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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/gpu.go
+41 -11
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@@ -424,7 +424,6 @@ func (g *gpu) frame(target RenderTarget) error {
for _, img := range g.drawOps.imageOps {
expandPathOp(img.path, img.clip)
}
g.ctx.Viewport(0, 0, viewport.X, viewport.Y)
g.stencilTimer.begin()
g.renderer.packStencils(&g.drawOps.pathOps)
g.renderer.stencilClips(g.drawOps.pathCache, g.drawOps.pathOps)
@@ -432,17 +431,19 @@ func (g *gpu) frame(target RenderTarget) error {
g.renderer.intersect(g.drawOps.imageOps)
g.stencilTimer.end()
g.coverTimer.begin()
var d driver.LoadDesc
g.renderer.uploadImages(g.cache, g.drawOps.imageOps)
d := driver.LoadDesc{
ClearColor: g.drawOps.clearColor,
}
if g.drawOps.clear {
g.drawOps.clear = false
d.Action = driver.LoadActionClear
c := &d.ClearColor
c.R, c.G, c.B, c.A = g.drawOps.clearColor.Float32()
}
g.ctx.BindFramebuffer(defFBO, d)
g.ctx.BeginRenderPass(defFBO, d)
g.ctx.Viewport(0, 0, viewport.X, viewport.Y)
g.renderer.drawOps(g.cache, g.drawOps.imageOps)
g.coverTimer.end()
g.ctx.EndRenderPass()
g.cleanupTimer.begin()
g.cache.frame()
g.drawOps.pathCache.frame()
@@ -669,13 +670,21 @@ func (r *renderer) stencilClips(pathCache *opCache, ops []*pathOp) {
r.pather.begin(r.packer.sizes)
for _, p := range ops {
if fbo != p.place.Idx {
if fbo != -1 {
r.ctx.EndRenderPass()
}
fbo = p.place.Idx
f := r.pather.stenciler.cover(fbo)
r.ctx.BindFramebuffer(f.fbo, driver.LoadDesc{Action: driver.LoadActionClear})
r.ctx.BeginRenderPass(f.fbo, driver.LoadDesc{Action: driver.LoadActionClear})
r.ctx.BindPipeline(r.pather.stenciler.pipeline.pipeline.pipeline)
r.ctx.BindIndexBuffer(r.pather.stenciler.indexBuf)
}
v, _ := pathCache.get(p.pathKey)
r.pather.stencilPath(p.clip, p.off, p.place.Pos, v.data)
}
if fbo != -1 {
r.ctx.EndRenderPass()
}
}
func (r *renderer) intersect(ops []imageOp) {
@@ -684,21 +693,28 @@ func (r *renderer) intersect(ops []imageOp) {
}
fbo := -1
r.pather.stenciler.beginIntersect(r.intersections.sizes)
r.ctx.BindVertexBuffer(r.blitter.quadVerts, 0)
for _, img := range ops {
if img.clipType != clipTypeIntersection {
continue
}
if fbo != img.place.Idx {
if fbo != -1 {
r.ctx.EndRenderPass()
}
fbo = img.place.Idx
f := r.pather.stenciler.intersections.fbos[fbo]
d := driver.LoadDesc{Action: driver.LoadActionClear}
d.ClearColor.R = 1.0
r.ctx.BindFramebuffer(f.fbo, d)
r.ctx.BeginRenderPass(f.fbo, d)
r.ctx.BindPipeline(r.pather.stenciler.ipipeline.pipeline.pipeline)
r.ctx.BindVertexBuffer(r.blitter.quadVerts, 0)
}
r.ctx.Viewport(img.place.Pos.X, img.place.Pos.Y, img.clip.Dx(), img.clip.Dy())
r.intersectPath(img.path, img.clip)
}
if fbo != -1 {
r.ctx.EndRenderPass()
}
}
func (r *renderer) intersectPath(p *pathOp, clip image.Rectangle) {
@@ -1077,8 +1093,16 @@ func (d *drawState) materialFor(rect f32.Rectangle, off f32.Point, partTrans f32
return m
}
func (r *renderer) uploadImages(cache *resourceCache, ops []imageOp) {
for _, img := range ops {
m := img.material
if m.material == materialTexture {
r.texHandle(cache, m.data)
}
}
}
func (r *renderer) drawOps(cache *resourceCache, ops []imageOp) {
r.ctx.BindVertexBuffer(r.blitter.quadVerts, 0)
var coverTex driver.Texture
for _, img := range ops {
m := img.material
@@ -1092,6 +1116,9 @@ func (r *renderer) drawOps(cache *resourceCache, ops []imageOp) {
var fbo stencilFBO
switch img.clipType {
case clipTypeNone:
p := r.blitter.pipelines[m.material]
r.ctx.BindPipeline(p.pipeline)
r.ctx.BindVertexBuffer(r.blitter.quadVerts, 0)
r.blitter.blit(m.material, m.color, m.color1, m.color2, scale, off, m.uvTrans)
continue
case clipTypePath:
@@ -1108,6 +1135,9 @@ func (r *renderer) drawOps(cache *resourceCache, ops []imageOp) {
Max: img.place.Pos.Add(drc.Size()),
}
coverScale, coverOff := texSpaceTransform(layout.FRect(uv), fbo.size)
p := r.pather.coverer.pipelines[m.material]
r.ctx.BindPipeline(p.pipeline)
r.ctx.BindVertexBuffer(r.blitter.quadVerts, 0)
r.pather.cover(m.material, m.color, m.color1, m.color2, scale, off, m.uvTrans, coverScale, coverOff)
}
}
@@ -1165,12 +1195,12 @@ func (u *uniformBuffer) Release() {
func (p *pipeline) UploadUniforms(ctx driver.Device) {
if p.vertUniforms != nil {
ctx.BindVertexUniforms(p.vertUniforms.buf)
p.vertUniforms.Upload()
ctx.BindVertexUniforms(p.vertUniforms.buf)
}
if p.fragUniforms != nil {
ctx.BindFragmentUniforms(p.fragUniforms.buf)
p.fragUniforms.Upload()
ctx.BindFragmentUniforms(p.fragUniforms.buf)
}
}