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ui/app/internal/gpu: check floating point FBO support

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Some devices don't support floating point FBOs even though they
support OpenGL ES 3. Check support by creating a FBO and fail early
if no support is found.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-05-13 12:44:47 +02:00
parent 8f3384ffe4
commit 18c74f00af
1 changed files with 36 additions and 14 deletions
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ui/app/internal/gpu/context.go
+36 -14
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@@ -40,7 +40,7 @@ func newContext(glctx gl.Context) (*context, error) {
if err != nil {
return nil, err
}
floatTriple, err := floatTripleFor(ver, exts)
floatTriple, err := floatTripleFor(ctx, ver, exts)
if err != nil {
return nil, err
}
@@ -57,6 +57,41 @@ func newContext(glctx gl.Context) (*context, error) {
return ctx, nil
}
// floatTripleFor determines the best texture triple for floating point FBOs.
func floatTripleFor(ctx *context, ver [2]int, exts []string) (textureTriple, error) {
var triples []textureTriple
if ver[0] >= 3 {
triples = append(triples, textureTriple{gl.R16F, gl.Enum(gl.RED), gl.Enum(gl.HALF_FLOAT)})
}
if hasExtension(exts, "GL_OES_texture_half_float") || hasExtension(exts, "EXT_color_buffer_half_float") {
triples = append(triples, textureTriple{gl.RGBA, gl.Enum(gl.RGBA), gl.Enum(gl.HALF_FLOAT_OES)})
}
if hasExtension(exts, "GL_OES_texture_float") || hasExtension(exts, "GL_EXT_color_buffer_float") {
triples = append(triples, textureTriple{gl.RGBA, gl.Enum(gl.RGBA), gl.Enum(gl.FLOAT)})
}
tex := ctx.CreateTexture()
defer ctx.DeleteTexture(tex)
ctx.BindTexture(gl.TEXTURE_2D, tex)
ctx.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
ctx.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
ctx.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
ctx.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
fbo := ctx.CreateFramebuffer()
defer ctx.DeleteFramebuffer(fbo)
defFBO := gl.Framebuffer(ctx.GetBinding(gl.FRAMEBUFFER_BINDING))
ctx.BindFramebuffer(gl.FRAMEBUFFER, fbo)
defer ctx.BindFramebuffer(gl.FRAMEBUFFER, defFBO)
for _, tt := range triples {
const size = 256
ctx.TexImage2D(gl.TEXTURE_2D, 0, tt.internalFormat, size, size, tt.format, tt.typ, nil)
ctx.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0)
if st := ctx.CheckFramebufferStatus(gl.FRAMEBUFFER); st == gl.FRAMEBUFFER_COMPLETE {
return tt, nil
}
}
return textureTriple{}, errors.New("floating point fbos not supported")
}
func srgbaTripleFor(ver [2]int, exts []string) (textureTriple, error) {
switch {
case ver[0] >= 3:
@@ -77,19 +112,6 @@ func alphaTripleFor(ver [2]int) textureTriple {
return textureTriple{intf, f, gl.UNSIGNED_BYTE}
}
func floatTripleFor(ver [2]int, exts []string) (textureTriple, error) {
switch {
case ver[0] >= 3:
return textureTriple{gl.R16F, gl.Enum(gl.RED), gl.Enum(gl.HALF_FLOAT)}, nil
case hasExtension(exts, "GL_OES_texture_half_float") || hasExtension(exts, "EXT_color_buffer_half_float"):
return textureTriple{gl.RGBA, gl.Enum(gl.RGBA), gl.Enum(gl.HALF_FLOAT_OES)}, nil
case hasExtension(exts, "GL_OES_texture_float") || hasExtension(exts, "GL_EXT_color_buffer_float"):
return textureTriple{gl.RGBA, gl.Enum(gl.RGBA), gl.Enum(gl.FLOAT)}, nil
default:
return textureTriple{}, errors.New("floating point texture not supported")
}
}
func hasExtension(exts []string, ext string) bool {
for _, e := range exts {
if ext == e {