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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/path.go
+1 -6
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@@ -346,7 +346,6 @@ func (s *stenciler) beginIntersect(sizes []image.Point) {
// floating point formats. Replace with GL_RGB+GL_UNSIGNED_BYTE if
// no floating point support is available.
s.intersections.resize(s.ctx, sizes)
s.ctx.BindPipeline(s.ipipeline.pipeline.pipeline)
}
func (s *stenciler) cover(idx int) stencilFBO {
@@ -355,8 +354,6 @@ func (s *stenciler) cover(idx int) stencilFBO {
func (s *stenciler) begin(sizes []image.Point) {
s.fbos.resize(s.ctx, sizes)
s.ctx.BindPipeline(s.pipeline.pipeline.pipeline)
s.ctx.BindIndexBuffer(s.indexBuf)
}
func (s *stenciler) stencilPath(bounds image.Rectangle, offset f32.Point, uv image.Point, data pathData) {
@@ -388,8 +385,6 @@ func (p *pather) cover(mat materialType, col f32color.RGBA, col1, col2 f32color.
}
func (c *coverer) cover(mat materialType, col f32color.RGBA, col1, col2 f32color.RGBA, scale, off f32.Point, uvTrans f32.Affine2D, coverScale, coverOff f32.Point) {
p := c.pipelines[mat]
c.ctx.BindPipeline(p.pipeline)
var uniforms *coverUniforms
switch mat {
case materialColor:
@@ -411,7 +406,7 @@ func (c *coverer) cover(mat materialType, col f32color.RGBA, col1, col2 f32color
}
uniforms.transform = [4]float32{scale.X, scale.Y, off.X, off.Y}
uniforms.uvCoverTransform = [4]float32{coverScale.X, coverScale.Y, coverOff.X, coverOff.Y}
p.UploadUniforms(c.ctx)
c.pipelines[mat].UploadUniforms(c.ctx)
c.ctx.DrawArrays(driver.DrawModeTriangleStrip, 0, 4)
}