[vlc-devel] [PATCH 2/5] opengl: initialize pl_gpu

Thomas Guillem thomas at gllm.fr
Mon Aug 31 13:40:31 CEST 2020


Hello,

The commit log could be improved. What is a pl_gpu and why ?

On Mon, Aug 31, 2020, at 10:29, Alexandre Janniaux wrote:
> Hi,
> 
> On Mon, Aug 31, 2020 at 07:02:45AM +0200, Steve Lhomme wrote:
> > If it depends on a libplacebo version, it should check the version match via
> > the version in the headers or by detecting the feature in configure.ac
> 
> pl_gpu_dummy should be available in all supported
> libplacebo versions, but what's missing are the
> descriptors which allows libplacebo to describe the
> shader's requirement and VLC to integrate the
> libplacebo shader within its own.
> 
> Your comment applies to patch 5/5 however.
> 
> Regards,
> --
> Alexandre Janniaux
> Videolabs
> 
> >
> > On 2020-08-28 18:49, Louis R├ęgnier wrote:
> > > ---
> > >   modules/video_output/opengl/sampler.c | 41 +++++++++++++++++++++++++++
> > >   1 file changed, 41 insertions(+)
> > >
> > > diff --git a/modules/video_output/opengl/sampler.c b/modules/video_output/opengl/sampler.c
> > > index 4cfeada6ba..ace1d723e1 100644
> > > --- a/modules/video_output/opengl/sampler.c
> > > +++ b/modules/video_output/opengl/sampler.c
> > > @@ -960,7 +960,48 @@ vlc_gl_sampler_New(struct vlc_gl_interop *interop)
> > >   #ifdef HAVE_LIBPLACEBO
> > >       // Create the main libplacebo context
> > > +    struct pl_gpu_dummy_params gpu_dummy_params = {
> > > +        .caps = PL_GPU_CAP_INPUT_VARIABLES,
> > > +        .glsl = (struct pl_glsl_desc) {
> > > +#       ifdef USE_OPENGL_ES2
> > > +            .version = 100,
> > > +            .gles = true,
> > > +#       else
> > > +            .version = 120,
> > > +#       endif
> > > +            .vulkan = false,
> > > +        },
> > > +    };
> > > +
> > > +    const opengl_vtable_t *vt = interop->vt;
> > > +
> > > +    vt->GetIntegerv(GL_MAX_TEXTURE_SIZE,
> > > +                    (GLint *)&gpu_dummy_params.limits.max_tex_1d_dim);
> > > +    gpu_dummy_params.limits.max_tex_2d_dim = gpu_dummy_params.limits.max_tex_1d_dim;
> > > +    vt->GetIntegerv(GL_MAX_3D_TEXTURE_SIZE,
> > > +                    (GLint *)&gpu_dummy_params.limits.max_tex_3d_dim);
> > > +    vt->GetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE,
> > > +                    (GLint *)&gpu_dummy_params.limits.max_ubo_size);
> > > +    vt->GetIntegerv(GL_MAX_SHADER_STORAGE_BLOCK_SIZE,
> > > +                    (GLint *)&gpu_dummy_params.limits.max_ssbo_size);
> > > +    vt->GetIntegerv(GL_MIN_PROGRAM_TEXTURE_GATHER_OFFSET_ARB,
> > > +                    (GLint *)&gpu_dummy_params.limits.min_gather_offset);
> > > +    vt->GetIntegerv(GL_MAX_PROGRAM_TEXTURE_GATHER_OFFSET_ARB,
> > > +                    (GLint *)&gpu_dummy_params.limits.max_gather_offset);
> > > +    vt->GetIntegerv(GL_MAX_COMPUTE_SHARED_MEMORY_SIZE,
> > > +                    (GLint *)&gpu_dummy_params.limits.max_shmem_size);
> > > +    vt->GetIntegerv(GL_MAX_COMPUTE_WORK_GROUP_INVOCATIONS,
> > > +                    (GLint *)&gpu_dummy_params.limits.max_group_threads);
> > > +    for (int i = 0; i < 3; i++)
> > > +    {
> > > +        vt->GetIntegeri_v(GL_MAX_COMPUTE_WORK_GROUP_COUNT, i,
> > > +                          (GLint *)&gpu_dummy_params.limits.max_dispatch[i]);
> > > +        vt->GetIntegeri_v(GL_MAX_COMPUTE_WORK_GROUP_SIZE, i,
> > > +                          (GLint *)&gpu_dummy_params.limits.max_group_size[i]);
> > > +    }
> > >       priv->pl_ctx = vlc_placebo_Create(VLC_OBJECT(interop->gl));
> > > +    priv->pl_gpu = pl_gpu_dummy_create(priv->pl_ctx, &gpu_dummy_params);
> > > +
> > >       if (priv->pl_ctx) {
> > >   #   if PL_API_VER >= 20
> > >           priv->pl_sh = pl_shader_alloc(priv->pl_ctx, &(struct pl_shader_params) {
> > > --
> > > 2.28.0
> > >
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