/// <summary>
/// Create or update resources defined by this IGraphicsState, based on the associated <see cref="ShaderProgram"/>.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for allocating resources.
/// </param>
/// <param name="shaderProgram">
/// A <see cref="ShaderProgram"/> that will be used in conjunction with this IGraphicsState.
/// </param>
public override void Create(GraphicsContext ctx, ShaderProgram shaderProgram)
{
// Create IGraphicsResource uniforms (i.e. textures)
Dictionary <string, UniformStateMember> uniformState = UniformState;
foreach (KeyValuePair <string, UniformStateMember> pair in uniformState)
{
if (pair.Value.GetUniformType().GetInterface("IGraphicsResource") == null)
{
continue;
}
IGraphicsResource graphicsResource = pair.Value.GetUniformValue(this) as IGraphicsResource;
if (graphicsResource == null)
{
continue;
}
// Create the IGraphicsResource associated with the uniform state variable
graphicsResource.Create(ctx);
}
// Create uniform buffer, if supported
if (UniformBlockTag != null && shaderProgram != null && shaderProgram.IsActiveUniformBlock(UniformBlockTag) && UniformBuffer == null)
{
_UniformBuffer = shaderProgram.CreateUniformBlock(UniformBlockTag, MapBufferUsageMask.MapWriteBit);
_UniformBuffer.Create(ctx);
}
// Base implementation
base.Create(ctx, shaderProgram);
}
protected override void DoInitialize()
{
{
// particleSimulator-fountain.comp is also OK.
var shaderCode = new ShaderCode(File.ReadAllText(@"shaders\ParticleSimulatorRenderer\particleSimulator.comp"), ShaderType.ComputeShader);
this.computeProgram = shaderCode.CreateProgram();
}
{
BufferPtr bufferPtr = this.positionBufferPtr;
Texture texture = bufferPtr.DumpBufferTexture(OpenGL.GL_RGBA32F, autoDispose: false);
texture.Initialize();
this.positionTexture = texture;
}
{
BufferPtr bufferPtr = this.velocityBufferPtr;
Texture texture = bufferPtr.DumpBufferTexture(OpenGL.GL_RGBA32F, autoDispose: false);
texture.Initialize();
this.velocityTexture = texture;
}
{
IndependentBufferPtr bufferPtr = null;
using (var buffer = new UniformBuffer <vec4>(BufferUsage.DynamicCopy, noDataCopyed: true))
{
buffer.Create(elementCount: 64);
bufferPtr = buffer.GetBufferPtr();
}
bufferPtr.Bind();
OpenGL.BindBufferBase((BindBufferBaseTarget)BufferTarget.UniformBuffer, 0, bufferPtr.BufferId);
this.attractorBufferPtr = bufferPtr;
bufferPtr.Unbind();
}
}
protected override void DoInitialize()
{
{
// particleSimulator-fountain.comp is also OK.
var shaderCode = new ShaderCode(File.ReadAllText(@"shaders\ParticleSimulatorRenderer\particleSimulator.comp"), ShaderType.ComputeShader);
this.computeProgram = shaderCode.CreateProgram();
}
{
GLBuffer buffer = this.positionBuffer;
Texture texture = buffer.DumpBufferTexture(OpenGL.GL_RGBA32F, autoDispose: false);
texture.Initialize();
this.positionTexture = texture;
}
{
GLBuffer buffer = this.velocityBuffer;
Texture texture = buffer.DumpBufferTexture(OpenGL.GL_RGBA32F, autoDispose: false);
texture.Initialize();
this.velocityTexture = texture;
}
{
const int length = 64;
UniformBuffer buffer = UniformBuffer.Create(typeof(vec4), length, BufferUsage.DynamicCopy);
buffer.Bind();
OpenGL.BindBufferBase((BindBufferBaseTarget)BufferTarget.UniformBuffer, 0, buffer.BufferId);
buffer.Unbind();
this.attractorBuffer = buffer;
OpenGL.CheckError();
}
}
/// <summary>
/// Apply this depth test render state.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> which has defined the shader program <paramref name="shaderProgram"/>.
/// </param>
/// <param name="shaderProgram">
/// The <see cref="ShaderProgram"/> which has the state set.
/// </param>
public override void Apply(GraphicsContext ctx, ShaderProgram shaderProgram)
{
if (UniformBlockTag != null && shaderProgram != null && shaderProgram.IsActiveUniformBlock(UniformBlockTag))
{
// Ensure uniform buffer existing
if (UniformBuffer == null)
{
_UniformBuffer = shaderProgram.CreateUniformBlock(UniformBlockTag, MapBufferUsageMask.MapWriteBit);
_UniformBuffer.Create(ctx);
}
// Apply uniforms to uniform buffer
ApplyState(ctx, shaderProgram, String.Empty);
// Set uniform block
shaderProgram.SetUniformBlock(ctx, UniformBlockTag, _UniformBuffer);
}
else
{
// Apply uniforms to program
ApplyState(ctx, shaderProgram, String.Empty);
}
}
