internal static Texture2D CreateFromFile(string filename, bool generateMipmaps = false)
{
using (TracedStopwatch.Start("Loading Texture: " + filename))
{
IntPtr intPtr = SDL2.SDL_image.IMG_Load(filename);
var surface = Marshal.PtrToStructure <SDL.SDL_Surface>(intPtr);
var pixelFormat = Marshal.PtrToStructure <SDL.SDL_PixelFormat>(surface.format);
var mode = OpenGL.PixelFormat.Rgba;
if (pixelFormat.BytesPerPixel == 3)
{
mode = OpenGL.PixelFormat.Rgb;
}
if (pixelFormat.BytesPerPixel == 1)
{
mode = OpenGL.PixelFormat.Red;
}
var rv = new Texture2D();
// TODO Pass in wraping styles
GlBindings.GenTextures(1, out rv.m_TextureId);
GlBindings.BindTexture(TextureType.GL_TEXTURE_2D, rv.m_TextureId);
GlBindings.TexParameteri(TextureType.GL_TEXTURE_2D, TextureAttribute.GL_TEXTURE_WRAP_S, TextureAttributeValue.GL_REPEAT);
GlBindings.TexParameteri(TextureType.GL_TEXTURE_2D, TextureAttribute.GL_TEXTURE_WRAP_T, TextureAttributeValue.GL_REPEAT);
GlBindings.TexParameteri(TextureType.GL_TEXTURE_2D, TextureAttribute.GL_TEXTURE_MIN_FILTER, TextureAttributeValue.GL_LINEAR);
GlBindings.TexParameteri(TextureType.GL_TEXTURE_2D, TextureAttribute.GL_TEXTURE_MAG_FILTER, TextureAttributeValue.GL_LINEAR);
var internalFormat = OpenGL.PixelInternalFormat.Rgba;
if (mode == PixelFormat.Luminance)
{
internalFormat = PixelInternalFormat.Red;
}
GlBindings.TexImage2D(TextureType.GL_TEXTURE_2D, 0, internalFormat, surface.w, surface.h, 0, mode, PixelType.UnsignedByte, surface.pixels);
if (generateMipmaps)
{
GlBindings.GenerateMipmap(TextureType.GL_TEXTURE_2D);
}
SDL2.SDL.SDL_free(intPtr);
return(rv);
}
}