ebiten/graphics/opengl/texture.go

156 lines
4.0 KiB
Go
Raw Normal View History

2013-07-01 15:25:41 +02:00
// 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.
2013-06-19 01:49:54 +02:00
package opengl
2013-06-15 10:07:14 +02:00
// #cgo LDFLAGS: -framework OpenGL
//
// #include <OpenGL/gl.h>
import "C"
import (
2013-07-12 18:36:01 +02:00
"github.com/hajimehoshi/go.ebiten/graphics"
2013-06-19 03:31:44 +02:00
"image"
2013-06-15 10:07:14 +02:00
"unsafe"
)
2013-06-22 19:42:13 +02:00
func clp2(x uint64) uint64 {
2013-06-15 10:07:14 +02:00
x -= 1
x |= (x >> 1)
x |= (x >> 2)
x |= (x >> 4)
x |= (x >> 8)
x |= (x >> 16)
x |= (x >> 32)
return x + 1
}
2013-07-06 21:39:56 +02:00
func adjustPixels(width, height int, pixels []uint8) []uint8 {
textureWidth := int(clp2(uint64(width)))
textureHeight := int(clp2(uint64(height)))
if width == textureWidth && height == textureHeight {
return pixels
}
newPixels := make([]uint8, textureWidth*textureHeight*4)
for j := 0; j < height; j++ {
copy(newPixels[textureWidth*4*j:],
pixels[width*4*j:width*4*j+width*4])
}
return newPixels
}
2013-06-15 10:07:14 +02:00
type Texture struct {
2013-06-19 16:51:41 +02:00
id C.GLuint
width int
height int
textureWidth int
2013-06-19 01:49:54 +02:00
textureHeight int
2013-07-12 19:04:19 +02:00
framebuffer C.GLuint
2013-07-12 18:36:01 +02:00
isVirtual bool
}
func (texture *Texture) ID() graphics.TextureID {
return graphics.TextureID(texture.id)
}
func (texture *Texture) Width() int {
return texture.width
}
func (texture *Texture) Height() int {
return texture.height
2013-06-15 10:07:14 +02:00
}
2013-06-19 03:31:44 +02:00
func createTexture(width, height int, pixels []uint8) *Texture {
2013-06-17 16:39:44 +02:00
if pixels != nil {
2013-07-06 21:39:56 +02:00
pixels = adjustPixels(width, height, pixels)
2013-06-15 10:07:14 +02:00
}
2013-07-06 21:39:56 +02:00
textureWidth := int(clp2(uint64(width)))
textureHeight := int(clp2(uint64(height)))
2013-06-15 10:07:14 +02:00
texture := &Texture{
2013-06-19 16:51:41 +02:00
id: 0,
width: width,
height: height,
textureWidth: textureWidth,
2013-06-19 01:49:54 +02:00
textureHeight: textureHeight,
2013-07-12 18:36:01 +02:00
isVirtual: false,
2013-06-15 10:07:14 +02:00
}
2013-06-19 03:31:44 +02:00
textureID := C.GLuint(0)
C.glGenTextures(1, (*C.GLuint)(&textureID))
2013-07-12 18:36:01 +02:00
if textureID < 0 {
2013-06-19 03:31:44 +02:00
panic("glGenTexture failed")
}
C.glPixelStorei(C.GL_UNPACK_ALIGNMENT, 4)
C.glBindTexture(C.GL_TEXTURE_2D, C.GLuint(textureID))
2013-06-19 16:51:41 +02:00
2013-06-19 03:31:44 +02:00
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)
2013-06-15 10:07:14 +02:00
2013-06-19 03:31:44 +02:00
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)
2013-06-15 10:07:14 +02:00
2013-06-19 03:31:44 +02:00
texture.id = textureID
2013-06-15 10:07:14 +02:00
return texture
}
2013-06-23 09:06:32 +02:00
type textureError string
func (err textureError) Error() string {
return "Texture Error: " + string(err)
}
2013-06-19 03:31:44 +02:00
func newTexture(width, height int) *Texture {
return createTexture(width, height, nil)
2013-06-19 01:49:54 +02:00
}
2013-06-23 09:06:32 +02:00
func newTextureFromImage(img image.Image) (*Texture, error) {
2013-06-19 03:31:44 +02:00
var pix []uint8
switch img.(type) {
case *image.RGBA:
pix = img.(*image.RGBA).Pix
case *image.NRGBA:
pix = img.(*image.NRGBA).Pix
default:
2013-06-23 09:06:32 +02:00
return nil, textureError("image format must be RGBA or NRGBA")
2013-06-19 03:31:44 +02:00
}
size := img.Bounds().Size()
2013-06-23 09:06:32 +02:00
return createTexture(size.X, size.Y, pix), nil
2013-06-15 10:07:14 +02:00
}
2013-07-12 18:36:01 +02:00
func newVirtualTexture(width, height int) *Texture {
return &Texture{
id: 0,
width: width,
height: height,
textureWidth: int(clp2(uint64(width))),
textureHeight: int(clp2(uint64(height))),
isVirtual: true,
}
}