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context.go
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context.go
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package gli
import (
"fmt"
"github.com/PieterD/glimmer/raw"
)
type Deletable interface {
Delete()
}
type Context struct {
r raw.Raw
currentBuffer map[iBindTarget]*Buffer
currentVertexArray *VertexArray
attributeIndexCounter int
attributeIndexMap map[string]attributeIndexType
}
type attributeIndexType struct {
index int
typ FullType
}
func New(r raw.Raw) *Context {
return &Context{
r: r,
currentBuffer: make(map[iBindTarget]*Buffer),
attributeIndexMap: make(map[string]attributeIndexType),
}
}
func (ctx *Context) Init() error {
err := ctx.r.Init()
if err != nil {
return fmt.Errorf("Failed to initialize opengl: %v", err)
}
return nil
}
func (ctx *Context) Viewport(x, y, width, height int) {
ctx.r.Viewport(x, y, width, height)
}
func (ctx *Context) ClearColor(r, g, b, a float32) {
ctx.r.ClearColor(r, g, b, a)
}
func (ctx *Context) SafeDelete(deletables ...Deletable) {
for _, deletable := range deletables {
//TODO: Does this work, or do I need to unpack the interface to get at the inner nil?
if deletable != nil {
deletable.Delete()
}
}
}
func (ctx *Context) VertexAttribute(fulltype FullType, names ...string) {
if len(names) == 0 {
return
}
if !fulltype.DataType.ValidAttribute() {
panic(fmt.Errorf("Invalid vertex attribute type: %s", fulltype.String()))
}
index := ctx.attributeIndexCounter
for _, name := range names {
_, ok := ctx.attributeIndexMap[name]
if ok {
panic(fmt.Errorf("Set the same attribute more than once: %s %s", fulltype.String(), name))
}
ctx.attributeIndexMap[name] = attributeIndexType{
index: index,
typ: fulltype,
}
}
ctx.attributeIndexCounter += calculateLocationSize(fulltype)
}
func calculateLocationSize(fulltype FullType) int {
var size int
switch fulltype.DataType {
case Float, Float2, Float3, Float4:
size = 1
case FloatMat2, FloatMat2x3, FloatMat2x4:
size = 2
case FloatMat3, FloatMat3x2, FloatMat3x4:
size = 3
case FloatMat4, FloatMat4x2, FloatMat4x3:
size = 4
case Int, Int2, Int3, Int4, UInt, UInt2, UInt3, UInt4:
size = 1
case Double, Double2, Double3, Double4:
size = 1
case DoubleMat2, DoubleMat2x3, DoubleMat2x4:
size = 2
case DoubleMat3, DoubleMat3x2, DoubleMat3x4:
size = 3
case DoubleMat4, DoubleMat4x2, DoubleMat4x3:
size = 4
default:
panic(fmt.Errorf("Invalid attribute type when calculating size: %s", fulltype.String()))
}
if fulltype.ArraySize > 0 {
size *= int(fulltype.ArraySize)
}
return size
}