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gpu,gpu/internal,internal/gl: replace BlitFramebuffer with CopyTexture

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OpenGL ES 2.0 doesn't support glBlitFramebuffer, but does support
glCopyTexSubImage2D. Fortunately, we don't need the extra features of
glBlitFramebuffer anyway.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-08-21 11:11:38 +02:00
parent 44adf01768
commit c9970cb8e3
8 changed files with 32 additions and 20 deletions
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gpu/internal/opengl/opengl.go
+9 -8
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@@ -1166,15 +1166,16 @@ func (b *Backend) BindIndexBuffer(buf driver.Buffer) {
b.glstate.bindBuffer(b.funcs, gl.ELEMENT_ARRAY_BUFFER, gbuf.obj)
}
func (b *Backend) BlitFramebuffer(dst, src driver.Framebuffer, srect image.Rectangle, dorig image.Point) {
b.glstate.bindFramebuffer(b.funcs, gl.DRAW_FRAMEBUFFER, dst.(*framebuffer).obj)
func (b *Backend) CopyTexture(dst driver.Texture, dstOrigin image.Point, src driver.Framebuffer, srcRect image.Rectangle) {
const unit = 0
oldTex := b.glstate.texUnits.binds[unit]
defer func() {
b.glstate.bindTexture(b.funcs, unit, oldTex)
}()
b.glstate.bindTexture(b.funcs, unit, dst.(*texture).obj)
b.glstate.bindFramebuffer(b.funcs, gl.READ_FRAMEBUFFER, src.(*framebuffer).obj)
drect := image.Rectangle{Min: dorig, Max: dorig.Add(srect.Size())}
b.funcs.BlitFramebuffer(
srect.Min.X, srect.Min.Y, srect.Max.X, srect.Max.Y,
drect.Min.X, drect.Min.Y, drect.Max.X, drect.Max.Y,
gl.COLOR_BUFFER_BIT,
gl.NEAREST)
sz := srcRect.Size()
b.funcs.CopyTexSubImage2D(gl.TEXTURE_2D, 0, dstOrigin.X, dstOrigin.Y, srcRect.Min.X, srcRect.Min.Y, sz.X, sz.Y)
}
func (f *framebuffer) ReadPixels(src image.Rectangle, pixels []byte) error {