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Add conditional expression/statement support for shaders

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This commit is contained in:
Jérôme Leclercq
2020-11-19 13:56:54 +01:00
parent ad88561245
commit 960817a1f1
45 changed files with 996 additions and 56 deletions
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18
src/Nazara/Shader/GlslWriter.cpp
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@@ -48,12 +48,13 @@ namespace Nz
{
}
std::string GlslWriter::Generate(const ShaderAst& shader)
std::string GlslWriter::Generate(const ShaderAst& shader, const States& conditions)
{
std::string error;
if (!ValidateShader(shader, &error))
throw std::runtime_error("Invalid shader AST: " + error);
m_context.states = &conditions;
m_context.shader = &shader;
State state;
@@ -461,6 +462,21 @@ namespace Nz
Append(")");
}
void GlslWriter::Visit(ShaderNodes::ConditionalExpression& node)
{
if (m_context.states->enabledConditions.count(node.conditionName) != 0)
Visit(node.truePath);
else
Visit(node.falsePath);
}
void GlslWriter::Visit(ShaderNodes::ConditionalStatement& node)
{
if (m_context.states->enabledConditions.count(node.conditionName) != 0)
Visit(node.statement);
}
void GlslWriter::Visit(ShaderNodes::Constant& node)
{
std::visit([&](auto&& arg)