90 lines
1.7 KiB
Go
90 lines
1.7 KiB
Go
package pixelgl
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import "github.com/go-gl/gl/v3.3-core/gl"
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// Texture is an OpenGL texture.
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type Texture struct {
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enabled bool
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parent Doer
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tex uint32
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width, height int
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}
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// NewTexture creates a new texture with the specified width and height.
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// The pixels must be a sequence of RGBA values.
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func NewTexture(parent Doer, width, height int, pixels []uint8) (*Texture, error) {
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texture := &Texture{
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parent: parent,
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width: width,
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height: height,
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}
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parent.Do(func(ctx Context) {
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Do(func() {
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gl.GenTextures(1, &texture.tex)
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gl.BindTexture(gl.TEXTURE_2D, texture.tex)
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gl.TexImage2D(
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gl.TEXTURE_2D,
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0,
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gl.RGBA,
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int32(width),
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int32(height),
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0,
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gl.RGBA,
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gl.UNSIGNED_BYTE,
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gl.Ptr(pixels),
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)
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gl.GenerateMipmap(gl.TEXTURE_2D)
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gl.BindTexture(gl.TEXTURE_2D, 0)
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})
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})
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return texture, nil
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}
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// Delete deletes a texture. Don't use a texture after deletion.
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func (t *Texture) Delete() {
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t.parent.Do(func(ctx Context) {
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DoNoBlock(func() {
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gl.DeleteTextures(1, &t.tex)
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})
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})
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}
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// ID returns an OpenGL identifier of a texture.
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func (t *Texture) ID() uint32 {
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return t.tex
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}
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// Width returns the width of a texture in pixels.
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func (t *Texture) Width() int {
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return t.width
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}
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// Height returns the height of a texture in pixels.
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func (t *Texture) Height() int {
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return t.height
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}
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// Do bind a texture, executes sub, and unbinds the texture.
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func (t *Texture) Do(sub func(Context)) {
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t.parent.Do(func(ctx Context) {
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if t.enabled {
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sub(ctx)
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return
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}
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DoNoBlock(func() {
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gl.BindTexture(gl.TEXTURE_2D, t.tex)
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})
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t.enabled = true
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sub(ctx)
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t.enabled = false
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DoNoBlock(func() {
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gl.BindTexture(gl.TEXTURE_2D, 0)
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})
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})
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}
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