Begin work for multiviewport support on Linux

engine/gfx/vulkan/src/gfx_vulkan.cpp

@@ -284,8 +284,11 @@ GFXBuffer* GFXVulkan::create_buffer(void *data, const GFXSize size, const bool d
 void GFXVulkan::copy_buffer(GFXBuffer* buffer, void* data, GFXSize offset, GFXSize size) {
 	GFXVulkanBuffer* vulkanBuffer = (GFXVulkanBuffer*)buffer;
 
-	void* mapped_data;
+	void* mapped_data = nullptr;
 	vkMapMemory(device, vulkanBuffer->memory, offset, vulkanBuffer->size - offset, 0, &mapped_data);
+    if(mapped_data == nullptr)
+        return;
+    
 	memcpy(mapped_data, data, size);
     
     VkMappedMemoryRange range = {};

platforms/linux/CMakeLists.txt

@@ -7,6 +7,7 @@ add_platform(
     LINK_LIBRARIES
     X11
     xcb
+    xcb-randr
     Core
     GFXVulkan
     COMPILE_OPTIONS

platforms/linux/main.cpp.in

@@ -10,6 +10,7 @@
 #include <unistd.h>
 #include <X11/Xlib.h>
 #include <xcb/xcb.h>
+#include <xcb/randr.h>
 #include <X11/Xutil.h>
 
 @APP_CLASS@* app = nullptr;
@@ -51,6 +52,9 @@ const char* platform::get_name() {
 }
 
 bool platform::supports_feature(const PlatformFeature feature) {
+    if(feature == PlatformFeature::Windowing)
+        return true;
+    
     return false;
 }
 
@@ -129,9 +133,42 @@ float platform::get_monitor_dpi() {
 }
 
 prism::Rectangle platform::get_monitor_resolution() {
+    // based off of https://stackoverflow.com/a/27141466
+    xcb_flush(connection);
+    
+    xcb_randr_get_screen_resources_cookie_t screenResCookie = {};
+    screenResCookie = xcb_randr_get_screen_resources(connection, screen->root);
+    
+    xcb_randr_get_screen_resources_reply_t* screenResReply = {};
+    screenResReply = xcb_randr_get_screen_resources_reply(connection, screenResCookie, 0);
+    
+    int crtcs_num = xcb_randr_get_screen_resources_crtcs_length(screenResReply);
+    xcb_randr_crtc_t* firstCRTC = xcb_randr_get_screen_resources_crtcs(screenResReply);
+    
+    xcb_randr_get_crtc_info_cookie_t* crtcResCookie = new xcb_randr_get_crtc_info_cookie_t[crtcs_num];
+    for(int i = 0; i < crtcs_num; i++)
+        crtcResCookie[i] = xcb_randr_get_crtc_info(connection, *(firstCRTC+i), 0);
+    
+    xcb_randr_get_crtc_info_reply_t** crtcResReply = new xcb_randr_get_crtc_info_reply_t*[crtcs_num];
+    for(int i = 0; i < crtcs_num; i++)
+        crtcResReply[i] = xcb_randr_get_crtc_info_reply(connection, crtcResCookie[i], 0);
+    
+    for(int i = 0; i < crtcs_num; i++) {
+        // just pick up the first monitor for now
+        if(crtcResReply[i]) {
+            prism::Rectangle rect;
+            rect.extent.width = crtcResReply[i]->width;
+            rect.extent.height = crtcResReply[i]->height;
+            
+            return rect;
+        }
+    }
+    
+    return {};
 }
 
 prism::Rectangle platform::get_monitor_work_area() {
+    return platform::get_monitor_resolution();
 }
 
 prism::Offset platform::get_window_position(const int index) {
@@ -356,6 +393,8 @@ int main(int argc, char* argv[]) {
         engine->update(1.0 / 60.0);
         engine->begin_frame(1.0 / 60.0);
         engine->render(0);
+        
+        engine->end_frame();
     }
 
   return 0;