Added a crosshair and params for it

src/overlay.cpp

@@ -1135,7 +1135,7 @@ static void compute_swapchain_display(struct swapchain_data *data)
 
    if(displayHud)
 	   ImGui::Begin("Main", &open, ImGuiWindowFlags_NoDecoration);
-
+      
    if(!displayHud){
       ImGui::SetNextWindowBgAlpha(0.01);
       ImGui::Begin("Main", &open, ImGuiWindowFlags_NoDecoration);
@@ -1284,11 +1284,21 @@ static void compute_swapchain_display(struct swapchain_data *data)
       ImGui::Text("Logging...");
       ImGui::Text("Elapsed: %isec", int((elapsedLog) / 1000000));
       ImGui::End();
-   }  
-   ImGui::PopStyleVar(2);
-   ImGui::EndFrame();
-   ImGui::Render();
-
+   }
+   if (instance_data->params.enabled[OVERLAY_PARAM_ENABLED_crosshair]){
+      ImGui::SetNextWindowBgAlpha(0.0);
+      ImGui::SetNextWindowSize(ImVec2(data->width, data->height), ImGuiCond_Always);
+      ImGui::SetNextWindowPos(ImVec2(0, 0), ImGuiCond_Always);
+      ImGui::Begin("Logging", &open, ImGuiWindowFlags_NoDecoration);
+      ImVec2 horiz = ImVec2(data->width / 2 - (instance_data->params.crosshair_size / 2), data->height / 2);
+      ImVec2 vert = ImVec2(data->width / 2, data->height / 2 - (instance_data->params.crosshair_size / 2));
+      ImGui::GetWindowDrawList()->AddLine(horiz, ImVec2(horiz.x + instance_data->params.crosshair_size, horiz.y + 0), IM_COL32(0, 0, 0, 255), 2.0f);
+      ImGui::GetWindowDrawList()->AddLine(vert, ImVec2(vert.x + 0, vert.y + instance_data->params.crosshair_size), IM_COL32(0, 0, 0, 255), 2.0f);
+      ImGui::End();
+   }
+      ImGui::PopStyleVar(2);
+      ImGui::EndFrame();
+      ImGui::Render();
 }
 
 static uint32_t vk_memory_type(struct device_data *data,

src/overlay_params.c

@@ -79,6 +79,12 @@ parse_fps_sampling_period(const char *str)
    return strtol(str, NULL, 0) * 1000;
 }
 
+static uint32_t
+parse_crosshair_size(const char *str)
+{
+   return strtol(str, NULL, 0);
+}
+
 static bool
 parse_no_display(const char *str)
 {
@@ -183,6 +189,7 @@ parse_overlay_env(struct overlay_params *params,
    params->width = 280;
    params->height = 140;
    params->control = -1;
+   params->crosshair_size = 30;
 
    if (!env)
       return;

src/overlay_params.h

@@ -45,6 +45,7 @@ extern "C" {
    OVERLAY_PARAM_BOOL(gpu_stats)                     \
    OVERLAY_PARAM_BOOL(ram)                           \
    OVERLAY_PARAM_BOOL(vram)                          \
+   OVERLAY_PARAM_BOOL(crosshair)                     \
    OVERLAY_PARAM_CUSTOM(fps_sampling_period)         \
    OVERLAY_PARAM_CUSTOM(output_file)                 \
    OVERLAY_PARAM_CUSTOM(position)                    \
@@ -53,6 +54,7 @@ extern "C" {
    OVERLAY_PARAM_CUSTOM(no_display)                  \
    OVERLAY_PARAM_CUSTOM(control)                     \
    OVERLAY_PARAM_CUSTOM(font_size)                   \
+   OVERLAY_PARAM_CUSTOM(crosshair_size)              \
    OVERLAY_PARAM_CUSTOM(help)
 
 enum overlay_param_position {
@@ -77,6 +79,7 @@ struct overlay_params {
    FILE *output_file;
    int control;
    uint32_t fps_sampling_period; /* us */
+   uint32_t crosshair_size;
    bool help;
    bool no_display;
    unsigned width;