mirror of
https://github.com/bloeys/nmage.git
synced 2025-12-29 13:28:20 +00:00
47 lines
950 B
Go
Executable File
47 lines
950 B
Go
Executable File
package buffers
|
|
|
|
import (
|
|
"github.com/bloeys/nmage/logging"
|
|
"github.com/go-gl/gl/v4.1-core/gl"
|
|
)
|
|
|
|
type IndexBuffer struct {
|
|
Id uint32
|
|
// IndexBufCount is the number of elements in the index buffer. Updated in IndexBuffer.SetData
|
|
IndexBufCount int32
|
|
}
|
|
|
|
func (ib *IndexBuffer) Bind() {
|
|
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, ib.Id)
|
|
}
|
|
|
|
func (ib *IndexBuffer) UnBind() {
|
|
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0)
|
|
}
|
|
|
|
func (ib *IndexBuffer) SetData(values []uint32) {
|
|
|
|
ib.Bind()
|
|
|
|
sizeInBytes := len(values) * 4
|
|
ib.IndexBufCount = int32(len(values))
|
|
|
|
if sizeInBytes == 0 {
|
|
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, 0, gl.Ptr(nil), BufUsage_Static.ToGL())
|
|
} else {
|
|
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, sizeInBytes, gl.Ptr(&values[0]), BufUsage_Static.ToGL())
|
|
}
|
|
}
|
|
|
|
func NewIndexBuffer() IndexBuffer {
|
|
|
|
ib := IndexBuffer{}
|
|
|
|
gl.GenBuffers(1, &ib.Id)
|
|
if ib.Id == 0 {
|
|
logging.ErrLog.Println("Failed to create OpenGL buffer")
|
|
}
|
|
|
|
return ib
|
|
}
|