ebiten/internal/ui/shader.go

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// Copyright 2022 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ui
import (
"fmt"
"math"
"reflect"
"strings"
"github.com/hajimehoshi/ebiten/v2/internal/mipmap"
"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
)
type Shader struct {
shader *mipmap.Shader
uniformNames []string
uniformTypes []shaderir.Type
uniformNameToIndex map[string]int
uniformNameToType map[string]shaderir.Type
}
func NewShader(ir *shaderir.Program) *Shader {
return &Shader{
shader: mipmap.NewShader(ir),
uniformNames: ir.UniformNames,
uniformTypes: ir.Uniforms,
}
}
func (s *Shader) MarkDisposed() {
s.shader.MarkDisposed()
s.shader = nil
}
func (s *Shader) ConvertUniforms(uniforms map[string]any) [][]uint32 {
nameToU32s := map[string][]uint32{}
for name, v := range uniforms {
v := reflect.ValueOf(v)
t := v.Type()
switch t.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
nameToU32s[name] = []uint32{uint32(v.Int())}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
nameToU32s[name] = []uint32{uint32(v.Uint())}
case reflect.Float32, reflect.Float64:
nameToU32s[name] = []uint32{math.Float32bits(float32(v.Float()))}
case reflect.Slice:
// TODO: Allow reflect.Array (#2448)
u32s := make([]uint32, v.Len())
switch t.Elem().Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
for i := range u32s {
u32s[i] = uint32(v.Index(i).Int())
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
for i := range u32s {
u32s[i] = uint32(v.Index(i).Uint())
}
case reflect.Float32, reflect.Float64:
for i := range u32s {
u32s[i] = math.Float32bits(float32(v.Index(i).Float()))
}
default:
panic(fmt.Sprintf("ebiten: unexpected uniform value type: %s (%s)", name, v.Kind().String()))
}
nameToU32s[name] = u32s
default:
panic(fmt.Sprintf("ebiten: unexpected uniform value type: %s (%s)", name, v.Kind().String()))
}
}
if s.uniformNameToIndex == nil {
s.uniformNameToIndex = map[string]int{}
s.uniformNameToType = map[string]shaderir.Type{}
var idx int
for i, n := range s.uniformNames {
if strings.HasPrefix(n, "__") {
continue
}
s.uniformNameToIndex[n] = idx
s.uniformNameToType[n] = s.uniformTypes[i]
idx++
}
}
us := make([][]uint32, len(s.uniformNameToIndex))
for name, idx := range s.uniformNameToIndex {
if v, ok := nameToU32s[name]; ok {
us[idx] = v
continue
}
t := s.uniformNameToType[name]
us[idx] = make([]uint32, t.Uint32Count())
}
// TODO: Panic if uniforms include an invalid name
return us
}