protected virtual void Create()
{
LogManager.Log(LogLevel.Debug, "Texture.Create()");
// Not needed on newer OpenGL
if (!GlHelper.HasExtension("GL_ARB_texture_non_power_of_two"))
{
if (!IsPowerOf2(width) || !IsPowerOf2(height))
{
throw new Exception("Texture size must be power of 2");
}
}
GlUtil.Assert("before creating texture");
CreateTexture();
try {
gl.BindTexture(gl.TEXTURE_2D, Handle);
gl.TexImage2D(gl.TEXTURE_2D, 0, (int)glformat,
(int)width, (int)height, 0,
gl.RGBA, gl.UNSIGNED_BYTE, IntPtr.Zero);
GlUtil.Assert("creating texture (too big?)");
SetTextureParams();
} catch (Exception) {
uint[] handles = { Handle };
gl.DeleteTextures(1, handles);
throw;
}
}
protected override void Create()
{
// Not needed on newer OpenGL
if (!GlHelper.HasExtension("GL_ARB_texture_non_power_of_two"))
{
if (!IsPowerOf2(width) || !IsPowerOf2(height))
{
throw new Exception("Texture size must be power of 2");
}
}
GlUtil.Assert("before creating texture");
CreateTexture();
try {
gl.BindTexture(gl.TEXTURE_2D, Handle);
gl.TexImage2D(gl.TEXTURE_2D, 0, (int)gl.RGBA,
(int)width, (int)height, 0, (pixbuf.HasAlpha ? gl.RGBA : gl.RGB),
gl.UNSIGNED_BYTE, pixbuf.Pixels);
GlUtil.Assert("creating texture (too big?)");
SetTextureParams();
this.pixbuf = null; //gc can take it now
} catch (Exception) {
uint[] handles = { Handle };
gl.DeleteTextures(1, handles);
throw;
}
}
protected void CreateEmpty(uint width, uint height, uint glformat)
{
if (!IsPowerOf2(width) || !IsPowerOf2(height))
{
throw new Exception("Texture size must be power of 2");
}
this.width = width;
this.height = height;
GlUtil.Assert("before creating texture");
CreateTexture();
try {
gl.BindTexture(gl.TEXTURE_2D, handle);
gl.TexImage2D(gl.TEXTURE_2D, 0, (int)glformat,
(int)width, (int)height, 0,
gl.RGBA, gl.UNSIGNED_BYTE, IntPtr.Zero);
GlUtil.Assert("creating texture (too big?)");
SetTextureParams();
} catch (Exception) {
uint[] handles = { handle };
gl.DeleteTextures(1, handles);
throw;
}
}
protected unsafe void CreateFromSurface(IntPtr surfacep, uint glformat)
{
Sdl.Surface *surface = (Sdl.Surface *)surfacep;
this.width = (uint)surface->w;
this.height = (uint)surface->h;
if (!IsPowerOf2(width) || !IsPowerOf2(height))
{
throw new Exception("Texture size must be power of 2");
}
GlUtil.Assert("before creating texture");
CreateTexture();
try {
gl.BindTexture(gl.TEXTURE_2D, handle);
uint surface_format = SetupPixelFormat(surfacep);
gl.TexImage2D(gl.TEXTURE_2D, 0, (int)glformat,
(int)width, (int)height, 0, surface_format,
gl.UNSIGNED_BYTE, surface->pixels);
GlUtil.Assert("creating texture (too big?)");
SetTextureParams();
} catch (Exception) {
uint[] handles = { handle };
gl.DeleteTextures(1, handles);
throw;
}
}
public unsafe void copy_to(IntPtr surfacep, uint surface_x, uint surface_y,
uint texture_x, uint texture_y,
uint width, uint height)
{
Sdl.Surface *surface = (Sdl.Surface *)surfacep;
PixelFormat *format = (PixelFormat *)surface->format;
GlUtil.Assert("Before update texture");
uint surface_format = SetupPixelFormat(surfacep);
/* We're extracting sub rectangles from the SDL_Surface pixeldata, by
* setting the pitch to the real width, but telling OpenGL just our
* desired image dimensions.
*/
IntPtr pixeldata = (IntPtr)
(((byte *)surface->pixels) + surface_y * surface->pitch
+ format->BytesPerPixel * surface_x);
gl.TexSubImage2D(gl.TEXTURE_2D, 0, (int)texture_x, (int)texture_y,
(int)width, (int)height, surface_format,
gl.UNSIGNED_BYTE, pixeldata);
GlUtil.Assert("Updating Texture Part");
}
/// <summary>
/// Helper method: set common texture parameters.
/// </summary>
protected static void SetTextureParams()
{
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP);
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP);
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_R, gl.CLAMP);
GlUtil.Assert("setting texture parameters");
}
