get needed mouse states for UI

src/gfx.h

@@ -60,6 +60,7 @@ typedef struct {
     bool keep_running;
 
     int mouse_x, mouse_y;
+    bool mouse_left_down, mouse_right_down;
 
     // Metal objects
     id<MTLDevice> device;
@@ -73,7 +74,8 @@ typedef struct {
 } _metal_gfx_context;
 #endif
 
-typedef void (*_gfx_frame_func)(int mouse_x, int mouse_y);
+typedef void (*_gfx_frame_func)(int mouse_x, int mouse_y, bool mouse_left_down,
+                                bool mouse_right_down);
 typedef struct {
 #if defined(__APPLE__)
     _metal_gfx_context backend;
@@ -175,6 +177,32 @@ void gfx_update_buffer(gfx_context_t *cx, size_t buffer_index, const void *data,
     return self;
 }
 
+- (void)mouseDown:(NSEvent *)event {
+    if ((unsigned long)event.type == NSEventTypeLeftMouseDown) {
+        _gfx_context.backend.mouse_left_down = true;
+    }
+    if (event.type == NSEventTypeRightMouseUp) {
+        _gfx_context.backend.mouse_right_down = true;
+    }
+
+    [self setNeedsDisplay:YES];
+}
+
+- (void)mouseUp:(NSEvent *)event {
+    if ((unsigned long)event.type == NSEventTypeLeftMouseUp) {
+        _gfx_context.backend.mouse_left_down = false;
+    }
+    if (event.type == NSEventTypeRightMouseDown) {
+        _gfx_context.backend.mouse_right_down = false;
+    }
+
+    [self setNeedsDisplay:YES];
+}
+
+- (void)mouseDragged:(NSEvent *)event {
+    [self setNeedsDisplay:YES];
+}
+
 - (void)mouseMoved:(NSEvent *)event {
     // NSPoint location = NSEvent.mouseLocation;
     NSPoint location = [self convertPoint:[event locationInWindow]
@@ -387,7 +415,8 @@ static void _metal_gfx_present(_metal_gfx_context *cx) {
     _gfx_context.gpu_glyphs.size = 0;
     _gfx_context.gpu_ui_rects.size = 0;
     _gfx_context.frame_func(cx->mouse_x,
-                            _gfx_context.frame_height - cx->mouse_y);
+                            _gfx_context.frame_height - cx->mouse_y,
+                            cx->mouse_left_down, cx->mouse_right_down);
 
     if (_gfx_context.gpu_glyphs.size > 0) {
         gfx_update_buffer(&_gfx_context, 2, _gfx_context.gpu_glyphs.data,
@@ -470,6 +499,9 @@ static void _metal_gfx_present(_metal_gfx_context *cx) {
         }
 
         [encoder endEncoding];
+        // FIXME: `afterMinimumDuration` causes the weird re-size scaling, but I
+        // need to figure why the heck the NSView doesn't get the rendered
+        // contents unless `afterMinimumDuration` is here
         [command_buffer presentDrawable:drawable
                    afterMinimumDuration:1.0 / 144.0];
         [command_buffer commit];

src/main.c

@@ -122,7 +122,8 @@ void render_ui_rect(float position[2], float size[2], float color[4]) {
     gfx_queue_ui_rect(state.gfx_cx, position, size, 0, color);
 }
 
-void ed_frame(int mouse_x, int mouse_y) {
+void ed_frame(int mouse_x, int mouse_y, bool mouse_left_down,
+              bool mouse_right_down) {
     state.ui_cx.frame_elements.data[0].size.computed_size[0] =
         state.gfx_cx->frame_width;
     state.ui_cx.frame_elements.data[0].size.computed_size[1] =
@@ -130,7 +131,7 @@ void ed_frame(int mouse_x, int mouse_y) {
 
     uint8_t buffer[256] = {};
     snprintf(buffer, 256, "Mouse X: %d, Mouse Y: %d, Mouse %s", mouse_x,
-             mouse_y, state.ui_cx.input.mouse_left_down ? "Down" : "Up");
+             mouse_y, mouse_left_down ? "Down" : "Up");
 
     render_ui_rect((float[2]){mouse_x, mouse_y}, (float[2]){32, 32},
                    (float[4]){1, 1, 1, 1});