mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
118 lines
3.2 KiB
Go
118 lines
3.2 KiB
Go
// Copyright 2013 Hajime Hoshi
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
// SOFTWARE.
|
|
|
|
package opengl
|
|
|
|
// #cgo LDFLAGS: -framework OpenGL
|
|
//
|
|
// #include <OpenGL/gl.h>
|
|
import "C"
|
|
import (
|
|
"image"
|
|
"unsafe"
|
|
)
|
|
|
|
func clp2(x uint64) uint64 {
|
|
x -= 1
|
|
x |= (x >> 1)
|
|
x |= (x >> 2)
|
|
x |= (x >> 4)
|
|
x |= (x >> 8)
|
|
x |= (x >> 16)
|
|
x |= (x >> 32)
|
|
return x + 1
|
|
}
|
|
|
|
type Texture struct {
|
|
id C.GLuint
|
|
width int
|
|
height int
|
|
textureWidth int
|
|
textureHeight int
|
|
}
|
|
|
|
func createTexture(width, height int, pixels []uint8) *Texture {
|
|
textureWidth := int(clp2(uint64(width)))
|
|
textureHeight := int(clp2(uint64(height)))
|
|
if pixels != nil {
|
|
if width != textureWidth {
|
|
panic("sorry, but width should be power of 2")
|
|
}
|
|
if height != textureHeight {
|
|
panic("sorry, but height should be power of 2")
|
|
}
|
|
}
|
|
texture := &Texture{
|
|
id: 0,
|
|
width: width,
|
|
height: height,
|
|
textureWidth: textureWidth,
|
|
textureHeight: textureHeight,
|
|
}
|
|
|
|
textureID := C.GLuint(0)
|
|
C.glGenTextures(1, (*C.GLuint)(&textureID))
|
|
if textureID == 0 {
|
|
panic("glGenTexture failed")
|
|
}
|
|
C.glPixelStorei(C.GL_UNPACK_ALIGNMENT, 4)
|
|
C.glBindTexture(C.GL_TEXTURE_2D, C.GLuint(textureID))
|
|
|
|
ptr := unsafe.Pointer(nil)
|
|
if pixels != nil {
|
|
ptr = unsafe.Pointer(&pixels[0])
|
|
}
|
|
C.glTexImage2D(C.GL_TEXTURE_2D, 0, C.GL_RGBA,
|
|
C.GLsizei(textureWidth), C.GLsizei(textureHeight),
|
|
0, C.GL_RGBA, C.GL_UNSIGNED_BYTE, ptr)
|
|
|
|
C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MAG_FILTER, C.GL_LINEAR)
|
|
C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MIN_FILTER, C.GL_LINEAR)
|
|
C.glBindTexture(C.GL_TEXTURE_2D, 0)
|
|
|
|
texture.id = textureID
|
|
|
|
return texture
|
|
}
|
|
|
|
type textureError string
|
|
|
|
func (err textureError) Error() string {
|
|
return "Texture Error: " + string(err)
|
|
}
|
|
|
|
func newTexture(width, height int) *Texture {
|
|
return createTexture(width, height, nil)
|
|
}
|
|
|
|
func newTextureFromImage(img image.Image) (*Texture, error) {
|
|
var pix []uint8
|
|
switch img.(type) {
|
|
case *image.RGBA:
|
|
pix = img.(*image.RGBA).Pix
|
|
case *image.NRGBA:
|
|
pix = img.(*image.NRGBA).Pix
|
|
default:
|
|
return nil, textureError("image format must be RGBA or NRGBA")
|
|
}
|
|
size := img.Bounds().Size()
|
|
return createTexture(size.X, size.Y, pix), nil
|
|
}
|