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"
"github.com/hajimehoshi/ebiten/v2/internal/atlas"
"github.com/hajimehoshi/ebiten/v2/internal/graphics"
"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
)
type Shader struct {
shader *atlas.Shader
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uniformNames []string
uniformTypes []shaderir.Type
uniformUint32Count int
}
func NewShader(ir *shaderir.Program, name string) *Shader {
return &Shader{
shader: atlas.NewShader(ir, name),
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uniformNames: ir.UniformNames[graphics.PreservedUniformVariablesCount:],
uniformTypes: ir.Uniforms[graphics.PreservedUniformVariablesCount:],
}
}
func (s *Shader) Deallocate() {
s.shader.Deallocate()
}
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func (s *Shader) AppendUniforms(dst []uint32, uniforms map[string]any) []uint32 {
if s.uniformUint32Count == 0 {
for _, typ := range s.uniformTypes {
s.uniformUint32Count += typ.Uint32Count()
}
}
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origLen := len(dst)
if cap(dst)-len(dst) >= s.uniformUint32Count {
dst = dst[:len(dst)+s.uniformUint32Count]
for i := origLen; i < len(dst); i++ {
dst[i] = 0
}
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} else {
dst = append(dst, make([]uint32, s.uniformUint32Count)...)
}
idx := origLen
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for i, name := range s.uniformNames {
typ := s.uniformTypes[i]
// Ignore if an unused name is specified (#2710).
if uv, ok := uniforms[name]; ok {
v := reflect.ValueOf(uv)
t := v.Type()
switch t.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
if typ.Uint32Count() != 1 {
panic(fmt.Sprintf("ui: unexpected uniform value for %s (%s)", name, typ.String()))
}
dst[idx] = uint32(v.Int())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
if typ.Uint32Count() != 1 {
panic(fmt.Sprintf("ui: unexpected uniform value for %s (%s)", name, typ.String()))
}
dst[idx] = uint32(v.Uint())
case reflect.Float32, reflect.Float64:
if typ.Uint32Count() != 1 {
panic(fmt.Sprintf("ui: unexpected uniform value for %s (%s)", name, typ.String()))
}
dst[idx] = math.Float32bits(float32(v.Float()))
case reflect.Slice, reflect.Array:
l := v.Len()
if typ.Uint32Count() != l {
panic(fmt.Sprintf("ui: unexpected uniform value for %s (%s)", name, typ.String()))
}
switch t.Elem().Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
for i := 0; i < l; i++ {
dst[idx+i] = uint32(v.Index(i).Int())
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
for i := 0; i < l; i++ {
dst[idx+i] = uint32(v.Index(i).Uint())
}
case reflect.Float32, reflect.Float64:
for i := 0; i < l; i++ {
dst[idx+i] = math.Float32bits(float32(v.Index(i).Float()))
}
default:
panic(fmt.Sprintf("ui: unexpected uniform value type: %s (%s)", name, v.Kind().String()))
}
default:
panic(fmt.Sprintf("ui: unexpected uniform value type: %s (%s)", name, v.Kind().String()))
}
}
idx += typ.Uint32Count()
}
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return dst
}