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LibSoftGPU: Define a simple shader instruction set
This adds a simple instruction set with basic operations and adds an instruction list to the shader class.
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4 changed files with 74 additions and 3 deletions
63
Userland/Libraries/LibSoftGPU/ISA.h
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63
Userland/Libraries/LibSoftGPU/ISA.h
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/*
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* Copyright (c) 2022, Stephan Unverwerth <s.unverwerth@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Types.h>
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namespace SoftGPU {
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constexpr u8 swizzle_pattern(u8 a, u8 b, u8 c, u8 d)
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{
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return a | (b << 2) | (c << 4) | (d << 6);
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}
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constexpr u8 swizzle_index(u8 pattern, u8 element)
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{
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return (pattern & (3 << (element * 2))) >> (element * 2);
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}
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enum class Opcode : u8 {
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Input,
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Output,
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Sample2D,
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Swizzle,
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Add,
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Sub,
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Mul,
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Div,
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};
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struct Instruction final {
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union Arguments {
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struct {
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u16 target_register;
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u8 input_index;
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} input;
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struct {
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u16 source_register;
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u8 output_index;
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} output;
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struct {
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u16 target_register;
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u16 coordinates_register;
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u8 sampler_index;
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} sample;
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struct {
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u16 target_register;
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u16 source_register;
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u8 pattern;
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} swizzle;
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struct {
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u16 target_register;
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u16 source_register1;
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u16 source_register2;
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} binop;
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} arguments;
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Opcode operation;
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};
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}
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