glutil

package
Version: v0.0.0-...-8b1022e Latest Latest
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Published: Jun 17, 2016 License: Apache-2.0, BSD-3-Clause Imports: 10 Imported by: 0

Documentation

Overview

Package glutil implements OpenGL utility functions.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func CreateProgram

func CreateProgram(glctx gl.Context, vertexSrc, fragmentSrc string) (gl.Program, error)

CreateProgram creates, compiles, and links a gl.Program.

Types

type Image

type Image struct {
	RGBA *image.RGBA
	// contains filtered or unexported fields
}

Image bridges between an *image.RGBA and an OpenGL texture.

The contents of the *image.RGBA can be uploaded as a texture and drawn as a 2D quad.

The number of active Images must fit in the system's OpenGL texture limit. The typical use of an Image is as a texture atlas.

func (*Image) Draw

func (img *Image) Draw(sz size.Event, topLeft, topRight, bottomLeft geom.Point, srcBounds image.Rectangle)

Draw draws the srcBounds part of the image onto a parallelogram, defined by three of its corners, in the current GL framebuffer.

func (*Image) Release

func (img *Image) Release()

Release invalidates the Image and removes any underlying data structures. The Image cannot be used after being deleted.

func (*Image) Upload

func (img *Image) Upload()

Upload copies the host image data to the GL device.

type Images

type Images struct {
	// contains filtered or unexported fields
}

Images maintains the shared state used by a set of *Image objects.

func NewImages

func NewImages(glctx gl.Context) *Images

NewImages creates an *Images.

func (*Images) NewImage

func (p *Images) NewImage(w, h int) *Image

NewImage creates an Image of the given size.

Both a host-memory *image.RGBA and a GL texture are created.

func (*Images) Release

func (p *Images) Release()

Release releases any held OpenGL resources. All *Image objects must be released first, or this function panics.

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