support for retina displays

glfont/font.go

@@ -2,16 +2,14 @@ package glfont
 
 import (
 	"fmt"
-	"image"
-	"image/draw"
-	"io"
-	"math"
-
 	"github.com/go-gl/gl/all-core/gl"
 	"github.com/golang/freetype"
 	"github.com/golang/freetype/truetype"
 	"golang.org/x/image/font"
 	"golang.org/x/image/math/fixed"
+	"image"
+	"image/draw"
+	"io"
 )
 
 const DPI = 72
@@ -83,9 +81,6 @@ func (f *Font) LinePadding() float32 {
 //Printf draws a string to the screen, takes a list of arguments like printf
 func (f *Font) Print(x, y float32, text string) error {
 
-	x = float32(math.Round(float64(x)))
-	y = float32(math.Round(float64(y)))
-
 	indices := []rune(text)
 
 	if len(indices) == 0 {

gui/fonts.go

@@ -10,12 +10,12 @@ import (
 
 func (gui *GUI) getPackedFont(name string) (*glfont.Font, error) {
 	box := packr.NewBox("./packed-fonts")
-	fontBytes, err := box.MustBytes(name)
+	fontBytes, err := box.Find(name)
 	if err != nil {
 		return nil, fmt.Errorf("packaged font '%s' could not be read: %s", name, err)
 	}
 
-	font, err := glfont.LoadFont(bytes.NewReader(fontBytes), gui.fontScale, gui.width, gui.height)
+	font, err := glfont.LoadFont(bytes.NewReader(fontBytes), gui.fontScale/gui.scale(), gui.width, gui.height)
 	if err != nil {
 		return nil, fmt.Errorf("font '%s' failed to load: %v", name, err)
 	}
@@ -37,7 +37,13 @@ func (gui *GUI) loadFonts() error {
 		return err
 	}
 
-	gui.fontMap = NewFontMap(defaultFont, boldFont)
+	if gui.fontMap == nil {
+		gui.fontMap = NewFontMap(defaultFont, boldFont)
+	}else{
+		gui.fontMap.defaultFont = defaultFont
+		gui.fontMap.defaultBoldFont = boldFont
+	}
+
 
 	// add special non-ascii fonts here
 

gui/gui.go

@@ -55,6 +55,12 @@ func New(config *config.Config, terminal *terminal.Terminal, logger *zap.Sugared
 
 // inspired by https://kylewbanks.com/blog/tutorial-opengl-with-golang-part-1-hello-opengl
 
+func (gui *GUI) scale() float32{
+	pw, _ := gui.window.GetFramebufferSize()
+	ww, _ := gui.window.GetSize()
+	return float32(ww) / float32(pw)
+}
+
 // can only be called on OS thread
 func (gui *GUI) resize(w *glfw.Window, width int, height int) {
 
@@ -63,16 +69,11 @@ func (gui *GUI) resize(w *glfw.Window, width int, height int) {
 	gui.width = width
 	gui.height = height
 
-	ww, wh := w.GetSize()
-
-	hScale := float32(ww) / float32(width)
-	vScale := float32(wh) / float32(height)
-
 	gui.logger.Debugf("Updating font resolutions...")
-	gui.fontMap.UpdateResolution(int(float32(width)*hScale), int(float32(height)*vScale))
+	gui.loadFonts()
 
 	gui.logger.Debugf("Setting renderer area...")
-	gui.renderer.SetArea(0, 0, int(float32(width)*hScale), int(float32(height)*vScale))
+	gui.renderer.SetArea(0, 0, width, height)
 
 	gui.logger.Debugf("Calculating size in cols/rows...")
 	cols, rows := gui.renderer.GetTermSize()