/// <summary>
/// Set a single uniform, optionally structured.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used to share common state between shaders.
/// </param>
/// <param name="uniformContainer">
/// A <see cref="IShaderUniformContainer"/> that specify this uniform state.
/// </param>
/// <param name="uniformPattern"></param>
/// <param name="uniformValue"></param>
private void ApplyUniform(GraphicsContext ctx, IShaderUniformContainer uniformContainer, string uniformPattern, object uniformValue)
{
List <UniformStateMember> structuredTypeMembers;
if (_TypeUniformState.TryGetValue(uniformValue.GetType(), out structuredTypeMembers))
{
// Recurse over structure fields
ApplyState(ctx, uniformContainer, uniformPattern, structuredTypeMembers, uniformValue);
}
else
{
uniformContainer.SetUniform(ctx, uniformPattern, uniformValue);
}
}
/// <summary>
/// Apply this state to a shader program.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used to share common state between shaders.
/// </param>
/// <param name="uniformContainer">
/// A <see cref="IShaderUniformContainer"/> that specify this uniform state.
/// </param>
/// <param name="uniformScope">
/// A <see cref="String"/> that specify the scope the uniform variable.
/// </param>
private void ApplyState(GraphicsContext ctx, IShaderUniformContainer uniformContainer, string uniformScope, IEnumerable <UniformStateMember> uniforms, object instance)
{
if (uniformContainer == null)
{
throw new ArgumentNullException("shaderProgram");
}
if (uniforms == null)
{
throw new ArgumentNullException("uniforms");
}
if (instance == null)
{
throw new ArgumentNullException("instance");
}
foreach (UniformStateMember uniform in uniforms)
{
// Set the program uniform
string uniformPattern = uniformScope != null?String.Format("{0}.{1}", uniformScope, uniform.UniformName) : uniform.UniformName;
// Matches also partial uniform variables (i.e. glo_Struct[0] or glo_Struct while glo_Struct[0].Member is active)
// Indeed quite efficient when structures are not active (skip all members)
if (uniformContainer.IsActiveUniform(uniformPattern) == false)
{
continue;
}
object uniformValue = uniform.GetUniformValue(instance);
// Silently skip null references
if (uniformValue == null)
{
continue;
}
Type uniformValueType = uniformValue.GetType();
if (uniformValueType.IsArray)
{
Array uniformArray = (Array)uniformValue;
for (int i = 0; i < uniformArray.Length; i++)
{
string uniformArrayPattern = String.Format("{0}[{1}]", uniformPattern, i);
if (uniformContainer.IsActiveUniform(uniformArrayPattern) == false)
{
continue;
}
object uniformArrayValue = uniformArray.GetValue(i);
// Silently skip null references
if (uniformArrayValue == null)
{
continue;
}
ApplyUniform(ctx, uniformContainer, uniformArrayPattern, uniformArrayValue);
}
}
else
{
ApplyUniform(ctx, uniformContainer, uniformPattern, uniformValue);
}
}
}