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sheet.go
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sheet.go
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// Copyright 2016 Arne Roomann-Kurrik
//
// 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 sprites
import (
"fmt"
"github.com/go-gl/mathgl/mgl32"
"github.com/kurrik/opengl-benchmarks/common/core"
"github.com/kurrik/opengl-benchmarks/common/render"
"unsafe"
)
type Sheet struct {
keys map[string]*Sprite
texture *core.Texture
ubo *core.UniformBuffer
Count int
version int
uploadedVersion int
}
func NewSheet() *Sheet {
return &Sheet{
keys: map[string]*Sprite{},
version: 0,
uploadedVersion: -1,
ubo: core.NewUniformBuffer(),
}
}
func (s *Sheet) SetTexture(texture *core.Texture) {
s.deleteTexture()
s.texture = texture
}
func (s *Sheet) Bind() {
if s.texture != nil {
s.texture.Bind()
}
s.upload()
}
func (s *Sheet) Unbind() {
if s.texture != nil {
s.texture.Unbind()
}
}
func (s *Sheet) deleteTexture() {
if s.texture != nil {
s.texture.Delete()
s.texture = nil
}
}
func (s *Sheet) Delete() {
s.deleteTexture()
if s.ubo != nil {
s.ubo.Delete()
s.ubo = nil
}
}
func (s *Sheet) AddSprite(key string, bounds, offset mgl32.Vec2) (out *Sprite) {
var index int
index = s.Count
out = &Sprite{
index: index,
bounds: bounds,
offset: offset,
}
s.keys[key] = out
s.Count++
s.version++
return
}
func (s *Sheet) Exists(key string) (exists bool) {
_, exists = s.keys[key]
return
}
func (s *Sheet) Sprite(key string) (out *Sprite, err error) {
var exists bool
if out, exists = s.keys[key]; !exists {
err = fmt.Errorf("Invalid tile key %v", key)
return
}
return
}
func (s *Sheet) upload() (err error) {
if s.version == s.uploadedVersion {
return
}
var (
sprite *Sprite
entry render.UniformSprite
data = make([]render.UniformSprite, s.Count)
size = s.Count * int(unsafe.Sizeof(entry))
)
if s.texture == nil {
err = fmt.Errorf("No texture associated with sheet")
return
}
for _, sprite = range s.keys {
data[sprite.index] = sprite.textureBounds(s.texture.Size)
}
s.ubo.Upload(data, size)
s.uploadedVersion = s.version
return
}
func (s *Sheet) Texture() *core.Texture {
return s.texture
}
func (s *Sheet) BufferID() uint32 {
return s.ubo.BufferID()
}
func (s *Sheet) Size() int {
return s.ubo.Size()
}