gpu: rename NewBuffer to NewImmutableBuffer

Prepare for adding NewBuffer for mutable buffers.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

gpu/backend.go

@@ -22,7 +22,7 @@ type Backend interface {
 	DefaultFramebuffer() Framebuffer
 	NilTexture() Texture
 	NewFramebuffer() Framebuffer
-	NewBuffer(typ BufferType, data []byte) Buffer
+	NewImmutableBuffer(typ BufferType, data []byte) Buffer
 	NewProgram(vertexShader, fragmentShader ShaderSources) (Program, error)
 	NewInputLayout(vertexShader ShaderSources, layout []InputDesc) (InputLayout, error)
 

gpu/gl/backend.go

@@ -162,7 +162,7 @@ func (b *Backend) NewTexture(minFilter, magFilter gpu.TextureFilter) gpu.Texture
 	return tex
 }
 
-func (b *Backend) NewBuffer(typ gpu.BufferType, data []byte) gpu.Buffer {
+func (b *Backend) NewImmutableBuffer(typ gpu.BufferType, data []byte) gpu.Buffer {
 	obj := b.funcs.CreateBuffer()
 	var gltyp Enum
 	switch typ {

gpu/gpu.go

@@ -376,7 +376,7 @@ func newBlitter(ctx Backend) *blitter {
 	if err != nil {
 		panic(err)
 	}
-	quadVerts := ctx.NewBuffer(BufferTypeVertices,
+	quadVerts := ctx.NewImmutableBuffer(BufferTypeVertices,
 		gunsafe.BytesView([]float32{
 			-1, +1, 0, 0,
 			+1, +1, 1, 0,

gpu/path.go

@@ -142,7 +142,7 @@ func newStenciler(ctx Backend) *stenciler {
 		indices[i*6+4] = i*4 + 1
 		indices[i*6+5] = i*4 + 3
 	}
-	indexBuf := ctx.NewBuffer(BufferTypeIndices, gunsafe.BytesView(indices))
+	indexBuf := ctx.NewImmutableBuffer(BufferTypeIndices, gunsafe.BytesView(indices))
 	progLayout, err := ctx.NewInputLayout(shader_stencil_vert, []InputDesc{
 		{Type: DataTypeShort, Size: 2, Offset: int(unsafe.Offsetof((*(*path.Vertex)(nil)).CornerX))},
 		{Type: DataTypeFloat, Size: 1, Offset: int(unsafe.Offsetof((*(*path.Vertex)(nil)).MaxY))},
@@ -239,7 +239,7 @@ func (c *coverer) release() {
 }
 
 func buildPath(ctx Backend, p []byte) *pathData {
-	buf := ctx.NewBuffer(BufferTypeVertices, p)
+	buf := ctx.NewImmutableBuffer(BufferTypeVertices, p)
 	return &pathData{
 		ncurves: len(p) / path.VertStride,
 		data:    buf,