// newTexture will return a new generated texture will not data uploaded to it.
func newTexture(width, height int32, mipmaps bool) *Texture {
new_texture := &Texture{
textureId: gl.CreateTexture(),
Width: width,
Height: height,
wrap: Wrap{s: WRAP_CLAMP, t: WRAP_CLAMP},
filter: newFilter(),
mipmaps: mipmaps,
}
new_texture.SetFilter(FILTER_NEAREST, FILTER_NEAREST)
new_texture.SetWrap(WRAP_CLAMP, WRAP_CLAMP)
if new_texture.mipmaps {
new_texture.filter.mipmap = states.back().defaultMipmapFilter
new_texture.SetMipmapSharpness(states.back().defaultMipmapSharpness)
}
if new_texture.mipmaps {
// Auto-generate mipmaps every time the texture is modified, if glGenerateMipmap isn't supported.
setTexMipMap()
}
new_texture.generateVerticies()
return new_texture
}
// Set the 'default' texture (id 0) as a repeating white pixel. Otherwise,
// texture2D calls inside a shader would return black when drawing graphics
// primitives, which would create the need to use different "passthrough"
// shaders for untextured primitives vs images.
func createDefaultTexture() {
gl_state.defaultTexture = gl.CreateTexture()
bindTexture(gl_state.defaultTexture)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
pix := []byte{255, 255, 255, 255}
gl.TexImage2D(gl.TEXTURE_2D, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(pix))
}