mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 21:32:20 +02:00
86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
package opengl
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import (
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"github.com/go-gl/gl"
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"github.com/hajimehoshi/ebiten/graphics"
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"github.com/hajimehoshi/ebiten/graphics/opengl/internal/shader"
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"image"
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"image/draw"
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)
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func adjustImageForTexture(img image.Image) *image.NRGBA {
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width, height := img.Bounds().Size().X, img.Bounds().Size().Y
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adjustedImageBounds := image.Rectangle{
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image.ZP,
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image.Point{
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shader.AdjustSizeForTexture(width),
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shader.AdjustSizeForTexture(height),
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},
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}
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if nrgba, ok := img.(*image.NRGBA); ok && img.Bounds() == adjustedImageBounds {
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return nrgba
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}
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adjustedImage := image.NewNRGBA(adjustedImageBounds)
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dstBounds := image.Rectangle{
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image.ZP,
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img.Bounds().Size(),
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}
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draw.Draw(adjustedImage, dstBounds, img, image.ZP, draw.Src)
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return adjustedImage
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}
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type texture struct {
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native gl.Texture
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width int
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height int
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}
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func createNativeTexture(textureWidth, textureHeight int, pixels []uint8, filter graphics.Filter) gl.Texture {
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nativeTexture := gl.GenTexture()
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if nativeTexture < 0 {
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panic("glGenTexture failed")
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}
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gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
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nativeTexture.Bind(gl.TEXTURE_2D)
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defer gl.Texture(0).Bind(gl.TEXTURE_2D)
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glFilter := 0
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switch filter {
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case graphics.FilterLinear:
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glFilter = gl.LINEAR
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case graphics.FilterNearest:
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glFilter = gl.NEAREST
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default:
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panic("not reached")
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}
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, glFilter)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, glFilter)
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ptr := interface{}(nil)
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if pixels != nil {
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ptr = pixels
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}
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gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, textureWidth, textureHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, ptr)
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return nativeTexture
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}
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func createTexture(width, height int, filter graphics.Filter) (*texture, error) {
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w := shader.AdjustSizeForTexture(width)
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h := shader.AdjustSizeForTexture(height)
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native := createNativeTexture(w, h, nil, filter)
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return &texture{native, width, height}, nil
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}
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func createTextureFromImage(img image.Image, filter graphics.Filter) (*texture, error) {
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adjustedImage := adjustImageForTexture(img)
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size := adjustedImage.Bounds().Size()
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native := createNativeTexture(size.X, size.Y, adjustedImage.Pix, filter)
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return &texture{native, size.X, size.Y}, nil
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}
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func (t *texture) dispose() {
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t.native.Delete()
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}
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