98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
package pixelgl
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import "github.com/go-gl/gl/v3.3-core/gl"
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import "runtime"
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// Texture is an OpenGL texture.
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type Texture struct {
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parent Doer
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tex binder
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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, smooth bool, pixels []uint8) (*Texture, error) {
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texture := &Texture{
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parent: parent,
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tex: binder{
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restoreLoc: gl.TEXTURE_BINDING_2D,
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bindFunc: func(obj uint32) {
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gl.BindTexture(gl.TEXTURE_2D, obj)
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},
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},
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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.obj)
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defer texture.tex.bind().restore()
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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.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.MIRRORED_REPEAT)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.MIRRORED_REPEAT)
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if smooth {
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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} else {
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST_MIPMAP_NEAREST)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
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}
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gl.GenerateMipmap(gl.TEXTURE_2D)
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})
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})
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runtime.SetFinalizer(texture, (*Texture).delete)
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return texture, nil
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}
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func (t *Texture) delete() {
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DoNoBlock(func() {
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gl.DeleteTextures(1, &t.tex.obj)
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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.obj
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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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DoNoBlock(func() {
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t.tex.bind()
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})
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sub(ctx)
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DoNoBlock(func() {
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t.tex.restore()
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})
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})
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}
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