gl-renderer: log shader deletions too

This is useful for seeing that the shader program garbage collection
works in a future patch.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

libweston/renderer-gl/gl-renderer-internal.h

@@ -197,7 +197,7 @@ int
 gl_renderer_setup_egl_extensions(struct weston_compositor *ec);
 
 void
-gl_shader_destroy(struct gl_shader *shader);
+gl_shader_destroy(struct gl_renderer *gr, struct gl_shader *shader);
 
 struct gl_shader *
 gl_shader_create(struct gl_renderer *gr,

libweston/renderer-gl/gl-renderer.c

@@ -3513,10 +3513,10 @@ gl_renderer_destroy(struct weston_compositor *ec)
 		gr->unbind_display(gr->egl_display, ec->wl_display);
 
 	wl_list_for_each_safe(shader, next_shader, &gr->shader_list, link)
-		gl_shader_destroy(shader);
+		gl_shader_destroy(gr, shader);
 
 	if (gr->fallback_shader)
-		gl_shader_destroy(gr->fallback_shader);
+		gl_shader_destroy(gr, gr->fallback_shader);
 
 	/* Work around crash in egl_dri2.c's dri2_make_current() - when does this apply? */
 	eglMakeCurrent(gr->egl_display,

libweston/renderer-gl/gl-shaders.c

@@ -106,14 +106,6 @@ dump_program_with_line_numbers(int count, const char **sources)
 	free(dumpstr);
 }
 
-void
-gl_shader_destroy(struct gl_shader *shader)
-{
-	glDeleteProgram(shader->program);
-	wl_list_remove(&shader->link);
-	free(shader);
-}
-
 static GLuint
 compile_shader(GLenum type, int count, const char **sources)
 {
@@ -257,6 +249,24 @@ error_vertex:
 	return NULL;
 }
 
+void
+gl_shader_destroy(struct gl_renderer *gr, struct gl_shader *shader)
+{
+	char *desc;
+
+	if (weston_log_scope_is_enabled(gr->shader_scope)) {
+		desc = create_shader_description_string(&shader->key);
+		weston_log_scope_printf(gr->shader_scope,
+					"Deleting shader program for: %s\n",
+					desc);
+		free(desc);
+	}
+
+	glDeleteProgram(shader->program);
+	wl_list_remove(&shader->link);
+	free(shader);
+}
+
 int
 gl_shader_requirements_cmp(const struct gl_shader_requirements *a,
 			   const struct gl_shader_requirements *b)