mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 11:48:55 +01:00
426 lines
9.5 KiB
Go
426 lines
9.5 KiB
Go
// Copyright 2020 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package testing
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import (
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"go/constant"
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"github.com/hajimehoshi/ebiten/internal/graphics"
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"github.com/hajimehoshi/ebiten/internal/shaderir"
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)
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var (
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projectionMatrix = shaderir.Expr{
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Type: shaderir.Call,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.BuiltinFuncExpr,
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BuiltinFunc: shaderir.Mat4F,
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},
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{
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Type: shaderir.Binary,
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Op: shaderir.Div,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(2),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.FieldSelector,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.UniformVariable,
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Index: 0,
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},
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{
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Type: shaderir.SwizzlingExpr,
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Swizzling: "x",
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},
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},
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},
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},
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.Binary,
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Op: shaderir.Div,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(2),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.FieldSelector,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.UniformVariable,
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Index: 0,
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},
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{
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Type: shaderir.SwizzlingExpr,
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Swizzling: "y",
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},
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},
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},
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},
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(1),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(-1),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(-1),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(1),
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ConstType: shaderir.ConstTypeFloat,
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},
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},
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}
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vertexPosition = shaderir.Expr{
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Type: shaderir.Call,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.BuiltinFuncExpr,
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BuiltinFunc: shaderir.Vec4F,
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},
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{
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Type: shaderir.LocalVariable,
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Index: 0,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(0),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(1),
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ConstType: shaderir.ConstTypeFloat,
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},
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},
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}
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defaultVertexFunc = shaderir.VertexFunc{
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Block: &shaderir.Block{
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Stmts: []shaderir.Stmt{
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{
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Type: shaderir.Assign,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.LocalVariable,
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Index: 4, // the varying variable
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},
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{
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Type: shaderir.LocalVariable,
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Index: 1, // the 2nd attribute variable
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},
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},
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},
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{
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Type: shaderir.Assign,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.LocalVariable,
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Index: 3, // gl_Position in GLSL
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},
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{
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Type: shaderir.Binary,
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Op: shaderir.Mul,
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Exprs: []shaderir.Expr{
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projectionMatrix,
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vertexPosition,
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},
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},
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},
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},
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},
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},
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}
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)
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func defaultProgram() shaderir.Program {
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p := shaderir.Program{
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Attributes: []shaderir.Type{
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{Main: shaderir.Vec2}, // Local var (0) in the vertex shader
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{Main: shaderir.Vec2}, // Local var (1) in the vertex shader
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{Main: shaderir.Vec4}, // Local var (2) in the vertex shader
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},
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Varyings: []shaderir.Type{
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{Main: shaderir.Vec2}, // Local var (4) in the vertex shader, (1) in the fragment shader
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},
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VertexFunc: defaultVertexFunc,
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}
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p.Uniforms = make([]shaderir.Type, graphics.PreservedUniformVariablesNum)
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// Destination texture size
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p.Uniforms[0] = shaderir.Type{Main: shaderir.Vec2}
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// Source texture sizes
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p.Uniforms[1] = shaderir.Type{
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Main: shaderir.Array,
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Length: graphics.ShaderImageNum,
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Sub: []shaderir.Type{{Main: shaderir.Vec2}},
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}
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// Source texture offsets
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p.Uniforms[2] = shaderir.Type{
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Main: shaderir.Array,
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Length: graphics.ShaderImageNum - 1,
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Sub: []shaderir.Type{{Main: shaderir.Vec2}},
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}
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return p
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}
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// ShaderProgramFill returns a shader intermediate representation to fill the frambuffer.
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//
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// Uniform variable's index and its value are:
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//
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// 0: the framebuffer size (Vec2)
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func ShaderProgramFill(r, g, b, a byte) shaderir.Program {
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clr := shaderir.Expr{
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Type: shaderir.Call,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.BuiltinFuncExpr,
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BuiltinFunc: shaderir.Vec4F,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(float64(r) / 0xff),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(float64(g) / 0xff),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(float64(b) / 0xff),
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ConstType: shaderir.ConstTypeFloat,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeFloat64(float64(a) / 0xff),
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ConstType: shaderir.ConstTypeFloat,
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},
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},
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}
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p := defaultProgram()
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p.FragmentFunc = shaderir.FragmentFunc{
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Block: &shaderir.Block{
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Stmts: []shaderir.Stmt{
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{
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Type: shaderir.Assign,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.LocalVariable,
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Index: 2,
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},
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clr,
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},
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},
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},
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},
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}
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return p
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}
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// ShaderProgramImages returns a shader intermediate representation to render the frambuffer with the given images.
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//
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// Uniform variables's indices and their values are:
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//
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// 0: the framebuffer size (Vec2)
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//
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// The size and region values are actually not used in this shader so far.
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func ShaderProgramImages(imageNum int) shaderir.Program {
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if imageNum <= 0 {
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panic("testing: imageNum must be >= 1")
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}
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p := defaultProgram()
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p.TextureNum = imageNum
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// In the fragment shader, local variables are:
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//
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// 0: gl_FragCoord
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// 1: Varying variables (vec2)
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// 2: gl_FragColor
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// 3: Actual local variables in the main function
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local := shaderir.Expr{
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Type: shaderir.LocalVariable,
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Index: 3,
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}
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fragColor := shaderir.Expr{
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Type: shaderir.LocalVariable,
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Index: 2,
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}
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texPos := shaderir.Expr{
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Type: shaderir.LocalVariable,
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Index: 1,
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}
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var stmts []shaderir.Stmt
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for i := 0; i < imageNum; i++ {
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var rhs shaderir.Expr
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if i == 0 {
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rhs = shaderir.Expr{
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Type: shaderir.Call,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.BuiltinFuncExpr,
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BuiltinFunc: shaderir.Texture2DF,
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},
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{
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Type: shaderir.TextureVariable,
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Index: 0,
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},
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texPos,
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},
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}
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} else {
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texPos2 := shaderir.Expr{
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Type: shaderir.Binary,
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Op: shaderir.Add,
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Exprs: []shaderir.Expr{
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texPos,
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{
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Type: shaderir.Index,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.UniformVariable,
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Index: graphics.TextureOffsetsUniformVariableIndex,
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},
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{
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Type: shaderir.NumberExpr,
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Const: constant.MakeInt64(int64(i - 1)),
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ConstType: shaderir.ConstTypeInt,
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},
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},
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},
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},
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}
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rhs = shaderir.Expr{
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Type: shaderir.Binary,
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Op: shaderir.Add,
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Exprs: []shaderir.Expr{
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local,
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{
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Type: shaderir.Call,
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Exprs: []shaderir.Expr{
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{
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Type: shaderir.BuiltinFuncExpr,
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BuiltinFunc: shaderir.Texture2DF,
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},
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{
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Type: shaderir.TextureVariable,
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Index: i,
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},
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texPos2,
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},
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},
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},
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}
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}
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stmts = append(stmts, shaderir.Stmt{
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Type: shaderir.Assign,
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Exprs: []shaderir.Expr{
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local,
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rhs,
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},
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})
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}
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stmts = append(stmts, shaderir.Stmt{
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Type: shaderir.Assign,
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Exprs: []shaderir.Expr{
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fragColor,
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local,
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},
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})
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p.FragmentFunc = shaderir.FragmentFunc{
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Block: &shaderir.Block{
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LocalVars: []shaderir.Type{
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{Main: shaderir.Vec4},
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},
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Stmts: stmts,
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},
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}
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return p
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}
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