mesa: Remove unnecessary locking from container objects.

From Chapter 5 'Shared Objects and Multiple Contexts' of
the OpenGL 4.5 spec:

   "Objects which contain references to other objects include
   framebuffer, program pipeline, query, transform feedback,
   and vertex array objects.   Such objects are called container
   objects and are not shared"

For we leave locking in place for framebuffer objects because
the EXT fbo extension allowed sharing.

V2: (Timothy Arceri)
 - rebased and dropped changes to framebuffer objects

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

src/mesa/main/arrayobj.c

@@ -169,7 +169,6 @@ _mesa_delete_vao(struct gl_context *ctx, struct gl_vertex_array_object *obj)
 {
    unbind_array_object_vbos(ctx, obj);
    _mesa_reference_buffer_object(ctx, &obj->IndexBufferObj, NULL);
-   mtx_destroy(&obj->Mutex);
    free(obj->Label);
    free(obj);
 }
@@ -192,11 +191,9 @@ _mesa_reference_vao_(struct gl_context *ctx,
       GLboolean deleteFlag = GL_FALSE;
       struct gl_vertex_array_object *oldObj = *ptr;
 
-      mtx_lock(&oldObj->Mutex);
       assert(oldObj->RefCount > 0);
       oldObj->RefCount--;
       deleteFlag = (oldObj->RefCount == 0);
-      mtx_unlock(&oldObj->Mutex);
 
       if (deleteFlag)
          _mesa_delete_vao(ctx, oldObj);
@@ -207,12 +204,10 @@ _mesa_reference_vao_(struct gl_context *ctx,
 
    if (vao) {
       /* reference new array object */
-      mtx_lock(&vao->Mutex);
       assert(vao->RefCount > 0);
 
       vao->RefCount++;
       *ptr = vao;
-      mtx_unlock(&vao->Mutex);
    }
 }
 
@@ -268,7 +263,6 @@ _mesa_initialize_vao(struct gl_context *ctx,
 
    vao->Name = name;
 
-   mtx_init(&vao->Mutex, mtx_plain);
    vao->RefCount = 1;
 
    /* Init the individual arrays */

src/mesa/main/mtypes.h

@@ -1509,8 +1509,6 @@ struct gl_vertex_array_object
 
    GLchar *Label;       /**< GL_KHR_debug */
 
-   mtx_t Mutex;
-
    /**
     * Does the VAO use ARB semantics or Apple semantics?
     *
@@ -3001,8 +2999,6 @@ struct gl_pipeline_object
 
    GLint RefCount;
 
-   mtx_t Mutex;
-
    GLchar *Label;   /**< GL_KHR_debug */
 
    /**

src/mesa/main/pipelineobj.c

@@ -66,7 +66,6 @@ _mesa_delete_pipeline_object(struct gl_context *ctx,
    }
 
    _mesa_reference_shader_program(ctx, &obj->ActiveProgram, NULL);
-   mtx_destroy(&obj->Mutex);
    free(obj->Label);
    ralloc_free(obj);
 }
@@ -80,7 +79,6 @@ _mesa_new_pipeline_object(struct gl_context *ctx, GLuint name)
    struct gl_pipeline_object *obj = rzalloc(NULL, struct gl_pipeline_object);
    if (obj) {
       obj->Name = name;
-      mtx_init(&obj->Mutex, mtx_plain);
       obj->RefCount = 1;
       obj->Flags = _mesa_get_shader_flags();
       obj->InfoLog = NULL;
@@ -189,11 +187,9 @@ _mesa_reference_pipeline_object_(struct gl_context *ctx,
       GLboolean deleteFlag = GL_FALSE;
       struct gl_pipeline_object *oldObj = *ptr;
 
-      mtx_lock(&oldObj->Mutex);
       assert(oldObj->RefCount > 0);
       oldObj->RefCount--;
       deleteFlag = (oldObj->RefCount == 0);
-      mtx_unlock(&oldObj->Mutex);
 
       if (deleteFlag) {
          _mesa_delete_pipeline_object(ctx, oldObj);
@@ -205,12 +201,10 @@ _mesa_reference_pipeline_object_(struct gl_context *ctx,
 
    if (obj) {
       /* reference new pipeline object */
-      mtx_lock(&obj->Mutex);
       assert(obj->RefCount > 0);
 
       obj->RefCount++;
       *ptr = obj;
-      mtx_unlock(&obj->Mutex);
    }
 }
 

src/mesa/main/shaderapi.c

@@ -138,8 +138,6 @@ _mesa_init_shader_state(struct gl_context *ctx)
 
    /* Extended for ARB_separate_shader_objects */
    ctx->Shader.RefCount = 1;
-   mtx_init(&ctx->Shader.Mutex, mtx_plain);
-
    ctx->TessCtrlProgram.patch_vertices = 3;
    for (i = 0; i < 4; ++i)
       ctx->TessCtrlProgram.patch_default_outer_level[i] = 1.0;
@@ -164,7 +162,6 @@ _mesa_free_shader_state(struct gl_context *ctx)
    _mesa_reference_pipeline_object(ctx, &ctx->_Shader, NULL);
 
    assert(ctx->Shader.RefCount == 1);
-   mtx_destroy(&ctx->Shader.Mutex);
 }