triangle-state
GPU-accelerated rendering » GPU state

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Vocabulary
gpu.state

Class description
The triangle-state controls how triangles are rasterized.

•	The front-mode and back-mode slots determine how a front- or back-facing triangle is rendered. • triangle-points renders the vertices of triangles as if they were points. • triangle-lines renders lines across the edges of triangles. • triangle-fill, the default, fills the entire surface of triangles.
•	The antialias? slot contains a boolean value that decides whether the edges of triangles should be smoothed.

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

Definition

USING: kernel ;

IN: gpu.state

TUPLE: triangle-state
    {
        front-mode triangle-mode read-only initial:
        triangle-fill
    }
    { back-mode triangle-mode read-only initial: triangle-fill }
    { antialias? boolean read-only initial: f } ;

Methods

USING: accessors combinators gpu.state gpu.state.private kernel
opengl.gl ;

M: triangle-state set-gpu-state*
    {
        [
            GL_FRONT swap front-mode>> gl-triangle-mode
            glPolygonMode
        ]
        [
            GL_BACK swap back-mode>> gl-triangle-mode
            glPolygonMode
        ]
        [
            GL_POLYGON_SMOOTH swap antialias?>>
            [ glEnable ] [ glDisable ] if
        ]
    } cleave ;