NOOP          │          d           │
       ├──────────────────┼──────────────────────┤
       │ GL_INVERT        │          ~d          │
       ├──────────────────┼──────────────────────┤
       │ GL_AND           │        s & d         │
       ├──────────────────┼──────────────────────┤
       │ GL_NAND          │       ~(s & d)       │
       ├──────────────────┼──────────────────────┤
       │ GL_OR            │        s | d         │
       ├──────────────────┼──────────────────────┤
       │ GL_NOR           │       ~(s | d)       │
       ├──────────────────┼──────────────────────┤
       │ GL_XOR           │        s ^ d         │
       ├──────────────────┼──────────────────────┤
       │ GL_EQUIV         │       ~(s ^ d)       │
       ├──────────────────┼──────────────────────┤
       │ GL_AND_REVERSE   │        s & ~d        │
       ├──────────────────┼──────────────────────┤
       │ GL_AND_INVERTED  │        ~s & d        │
       ├──────────────────┼──────────────────────┤
       │ GL_OR_REVERSE    │        s | ~d        │
       ├──────────────────┼──────────────────────┤
       │ GL_OR_INVERTED   │        ~s | d        │
       └──────────────────┴──────────────────────┘

       opcode is a symbolic constant chosen from the list above. In the explanation of the logical operations, s
       represents the incoming color and d represents the color in the frame buffer. Standard C-language
       operators are used. As these bitwise operators suggest, the logical operation is applied independently to
       each bit pair of the source and destination colors.

GL_INVALID_ENUM is generated if opcode is not an accepted value.

       glLogicOp - specify a logical pixel operation for rendering

       When more than one RGBA color buffer is enabled for drawing, logical operations are performed separately
       for each enabled buffer, using for the destination value the contents of that buffer (see
       glDrawBuffer()).

       Logic operations have no effect on floating point draw buffers. However, if GL_COLOR_LOGIC_OP is enabled,
       blending is still disabled in this case.

opcode
           Specifies a symbolic constant that selects a logical operation. The following symbols are accepted:
           GL_CLEAR, GL_SET, GL_COPY, GL_COPY_INVERTED, GL_NOOP, GL_INVERT, GL_AND, GL_NAND, GL_OR, GL_NOR,
           GL_XOR, GL_EQUIV, GL_AND_REVERSE, GL_AND_INVERTED, GL_OR_REVERSE, and GL_OR_INVERTED. The initial
           value is GL_COPY.

glBlendFunc(), glDrawBuffer(), glEnable(), glStencilOp()

       ┌───────────┬───────────────────────────────────────────────────────────────────────┐
       │           │                OpenGLVersion                                         │
       ├───────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
       │ Function  │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
       │ /         │     │     │     │     │     │     │     │     │     │     │     │     │
       │ Feature   │     │     │     │     │     │     │     │     │     │     │     │     │
       │ Name      │     │     │     │     │     │     │     │     │     │     │     │     │
       ├───────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │ glLogicOp │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │
       └───────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘