Shader ownership

apps/LoopThroughWithOpenGLCompositing/gl/GlobalParamsBuffer.cpp

@@ -0,0 +1,95 @@
+#include "GlobalParamsBuffer.h"
+
+#include "GlRenderConstants.h"
+#include "Std140Buffer.h"
+
+#include <vector>
+
+GlobalParamsBuffer::GlobalParamsBuffer(OpenGLRenderer& renderer) :
+	mRenderer(renderer)
+{
+}
+
+bool GlobalParamsBuffer::Update(const RuntimeRenderState& state, unsigned availableSourceHistoryLength, unsigned availableTemporalHistoryLength)
+{
+	std::vector<unsigned char> buffer;
+	buffer.reserve(512);
+
+	AppendStd140Float(buffer, static_cast<float>(state.timeSeconds));
+	AppendStd140Vec2(buffer, static_cast<float>(state.inputWidth), static_cast<float>(state.inputHeight));
+	AppendStd140Vec2(buffer, static_cast<float>(state.outputWidth), static_cast<float>(state.outputHeight));
+	AppendStd140Float(buffer, static_cast<float>(state.frameCount));
+	AppendStd140Float(buffer, static_cast<float>(state.mixAmount));
+	AppendStd140Float(buffer, static_cast<float>(state.bypass));
+	const unsigned effectiveSourceHistoryLength = availableSourceHistoryLength < state.effectiveTemporalHistoryLength
+		? availableSourceHistoryLength
+		: state.effectiveTemporalHistoryLength;
+	const unsigned effectiveTemporalHistoryLength = (state.temporalHistorySource == TemporalHistorySource::PreLayerInput)
+		? (availableTemporalHistoryLength < state.effectiveTemporalHistoryLength ? availableTemporalHistoryLength : state.effectiveTemporalHistoryLength)
+		: 0u;
+	AppendStd140Int(buffer, static_cast<int>(effectiveSourceHistoryLength));
+	AppendStd140Int(buffer, static_cast<int>(effectiveTemporalHistoryLength));
+
+	for (const ShaderParameterDefinition& definition : state.parameterDefinitions)
+	{
+		auto valueIt = state.parameterValues.find(definition.id);
+		const ShaderParameterValue value = valueIt != state.parameterValues.end()
+			? valueIt->second
+			: ShaderParameterValue();
+
+		switch (definition.type)
+		{
+		case ShaderParameterType::Float:
+			AppendStd140Float(buffer, value.numberValues.empty() ? 0.0f : static_cast<float>(value.numberValues[0]));
+			break;
+		case ShaderParameterType::Vec2:
+			AppendStd140Vec2(buffer,
+				value.numberValues.size() > 0 ? static_cast<float>(value.numberValues[0]) : 0.0f,
+				value.numberValues.size() > 1 ? static_cast<float>(value.numberValues[1]) : 0.0f);
+			break;
+		case ShaderParameterType::Color:
+			AppendStd140Vec4(buffer,
+				value.numberValues.size() > 0 ? static_cast<float>(value.numberValues[0]) : 1.0f,
+				value.numberValues.size() > 1 ? static_cast<float>(value.numberValues[1]) : 1.0f,
+				value.numberValues.size() > 2 ? static_cast<float>(value.numberValues[2]) : 1.0f,
+				value.numberValues.size() > 3 ? static_cast<float>(value.numberValues[3]) : 1.0f);
+			break;
+		case ShaderParameterType::Boolean:
+			AppendStd140Int(buffer, value.booleanValue ? 1 : 0);
+			break;
+		case ShaderParameterType::Enum:
+		{
+			int selectedIndex = 0;
+			for (std::size_t optionIndex = 0; optionIndex < definition.enumOptions.size(); ++optionIndex)
+			{
+				if (definition.enumOptions[optionIndex].value == value.enumValue)
+				{
+					selectedIndex = static_cast<int>(optionIndex);
+					break;
+				}
+			}
+			AppendStd140Int(buffer, selectedIndex);
+			break;
+		}
+		case ShaderParameterType::Text:
+			break;
+		}
+	}
+
+	buffer.resize(AlignStd140(buffer.size(), 16), 0);
+
+	glBindBuffer(GL_UNIFORM_BUFFER, mRenderer.GlobalParamsUBO());
+	if (mRenderer.GlobalParamsUBOSize() != static_cast<GLsizeiptr>(buffer.size()))
+	{
+		glBufferData(GL_UNIFORM_BUFFER, static_cast<GLsizeiptr>(buffer.size()), buffer.data(), GL_DYNAMIC_DRAW);
+		mRenderer.SetGlobalParamsUBOSize(static_cast<GLsizeiptr>(buffer.size()));
+	}
+	else
+	{
+		glBufferSubData(GL_UNIFORM_BUFFER, 0, static_cast<GLsizeiptr>(buffer.size()), buffer.data());
+	}
+	glBindBufferBase(GL_UNIFORM_BUFFER, kGlobalParamsBindingPoint, mRenderer.GlobalParamsUBO());
+	glBindBuffer(GL_UNIFORM_BUFFER, 0);
+
+	return true;
+}