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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/compute.go
+26 -21
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@@ -623,17 +623,18 @@ func (g *compute) frame(target RenderTarget) error {
return err
}
t.render.end()
var d driver.LoadDesc
d := driver.LoadDesc{
ClearColor: g.collector.clearColor,
}
if g.collector.clear {
g.collector.clear = false
d.Action = driver.LoadActionClear
c := &d.ClearColor
c.R, c.G, c.B, c.A = g.collector.clearColor.Float32()
}
g.ctx.BindFramebuffer(defFBO, d)
g.ctx.BeginRenderPass(defFBO, d)
t.blit.begin()
g.blitLayers(viewport)
t.blit.end()
g.ctx.EndRenderPass()
t.compact.begin()
if err := g.compactAllocs(); err != nil {
return err
@@ -993,18 +994,18 @@ func (g *compute) renderMaterials() error {
m.vert.uniforms.scale = [2]float32{2, -2}
m.vert.uniforms.pos = [2]float32{-1, +1}
m.vert.buf.Upload(byteslice.Struct(m.vert.uniforms))
g.ctx.BindVertexUniforms(m.vert.buf)
g.ctx.BindFragmentUniforms(m.frag.buf)
vertexData := byteslice.Slice(m.quads)
n := pow2Ceil(len(vertexData))
m.buffer.ensureCapacity(false, g.ctx, driver.BufferBindingVertices, n)
m.buffer.buffer.Upload(vertexData)
g.ctx.BindTexture(0, imgAtlas.image)
var d driver.LoadDesc
if !realized {
d.Action = driver.LoadActionClear
}
g.ctx.BindFramebuffer(atlas.fbo, d)
g.ctx.BeginRenderPass(atlas.fbo, d)
g.ctx.BindVertexUniforms(m.vert.buf)
g.ctx.BindFragmentUniforms(m.frag.buf)
g.ctx.BindTexture(0, imgAtlas.image)
g.ctx.BindPipeline(m.pipeline)
g.ctx.BindVertexBuffer(m.buffer.buffer, 0)
newAllocs := atlas.allocs[allocStart:]
@@ -1013,6 +1014,7 @@ func (g *compute) renderMaterials() error {
g.ctx.Viewport(a.rect.Min.X, a.rect.Min.Y, sz.X, sz.Y)
g.ctx.DrawArrays(driver.DrawModeTriangles, i*6, 6)
}
g.ctx.EndRenderPass()
if !g.useCPU {
continue
}
@@ -1263,18 +1265,6 @@ func (g *compute) render(images *textureAtlas, dst driver.Texture, cpuDst cpu.Im
}
}
if !g.useCPU {
g.ctx.BindImageTexture(kernel4OutputUnit, dst, driver.AccessWrite, driver.TextureFormatRGBA8)
if images != nil {
g.ctx.BindImageTexture(kernel4AtlasUnit, images.image, driver.AccessRead, driver.TextureFormatRGBA8)
}
} else {
*g.output.descriptors.Binding2() = cpuDst
if images != nil {
*g.output.descriptors.Binding3() = images.cpuImage
}
}
for {
*g.memHeader = memoryHeader{
mem_offset: alloc,
@@ -1282,6 +1272,19 @@ func (g *compute) render(images *textureAtlas, dst driver.Texture, cpuDst cpu.Im
g.buffers.memory.upload(byteslice.Struct(g.memHeader))
g.buffers.state.upload(g.zeros(clearSize))
if !g.useCPU {
g.ctx.BeginCompute()
g.ctx.BindImageTexture(kernel4OutputUnit, dst, driver.AccessWrite, driver.TextureFormatRGBA8)
if images != nil {
g.ctx.BindImageTexture(kernel4AtlasUnit, images.image, driver.AccessRead, driver.TextureFormatRGBA8)
}
} else {
*g.output.descriptors.Binding2() = cpuDst
if images != nil {
*g.output.descriptors.Binding3() = images.cpuImage
}
}
g.bindBuffers()
g.memoryBarrier()
g.dispatch(g.programs.elements, numPartitions, 1, 1)
@@ -1298,7 +1301,9 @@ func (g *compute) render(images *textureAtlas, dst driver.Texture, cpuDst cpu.Im
g.memoryBarrier()
g.dispatch(g.programs.kernel4, tileDims.X, tileDims.Y, 1)
g.memoryBarrier()
if g.useCPU {
if !g.useCPU {
g.ctx.EndCompute()
} else {
g.dispatcher.Sync()
}