renderer: use texture storage APIs if available.

The resources we create for gallium resources should be immutable
wrt the layout we want, so if we have the texture storage APIs
available we should use those instead of the tex image ones to
create the initial storage.

This is also a necessary precursor for texture view support.

Reviewed-by: Jakob Bornecrantz <jakob@collabora.com>
Tested-by: Jakob Bornecrantz <jakob@collabora.com>
Signed-off-by: Jakob Bornecrantz <jakob@collabora.com>

src/vrend_renderer.c

@@ -118,6 +118,7 @@ struct global_renderer_state {
    bool have_sample_shading;
    bool have_texture_buffer_range;
    bool have_polygon_offset_clamp;
+   bool have_texture_storage;
 
    /* these appeared broken on at least one driver */
    bool use_explicit_locations;
@@ -4259,6 +4260,9 @@ int vrend_renderer_init(struct vrend_if_cbs *cbs, uint32_t flags)
    if (gl_ver >= 43 || epoxy_has_gl_extension("GL_ARB_texture_buffer_range"))
       vrend_state.have_texture_buffer_range = true;
 
+   if (gl_ver >= 42 || epoxy_has_gl_extension("GL_ARB_texture_storage"))
+      vrend_state.have_texture_storage = true;
+
    if (gl_ver >= 46 || epoxy_has_gl_extension("GL_ARB_polygon_offset_clamp"))
       vrend_state.have_polygon_offset_clamp = true;
 
@@ -4697,7 +4701,7 @@ int vrend_renderer_resource_create(struct vrend_renderer_resource_create_args *a
       }
 
       if (args->nr_samples > 1) {
-         if (vrend_state.use_gles) {
+         if (vrend_state.use_gles || vrend_state.have_texture_storage) {
             if (gr->target == GL_TEXTURE_2D_MULTISAMPLE) {
                glTexStorage2DMultisample(gr->target, args->nr_samples,
                                        internalformat, args->width, args->height,
@@ -4721,18 +4725,27 @@ int vrend_renderer_resource_create(struct vrend_renderer_resource_create_args *a
 
       } else if (gr->target == GL_TEXTURE_CUBE_MAP) {
          int i;
+	 if (vrend_state.have_texture_storage)
+	    glTexStorage2D(GL_TEXTURE_CUBE_MAP, args->last_level + 1, internalformat, args->width, args->height);
+	 else {
 	    for (i = 0; i < 6; i++) {
 	       GLenum ctarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X + i;
 	       for (level = 0; level <= args->last_level; level++) {
 		  unsigned mwidth = u_minify(args->width, level);
 		  unsigned mheight = u_minify(args->height, level);
+
 		  glTexImage2D(ctarget, level, internalformat, mwidth, mheight, 0, glformat,
 			       gltype, NULL);
 	       }
 	    }
+	 }
       } else if (gr->target == GL_TEXTURE_3D ||
                  gr->target == GL_TEXTURE_2D_ARRAY ||
                  gr->target == GL_TEXTURE_CUBE_MAP_ARRAY) {
+	 if (vrend_state.have_texture_storage) {
+	    unsigned depth_param = (gr->target == GL_TEXTURE_2D_ARRAY || gr->target == GL_TEXTURE_CUBE_MAP_ARRAY) ? args->array_size : args->depth;
+	    glTexStorage3D(gr->target, args->last_level + 1, internalformat, args->width, args->height, depth_param);
+	 } else {
 	    for (level = 0; level <= args->last_level; level++) {
 	       unsigned depth_param = (gr->target == GL_TEXTURE_2D_ARRAY || gr->target == GL_TEXTURE_CUBE_MAP_ARRAY) ? args->array_size : u_minify(args->depth, level);
 	       unsigned mwidth = u_minify(args->width, level);
@@ -4741,16 +4754,25 @@ int vrend_renderer_resource_create(struct vrend_renderer_resource_create_args *a
 			    glformat,
 			    gltype, NULL);
 	    }
+	 }
       } else if (gr->target == GL_TEXTURE_1D && vrend_state.use_gles) {
          report_gles_missing_func(NULL, "glTexImage1D");
       } else if (gr->target == GL_TEXTURE_1D) {
+	 if (vrend_state.have_texture_storage) {
+	    glTexStorage1D(gr->target, args->last_level + 1, internalformat, args->width);
+	 } else {
 	    for (level = 0; level <= args->last_level; level++) {
 	       unsigned mwidth = u_minify(args->width, level);
 	       glTexImage1D(gr->target, level, internalformat, mwidth, 0,
 			    glformat,
 			    gltype, NULL);
 	    }
+	 }
       } else {
+	 if (vrend_state.have_texture_storage)
+	    glTexStorage2D(gr->target, args->last_level + 1, internalformat, args->width,
+			   gr->target == GL_TEXTURE_1D_ARRAY ? args->array_size : args->height);
+	 else {
 	    for (level = 0; level <= args->last_level; level++) {
 	       unsigned mwidth = u_minify(args->width, level);
 	       unsigned mheight = u_minify(args->height, level);
@@ -4758,6 +4780,7 @@ int vrend_renderer_resource_create(struct vrend_renderer_resource_create_args *a
 			    gltype, NULL);
 	    }
 	 }
+      }
 
       gt->state.max_lod = -1;
       gt->cur_swizzle_r = gt->cur_swizzle_g = gt->cur_swizzle_b = gt->cur_swizzle_a = -1;