render/d3d11: adjust allowed frame 'latency' (frames-in-queue) based on number of active windows, to not unnecessarily block if we have two windows to build frames for; demon/linux: sketch out register writing path, ensure reg read/write paths have slots for other architectures

src/demon/linux/demon_core_linux.c

@@ -536,6 +536,17 @@ internal B32
 dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread, void *reg_block)
 {
   B32 result = 0;
+  switch(thread->arch)
+  {
+    case Arch_Null:
+    case Arch_COUNT:{}break;
+    case Arch_x86:
+    case Arch_arm64:
+    case Arch_arm32:
+    {NotImplemented;}break;
+    
+    //- rjf: [x64]
+    case Arch_x64:
     {
       REGS_RegBlockX64 *dst = (REGS_RegBlockX64 *)reg_block;
       pid_t tid = (pid_t)thread->id;
@@ -696,6 +707,29 @@ dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread, void *reg_block)
       }
       
       result = got_debug;
+    }break;
+  }
+  return result;
+}
+
+internal B32
+dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread, void *reg_block)
+{
+  B32 result = 0;
+  switch(thread->arch)
+  {
+    case Arch_Null:
+    case Arch_COUNT:{}break;
+    case Arch_x86:
+    case Arch_arm64:
+    case Arch_arm32:
+    {NotImplemented;}break;
+    
+    //- rjf: [x64]
+    case Arch_x64:
+    {
+      
+    }break;
   }
   return result;
 }
@@ -1226,6 +1260,7 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
         e->kind                = e_kind;
         e->process             = dmn_lnx_handle_from_entity(process);
         e->thread              = dmn_lnx_handle_from_entity(thread);
+        e->instruction_pointer = rip;
       }
       
       //- rjf: WSTOPSIG(status) is SIGSTOP
@@ -1473,7 +1508,13 @@ dmn_thread_read_reg_block(DMN_Handle handle, void *reg_block)
 internal B32
 dmn_thread_write_reg_block(DMN_Handle handle, void *reg_block)
 {
-  return 0;
+  B32 result = 0;
+  DMN_AccessScope
+  {
+    DMN_LNX_Entity *thread = dmn_lnx_entity_from_handle(handle);
+    result = dmn_lnx_thread_write_reg_block(thread, reg_block);
+  }
+  return result;
 }
 
 //- rjf: system process listing

src/demon/linux/demon_core_linux.h

@@ -331,5 +331,6 @@ internal DMN_Handle dmn_lnx_handle_from_entity(DMN_LNX_Entity *entity);
 internal DMN_LNX_Entity *dmn_lnx_entity_from_handle(DMN_Handle handle);
 internal DMN_LNX_Entity *dmn_lnx_thread_from_pid(pid_t pid);
 internal B32 dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread, void *reg_block);
+internal B32 dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread, void *reg_block);
 
 #endif // DEMON_CORE_LINUX_H

src/render/d3d11/render_d3d11.c

@@ -548,6 +548,8 @@ r_window_equip(OS_Handle handle)
     r_d3d11_state->device->lpVtbl->CreateRenderTargetView(r_d3d11_state->device, (ID3D11Resource *)window->framebuffer, &framebuffer_rtv_desc, &window->framebuffer_rtv);
     
     result = r_d3d11_handle_from_window(window);
+    r_d3d11_state->window_count += 1;
+    r_d3d11_state->dxgi_device->lpVtbl->SetMaximumFrameLatency(r_d3d11_state->dxgi_device, Clamp(1, r_d3d11_state->window_count, 16));
   }
   ProfEnd();
   return result;
@@ -571,6 +573,8 @@ r_window_unequip(OS_Handle handle, R_Handle equip_handle)
     window->swapchain->lpVtbl->Release(window->swapchain);
     window->generation += 1;
     SLLStackPush(r_d3d11_state->first_free_window, window);
+    r_d3d11_state->window_count -= 1;
+    r_d3d11_state->dxgi_device->lpVtbl->SetMaximumFrameLatency(r_d3d11_state->dxgi_device, Clamp(1, r_d3d11_state->window_count, 16));
   }
   ProfEnd();
 }

src/render/d3d11/render_d3d11.h

@@ -129,6 +129,7 @@ struct R_D3D11_State
 {
   // rjf: state
   Arena *arena;
+  U64 window_count;
   R_D3D11_Window *first_free_window;
   R_D3D11_Tex2D *first_free_tex2d;
   R_D3D11_Buffer *first_free_buffer;