func MakeRandomTexture(textureSlot int) (Texture, error) {
texture := NewTexture()
texture.Bind(textureSlot)
// gl.Enable(gl.TEXTURE_2D) // for some ATI drivers, for mipmap gen
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
Check()
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
Check()
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
Check()
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
Check()
var anisotropy float32
gl.GetFloatv(MaxTextureMaxAnisotropyExt, &anisotropy)
Check()
gl.TexParameterf(gl.TEXTURE_2D, TextureMaxAnisotropyExt, anisotropy)
Check()
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_BASE_LEVEL, 0)
Check()
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAX_LEVEL, 0)
Check()
var pix [3 * 700 * 700]byte
for i := 0; i < 3*700*700; i++ {
pix[i] = byte(128 + i/16)
}
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RGB,
700,
700,
0,
gl.RGB,
gl.UNSIGNED_BYTE,
gl.Ptr(&pix[0]))
Check()
return texture, nil
}
func (texture Texture) Load(textureSlot int, rgba *image.RGBA) {
texture.Bind(textureSlot)
// gl.Enable(gl.TEXTURE_2D) // for some ATI drivers, for mipmap gen
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
Check()
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
Check()
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
Check()
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
Check()
var anisotropy float32
gl.GetFloatv(MaxTextureMaxAnisotropyExt, &anisotropy)
Check()
gl.TexParameterf(gl.TEXTURE_2D, TextureMaxAnisotropyExt, anisotropy)
Check()
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_BASE_LEVEL, 0)
Check()
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAX_LEVEL, 0)
Check()
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA,
int32(rgba.Rect.Size().X),
int32(rgba.Rect.Size().Y),
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(rgba.Pix))
Check()
}