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ui/app/internal/gpu: introduce caps and context

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Enables graceful fallback to OpenGL ES 2 and WebGL.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-05-04 11:45:28 +02:00
parent 8df5feeeea
commit d118bd5a88
4 changed files with 130 additions and 102 deletions
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ui/app/internal/gpu/path.go
+31 -31
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@@ -15,7 +15,7 @@ import (
)
type pather struct {
ctx *gl.Functions
ctx *context
viewport image.Point
@@ -24,7 +24,7 @@ type pather struct {
}
type coverer struct {
ctx *gl.Functions
ctx *context
prog [2]gl.Program
vars [2]struct {
z gl.Uniform
@@ -36,7 +36,7 @@ type coverer struct {
}
type stenciler struct {
ctx *gl.Functions
ctx *context
defFBO gl.Framebuffer
indexBufQuads int
prog gl.Program
@@ -77,7 +77,7 @@ var (
intersectAttribs = []string{"pos", "uv"}
)
func newPather(ctx *gl.Functions) *pather {
func newPather(ctx *context) *pather {
return &pather{
ctx: ctx,
stenciler: newStenciler(ctx),
@@ -85,7 +85,7 @@ func newPather(ctx *gl.Functions) *pather {
}
}
func newCoverer(ctx *gl.Functions) *coverer {
func newCoverer(ctx *context) *coverer {
prog, err := createColorPrograms(ctx, coverVSrc, coverFSrc)
if err != nil {
panic(err)
@@ -98,42 +98,42 @@ func newCoverer(ctx *gl.Functions) *coverer {
ctx.UseProgram(prog)
switch materialType(i) {
case materialTexture:
uTex := gl.GetUniformLocation(ctx, prog, "tex")
uTex := gl.GetUniformLocation(ctx.Functions, prog, "tex")
ctx.Uniform1i(uTex, 0)
c.vars[i].uUVScale = gl.GetUniformLocation(ctx, prog, "uvScale")
c.vars[i].uUVOffset = gl.GetUniformLocation(ctx, prog, "uvOffset")
c.vars[i].uUVScale = gl.GetUniformLocation(ctx.Functions, prog, "uvScale")
c.vars[i].uUVOffset = gl.GetUniformLocation(ctx.Functions, prog, "uvOffset")
case materialColor:
c.vars[i].uColor = gl.GetUniformLocation(ctx, prog, "color")
c.vars[i].uColor = gl.GetUniformLocation(ctx.Functions, prog, "color")
}
uCover := gl.GetUniformLocation(ctx, prog, "cover")
uCover := gl.GetUniformLocation(ctx.Functions, prog, "cover")
ctx.Uniform1i(uCover, 1)
c.vars[i].z = gl.GetUniformLocation(ctx, prog, "z")
c.vars[i].uScale = gl.GetUniformLocation(ctx, prog, "scale")
c.vars[i].uOffset = gl.GetUniformLocation(ctx, prog, "offset")
c.vars[i].uCoverUVScale = gl.GetUniformLocation(ctx, prog, "uvCoverScale")
c.vars[i].uCoverUVOffset = gl.GetUniformLocation(ctx, prog, "uvCoverOffset")
c.vars[i].z = gl.GetUniformLocation(ctx.Functions, prog, "z")
c.vars[i].uScale = gl.GetUniformLocation(ctx.Functions, prog, "scale")
c.vars[i].uOffset = gl.GetUniformLocation(ctx.Functions, prog, "offset")
c.vars[i].uCoverUVScale = gl.GetUniformLocation(ctx.Functions, prog, "uvCoverScale")
c.vars[i].uCoverUVOffset = gl.GetUniformLocation(ctx.Functions, prog, "uvCoverOffset")
}
return c
}
func newStenciler(ctx *gl.Functions) *stenciler {
func newStenciler(ctx *context) *stenciler {
defFBO := gl.Framebuffer(ctx.GetBinding(gl.FRAMEBUFFER_BINDING))
prog, err := gl.CreateProgram(ctx, stencilVSrc, stencilFSrc, pathAttribs)
prog, err := gl.CreateProgram(ctx.Functions, stencilVSrc, stencilFSrc, pathAttribs)
if err != nil {
panic(err)
}
uAreaLUT := gl.GetUniformLocation(ctx, prog, "areaLUT")
uAreaLUT := gl.GetUniformLocation(ctx.Functions, prog, "areaLUT")
ctx.UseProgram(prog)
ctx.Uniform1i(uAreaLUT, 0)
areaLUT, err := loadLUT(ctx, genAreaLUT(256, 256))
if err != nil {
panic(err)
}
iprog, err := gl.CreateProgram(ctx, intersectVSrc, intersectFSrc, intersectAttribs)
iprog, err := gl.CreateProgram(ctx.Functions, intersectVSrc, intersectFSrc, intersectAttribs)
if err != nil {
panic(err)
}
coverLoc := gl.GetUniformLocation(ctx, iprog, "cover")
coverLoc := gl.GetUniformLocation(ctx.Functions, iprog, "cover")
ctx.UseProgram(iprog)
ctx.Uniform1i(coverLoc, 0)
return &stenciler{
@@ -142,16 +142,16 @@ func newStenciler(ctx *gl.Functions) *stenciler {
prog: prog,
iprog: iprog,
areaLUT: areaLUT,
uScale: gl.GetUniformLocation(ctx, prog, "scale"),
uOffset: gl.GetUniformLocation(ctx, prog, "offset"),
uPathOffset: gl.GetUniformLocation(ctx, prog, "pathOffset"),
uIntersectUVScale: gl.GetUniformLocation(ctx, iprog, "uvScale"),
uIntersectUVOffset: gl.GetUniformLocation(ctx, iprog, "uvOffset"),
uScale: gl.GetUniformLocation(ctx.Functions, prog, "scale"),
uOffset: gl.GetUniformLocation(ctx.Functions, prog, "offset"),
uPathOffset: gl.GetUniformLocation(ctx.Functions, prog, "pathOffset"),
uIntersectUVScale: gl.GetUniformLocation(ctx.Functions, iprog, "uvScale"),
uIntersectUVOffset: gl.GetUniformLocation(ctx.Functions, iprog, "uvOffset"),
indexBuf: ctx.CreateBuffer(),
}
}
func (s *fboSet) resize(ctx *gl.Functions, sizes []image.Point, internalFormat int, format, ty gl.Enum) {
func (s *fboSet) resize(ctx *context, sizes []image.Point, internalFormat int, format, ty gl.Enum) {
// Add fbos.
for i := len(s.fbos); i < len(sizes); i++ {
tex := ctx.CreateTexture()
@@ -186,14 +186,14 @@ func (s *fboSet) resize(ctx *gl.Functions, sizes []image.Point, internalFormat i
s.delete(ctx, len(sizes))
}
func (s *fboSet) invalidate(ctx *gl.Functions) {
func (s *fboSet) invalidate(ctx *context) {
for _, f := range s.fbos {
ctx.BindFramebuffer(gl.FRAMEBUFFER, f.fbo)
ctx.InvalidateFramebuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0)
}
}
func (s *fboSet) delete(ctx *gl.Functions, idx int) {
func (s *fboSet) delete(ctx *context, idx int) {
for i := idx; i < len(s.fbos); i++ {
f := s.fbos[i]
ctx.DeleteFramebuffer(f.fbo)
@@ -220,7 +220,7 @@ func (c *coverer) release() {
}
}
func buildPath(ctx *gl.Functions, p *path.Path) *pathData {
func buildPath(ctx *context, p *path.Path) *pathData {
buf := ctx.CreateBuffer()
ctx.BindBuffer(gl.ARRAY_BUFFER, buf)
ctx.BufferData(gl.ARRAY_BUFFER, gl.BytesView(p.Vertices), gl.STATIC_DRAW)
@@ -230,7 +230,7 @@ func buildPath(ctx *gl.Functions, p *path.Path) *pathData {
}
}
func (p *pathData) release(ctx *gl.Functions) {
func (p *pathData) release(ctx *context) {
ctx.DeleteBuffer(p.data)
}
@@ -364,7 +364,7 @@ func (c *coverer) cover(z float32, mat materialType, col [4]float32, scale, off,
c.ctx.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
}
func loadLUT(ctx *gl.Functions, lut *image.Gray) (gl.Texture, error) {
func loadLUT(ctx *context, lut *image.Gray) (gl.Texture, error) {
tex := ctx.CreateTexture()
ctx.BindTexture(gl.TEXTURE_2D, tex)
ctx.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)