scissor-state
GPU-accelerated rendering » GPU state

Prev:	viewport-state
Next:	multisample-state

Vocabulary
gpu.state

Class description
The scissor-state allows rendering output to be clipped to a rectangular region of the framebuffer. If the rect slot is set to a rect value, fragments outside that rectangle will be discarded. If it is f, fragments are allowed anywhere on the framebuffer.

See also
<scissor-state>, get-scissor-state

Definition

USING: math.rectangles ;

IN: gpu.state

TUPLE: scissor-state
    { rect maybe{ rect } read-only initial: f } ;

Methods

USING: accessors gpu.state kernel opengl.gl sequences ;

M: scissor-state set-gpu-state*
    GL_SCISSOR_TEST swap rect>>
    [ [ loc>> first2 ] [ dim>> first2 ] bi glViewport glEnable ]
    [ glDisable ] if* ;