/// <summary>
/// Makes this panel's OpenGL context current</summary>
protected void SetCurrentContext()
{
if (!Wgl.wglMakeCurrent(m_hdc, m_hglrc))
{
Util3D.ReportErrors();
throw new InvalidOperationException("Can't make this panel's GL context to be current");
}
}
/// <summary>
/// Begins painting</summary>
/// <exception cref="InvalidOperationException">Can't make this panel's GL context to be current</exception>
protected virtual void BeginPaint()
{
StartGlIfNecessary();
if (!Wgl.wglMakeCurrent(m_hdc, m_hglrc))
{
Util3D.ReportErrors();
throw new InvalidOperationException("Can't make this panel's GL context to be current");
}
}
/// <summary>
/// Destroys all texture bindings for the given context</summary>
/// <param name="contextId">Context ID of textures to destroy</param>
public void DestroyTextures(object contextId)
{
TextureContext texCollection = FindContext(contextId);
if (texCollection != null)
{
if (texCollection.Names.Count > 0)
{
int[] texs = new int[texCollection.Names.Count];
texCollection.Names.CopyTo(texs, 0);
Gl.glDeleteTextures(texs.Length, texs);
Util3D.ReportErrors();
}
m_texCollections.Remove(texCollection);
}
}
/// <summary>
/// Initializes an OpenGL context with the associated Win32 device context</summary>
/// <param name="hdc">HDC from the window to which the new OpenGL context is bound</param>
/// <param name="hglrc">Handle to the new OpenGL context</param>
public static void InitOpenGl(IntPtr hdc, out IntPtr hglrc)
{
Gdi.PIXELFORMATDESCRIPTOR pfd = new Gdi.PIXELFORMATDESCRIPTOR();
PopulatePixelFormatDescriptor(ref pfd);
// Attempt To Find An Appropriate Pixel Format
int pixelFormat = Gdi.ChoosePixelFormat(hdc, ref pfd);
if (pixelFormat == 0)
{
throw new InvalidOperationException("Can't find a suitable PixelFormat");
}
// Attempt To Set The Pixel Format?
if (!Gdi.SetPixelFormat(hdc, pixelFormat, ref pfd))
{
throw new InvalidOperationException("Can't set the PixelFormat");
}
// Attempt To Get The Rendering Context
hglrc = Wgl.wglCreateContext(hdc);
if (hglrc == IntPtr.Zero)
{
throw new InvalidOperationException("Can't create GL rendering context");
}
if (s_sharedHglrc == IntPtr.Zero)
{
s_sharedHglrc = hglrc;
}
else
{
// We don't throw an exception on failure because the caller may be on another thread or is
// using a different pixel format.
Wgl.wglShareLists(s_sharedHglrc, hglrc);
}
if (!Wgl.wglMakeCurrent(hdc, hglrc))
{
throw new InvalidOperationException("Can't make the OpenGL rendering context to be the current context.");
}
// Load all extensions for mainline rendering
if (!s_initialized)
{
LoadAllExtensions();
s_initialized = true;
}
// Init fonts
Gdi.SelectObject(hdc, SystemFonts.DefaultFont.ToHfont());
foreach (IntSet.Range range in s_fontMap.Ranges)
{
int baseDisplayListId = range.PreviousItemsCount + TEXT_DISPLAY_LIST_BASE;
if (!wglUseFontBitmaps(hdc, range.Min, range.Count, (uint)baseDisplayListId))
{
throw new InvalidOperationException("Font bitmaps were unable to be created.");
}
}
s_fontMap.Lock();
Util3D.ReportErrors();
}
/// <summary>
/// Loads a compressed texture using a call to glCompressedTexImage2DARB() as CUBE_MAP</summary>
/// <param name="image">The Image</param>
/// <param name="levels">Mipmap levels</param>
private unsafe void CompressedTextureLoadPixelDataCUBEMAP(Image image, int levels)
{
IntPtr glCompressedTexImage2DARB =
Gl.GetFunctionPointerForExtensionMethod("glCompressedTexImage2DARB");
if (glCompressedTexImage2DARB == IntPtr.Zero)
{
return;
}
int nBlockSize;
if (image.OpenGlPixelFormat == Gl.GL_COMPRESSED_RGBA_S3TC_DXT1_EXT)
{
nBlockSize = 8;
}
else
{
nBlockSize = 16;
}
int offset = 0;
// Load the mip-map levels
for (int face = 0; face < 6; face++)
{
int nWidth = image.Width;
int nHeight = image.Height;
for (int i = 0; i < levels; ++i)
{
if (nWidth == 0)
{
nWidth = 1;
}
if (nHeight == 0)
{
nHeight = 1;
}
// nSize = ((nWidth + 3) / 4) * ((nHeight + 3) / 4) * nBlockSize;
int nSize = ((nWidth + 3) >> 2) * ((nHeight + 3) >> 2) * nBlockSize;
byte[] pixel = new byte[nSize];
for (int o = offset, j = 0; o < offset + nSize; o++, j++)
{
pixel[j] = image.Pixels[o];
}
Gl.glCompressedTexImage2DARB(
Gl.GL_TEXTURE_CUBE_MAP_POSITIVE_X + face,
i,
image.OpenGlPixelFormat,
nWidth,
nHeight,
0,
nSize,
pixel);
offset += nSize;
// Half the image size for the next mip-map level...
nWidth = (nWidth >> 1);
nHeight = (nHeight >> 1);
}
}
Util3D.ReportErrors();
}
private unsafe void CompressedTextureLoadPixelData(Image image, int levels)
{
IntPtr glCompressedTexImage2DARB =
Gl.GetFunctionPointerForExtensionMethod("glCompressedTexImage2DARB");
if (glCompressedTexImage2DARB == IntPtr.Zero)
{
return;
}
int nBlockSize;
if (image.OpenGlPixelFormat == Gl.GL_COMPRESSED_RGBA_S3TC_DXT1_EXT)
{
nBlockSize = 8;
}
else
{
nBlockSize = 16;
}
int nWidth = image.Width;
int nHeight = image.Height;
int nSize;
int nOffset = 0;
// Load the mip-map levels
fixed(byte *pixels = image.Pixels)
{
for (int i = 0; i < levels; ++i)
{
if (nWidth == 0)
{
nWidth = 1;
}
if (nHeight == 0)
{
nHeight = 1;
}
nSize = ((nWidth + 3) / 4) * ((nHeight + 3) / 4) * nBlockSize;
Gl.glCompressedTexImage2DARB(
Gl.GL_TEXTURE_2D,
i,
image.OpenGlPixelFormat,
nWidth,
nHeight,
0,
nSize,
new IntPtr(pixels + nOffset));
nOffset += nSize;
// Half the image size for the next mip-map level...
nWidth = (nWidth / 2);
nHeight = (nHeight / 2);
}
}
Util3D.ReportErrors();
}
private int TryCreateOpenGlTextureFromImage(Image image, TextureInfo textureInfo)
{
textureInfo.Format = image.OpenGlPixelFormat;
textureInfo.Width = image.Width;
textureInfo.Height = image.Height;
textureInfo.Components = image.ElementsPerPixel;
// Relax pixel data alignment restrictions down from 4 to 1
Gl.glPixelStorei(Gl.GL_UNPACK_ALIGNMENT, 1);
int textureName;
Gl.glGenTextures(1, out textureName);
if (image.IsCubeMap)
{
Gl.glEnable(Gl.GL_TEXTURE_CUBE_MAP);
Gl.glBindTexture(Gl.GL_TEXTURE_CUBE_MAP, textureName);
// Initialize bound texture state
Gl.glTexParameteri(Gl.GL_TEXTURE_CUBE_MAP, Gl.GL_TEXTURE_WRAP_R, Gl.GL_CLAMP_TO_EDGE);
Gl.glTexParameteri(Gl.GL_TEXTURE_CUBE_MAP, Gl.GL_TEXTURE_WRAP_S, Gl.GL_CLAMP_TO_EDGE);
Gl.glTexParameteri(Gl.GL_TEXTURE_CUBE_MAP, Gl.GL_TEXTURE_WRAP_T, Gl.GL_CLAMP_TO_EDGE);
Gl.glTexParameteri(Gl.GL_TEXTURE_CUBE_MAP, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR_MIPMAP_LINEAR);
Gl.glTexParameteri(Gl.GL_TEXTURE_CUBE_MAP, Gl.GL_TEXTURE_MAX_LEVEL, image.Levels - 1);
textureInfo.EnableFlipImage = false;
}
else
{
Gl.glBindTexture(Gl.GL_TEXTURE_2D, textureName);
// Initialize bound texture state
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_WRAP_S, Gl.GL_REPEAT);
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_WRAP_T, Gl.GL_REPEAT);
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_LINEAR);
}
// If EnableFlipImage, we want to flip the image up side down
if (textureInfo.EnableFlipImage)
{
int pixel_size = image.Pixels.Length;
byte[] new_pixels = new byte[pixel_size];
for (int i = 0; i < image.Height; i++)
{
int source_i_offset = (image.Height - i - 1) * image.Width * image.ElementsPerPixel;
int destin_i_offset = (i) * image.Width * image.ElementsPerPixel;
for (int j = 0; j < image.Width; j++)
{
int j_offset = j * image.ElementsPerPixel;
for (int k = 0; k < image.ElementsPerPixel; k++)
{
new_pixels[destin_i_offset + j_offset + k] = image.Pixels[source_i_offset + j_offset + k];
}
}
}
image.Pixels = new_pixels;
}
if ((image.PixelFormat == PixelFormat.DXT1) ||
(image.PixelFormat == PixelFormat.DXT3) ||
(image.PixelFormat == PixelFormat.DXT5))
{
int levels = image.Levels;
if ((levels > 1) && CompressedTextureContainsAllMipmaps(image))
{
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_NEAREST_MIPMAP_LINEAR);
}
else
{
levels = 1;
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_LINEAR);
}
if (image.IsCubeMap)
{
CompressedTextureLoadPixelDataCUBEMAP(image, image.Levels);
}
else
{
CompressedTextureLoadPixelData(image, levels);
}
}
else
{
Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_NEAREST_MIPMAP_LINEAR);
Glu.gluBuild2DMipmaps(
Gl.GL_TEXTURE_2D,
image.ElementsPerPixel,
image.Width,
image.Height,
image.OpenGlPixelFormat,
Gl.GL_UNSIGNED_BYTE,
image.Pixels);
}
Util3D.ReportErrors();
return(textureName);
}