offscreen-sapp: add render pass labels

sapp/offscreen-sapp.c

@@ -50,15 +50,7 @@ static void init(void) {
         }
     };
 
-    // offscreen pass action: clear to grey
-    state.offscreen.pass.action = (sg_pass_action) {
-        .colors[0] = {
-            .load_action = SG_LOADACTION_CLEAR,
-            .clear_value = { 0.25f, 0.25f, 0.25f, 1.0f }
-        }
-    };
-
-    // create a render pass object with one color and one depth render attachment image
+    // setup a render pass struct with one color and one depth render attachment image
     // NOTE: we need to explicitly set the sample count in the attachment image objects,
     // because the offscreen pass uses a different sample count than the display render pass
     // (the display render pass is multi-sampled, the offscreen pass is not)
@@ -74,11 +66,19 @@ static void init(void) {
     img_desc.pixel_format = SG_PIXELFORMAT_DEPTH;
     img_desc.label = "depth-image";
     sg_image depth_img = sg_make_image(&img_desc);
-    state.offscreen.pass.attachments = sg_make_attachments(&(sg_attachments_desc){
-        .colors[0].image = color_img,
-        .depth_stencil.image = depth_img,
+    state.offscreen.pass = (sg_pass) {
+        .attachments = sg_make_attachments(&(sg_attachments_desc){
+            .colors[0].image = color_img,
+            .depth_stencil.image = depth_img,
+        }),
+        .action = {
+            .colors[0] = {
+                .load_action = SG_LOADACTION_CLEAR,
+                .clear_value = { 0.25f, 0.25f, 0.25f, 1.0f }
+            }
+        },
         .label = "offscreen-pass"
-    });
+    };
 
     // a donut shape which is rendered into the offscreen render target, and
     // a sphere shape which is rendered into the default framebuffer
@@ -215,7 +215,11 @@ static void frame(void) {
     vs_params = (vs_params_t) {
         .mvp = compute_mvp(-state.rx * 0.25f, state.ry * 0.25f, (float)w/(float)h, 2.0f)
     };
-    sg_begin_pass(&(sg_pass){ .action = state.display.pass_action, .swapchain = sglue_swapchain() });
+    sg_begin_pass(&(sg_pass){
+        .action = state.display.pass_action,
+        .swapchain = sglue_swapchain(),
+        .label = "swapchain-pass",
+    });
     sg_apply_pipeline(state.display.pip);
     sg_apply_bindings(&state.display.bind);
     sg_apply_uniforms(SG_SHADERSTAGE_VS, SLOT_vs_params, &SG_RANGE(vs_params));