mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 21:32:20 +02:00
79 lines
1.8 KiB
Go
79 lines
1.8 KiB
Go
package opengl
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// #cgo LDFLAGS: -framework OpenGL
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//
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// #include <OpenGL/gl.h>
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import "C"
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import (
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"github.com/hajimehoshi/go-ebiten/graphics"
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"image"
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"unsafe"
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)
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type Texture struct {
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native C.GLuint
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width int
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height int
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}
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func createNativeTexture(
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textureWidth, textureHeight int,
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pixels []uint8,
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filter graphics.Filter) C.GLuint {
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nativeTexture := C.GLuint(0)
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C.glGenTextures(1, &nativeTexture)
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if nativeTexture < 0 {
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panic("glGenTexture failed")
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}
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C.glPixelStorei(C.GL_UNPACK_ALIGNMENT, 4)
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C.glBindTexture(C.GL_TEXTURE_2D, C.GLuint(nativeTexture))
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defer C.glBindTexture(C.GL_TEXTURE_2D, 0)
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glFilter := C.GLint(0)
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switch filter {
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case graphics.FilterLinear:
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glFilter = C.GL_LINEAR
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case graphics.FilterNearest:
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glFilter = C.GL_NEAREST
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default:
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panic("not reached")
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}
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C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MAG_FILTER, glFilter)
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C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MIN_FILTER, glFilter)
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ptr := unsafe.Pointer(nil)
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if pixels != nil {
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ptr = unsafe.Pointer(&pixels[0])
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}
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C.glTexImage2D(C.GL_TEXTURE_2D, 0, C.GL_RGBA,
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C.GLsizei(textureWidth), C.GLsizei(textureHeight),
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0, C.GL_RGBA, C.GL_UNSIGNED_BYTE, ptr)
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return nativeTexture
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}
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func createTexture(
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width, height int,
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filter graphics.Filter) (*Texture, error) {
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native := createNativeTexture(
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graphics.AdjustSizeForTexture(width),
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graphics.AdjustSizeForTexture(height),
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nil,
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filter)
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return &Texture{native, width, height}, nil
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}
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func createTextureFromImage(
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img image.Image,
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filter graphics.Filter) (*Texture, error) {
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adjustedImage := graphics.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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C.glDeleteTextures(1, &t.native)
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}
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