/// <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>
/// Create the resource of this attachment.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for creating this attachment.
/// </param>
public override void Create(GraphicsContext ctx)
{
if (!Texture.Exists(ctx))
{
Texture.Create(ctx);
}
}
/// <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>
/// Set uniform state variable (sampler1D, sampler2D, sampler3D, samplerCube variable).
/// </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="tex">
/// A <see cref="Texture"/> holding the uniform variabile data (the texture name).
/// </param>
/// <param name="texUnit">
/// A <see cref="Int32"/> that specify the texture unit processing the texture <paramref name="tex"/>.
/// </param>
public void SetUniform(GraphicsContext ctx, string uniformName, Texture tex, uint texUnit)
{
if (ctx == null)
throw new ArgumentNullException("ctx");
UniformBinding uniform = GetUniform(uniformName);
if (tex == null)
throw new ArgumentNullException("tex");
if (tex.Exists(ctx) == false)
throw new ArgumentException("not exists", "tex");
CheckProgramBinding();
CheckUniformType(uniform, tex.SamplerType);
// Activate texture unit
Gl.ActiveTexture(Gl.TEXTURE0 + (int)texUnit);
// Bind texture (on active texture unit)
tex.Bind(ctx);
// Apply texture parameters
tex.ApplyParameters(ctx);
// Set uniform value (sampler)
// Cast to Int32 since the sampler type can be set only with glUniform2i
Gl.Uniform1(uniform.Location, (int)texUnit);
// Validate program
Validate();
}