[gtk] gl renderer: Sync gpu and cpu default alpha value

[Timm Bäder <baedert src gnome org>]

commit 91bbe6ef9518e42904d08f9ec6acbaf62eda2387
Author: Timm Bäder <mail baedert org>
Date:   Wed Apr 24 12:56:44 2019 +0200

    gl renderer: Sync gpu and cpu default alpha value
    
    Otherwise we might end up not passing the new value to the GPU.

 gsk/gl/gskglrenderer.c         |  4 ++--
 gsk/gl/gskglrenderops.c        | 16 ++++++++++++++++
 gsk/gl/gskglrenderopsprivate.h |  2 +-
 3 files changed, 19 insertions(+), 3 deletions(-)
---
diff --git a/gsk/gl/gskglrenderer.c b/gsk/gl/gskglrenderer.c
index 1dafe4521e..1ee037feb7 100644
--- a/gsk/gl/gskglrenderer.c
+++ b/gsk/gl/gskglrenderer.c
@@ -2927,11 +2927,11 @@ gsk_gl_renderer_do_render (GskRenderer           *renderer,
   gsk_gl_glyph_cache_begin_frame (&self->glyph_cache);
   gsk_gl_shadow_cache_begin_frame (&self->shadow_cache, self->gl_driver);
 
-  memset (&render_op_builder, 0, sizeof (render_op_builder));
+  /* TODO: REALLY USE ONE BUILDER FOREVER! shader state is not per-frame... */
+  ops_init (&render_op_builder);
   render_op_builder.renderer = self;
   render_op_builder.current_projection = projection;
   render_op_builder.current_viewport = *viewport;
-  render_op_builder.current_opacity = 1.0f;
   render_op_builder.render_ops = self->render_ops;
   ops_set_modelview (&render_op_builder, &modelview,
                      scale_factor == 1 ? GSK_TRANSFORM_CATEGORY_IDENTITY : GSK_TRANSFORM_CATEGORY_2D_AFFINE);
diff --git a/gsk/gl/gskglrenderops.c b/gsk/gl/gskglrenderops.c
index beb94a5967..f4c887fa59 100644
--- a/gsk/gl/gskglrenderops.c
+++ b/gsk/gl/gskglrenderops.c
@@ -149,6 +149,22 @@ ops_transform_bounds_modelview (const RenderOpBuilder *builder,
   dst->origin.y += builder->dy * head->metadata.scale_y;
 }
 
+void
+ops_init (RenderOpBuilder *builder)
+{
+  int i;
+
+  memset (builder, 0, sizeof (*builder));
+
+  builder->current_opacity = 1.0f;
+
+  for (i = 0; i < GL_N_PROGRAMS; i ++)
+    {
+      builder->program_state[i].opacity = 1.0f;
+    }
+
+}
+
 void
 ops_set_program (RenderOpBuilder *builder,
                  const Program   *program)
diff --git a/gsk/gl/gskglrenderopsprivate.h b/gsk/gl/gskglrenderopsprivate.h
index f54440aa30..a2608b7450 100644
--- a/gsk/gl/gskglrenderopsprivate.h
+++ b/gsk/gl/gskglrenderopsprivate.h
@@ -277,7 +277,7 @@ void              ops_dump_framebuffer   (RenderOpBuilder         *builder,
                                           const char              *filename,
                                           int                      width,
                                           int                      height);
-
+void              ops_init               (RenderOpBuilder         *builder);
 void              ops_finish             (RenderOpBuilder         *builder);
 void              ops_push_modelview     (RenderOpBuilder         *builder,
                                           const graphene_matrix_t *mv,