[mutter] cogl: Move texture unit state to CoglGLContext

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 245977e525f34d8cd162132cf3f743857649a1a3
Author: Adam Jackson <ajax redhat com>
Date:   Thu Apr 9 14:12:31 2020 -0400

    cogl: Move texture unit state to CoglGLContext
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1194

 cogl/cogl/cogl-context-private.h           |  3 ---
 cogl/cogl/driver/gl/cogl-pipeline-opengl.c | 39 ++++++++++++++++++------------
 cogl/cogl/driver/gl/cogl-util-gl-private.h |  5 +++-
 cogl/cogl/driver/gl/cogl-util-gl.c         | 14 +++++++++--
 4 files changed, 39 insertions(+), 22 deletions(-)
---
diff --git a/cogl/cogl/cogl-context-private.h b/cogl/cogl/cogl-context-private.h
index 594b80c301..79d4f7b5ed 100644
--- a/cogl/cogl/cogl-context-private.h
+++ b/cogl/cogl/cogl-context-private.h
@@ -121,9 +121,6 @@ struct _CoglContext
 
   CoglMatrixEntry identity_entry;
 
-  GArray           *texture_units;
-  int               active_texture_unit;
-
   /* Only used for comparing other pipelines when reading pixels. */
   CoglPipeline     *opaque_color_pipeline;
 
diff --git a/cogl/cogl/driver/gl/cogl-pipeline-opengl.c b/cogl/cogl/driver/gl/cogl-pipeline-opengl.c
index 44a968a2cf..df1ce13e2d 100644
--- a/cogl/cogl/driver/gl/cogl-pipeline-opengl.c
+++ b/cogl/cogl/driver/gl/cogl-pipeline-opengl.c
@@ -94,47 +94,51 @@ CoglTextureUnit *
 _cogl_get_texture_unit (int index_)
 {
   _COGL_GET_CONTEXT (ctx, NULL);
+  CoglGLContext *glctx = _cogl_driver_gl_context(ctx);
 
-  if (ctx->texture_units->len < (index_ + 1))
+  if (glctx->texture_units->len < (index_ + 1))
     {
       int i;
-      int prev_len = ctx->texture_units->len;
-      ctx->texture_units = g_array_set_size (ctx->texture_units, index_ + 1);
+      int prev_len = glctx->texture_units->len;
+      glctx->texture_units = g_array_set_size (glctx->texture_units,
+                                               index_ + 1);
       for (i = prev_len; i <= index_; i++)
         {
           CoglTextureUnit *unit =
-            &g_array_index (ctx->texture_units, CoglTextureUnit, i);
+            &g_array_index (glctx->texture_units, CoglTextureUnit, i);
 
           texture_unit_init (ctx, unit, i);
         }
     }
 
-  return &g_array_index (ctx->texture_units, CoglTextureUnit, index_);
+  return &g_array_index (glctx->texture_units, CoglTextureUnit, index_);
 }
 
 void
 _cogl_destroy_texture_units (CoglContext *ctx)
 {
   int i;
+  CoglGLContext *glctx = _cogl_driver_gl_context(ctx);
 
-  for (i = 0; i < ctx->texture_units->len; i++)
+  for (i = 0; i < glctx->texture_units->len; i++)
     {
       CoglTextureUnit *unit =
-        &g_array_index (ctx->texture_units, CoglTextureUnit, i);
+        &g_array_index (glctx->texture_units, CoglTextureUnit, i);
       texture_unit_free (unit);
     }
-  g_array_free (ctx->texture_units, TRUE);
+  g_array_free (glctx->texture_units, TRUE);
 }
 
 void
 _cogl_set_active_texture_unit (int unit_index)
 {
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+  CoglGLContext *glctx = _cogl_driver_gl_context(ctx);
 
-  if (ctx->active_texture_unit != unit_index)
+  if (glctx->active_texture_unit != unit_index)
     {
       GE (ctx, glActiveTexture (GL_TEXTURE0 + unit_index));
-      ctx->active_texture_unit = unit_index;
+      glctx->active_texture_unit = unit_index;
     }
 }
 
@@ -190,11 +194,12 @@ _cogl_delete_gl_texture (GLuint gl_texture)
   int i;
 
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+  CoglGLContext *glctx = _cogl_driver_gl_context(ctx);
 
-  for (i = 0; i < ctx->texture_units->len; i++)
+  for (i = 0; i < glctx->texture_units->len; i++)
     {
       CoglTextureUnit *unit =
-        &g_array_index (ctx->texture_units, CoglTextureUnit, i);
+        &g_array_index (glctx->texture_units, CoglTextureUnit, i);
 
       if (unit->gl_texture == gl_texture)
         {
@@ -218,11 +223,12 @@ _cogl_pipeline_texture_storage_change_notify (CoglTexture *texture)
   int i;
 
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+  CoglGLContext *glctx = _cogl_driver_gl_context(ctx);
 
-  for (i = 0; i < ctx->texture_units->len; i++)
+  for (i = 0; i < glctx->texture_units->len; i++)
     {
       CoglTextureUnit *unit =
-        &g_array_index (ctx->texture_units, CoglTextureUnit, i);
+        &g_array_index (glctx->texture_units, CoglTextureUnit, i);
 
       if (unit->layer &&
           _cogl_pipeline_layer_get_texture (unit->layer) == texture)
@@ -704,11 +710,12 @@ foreach_texture_unit_update_filter_and_wrap_modes (void)
   int i;
 
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+  CoglGLContext *glctx = _cogl_driver_gl_context(ctx);
 
-  for (i = 0; i < ctx->texture_units->len; i++)
+  for (i = 0; i < glctx->texture_units->len; i++)
     {
       CoglTextureUnit *unit =
-        &g_array_index (ctx->texture_units, CoglTextureUnit, i);
+        &g_array_index (glctx->texture_units, CoglTextureUnit, i);
 
       if (unit->layer)
         {
diff --git a/cogl/cogl/driver/gl/cogl-util-gl-private.h b/cogl/cogl/driver/gl/cogl-util-gl-private.h
index fb3f8534cc..0d23da1a86 100644
--- a/cogl/cogl/driver/gl/cogl-util-gl-private.h
+++ b/cogl/cogl/driver/gl/cogl-util-gl-private.h
@@ -76,7 +76,10 @@ _cogl_gl_error_to_string (GLenum error_code);
 
 #endif /* COGL_GL_DEBUG */
 
-typedef struct _CoglGLContext CoglGLContext; /* opaque for the moment */
+typedef struct _CoglGLContext {
+  GArray           *texture_units;
+  int               active_texture_unit;
+} CoglGLContext;
 
 CoglGLContext *
 _cogl_driver_gl_context (CoglContext *context);
diff --git a/cogl/cogl/driver/gl/cogl-util-gl.c b/cogl/cogl/driver/gl/cogl-util-gl.c
index afd6d3a8ad..c49c5289f7 100644
--- a/cogl/cogl/driver/gl/cogl-util-gl.c
+++ b/cogl/cogl/driver/gl/cogl-util-gl.c
@@ -84,12 +84,21 @@ _cogl_driver_gl_context (CoglContext *context)
 gboolean
 _cogl_driver_gl_context_init (CoglContext *context)
 {
-  context->texture_units =
+  CoglGLContext *gl_context;
+
+  if (!context->driver_context)
+    context->driver_context = g_new0 (CoglContext, 1);
+
+  gl_context = _cogl_driver_gl_context (context);
+  if (!gl_context)
+    return FALSE;
+
+  gl_context->texture_units =
     g_array_new (FALSE, FALSE, sizeof (CoglTextureUnit));
 
   /* See cogl-pipeline.c for more details about why we leave texture unit 1
    * active by default... */
-  context->active_texture_unit = 1;
+  gl_context->active_texture_unit = 1;
   GE (context, glActiveTexture (GL_TEXTURE1));
 
   return TRUE;
@@ -99,6 +108,7 @@ void
 _cogl_driver_gl_context_deinit (CoglContext *context)
 {
   _cogl_destroy_texture_units (context);
+  g_free (context->driver_context);
 }
 
 GLenum