Texture binding

2026-05-08 17:04:28 +10:00
parent 7d8f9a39d1
commit f458eb0130
7 changed files with 181 additions and 78 deletions
--- a/apps/LoopThroughWithOpenGLCompositing/gl/shader/ShaderTextureBindings.cpp
+++ b/apps/LoopThroughWithOpenGLCompositing/gl/shader/ShaderTextureBindings.cpp
@@ -102,3 +102,122 @@ GLint ShaderTextureBindings::FindSamplerUniformLocation(GLuint program, const st
 		return location;
 	return glGetUniformLocation(program, (samplerName + "_0").c_str());
 }
+
+GLuint ShaderTextureBindings::ResolveShaderTextureBase(const RuntimeRenderState& state, unsigned historyCap) const
+{
+	return state.isTemporal ? kSourceHistoryTextureUnitBase + historyCap + historyCap : kSourceHistoryTextureUnitBase;
+}
+
+void ShaderTextureBindings::AssignLayerSamplerUniforms(GLuint program, const RuntimeRenderState& state, const LayerProgram& layerProgram, unsigned historyCap) const
+{
+	const GLuint shaderTextureBase = ResolveShaderTextureBase(state, historyCap);
+
+	const GLint videoInputLocation = glGetUniformLocation(program, "gVideoInput");
+	if (videoInputLocation >= 0)
+		glUniform1i(videoInputLocation, static_cast<GLint>(kDecodedVideoTextureUnit));
+
+	for (unsigned index = 0; index < historyCap; ++index)
+	{
+		const std::string sourceSamplerName = "gSourceHistory" + std::to_string(index);
+		const GLint sourceSamplerLocation = glGetUniformLocation(program, sourceSamplerName.c_str());
+		if (sourceSamplerLocation >= 0)
+			glUniform1i(sourceSamplerLocation, static_cast<GLint>(kSourceHistoryTextureUnitBase + index));
+
+		const std::string temporalSamplerName = "gTemporalHistory" + std::to_string(index);
+		const GLint temporalSamplerLocation = glGetUniformLocation(program, temporalSamplerName.c_str());
+		if (temporalSamplerLocation >= 0)
+			glUniform1i(temporalSamplerLocation, static_cast<GLint>(kSourceHistoryTextureUnitBase + historyCap + index));
+	}
+
+	for (std::size_t index = 0; index < layerProgram.textureBindings.size(); ++index)
+	{
+		const GLint textureSamplerLocation = FindSamplerUniformLocation(program, layerProgram.textureBindings[index].samplerName);
+		if (textureSamplerLocation >= 0)
+			glUniform1i(textureSamplerLocation, static_cast<GLint>(shaderTextureBase + static_cast<GLuint>(index)));
+	}
+
+	const GLuint textTextureBase = shaderTextureBase + static_cast<GLuint>(layerProgram.textureBindings.size());
+	for (std::size_t index = 0; index < layerProgram.textBindings.size(); ++index)
+	{
+		const GLint textSamplerLocation = FindSamplerUniformLocation(program, layerProgram.textBindings[index].samplerName);
+		if (textSamplerLocation >= 0)
+			glUniform1i(textSamplerLocation, static_cast<GLint>(textTextureBase + static_cast<GLuint>(index)));
+	}
+}
+
+ShaderTextureBindings::RuntimeTextureBindingPlan ShaderTextureBindings::BuildLayerRuntimeBindingPlan(
+	const LayerProgram& layerProgram,
+	GLuint layerInputTexture,
+	const std::vector<GLuint>& sourceHistoryTextures,
+	const std::vector<GLuint>& temporalHistoryTextures) const
+{
+	RuntimeTextureBindingPlan plan;
+	plan.bindings.push_back({ "layerInput", "gVideoInput", layerInputTexture, kDecodedVideoTextureUnit });
+
+	for (std::size_t index = 0; index < sourceHistoryTextures.size(); ++index)
+	{
+		plan.bindings.push_back({
+			"sourceHistory",
+			"gSourceHistory" + std::to_string(index),
+			sourceHistoryTextures[index],
+			kSourceHistoryTextureUnitBase + static_cast<GLuint>(index)
+		});
+	}
+
+	const GLuint temporalBase = kSourceHistoryTextureUnitBase + static_cast<GLuint>(sourceHistoryTextures.size());
+	for (std::size_t index = 0; index < temporalHistoryTextures.size(); ++index)
+	{
+		plan.bindings.push_back({
+			"temporalHistory",
+			"gTemporalHistory" + std::to_string(index),
+			temporalHistoryTextures[index],
+			temporalBase + static_cast<GLuint>(index)
+		});
+	}
+
+	const GLuint shaderTextureBase = layerProgram.shaderTextureBase != 0 ? layerProgram.shaderTextureBase : kSourceHistoryTextureUnitBase;
+	for (std::size_t index = 0; index < layerProgram.textureBindings.size(); ++index)
+	{
+		const LayerProgram::TextureBinding& textureBinding = layerProgram.textureBindings[index];
+		plan.bindings.push_back({
+			"shaderTexture",
+			textureBinding.samplerName,
+			textureBinding.texture,
+			shaderTextureBase + static_cast<GLuint>(index)
+		});
+	}
+
+	const GLuint textTextureBase = shaderTextureBase + static_cast<GLuint>(layerProgram.textureBindings.size());
+	for (std::size_t index = 0; index < layerProgram.textBindings.size(); ++index)
+	{
+		const LayerProgram::TextBinding& textBinding = layerProgram.textBindings[index];
+		plan.bindings.push_back({
+			"textTexture",
+			textBinding.samplerName,
+			textBinding.texture,
+			textTextureBase + static_cast<GLuint>(index)
+		});
+	}
+
+	return plan;
+}
+
+void ShaderTextureBindings::BindRuntimeTexturePlan(const RuntimeTextureBindingPlan& plan) const
+{
+	for (const RuntimeTextureBinding& binding : plan.bindings)
+	{
+		glActiveTexture(GL_TEXTURE0 + binding.textureUnit);
+		glBindTexture(GL_TEXTURE_2D, binding.texture);
+	}
+	glActiveTexture(GL_TEXTURE0);
+}
+
+void ShaderTextureBindings::UnbindRuntimeTexturePlan(const RuntimeTextureBindingPlan& plan) const
+{
+	for (const RuntimeTextureBinding& binding : plan.bindings)
+	{
+		glActiveTexture(GL_TEXTURE0 + binding.textureUnit);
+		glBindTexture(GL_TEXTURE_2D, 0);
+	}
+	glActiveTexture(GL_TEXTURE0);
+}