Method define_uniform

source/effect_codegen_glsl.cpp:864–935

		return res;
	}
	id   define_uniform(const location &loc, uniform &info) override
	{
		const id res = make_id();
		define_name<naming::unique>(res, info.unique_name);

		if (_uniforms_to_spec_constants && info.has_initializer_value)
		{
			info.size = info.type.components() * 4;
			if (info.type.is_array())
				info.size *= info.type.array_length;

			std::string &code = _blocks.at(_current_block);

			write_location(code, loc);

			assert(!info.type.has(type::q_static) && !info.type.has(type::q_const));

			code += "const ";
			write_type(code, info.type);
			code += ' ' + id_to_name(res) + " = ";
			if (!info.type.is_scalar())
				write_type<false, false>(code, info.type);
			code += "(SPEC_CONSTANT_" + info.unique_name + ");\n";

			_module.spec_constants.push_back(info);
		}
		else
		{
			// GLSL specification on std140 layout:
			// 1. If the member is a scalar consuming N basic machine units, the base alignment is N.
			// 2. If the member is a two- or four-component vector with components consuming N basic machine units, the base alignment is 2N or 4N, respectively.
			// 3. If the member is a three-component vector with components consuming N basic machine units, the base alignment is 4N.
			// 4. If the member is an array of scalars or vectors, the base alignment and array stride are set to match the base alignment of a single array element,
			//    according to rules (1), (2), and (3), and rounded up to the base alignment of a four-component vector.
			// 7. If the member is a row-major matrix with C columns and R rows, the matrix is stored identically to an array of R row vectors with C components each, according to rule (4).
			// 8. If the member is an array of S row-major matrices with C columns and R rows, the matrix is stored identically to a row of S*R row vectors with C components each, according to rule (4).
			uint32_t alignment = (info.type.rows == 3 ? 4 /* (3) */ : info.type.rows /* (2) */) * 4 /* (1) */;
			info.size = info.type.rows * 4;

			if (info.type.is_matrix())
			{
				alignment = 16 /* (4) */;
				info.size = info.type.rows * alignment /* (7), (8) */;
			}
			if (info.type.is_array())
			{
				alignment = 16 /* (4) */;
				info.size = align_up(info.size, alignment) * info.type.array_length;
			}

			// Adjust offset according to alignment rules from above
			info.offset = _module.total_uniform_size;
			info.offset = align_up(info.offset, alignment);
			_module.total_uniform_size = info.offset + info.size;

			write_location(_ubo_block, loc);

			_ubo_block += '\t';