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gpu/internal/driver,gpu/headless: don't y-axis flip OpenGL ReadPixels images

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The CPU fallback of the compute renderer needs ReadPixels data in OpenGL
format (origin at bottom left). Unfortunately, the OpenGL driver
automatically mirrors images in the Y-axis to match the top left origin
image.RGBA.

Remove the mirroring from the driver and introduce a DownloadImage to
restore the old behaviour.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-03-08 18:12:33 +01:00
parent 2aa1cc8112
commit 69cff4b96b
4 changed files with 44 additions and 35 deletions
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gpu/headless/backend_test.go
+7 -11
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@@ -26,7 +26,7 @@ func TestFramebufferClear(t *testing.T) {
b := newBackend(t)
sz := image.Point{X: 800, Y: 600}
fbo := setupFBO(t, b, sz)
img := screenshot(t, fbo, sz)
img := screenshot(t, b, fbo, sz)
if got := img.RGBAAt(0, 0); got != clearColExpect {
t.Errorf("got color %v, expected %v", got, clearColExpect)
}
@@ -43,7 +43,7 @@ func TestSimpleShader(t *testing.T) {
defer p.Release()
b.BindProgram(p)
b.DrawArrays(driver.DrawModeTriangles, 0, 3)
img := screenshot(t, fbo, sz)
img := screenshot(t, b, fbo, sz)
if got := img.RGBAAt(0, 0); got != clearColExpect {
t.Errorf("got color %v, expected %v", got, clearColExpect)
}
@@ -90,7 +90,7 @@ func TestInputShader(t *testing.T) {
defer layout.Release()
b.BindInputLayout(layout)
b.DrawArrays(driver.DrawModeTriangles, 0, 3)
img := screenshot(t, fbo, sz)
img := screenshot(t, b, fbo, sz)
if got := img.RGBAAt(0, 0); got != clearColExpect {
t.Errorf("got color %v, expected %v", got, clearColExpect)
}
@@ -115,11 +115,11 @@ func TestFramebuffers(t *testing.T) {
b.Clear(fcol1.Float32())
b.BindFramebuffer(fbo2)
b.Clear(fcol2.Float32())
img := screenshot(t, fbo1, sz)
img := screenshot(t, b, fbo1, sz)
if got := img.RGBAAt(0, 0); got != f32color.NRGBAToRGBA(col1) {
t.Errorf("got color %v, expected %v", got, f32color.NRGBAToRGBA(col1))
}
img = screenshot(t, fbo2, sz)
img = screenshot(t, b, fbo2, sz)
if got := img.RGBAAt(0, 0); got != f32color.NRGBAToRGBA(col2) {
t.Errorf("got color %v, expected %v", got, f32color.NRGBAToRGBA(col2))
}
@@ -184,12 +184,8 @@ func newBackend(t *testing.T) driver.Device {
return b
}
func screenshot(t *testing.T, fbo driver.Framebuffer, size image.Point) *image.RGBA {
img := image.NewRGBA(image.Rectangle{Max: size})
err := fbo.ReadPixels(
image.Rectangle{
Max: image.Point{X: size.X, Y: size.Y},
}, img.Pix)
func screenshot(t *testing.T, d driver.Device, fbo driver.Framebuffer, size image.Point) *image.RGBA {
img, err := driver.DownloadImage(d, fbo, image.Rectangle{Max: size})
if err != nil {
t.Fatal(err)
}