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gpu: introduce render passes

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Modern GPU API such as Metal and Vulkan use explicit render passes
and command buffers for recording rendering commands. They don't have
global state; each render pass starts with a clean set of bound
textures, pipeline etc.

Change our GPU abstraction to better match newer API and modify our two
renderers to explicitly describe their render passes.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-09-03 10:05:35 +02:00
parent af6770de18
commit cc2edbaa51
9 changed files with 252 additions and 228 deletions
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gpu/internal/opengl/opengl.go
+12 -3
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@@ -660,7 +660,7 @@ func (b *Backend) NewFramebuffer(tex driver.Texture) (driver.Framebuffer, error)
gltex := tex.(*texture)
fb := b.funcs.CreateFramebuffer()
fbo := &framebuffer{backend: b, obj: fb}
b.BindFramebuffer(fbo, driver.LoadDesc{})
b.glstate.bindFramebuffer(b.funcs, gl.FRAMEBUFFER, fbo.obj)
if err := glErr(b.funcs); err != nil {
fbo.Release()
return nil, err
@@ -1194,7 +1194,7 @@ func (b *Backend) CopyTexture(dst driver.Texture, dstOrigin image.Point, src dri
func (f *framebuffer) ReadPixels(src image.Rectangle, pixels []byte, stride int) error {
glErr(f.backend.funcs)
f.backend.BindFramebuffer(f, driver.LoadDesc{})
f.backend.glstate.bindFramebuffer(f.backend.funcs, gl.FRAMEBUFFER, f.obj)
if len(pixels) < src.Dx()*src.Dy()*4 {
return errors.New("unexpected RGBA size")
}
@@ -1217,7 +1217,13 @@ func (b *Backend) BindPipeline(pl driver.Pipeline) {
b.BlendFunc(p.blend.SrcFactor, p.blend.DstFactor)
}
func (b *Backend) BindFramebuffer(fbo driver.Framebuffer, desc driver.LoadDesc) {
func (b *Backend) BeginCompute() {
}
func (b *Backend) EndCompute() {
}
func (b *Backend) BeginRenderPass(fbo driver.Framebuffer, desc driver.LoadDesc) {
b.glstate.bindFramebuffer(b.funcs, gl.FRAMEBUFFER, fbo.(*framebuffer).obj)
switch desc.Action {
case driver.LoadActionClear:
@@ -1228,6 +1234,9 @@ func (b *Backend) BindFramebuffer(fbo driver.Framebuffer, desc driver.LoadDesc)
}
}
func (b *Backend) EndRenderPass() {
}
func (f *framebuffer) Release() {
if f.foreign {
panic("framebuffer not created by NewFramebuffer")