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gpu: add depthBits parameter to NewFramebuffer

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Along with ReadPixels in the next change, a Framebuffer with depth is enough to
implement screenshot functionality on top of any Backend.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2020-02-22 07:53:49 +01:00
parent 10484d26f3
commit 6fd545a4d8
4 changed files with 37 additions and 6 deletions
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gpu/gl/backend.go
+29 -4
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@@ -54,11 +54,15 @@ type gpuTexture struct {
backend *Backend
obj Texture
triple textureTriple
width int
height int
}
type gpuFramebuffer struct {
funcs Functions
obj Framebuffer
funcs Functions
obj Framebuffer
hasDepth bool
depthBuf Renderbuffer
}
type gpuBuffer struct {
@@ -162,7 +166,7 @@ func (b *Backend) IsTimeContinuous() bool {
return b.funcs.GetInteger(GPU_DISJOINT_EXT) == FALSE
}
func (b *Backend) NewFramebuffer(tex gpu.Texture) (gpu.Framebuffer, error) {
func (b *Backend) NewFramebuffer(tex gpu.Texture, depthBits int) (gpu.Framebuffer, error) {
glErr(b.funcs)
gltex := tex.(*gpuTexture)
fb := b.funcs.CreateFramebuffer()
@@ -173,6 +177,24 @@ func (b *Backend) NewFramebuffer(tex gpu.Texture) (gpu.Framebuffer, error) {
return nil, err
}
b.funcs.FramebufferTexture2D(FRAMEBUFFER, COLOR_ATTACHMENT0, TEXTURE_2D, gltex.obj, 0)
if depthBits > 0 {
size := Enum(DEPTH_COMPONENT16)
switch {
case depthBits > 24:
size = DEPTH_COMPONENT32F
case depthBits > 16:
size = DEPTH_COMPONENT24
}
depthBuf := b.funcs.CreateRenderbuffer()
b.funcs.BindRenderbuffer(RENDERBUFFER, depthBuf)
b.funcs.RenderbufferStorage(RENDERBUFFER, size, gltex.width, gltex.height)
fbo.depthBuf = depthBuf
fbo.hasDepth = true
if err := glErr(b.funcs); err != nil {
fbo.Release()
return nil, err
}
}
if st := b.funcs.CheckFramebufferStatus(FRAMEBUFFER); st != FRAMEBUFFER_COMPLETE {
fbo.Release()
return nil, fmt.Errorf("incomplete framebuffer, status = 0x%x, err = %d", st, b.funcs.GetError())
@@ -186,7 +208,7 @@ func (b *Backend) DefaultFramebuffer() gpu.Framebuffer {
func (b *Backend) NewTexture(format gpu.TextureFormat, width, height int, minFilter, magFilter gpu.TextureFilter, binding gpu.BufferBinding) (gpu.Texture, error) {
glErr(b.funcs)
tex := &gpuTexture{backend: b, obj: b.funcs.CreateTexture()}
tex := &gpuTexture{backend: b, obj: b.funcs.CreateTexture(), width: width, height: height}
switch format {
case gpu.TextureFormatFloat:
tex.triple = b.floatTriple
@@ -578,6 +600,9 @@ func (f *gpuFramebuffer) Invalidate() {
func (f *gpuFramebuffer) Release() {
f.funcs.DeleteFramebuffer(f.obj)
if f.hasDepth {
f.funcs.DeleteRenderbuffer(f.depthBuf)
}
}
func toTexFilter(f gpu.TextureFilter) int {