public static bool IsPrimitiveRestartSupported(GraphicsContext ctx)
{
if (ctx == null)
throw new ArgumentNullException("ctx");
return (ctx.Caps.GlExtensions.PrimitiveRestart || ctx.Caps.GlExtensions.PrimitiveRestart_NV);
}
/// <summary>
/// Draw the attributes of this vertex array.
/// </summary>
/// <param name="ctx">
/// The <see cref="GraphicsContext"/> used for rendering.
/// </param>
/// <param name="shader">
/// The <see cref="ShaderProgram"/> used for drawing the vertex arrays.
/// </param>
public virtual void Draw(GraphicsContext ctx, ShaderProgram shader)
{
CheckThisExistence(ctx);
if (shader != null && shader.Exists(ctx) == false)
throw new ArgumentException("not existing", "shader");
// If vertex was modified after creation, don't miss to create array buffers
if (_VertexArrayDirty) CreateObject(ctx);
// Set vertex arrays
SetVertexArrayState(ctx, shader);
// Fixed or programmable pipeline?
if ((shader == null) && (ctx.Caps.GlExtensions.VertexShader_ARB == true))
ShaderProgram.Unbind(ctx);
else if (shader != null)
shader.Bind(ctx);
// Issue rendering using shader
foreach (Element attributeElement in DrawElements) {
if (_FeedbackBuffer != null)
_FeedbackBuffer.Begin(ctx, attributeElement.ElementsMode);
attributeElement.Draw(ctx);
if (_FeedbackBuffer != null)
_FeedbackBuffer.End(ctx);
}
}
/// <summary>
/// Upload Texture1D data from an Image instance, allocating it immediately using a GraphicsContext.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for uploading texture data.
/// </param>
/// <param name="image">
/// An <see cref="Image"/> holding the texture data.
/// </param>
/// <remarks>
///
/// </remarks>
public void Set(GraphicsContext ctx, Image image)
{
if (ctx == null)
throw new ArgumentNullException("ctx");
if (ctx.IsCurrent == false)
throw new ArgumentException("ctx.IsCurrent() == false");
if (image == null)
throw new ArgumentNullException("image");
if ((image.Width == 0) || (image.Height == 0))
throw new ArgumentException("image.Width == 0 || image.Height == 0");
if (image.Height != 1)
throw new ArgumentException("image.Height != 1");
// Reference pixel data
mTextureData = image;
// Derive texture pixel format from 'image' if it is not defined yet
if (PixelLayout != PixelLayout.None) {
// Check whether texture pixel format is compatible with the image pixel format
if (Pixel.IsSupportedSetDataFormat(image.PixelLayout, PixelLayout, ctx) == false)
throw new InvalidOperationException(String.Format("textel format {0} incompatible with data pixel format {1}", image.PixelLayout, PixelLayout));
} else {
// Check whether texture pixel format is compatible with the image pixel format
if (Pixel.IsSupportedDataFormat(image.PixelLayout, ctx) == false)
throw new InvalidOperationException(String.Format("not supported data pixel format {1}", image.PixelLayout));
PixelLayout = image.PixelLayout;
}
// Texture extents
mWidth = image.Width;
// Upload texture data
Set(ctx);
}
/// <summary>
/// Upload Texture1D data.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for uploading texture data.
/// </param>
private void Set(GraphicsContext ctx)
{
// Create texture if necessary
Create(ctx);
// Bind this Texture
Bind(ctx);
// Upload texture data
int internalFormat = Pixel.GetGlInternalFormat(PixelLayout, ctx);
PixelFormat format = Pixel.GetGlFormat(mTextureData.PixelLayout);
PixelType type = Pixel.GetPixelType(mTextureData.PixelLayout);
// Set pixel transfer
foreach (int alignment in new int[] { 8, 4, 2, 1 }) {
if (mTextureData.Stride % alignment == 0) {
Gl.PixelStore(PixelStoreParameter.UnpackAlignment, alignment);
break;
}
}
// Upload texture contents
Gl.TexImage1D(TextureTarget.Texture1d, 0, internalFormat, (int)Width, 0, format, type, mTextureData.ImageBuffer);
// Unbind this texture
Unbind(ctx);
// Data no more required
mTextureData = null;
}
/// <summary>
/// Set uniform state variable (any known object type).
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for operations.
/// </param>
/// <param name="uniformName">
/// A <see cref="String"/> that specify the variable name in the shader source.
/// </param>
/// <param name="value">
/// A <see cref="Object"/> holding the uniform variabile data.
/// </param>
/// <remarks>
/// </remarks>
/// <exception cref="ArgumentNullException">
/// This exception is thrown if the parameter <paramref name="ctx"/> is null.
/// </exception>
/// <exception cref="ArgumentNullException">
/// This exception is thrown if the parameter <paramref name="uniformName"/> is null.
/// </exception>
public void SetUniform(GraphicsContext ctx, string uniformName, object value)
{
if (ctx == null)
throw new ArgumentNullException("ctx");
if (value == null)
throw new ArgumentNullException("value");
MethodInfo setUniformMethod;
if (_SetUniformMethods.TryGetValue(value.GetType(), out setUniformMethod) == false) {
setUniformMethod = typeof(ShaderProgram).GetMethod("SetUniform", new Type[] { typeof(GraphicsContext), typeof(string), value.GetType() });
_SetUniformMethods[value.GetType()] = setUniformMethod;
}
if (setUniformMethod != null) {
// Avoid stack overflow
if (setUniformMethod.GetParameters()[2].ParameterType == typeof(object))
throw new NotSupportedException(value.GetType() + " is not supported");
try {
setUniformMethod.Invoke(this, new object[] { ctx, uniformName, value });
} catch (TargetInvocationException targetInvocationException) {
throw targetInvocationException.InnerException;
}
} else
throw new NotSupportedException(value.GetType() + " is not supported");
}
/// <summary>
/// Check whether one of the extention strings is supported.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> that specifies the current OpenGL version to test for extension support. In the case this
/// parameter is null, the test fallback to the current OpenGL version.
/// </param>
public bool IsSupported(GraphicsContext ctx, IDeviceContext deviceContext)
{
if (IsSupportedExtension(ctx, deviceContext, mExtensionString) == true)
return (true);
if (mExtensionAlternatives != null) {
foreach (string ext in mExtensionAlternatives)
if (IsSupportedExtension(ctx, deviceContext, ext) == true)
return (true);
}
return (false);
}
public static void DisablePrimitiveRestart(GraphicsContext ctx)
{
if (ctx == null)
throw new ArgumentNullException("ctx");
if (ctx.Caps.GlExtensions.PrimitiveRestart) {
// Enable primitive restart (server state)
Gl.Disable(EnableCap.PrimitiveRestart);
} else if (ctx.Caps.GlExtensions.PrimitiveRestart_NV) {
// Enable primitive restart (client state)
Gl.DisableClientState(EnableCap.PrimitiveRestartNv);
} else
throw new InvalidOperationException("primitive restart not supported");
}
public static void EnablePrimitiveRestart(GraphicsContext ctx, DrawElementsType elementType)
{
switch (elementType) {
case DrawElementsType.UnsignedInt:
EnablePrimitiveRestart(ctx, UInt32.MaxValue);
break;
case DrawElementsType.UnsignedShort:
EnablePrimitiveRestart(ctx, UInt16.MaxValue);
break;
case DrawElementsType.UnsignedByte:
EnablePrimitiveRestart(ctx, Byte.MaxValue);
break;
default:
throw new ArgumentException(String.Format("unknown element type {0}", elementType));
}
}
/// <summary>
/// Query OpenGL implementation extensions.
/// </summary>
/// <param name="ctx"></param>
/// <returns></returns>
public static GraphicsCapabilities Query(GraphicsContext ctx, IDeviceContext deviceContext)
{
GraphicsCapabilities graphicsCapabilities = new GraphicsCapabilities();
FieldInfo[] capsFields = typeof(GraphicsCapabilities).GetFields(BindingFlags.Public | BindingFlags.Instance);
#region Platform Extension Reload
// Since at this point there's a current OpenGL context, it's possible to use
// {glx|wgl}GetExtensionsString to retrieve platform specific extensions
switch (Environment.OSVersion.Platform) {
case PlatformID.Win32NT:
case PlatformID.Win32Windows:
case PlatformID.Win32S:
case PlatformID.WinCE:
Wgl.SyncDelegates();
break;
}
#endregion
// Only boolean fields are considered
FieldInfo[] extsFields = Array.FindAll<FieldInfo>(capsFields, delegate(FieldInfo info) {
return (info.FieldType == typeof(bool));
});
foreach (FieldInfo field in extsFields) {
Attribute[] graphicsExtensionAttributes = Attribute.GetCustomAttributes(field, typeof(GraphicsExtensionAttribute));
GraphicsExtensionDisabledAttribute graphicsExtensionDisabled = (GraphicsExtensionDisabledAttribute)Attribute.GetCustomAttribute(field, typeof(GraphicsExtensionDisabledAttribute));
bool implemented = false;
// Check whether at least one extension is implemented
implemented = Array.Exists(graphicsExtensionAttributes, delegate(Attribute item) {
return ((GraphicsExtensionAttribute)item).IsSupported(ctx, deviceContext);
});
// Check whether the required extensions are artifically disabled
if (graphicsExtensionDisabled != null)
implemented = false;
field.SetValue(graphicsCapabilities, implemented);
}
return (graphicsCapabilities);
}
public static void EnablePrimitiveRestart(GraphicsContext ctx, uint index)
{
if (ctx == null)
throw new ArgumentNullException("ctx");
if (ctx.IsCurrent)
throw new ArgumentException("not current", "ctx");
if (ctx.Caps.GlExtensions.PrimitiveRestart) {
// Enable primitive restart (server state)
Gl.Enable(EnableCap.PrimitiveRestart);
// Specify restart index
Gl.PrimitiveRestartIndex(index);
} else if(ctx.Caps.GlExtensions.PrimitiveRestart_NV) {
// Enable primitive restart (client state)
Gl.EnableClientState(EnableCap.PrimitiveRestartNv);
// Specify restart index
Gl.PrimitiveRestartIndexNV(index);
} else
throw new InvalidOperationException("primitive restart not supported");
}
/// <summary>
/// Query OpenGL implementation extensions.
/// </summary>
/// <param name="ctx"></param>
/// <returns></returns>
public static GraphicsCapabilities Query(GraphicsContext ctx, IDeviceContext deviceContext)
{
GraphicsCapabilities graphicsCapabilities = new GraphicsCapabilities();
KhronosApi.LogComment("Query OpenGL extensions.");
#region Platform Extension Reload
// Since at this point there's a current OpenGL context, it's possible to use
// {glx|wgl}GetExtensionsString to retrieve platform specific extensions
switch (Environment.OSVersion.Platform) {
case PlatformID.Win32NT:
case PlatformID.Win32Windows:
case PlatformID.Win32S:
case PlatformID.WinCE:
// Wgl.SyncDelegates();
break;
}
#endregion
// OpenGL extensions
graphicsCapabilities._GlExtensions.Query();
// Windows OpenGL extensions
WindowsDeviceContext windowsDeviceContext = deviceContext as WindowsDeviceContext;
if (windowsDeviceContext != null)
graphicsCapabilities._WglExtensions.Query(windowsDeviceContext);
// GLX OpenGL extensions
XServerDeviceContext xserverDeviceContext = deviceContext as XServerDeviceContext;
if (xserverDeviceContext != null)
graphicsCapabilities._GlxExtensions.Query(xserverDeviceContext);
// Query implementation limits
graphicsCapabilities._GraphicsLimits = GraphicsLimits.Query(graphicsCapabilities._GlExtensions);
return (graphicsCapabilities);
}
/// <summary>
/// Determine whether this object requires a name bound to a context or not.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for creating this object name.
/// </param>
/// <returns>
/// <para>
/// This implementation returns always false.
/// </para>
/// </returns>
protected override bool RequiresName(GraphicsContext ctx)
{
return (false);
}
/// <summary>
/// Actually create this GraphicsResource resources.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for allocating resources.
/// </param>
protected override void CreateObject(GraphicsContext ctx)
{
int currentBinding;
Gl.Get(Gl.RENDERBUFFER_BINDING, out currentBinding);
Gl.BindRenderbuffer(Gl.RENDERBUFFER, ObjectName);
// Define buffer storage
Gl.RenderbufferStorage(Gl.RENDERBUFFER, Pixel.GetGlInternalFormat(_InternalFormat, ctx), (int)_Width, (int)_Height);
// Restore previous RenderBuffer binding
Gl.BindRenderbuffer(Gl.RENDERBUFFER, (uint)currentBinding);
}
/// <summary>
/// Determine whether this RenderBuffer really exists for a specific context.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> that would have created (or a sharing one) the object. This context shall be current to
/// the calling thread.
/// </param>
/// <returns>
/// It returns a boolean value indicating whether this RenderBuffer exists in the object space of <paramref name="ctx"/>.
/// </returns>
/// <remarks>
/// <para>
/// The object existence is done by checking a valid object by its name <see cref="IGraphicsResource.ObjectName"/>. This routine will test whether
/// <paramref name="ctx"/> has created this RenderBuffer (or is sharing with the creator).
/// </para>
/// </remarks>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="ctx"/> is null.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="ctx"/> is not current to the calling thread.
/// </exception>
public override bool Exists(GraphicsContext ctx)
{
if (ctx == null)
throw new ArgumentNullException("ctx");
if (ctx.IsCurrent == false)
throw new ArgumentException("not current", "ctx");
// Object name space test (and 'ctx' sanity checks)
if (base.Exists(ctx) == false)
return (false);
return (Gl.IsRenderbuffer(ObjectName));
}
protected override void CreateObject(GraphicsContext ctx)
{
// Base implementation
base.CreateObject(ctx);
if ((_PatchElement != null) && (_PatchElement.ArrayIndices != null))
_PatchElement.ArrayIndices.Create(ctx);
}
/// <summary>
/// Render this vertex array.
/// </summary>
/// <param name="ctx">
/// The <see cref="GraphicsContext"/> used for rendering.
/// </param>
/// <param name="shaderProgram">
/// The <see cref="ShaderProgram"/> used for drawing this vertex array.
/// </param>
public override void Draw(GraphicsContext ctx, ShaderProgram shaderProgram)
{
if (ctx == null)
throw new ArgumentNullException("ctx");
if (ctx.IsCurrent == false)
throw new ArgumentException("not current", "ctx");
if (shaderProgram == null)
throw new ArgumentNullException("shaderProgram");
if (shaderProgram.Exists(ctx) == false)
throw new ArgumentException("not existing", "shaderProgram");
if (Exists(ctx) == false)
throw new InvalidOperationException("not existing");
if (_Elements.Count == 0 && _PatchElement == null)
throw new InvalidOperationException("no elements defined");
if (_PatchElement != null) {
// Setup patch vertices
Gl.PatchParameter(Gl.PATCH_VERTICES, (int)_PatchElement.PatchCount);
// GL_PATCH_DEFAULT_OUTER_LEVEL | GL_PATCH_DEFAULT_INNER_LEVEL
// Set vertex arrays
SetVertexArrayState(ctx, shaderProgram);
// Uses shader
shaderProgram.Bind(ctx);
// Draw patches
_PatchElement.Draw(ctx);
}
// Based implementation
if (_Elements.Count > 0)
base.Draw(ctx, shaderProgram);
}
/// <summary>
/// Create Texture2d data, defining only the extents and the internal format.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for creating this Texture. If it null, the current context
/// will be used.
/// </param>
/// <param name="width">
/// A <see cref="UInt32"/> that specify the texture width.
/// </param>
/// <param name="format">
/// A <see cref="PixelLayout"/> determining the texture internal format.
/// </param>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="width"/> is zero.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="format"/> equals to <see cref="PixelFormat.None"/>.
/// </exception>
/// <exception cref="InvalidOperationException">
/// Exception thrown if <paramref name="ctx"/> is null and no context is current to the calling thread.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="width"/> is greater than the maximum allowed for 2D textures.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if NPOT texture are not supported by <paramref name="ctx"/> and <paramref name="width"/>
/// is not a power-of-two value.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="format"/> is not a supported internal format.
/// </exception>
public Texture1d(GraphicsContext ctx, uint width, PixelLayout format)
{
Create(ctx, width, format);
}
/// <summary>
/// Unbind this GraphicsSurface for drawing.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> to wich disassociate its rendering result from this GraphicsSurface.
/// </param>
public virtual void UnbindDraw(GraphicsContext ctx) { }
/// <summary>
/// Unbind this Texture.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for binding this Texture.
/// </param>
/// <remarks>
/// To call this routine the condition <i>IsCreated</i> shall be true.
/// </remarks>
public virtual void Unbind(GraphicsContext ctx)
{
Unbind(ctx, TextureTarget);
}
/// <summary>
/// Apply Texture parameters of specific target.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for setting texture parameter.
/// </param>
/// <param name="target">
/// A <see cref="TextureTarget"/> that specify the Texture target.
/// </param>
protected void ApplyParameters(GraphicsContext ctx, TextureTarget target)
{
int iParam;
#region Minification Filter
if (_HasMipMaps)
{
switch (MinFilter)
{
case Filter.Nearest:
switch (MipFilter)
{
case Filter.Nearest:
iParam = Gl.NEAREST_MIPMAP_NEAREST;
break;
case Filter.Linear:
iParam = Gl.NEAREST_MIPMAP_LINEAR;
break;
default:
throw new NotSupportedException(String.Format("unknown mipmap minification filter {0}", MipFilter));
}
break;
case Filter.Linear:
switch (MipFilter)
{
case Filter.Nearest:
iParam = Gl.LINEAR_MIPMAP_NEAREST;
break;
case Filter.Linear:
iParam = Gl.LINEAR_MIPMAP_LINEAR;
break;
default:
throw new NotSupportedException(String.Format("unknown mipmap minification filter {0}", MipFilter));
}
break;
default:
throw new NotSupportedException(String.Format("unknown minification filter {0}", MinFilter));
}
// Set minification filter (with mipmaps)
Gl.TexParameter(target, TextureParameterName.TextureMinFilter, iParam);
}
else
{
switch (MinFilter)
{
case Filter.Nearest:
iParam = Gl.NEAREST;
break;
case Filter.Linear:
iParam = Gl.LINEAR;
break;
default:
throw new NotSupportedException(String.Format("unknown minification filter {0}", MinFilter));
}
// Set minification filter (without mipmaps)
Gl.TexParameter(target, TextureParameterName.TextureMinFilter, iParam);
}
#endregion
#region Magnification Filter
switch (MagFilter)
{
case Filter.Nearest:
iParam = Gl.NEAREST;
break;
case Filter.Linear:
iParam = Gl.LINEAR;
break;
default:
throw new NotSupportedException(String.Format("unknown magnification filter {0}", MagFilter));
}
// Set minification filter (without mipmaps)
Gl.TexParameter(target, TextureParameterName.TextureMagFilter, iParam);
#endregion
#region Wrapping
if (target != TextureTarget.TextureRectangle)
{
// Wrap S coordinate
Gl.TexParameter(target, TextureParameterName.TextureWrapS, (int)WrapCoordS);
// Wrap T coordinate
Gl.TexParameter(target, TextureParameterName.TextureWrapT, (int)WrapCoordT);
// Wrap R coordinate
Gl.TexParameter(target, TextureParameterName.TextureWrapR, (int)WrapCoordR);
}
#endregion
#region Textel Components Swizzle
if ((_TextelSwizzleRGBA != null) && (ctx.Caps.GlExtensions.TextureSwizzle_ARB))
{
// Set components swizzle setup
Gl.TexParameter(target, (TextureParameterName)Gl.TEXTURE_SWIZZLE_RGBA, _TextelSwizzleRGBA);
}
#endregion
}
/// <summary>
/// Apply this Texture parameters.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for setting texture parameter.
/// </param>
/// <remarks>
/// Tipically this routine is implemented by simply calling the routine
/// <see cref="ApplyParameters(GraphicsContext,int)"/>.
/// </remarks>
public virtual void ApplyParameters(GraphicsContext ctx)
{
ApplyParameters(ctx, TextureTarget);
}
/// <summary>
/// Generate mipmaps for this Texture.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for generating texture mipmaps.
/// </param>
internal virtual void GenerateMipmaps(GraphicsContext ctx)
{
GenerateMipmaps(ctx, TextureTarget);
}
/// <summary>
/// Delete a Texture name.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for deleting this object name.
/// </param>
/// <param name="name">
/// A <see cref="UInt32"/> that specify the object name to delete.
/// </param>
protected override void DeleteName(GraphicsContext ctx, uint name)
{
// Delete texture name
Gl.DeleteTextures(name);
}
/// <summary>
/// Create a Texture name.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for creating this object name.
/// </param>
/// <returns>
/// It returns a valid object name for this Texture.
/// </returns>
protected override uint CreateName(GraphicsContext ctx)
{
// Generate texture name
return(Gl.GenTexture());
}
/// <summary>
/// Render on this UserControl.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for rendering this UserControl.
/// </param>
protected virtual void RenderThis(GraphicsContext ctx)
{
}
/// <summary>
/// Delete this GraphicsResource.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for deleting this object. The IGraphicsResource shall belong to the object space to this
/// <see cref="GraphicsContext"/>. The <see cref="GraphicsContext"/> shall be current to the calling thread.
/// </param>
/// <remarks>
/// <para>
/// After this method, the resource must have deallocated every graphic resource associated with it. Normally it should be possible
/// to create again the resources by calling <see cref="Create"/>.
/// </para>
/// <para>
/// This methods shall be the preferred way to deallocate graphic resources.
/// </para>
/// <para>
/// After a successfull call to Create, <see cref="Exists"/> shall return true.
/// </para>
/// <para>
/// The actual implementation deletes the name (<see cref="DeleteName"/>) only if the implementation requires a context related name
/// (<see cref="RequiresName"/>). In the case derived classes requires more complex resource deletion pattern, this method could
/// be overriden for that purpose, paying attention to call the base implementation.
/// </para>
/// </remarks>
/// <seealso cref="Create"/>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="ctx"/> is null.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="ctx"/> is not current to the calling thread.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if this object doesn't exists for <paramref name="ctx"/> (this is determined by calling <see cref="Exists"/>
/// method), or this resource has a name and <paramref name="ctx"/> is not current to the calling thread.
/// </exception>
public override void Delete(GraphicsContext ctx)
{
// Base implementation
base.Delete(ctx);
// Dispose shader includes
foreach (ShaderInclude shaderInclude in _IncludeFileSystem.Values)
shaderInclude.DecRef();
}
/// <summary>
/// Clear surface buffers.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for clearing buffers.
/// </param>
/// <param name="bufferMask">
/// A <see cref="GraphicsBuffersFormat.BufferType"/> indicating which buffers to clear.
/// </param>
public void Clear(GraphicsContext ctx, GraphicsBuffersFormat.BufferType bufferMask)
{
// Update clear values (only what is necessary)
if ((bufferMask & GraphicsBuffersFormat.BufferType.Color) != 0)
Gl.ClearColor(mClearColor.Red, mClearColor.Green, mClearColor.Blue, mClearColor.Alpha);
if ((bufferMask & GraphicsBuffersFormat.BufferType.Depth) != 0)
Gl.ClearDepth(mClearDepth);
if ((bufferMask & GraphicsBuffersFormat.BufferType.Stencil) != 0)
Gl.ClearStencil(mClearStencil);
// Clear
Gl.Clear(GetClearFlags(bufferMask));
}
/// <summary>
/// Bind this Texture on specific target.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for binding this Texture.
/// </param>
/// <param name="target">
/// A <see cref="TextureTarget"/> that specify the texture target.
/// </param>
protected void Bind(GraphicsContext ctx, TextureTarget target)
{
// Bind this Texture on specified target
Gl.BindTexture(target, ObjectName);
}
/// <summary>
/// Read this GraphicsSurface color buffer.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/>
/// </param>
/// <param name="rBuffer">
/// A <see cref="ReadBufferMode"/> that specify the read buffer where the colors are read from.
/// </param>
/// <param name="x">
/// A <see cref="Int32"/> that specify the x coordinate of the lower left corder of the rectangle area to read.
/// </param>
/// <param name="y">
/// A <see cref="Int32"/> that specify the y coordinate of the lower left corder of the rectangle area to read.
/// </param>
/// <param name="width">
/// A <see cref="Int32"/> that specify the width of the rectangle area to read.
/// </param>
/// <param name="height">
/// A <see cref="Int32"/> that specify the height of the rectangle area to read.
/// </param>
/// <param name="pType">
/// A <see cref="PixelLayout"/> which determine the pixel storage of the returned image.
/// </param>
/// <returns>
/// It returns an <see cref="Image"/> representing the current read buffer <paramref name="rBuffer"/>.
/// </returns>
protected Image ReadBuffer(GraphicsContext ctx, ReadBufferMode rBuffer, uint x, uint y, uint width, uint height, PixelLayout pType)
{
Image image = null;
if ((x + width > Width) || (y + height > Height))
throw new ArgumentException("specified region lies outside the GraphicsSurface");
// Bind for reading
BindRead(ctx);
// Set for reading
Gl.ReadBuffer(rBuffer);
// Allocate image holding data read
image = new Image();
image.Create(pType, width, height);
// Set pixel transfer
foreach (int alignment in new int[] { 8, 4, 2, 1 }) {
if (image.Stride % alignment == 0) {
Gl.PixelStore(PixelStoreParameter.PackAlignment, alignment);
break;
}
}
// Grab frame buffer pixels
PixelFormat rFormat = Pixel.GetGlFormat(pType);
PixelType rType = Pixel.GetPixelType(pType);
Gl.ReadPixels((int)x, (int)y, (int)width, (int)height, rFormat, rType, image.ImageBuffer);
// Unbind from reading
UnbindRead(ctx);
return (image);
}
/// <summary>
/// Unbind this Texture on specific target.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for binding this Texture.
/// </param>
/// <param name="target">
/// A <see cref="TextureTarget"/> that specify the texture target.
/// </param>
protected void Unbind(GraphicsContext ctx, TextureTarget target)
{
// Unbind this Texture on specified target
Gl.BindTexture(target, 0);
}
/// <summary>
/// Create a Texture name.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for creating this object name.
/// </param>
/// <returns>
/// It returns a valid object name for this Texture.
/// </returns>
protected override uint CreateName(GraphicsContext ctx)
{
// Generate texture name
return (Gl.GenTexture());
}
/// <summary>
/// Delete a ShaderProgram name.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for deleting this object name.
/// </param>
/// <param name="name">
/// A <see cref="UInt32"/> that specify the object name to delete.
/// </param>
protected override void DeleteName(GraphicsContext ctx, uint name)
{
// Delete program
Gl.DeleteProgram(name);
}
/// <summary>
/// Create a BufferObject name.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for creating this buffer object name.
/// </param>
/// <returns>
/// It returns a valid object name for this BufferObject.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="ctx"/> is null.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="ctx"/> is not current on the calling thread.
/// </exception>
protected override uint CreateName(GraphicsContext ctx)
{
if (ctx == null)
throw new ArgumentNullException("ctx");
// Here is the most appropriate point where to check patch support by current OpenGL implementation.
if (ctx.Caps.GlExtensions.TessellationShader_ARB == false)
throw new NotSupportedException("GL_ARB_tesselation_shader_ARB not supported by current implementation");
// Base implementation
return (base.CreateName(ctx));
}
/// <summary>
/// Create a ShaderProgram name.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for creating this object name.
/// </param>
/// <returns>
/// It returns a valid object name for this ShaderProgram.
/// </returns>
protected override uint CreateName(GraphicsContext ctx)
{
// Create program
return(Gl.CreateProgram());
}
/// <summary>
/// Allocate this RenderBuffer.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for allocation.
/// </param>
/// <param name="w">
/// A <see cref="Int32"/> that specify the width of the renderbuffer.
/// </param>
/// <param name="h">
/// A <see cref="Int32"/> that specify the height of the renderbuffer.
/// </param>
public void Allocate(GraphicsContext ctx, uint w, uint h)
{
// Allocate buffer
Gl.BindRenderbuffer(Gl.RENDERBUFFER, ObjectName);
// Define buffer storage
Gl.RenderbufferStorage(Gl.RENDERBUFFER, Pixel.GetGlInternalFormat(_InternalFormat, ctx), (int)w, (int)h);
}
/// <summary> /// Draw the elements instances /// </summary> /// <param name="ctx"> /// The <see cref="GraphicsContext"/> used for drawing. /// </param> /// <param name="instances"> /// A <see cref="UInt32"/> that specify the number of instances to draw. /// </param> public abstract void DrawInstanced(GraphicsContext ctx, uint instances);
/// <summary>
/// Create a RenderBuffer name.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for creating this object name.
/// </param>
/// <returns>
/// It returns a valid object name for this RenderBuffer.
/// </returns>
protected override uint CreateName(GraphicsContext ctx)
{
return (Gl.GenRenderbuffer());
}
public void End(GraphicsContext ctx)
{
Gl.EndQuery((int)mTarget);
}
/// <summary>
/// Delete a RenderBuffer name.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for deleting this object name.
/// </param>
/// <param name="name">
/// A <see cref="UInt32"/> that specify the object name to delete.
/// </param>
protected override void DeleteName(GraphicsContext ctx, uint name)
{
// Delete this render buffer
Gl.DeleteRenderbuffers(name);
}
/// <summary> /// Draw the elements. /// </summary> /// <param name="ctx"> /// The <see cref="GraphicsContext"/> used for drawing. /// </param> public abstract void Draw(GraphicsContext ctx);
/// <summary>
/// Actually create this GraphicsResource resources.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for allocating resources.
/// </param>
protected override void CreateObject(GraphicsContext ctx)
{
foreach (ShaderInclude shaderInclude in _IncludeFileSystem.Values)
shaderInclude.Create(ctx);
}
/// <summary>
/// Ensure that all required resources are created.
/// </summary>
/// <param name="ctx">
/// The <see cref="GraphicsContext"/> used for allocating resources.
/// </param>
public virtual void Create(GraphicsContext ctx)
{
}
/// <summary>
/// Clear all Surface buffers.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for clearing buffers.
/// </param>
public void Clear(GraphicsContext ctx)
{
Clear(ctx, BufferFormat.BuffersMask);
}
/// <summary>
/// Draw the elements instances
/// </summary>
/// <param name="ctx">
/// The <see cref="GraphicsContext"/> used for drawing.
/// </param>
/// <param name="instances">
/// A <see cref="UInt32"/> that specify the number of instances to draw.
/// </param>
public override void DrawInstanced(GraphicsContext ctx, uint instances)
{
throw new NotSupportedException();
}
/// <summary>
/// Check whether sRGB color correction on this GraphicsSurface is enabled.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/>.
/// </param>
/// <param name="surfaceFormat">
///
/// </param>
/// <returns>
/// Is returns a boolean value indicating whether sRGB color correction on this GraphicsSurface is enabled.
/// </returns>
protected bool IsEnabledSRGB(GraphicsContext ctx, GraphicsBuffersFormat surfaceFormat)
{
if (surfaceFormat.HasBuffer(GraphicsBuffersFormat.BufferType.ColorSRGB) == false)
throw new InvalidOperationException("surface has no sRGB buffer");
if ((ctx.Caps.GlExtensions.FramebufferSRGB_ARB == false) && (ctx.Caps.GlExtensions.FramebufferSRGB_EXT == false))
throw new InvalidOperationException("no framebuffer sRGB extension supported");
return (Gl.IsEnabled(EnableCap.FramebufferSrgb));
}
/// <summary>
/// Draw the elements instances
/// </summary>
/// <param name="ctx">
/// The <see cref="GraphicsContext"/> used for drawing.
/// </param>
/// <param name="instances">
/// A <see cref="UInt32"/> that specify the number of instances to draw.
/// </param>
public override void DrawInstanced(GraphicsContext ctx, uint instances)
{
uint count = ElementCount != 0 ? ElementCount : _VertexArrayObject.ArrayLength;
Gl.DrawArraysInstanced(ElementsMode, (int)ElementOffset, (int)count, (int)instances);
}
/// <summary>
/// Unbind this GraphicsSurface for reading.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> to wich disassociate its read result from this GraphicsSurface.
/// </param>
public virtual void UnbindRead(GraphicsContext ctx) { }
/// <summary>
/// Draw the elements.
/// </summary>
/// <param name="ctx">
/// The <see cref="GraphicsContext"/> used for drawing.
/// </param>
public override void Draw(GraphicsContext ctx)
{
uint count = ElementCount != 0 ? ElementCount : _VertexArrayObject.ArrayLength;
Gl.DrawArrays(ElementsMode, (int)ElementOffset, (int)count);
}
/// <summary>
/// Copy this GraphicsSurface color buffer into a buffer.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> which is bound to this GraphicsSurface.
/// </param>
/// <param name="rBuffer">
/// A <see cref="ReadBufferMode"/> that specify the read buffer where the colors are read from.
/// </param>
/// <param name="x">
/// A <see cref="Int32"/> that specify the x coordinate of the lower left corder of the rectangle area to read.
/// </param>
/// <param name="y">
/// A <see cref="Int32"/> that specify the y coordinate of the lower left corder of the rectangle area to read.
/// </param>
/// <param name="texture">
/// A <see cref="Texture"/> that will hold the buffer data.
/// </param>
/// <param name="level">
/// The level of the texture <paramref name="texture"/> to be written.
/// </param>
/// <returns>
/// It returns an <see cref="Image"/> representing the current read buffer <paramref name="rBuffer"/>.
/// </returns>
protected void CopyBuffer(GraphicsContext ctx, ReadBufferMode rBuffer, uint x, uint y, ref Texture texture, uint level)
{
if (texture == null)
throw new ArgumentNullException("texture");
if (texture.Exists(ctx) == false)
throw new ArgumentException("not exists", "texture");
if ((x + texture.Width > Width) || (y + texture.Height > Height))
throw new ArgumentException("specified region lies outside the GraphicsSurface");
// Bind for reading
BindRead(ctx);
// Set for reading
Gl.ReadBuffer(rBuffer);
// Copy pixels from read buffer to texture
Gl.CopyTexImage2D(texture.TextureTarget, (int)level, Pixel.GetGlInternalFormat(texture.PixelLayout, ctx), (int)x, (int)y, (int)texture.Width, (int)texture.Height, 0);
// Unbind from reading
UnbindRead(ctx);
// Reset read configuration
Gl.ReadBuffer(Gl.NONE);
}
/// <summary>
/// Link this ShaderProgram.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for linking this ShaderProgram.
/// </param>
/// <param name="cctx">
/// A <see cref="ShaderCompilerContext"/> that specify additional compiler parameters.
/// </param>
/// <remarks>
/// <para>
/// Generate shader program source code, compile and link it. After a successfull
/// link, obtain every information about active uniform and input variables.
/// </para>
/// <para>
/// This routine generate the source code of each attached ShaderObject instance and
/// compile it. This step is performed only if really required (tendentially every
/// shader object is already compiled).
/// </para>
/// <para>
/// After having compiled every attached shader object, it's performed the linkage between
/// shader objects. After this process the ShaderProgram instance can be bound to issue
/// rendering commands.
/// </para>
/// </remarks>
/// <exception cref="InvalidOperationException">
/// Exception thrown in the case this ShaderProgram is already linked.
/// </exception>
/// <exception cref="ShaderException">
/// Exception throw in the case this ShaderProgram is not linkable.
/// </exception>
private void Link(GraphicsContext ctx, ShaderCompilerContext cctx)
{
CheckCurrentContext(ctx);
if (cctx == null)
{
throw new ArgumentNullException("cctx");
}
// Using a deep copy of the shader compiler context, since it will be modified by this ShaderProgram
// instance and the attached ShaderObject instances
cctx = new ShaderCompilerContext(cctx);
#region Compile and Attach Shader Objects
// Be sure to take every attached shader
uint[] shadersObject = null;
int shadersCount;
Gl.GetProgram(ObjectName, Gl.ATTACHED_SHADERS, out shadersCount);
if (shadersCount > 0)
{
shadersObject = new uint[shadersCount];
Gl.GetAttachedShaders(ObjectName, out shadersCount, shadersObject);
Debug.Assert(shadersCount == shadersObject.Length);
}
foreach (ShaderObject shaderObject in _ProgramObjects)
{
// Create shader object, if necessary
if (shaderObject.Exists(ctx) == false)
{
shaderObject.Create(ctx, cctx);
}
// Do not re-attach the same shader object
if ((shadersObject != null) && Array.Exists(shadersObject, delegate(uint item) { return(item == shaderObject.ObjectName); }))
{
continue;
}
// Attach shader object
Gl.AttachShader(ObjectName, shaderObject.ObjectName);
}
#endregion
#region Transform Feedback Definition
IntPtr[] feedbackVaryingsPtrs = null;
if ((_FeedbackVaryings != null) && (_FeedbackVaryings.Count > 0))
{
sLog.Debug("Feedback varyings ({0}):", cctx.FeedbackVaryingsFormat);
sLog.Indent();
foreach (string feedbackVarying in _FeedbackVaryings)
{
sLog.Debug("- {0}", feedbackVarying);
}
sLog.Unindent();
if (ctx.Caps.GlExtensions.TransformFeedback2_ARB || ctx.Caps.GlExtensions.TransformFeedback_EXT)
{
string[] feedbackVaryings = _FeedbackVaryings.ToArray();
// Bug in NVIDIA drivers? Not exactly, but the NVIDIA driver hold the 'feedbackVaryings' pointer until
// glLinkProgram is executed, causing linker errors like 'duplicate varying names are not allowed' or garbaging
// part of the returned strings via glGetTransformFeedbackVarying
feedbackVaryingsPtrs = feedbackVaryings.AllocHGlobal();
// Specify feedback varyings
Gl.TransformFeedbackVaryings(ObjectName, feedbackVaryingsPtrs, (int)cctx.FeedbackVaryingsFormat);
}
else if (ctx.Caps.GlExtensions.TransformFeedback2_NV)
{
// Nothing to do ATM
}
else
{
throw new InvalidOperationException("transform feedback not supported");
}
}
#endregion
#region Bind Fragment Locations
if (ctx.Caps.GlExtensions.GpuShader4_EXT)
{
// Setup fragment locations, where defined
foreach (KeyValuePair <string, int> pair in _FragLocations)
{
if (pair.Value >= 0)
{
Gl.BindFragDataLocation(ObjectName, (uint)pair.Value, pair.Key);
}
}
}
#endregion
#region Link Shader Program Objects
int lStatus;
sLog.Debug("Link shader program {0}", Identifier ?? "<Unnamed>");
// Link shader program
Gl.LinkProgram(ObjectName);
// Check for linking errors
Gl.GetProgram(ObjectName, Gl.LINK_STATUS, out lStatus);
// Release feedback varyings unmanaged memory
if (feedbackVaryingsPtrs != null)
{
feedbackVaryingsPtrs.FreeHGlobal();
}
if (lStatus != Gl.TRUE)
{
const int MaxInfoLength = 4096;
StringBuilder logInfo = new StringBuilder(MaxInfoLength);
int logLength;
// Obtain compilation log
Gl.GetProgramInfoLog(ObjectName, MaxInfoLength, out logLength, logInfo);
// Stop link process
StringBuilder sb = new StringBuilder(logInfo.Capacity);
string[] compilerLogLines = logInfo.ToString().Split(new char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries);
foreach (string logLine in compilerLogLines)
{
sb.AppendLine(" $ " + logLine);
}
sLog.Error("Shader program \"{0}\" linkage failed: {1}", Identifier ?? "<Unnamed>", sb.ToString());
throw new ShaderException("shader program is not valid. Linker output for {0}: {1}\n", Identifier ?? "<Unnamed>", sb.ToString());
}
// Set linked flag
_Linked = true;
#endregion
#region Collect Active Program Uniforms
int uniformBufferSize, attributeBufferSize;
int uniformCount;
// Get active uniforms count
Gl.GetProgram(ObjectName, Gl.ACTIVE_UNIFORMS, out uniformCount);
// Get uniforms maximum length for name
Gl.GetProgram(ObjectName, Gl.ACTIVE_UNIFORM_MAX_LENGTH, out uniformBufferSize);
// Clear uniform mapping
_UniformMap.Clear();
_DefaultBlockUniformSlots = 0;
// Collect uniform information
for (uint i = 0; i < (uint)uniformCount; i++)
{
int uniformNameLength, uniformSize, uniformType;
// Mono optimize StringBuilder capacity after P/Invoke... ensure enought room
StringBuilder uNameBuilder = new StringBuilder(uniformBufferSize + 2);
uNameBuilder.EnsureCapacity(uniformBufferSize);
// Obtain active uniform informations
Gl.GetActiveUniform(ObjectName, i, uniformBufferSize, out uniformNameLength, out uniformSize, out uniformType, uNameBuilder);
string uniformName = uNameBuilder.ToString();
// Obtain active uniform location
int uLocation = Gl.GetUniformLocation(ObjectName, uniformName);
UniformBinding uniformBinding = new UniformBinding(uniformName, i, uLocation, (ShaderUniformType)uniformType);
// Map active uniform
_UniformMap[uniformName] = uniformBinding;
// Keep track of used slot
_DefaultBlockUniformSlots += GetUniformSlotCount(uniformBinding.UniformType);
}
// Log uniform location mapping
List <string> uniformNames = new List <string>(_UniformMap.Keys);
// Make uniform list invariant respect the used driver (ease log comparation)
uniformNames.Sort();
sLog.Debug("Shader program active uniforms:");
foreach (string uniformName in uniformNames)
{
sLog.Debug("\tUniform {0} (Type: {1}, Location: {2})", uniformName, _UniformMap[uniformName].UniformType, _UniformMap[uniformName].Location);
}
sLog.Debug("Shader program active uniform slots: {0}", _DefaultBlockUniformSlots);
#endregion
#region Collect Active Program Inputs
// Get active inputs count
int activeInputs;
Gl.GetProgram(ObjectName, Gl.ACTIVE_ATTRIBUTES, out activeInputs);
// Get inputs maximum length for name
Gl.GetProgram(ObjectName, Gl.ACTIVE_ATTRIBUTE_MAX_LENGTH, out attributeBufferSize);
// Clear input mapping
_AttributesMap.Clear();
// Collect input location mapping
for (uint i = 0; i < (uint)activeInputs; i++)
{
StringBuilder nameBuffer = new StringBuilder(attributeBufferSize);
int nameLength, size, type;
// Mono optimize StringBuilder capacity after P/Invoke... ensure enought room for the current loop
nameBuffer.EnsureCapacity(attributeBufferSize);
// Obtain active input informations
Gl.GetActiveAttrib(ObjectName, i, attributeBufferSize, out nameLength, out size, out type, nameBuffer);
// Obtain active input location
string name = nameBuffer.ToString();
int location = Gl.GetAttribLocation(ObjectName, name);
// Map active input
_AttributesMap[name] = new AttributeBinding((uint)location, (ShaderAttributeType)type);
}
// Log attribute mapping
List <string> attributeNames = new List <string>(_AttributesMap.Keys);
// Make attribute list invariant respect the used driver (ease log comparation)
attributeNames.Sort();
sLog.Debug("Shader program active attributes:");
foreach (string attributeName in attributeNames)
{
sLog.Debug("\tAttribute {0} (Type: {1}, Location: {2})", attributeName, _AttributesMap[attributeName].Type, _AttributesMap[attributeName].Location);
}
#endregion
#region Collect Fragment Locations
if (ctx.Caps.GlExtensions.GpuShader4_EXT)
{
// Get fragment locations, just in the case automatically assigned
foreach (string fragOutputName in new List <string>(_FragLocations.Keys))
{
_FragLocations[fragOutputName] = Gl.GetFragDataLocation(ObjectName, fragOutputName);
}
}
#endregion
#region Collect Feedback Varyings
if ((_FeedbackVaryings != null) && (_FeedbackVaryings.Count > 0))
{
if (ctx.Caps.GlExtensions.TransformFeedback2_ARB || ctx.Caps.GlExtensions.TransformFeedback_EXT)
{
// Map active feedback
int feebackVaryings, feebackVaryingsMaxLength;
Gl.GetProgram(ObjectName, Gl.TRANSFORM_FEEDBACK_VARYINGS, out feebackVaryings);
Gl.GetProgram(ObjectName, Gl.TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH, out feebackVaryingsMaxLength);
for (uint i = 0; i < feebackVaryings; i++)
{
StringBuilder sb = new StringBuilder(feebackVaryingsMaxLength);
int length = 0, size = 0, type = 0;
Gl.GetTransformFeedbackVarying(ObjectName, (uint)i, feebackVaryingsMaxLength, out length, out size, out type, sb);
_FeedbacksMap.Add(sb.ToString(), new FeedbackBinding((ShaderAttributeType)type, (uint)size));
}
}
else if (ctx.Caps.GlExtensions.TransformFeedback2_NV)
{
// Activate varyings
foreach (string feedbackVaryingName in _FeedbackVaryings)
{
Gl.ActiveVaryingNV(ObjectName, feedbackVaryingName);
}
// Map active feedback
int feebackVaryings, feebackVaryingsMaxLength;
Gl.GetProgram(ObjectName, Gl.ACTIVE_VARYINGS_NV, out feebackVaryings);
Gl.GetProgram(ObjectName, Gl.ACTIVE_VARYING_MAX_LENGTH_NV, out feebackVaryingsMaxLength);
for (uint i = 0; i < feebackVaryings; i++)
{
StringBuilder sb = new StringBuilder(feebackVaryingsMaxLength * 2);
int length = 0, size = 0, type = 0;
Gl.GetActiveVaryingNV(ObjectName, (uint)i, feebackVaryingsMaxLength * 2, out length, out size, out type, sb);
_FeedbacksMap.Add(sb.ToString(), new FeedbackBinding((ShaderAttributeType)type, (uint)size));
}
// Specify feedback varyings
List <int> feedbackLocations = new List <int>();
foreach (string feedbackVaryingName in _FeedbackVaryings)
{
int location = Gl.GetVaryingLocationNV(ObjectName, feedbackVaryingName);
if (location >= 0)
{
feedbackLocations.Add(location);
}
}
Gl.TransformFeedbackVaryingsNV(ObjectName, feedbackLocations.ToArray(), (int)cctx.FeedbackVaryingsFormat);
// Map active feedback
}
Debug.Assert(_FeedbacksMap.Count > 0);
// Log feedback mapping
sLog.Debug("Shader program active feedbacks:");
foreach (string feedbackName in _FeedbacksMap.Keys)
{
sLog.Debug("\tFeedback {0} (Type: {1})", feedbackName, _FeedbacksMap[feedbackName].Type);
}
}
#endregion
}
