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opengl: Avoid using encoding/binary for speed

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This commit is contained in:
Hajime Hoshi 2016-02-24 01:32:56 +09:00
parent e8a3e04535
commit 2d78d14e83
1 changed files with 20 additions and 14 deletions
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34
internal/graphics/opengl/context.go
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@ -17,8 +17,6 @@
package opengl
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
@ -294,24 +292,36 @@ func (c *Context) DisableVertexAttribArray(p Program, location string) {
gl.DisableVertexAttribArray(mgl.Attrib(l))
}
func uint16ToBytes(v []uint16) []byte {
b := make([]byte, len(v) * 2)
for i, x := range v {
b[2*i] = byte(x)
b[2*i+1] = byte(x >> 8)
}
return b
}
func int16ToBytes(v []int16) []byte {
b := make([]byte, len(v) * 2)
for i, x := range v {
b[2*i] = byte(uint16(x))
b[2*i+1] = byte(uint16(x) >> 8)
}
return b
}
func (c *Context) NewBuffer(bufferType BufferType, v interface{}, bufferUsage BufferUsage) Buffer {
b := gl.CreateBuffer()
gl.BindBuffer(mgl.Enum(bufferType), b)
//var bb []byte
switch v := v.(type) {
case int:
gl.BufferInit(mgl.Enum(bufferType), v, mgl.Enum(bufferUsage))
return Buffer(b)
case []uint16:
case []float32:
gl.BufferData(mgl.Enum(bufferType), uint16ToBytes(v), mgl.Enum(bufferUsage))
default:
panic("not reach")
}
bt := &bytes.Buffer{}
if err := binary.Write(bt, binary.LittleEndian, v); err != nil {
panic(fmt.Sprintf("opengl: Binary error: %v", err))
}
gl.BufferData(mgl.Enum(bufferType), bt.Bytes(), mgl.Enum(bufferUsage))
return Buffer(b)
}
@ -320,11 +330,7 @@ func (c *Context) BindElementArrayBuffer(b Buffer) {
}
func (c *Context) BufferSubData(bufferType BufferType, data []int16) {
bt := &bytes.Buffer{}
if err := binary.Write(bt, binary.LittleEndian, data); err != nil {
panic(fmt.Sprintf("opengl: Binary error: %v", err))
}
gl.BufferSubData(mgl.Enum(bufferType), 0, bt.Bytes())
gl.BufferSubData(mgl.Enum(bufferType), 0, int16ToBytes(data))
}
func (c *Context) DrawElements(mode Mode, len int) {