/// <summary>
/// pixel unpack buffer's pointer.
/// </summary>
/// <param name="bufferId">用glGenBuffers()得到的VBO的Id。<para>Id got from glGenBuffers();</para></param>
/// <param name="length">此VBO含有多个个元素？<para>How many elements?</para></param>
/// <param name="byteLength">此VBO中的数据在内存中占用多少个字节？<para>How many bytes in this buffer?</para></param>
internal ShaderStorageBufferPtr(
uint bufferId, int length, int byteLength)
: base(bufferId, length, byteLength)
{
if (glShaderStorageBlockBinding == null)
{
glShaderStorageBlockBinding = OpenGL.GetDelegateFor <OpenGL.glShaderStorageBlockBinding>();
glGetProgramResourceIndex = OpenGL.GetDelegateFor <OpenGL.glGetProgramResourceIndex>();
}
}
/// <summary>
/// Bind this uniform buffer object and a uniform block to the same binding point.
/// </summary>
/// <param name="program">shader program.</param>
/// <param name="storageBlockName">name of buffer block in shader.</param>
/// <param name="storageBlockBindingPoint">binding point maintained by OpenGL context.</param>
public void Binding(ShaderProgram program, string storageBlockName, uint storageBlockBindingPoint)
{
if (glGetProgramResourceIndex == null) { glGetProgramResourceIndex = OpenGL.GetDelegateFor<OpenGL.glGetProgramResourceIndex>(); }
if (glBindBufferBase == null) { glBindBufferBase = OpenGL.GetDelegateFor<OpenGL.glBindBufferBase>(); }
if (glShaderStorageBlockBinding == null) { glShaderStorageBlockBinding = OpenGL.GetDelegateFor<OpenGL.glShaderStorageBlockBinding>(); }
uint storageBlockIndex = glGetProgramResourceIndex(program.ProgramId, OpenGL.GL_SHADER_STORAGE_BLOCK, storageBlockName);
glBindBufferBase(OpenGL.GL_SHADER_STORAGE_BUFFER, storageBlockBindingPoint, this.BufferId);
glShaderStorageBlockBinding(program.ProgramId, storageBlockIndex, storageBlockBindingPoint);
}
/// <summary>
/// Bind this uniform buffer object and a uniform block to the same binding point.
/// </summary>
/// <param name="program">shader program.</param>
/// <param name="storageBlockName">name of buffer block in shader.</param>
/// <param name="storageBlockBindingPoint">binding point maintained by OpenGL context.</param>
public void Binding(ShaderProgram program, string storageBlockName, uint storageBlockBindingPoint)
{
if (glGetProgramResourceIndex == null)
{
glGetProgramResourceIndex = OpenGL.GetDelegateFor <OpenGL.glGetProgramResourceIndex>();
}
if (glBindBufferBase == null)
{
glBindBufferBase = OpenGL.GetDelegateFor <OpenGL.glBindBufferBase>();
}
if (glShaderStorageBlockBinding == null)
{
glShaderStorageBlockBinding = OpenGL.GetDelegateFor <OpenGL.glShaderStorageBlockBinding>();
}
uint storageBlockIndex = glGetProgramResourceIndex(program.ProgramId, OpenGL.GL_SHADER_STORAGE_BLOCK, storageBlockName);
glBindBufferBase(OpenGL.GL_SHADER_STORAGE_BUFFER, storageBlockBindingPoint, this.BufferId);
glShaderStorageBlockBinding(program.ProgramId, storageBlockIndex, storageBlockBindingPoint);
}
