simplified cursor rendering

gui/gui.go

@@ -5,7 +5,7 @@ import (
 	"runtime"
 	"time"
 
-	"github.com/liamg/glfont"
+	"gitlab.com/liamg/raft/glfont"
 
 	"github.com/go-gl/gl/all-core/gl"
 	"github.com/go-gl/glfw/v3.2/glfw"
@@ -16,30 +16,28 @@ import (
 )
 
 type GUI struct {
-	window      *glfw.Window
-	logger      *zap.SugaredLogger
-	config      *config.Config
-	terminal    *terminal.Terminal
-	width       int //window width in pixels
-	height      int //window height in pixels
-	font        *glfont.Font
-	fontScale   int32
-	renderer    Renderer
-	colourAttr  uint32
-	renderState *RenderState
+	window     *glfw.Window
+	logger     *zap.SugaredLogger
+	config     *config.Config
+	terminal   *terminal.Terminal
+	width      int //window width in pixels
+	height     int //window height in pixels
+	font       *glfont.Font
+	fontScale  int32
+	renderer   Renderer
+	colourAttr uint32
 }
 
 func New(config *config.Config, terminal *terminal.Terminal, logger *zap.SugaredLogger) *GUI {
 
 	//logger.
 	return &GUI{
-		config:      config,
-		logger:      logger,
-		width:       600,
-		height:      300,
-		terminal:    terminal,
-		fontScale:   15.0,
-		renderState: NewRenderState(),
+		config:    config,
+		logger:    logger,
+		width:     600,
+		height:    300,
+		terminal:  terminal,
+		fontScale: 15.0,
 	}
 }
 
@@ -73,9 +71,6 @@ func (gui *GUI) resize(w *glfw.Window, width int, height int) {
 		gui.logger.Errorf("Failed to resize terminal to %d cols, %d rows: %s", cols, rows, err)
 	}
 
-	gui.logger.Debugf("Resetting render state...")
-	gui.renderState.Reset()
-
 	gui.logger.Debugf("Setting viewport size...")
 	gl.Viewport(0, 0, int32(gui.width), int32(gui.height))
 
@@ -192,9 +187,6 @@ func (gui *GUI) Render() error {
 
 	defaultCell := buffer.NewBackgroundCell(gui.config.ColourScheme.Background)
 
-	var lastCursorX uint
-	var lastCursorY uint
-
 	for !gui.window.ShouldClose() {
 
 		dirty := false
@@ -210,29 +202,16 @@ func (gui *GUI) Render() error {
 		default:
 		}
 
-		gl.UseProgram(program)
-
 		if dirty || gui.terminal.CheckDirty() {
 
+			gl.UseProgram(program)
 			gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT)
 
-			if gui.terminal.Modes().ShowCursor {
-				cx := uint(gui.terminal.GetLogicalCursorX())
-				cy := uint(gui.terminal.GetLogicalCursorY())
-				cy = cy + uint(gui.terminal.GetScrollOffset())
-
-				if lastCursorX != cx || lastCursorY != cy {
-					gui.renderState.SetDirty(lastCursorX, lastCursorY)
-					dirty = true
-				}
-			}
-
 			lines := gui.terminal.GetVisibleLines()
 			lineCount := gui.terminal.ActiveBuffer().ViewHeight()
 			colCount := gui.terminal.ActiveBuffer().ViewWidth()
-			for y := 0; y < int(lineCount); y++ {
-
-				for x := 0; x < int(colCount); x++ {
+			for x := 0; x < int(colCount); x++ {
+				for y := 0; y < int(lineCount); y++ {
 
 					cell := defaultCell
 
@@ -246,7 +225,27 @@ func (gui *GUI) Render() error {
 						}
 					}
 
-					gui.renderer.DrawCell(cell, uint(x), uint(y))
+					gui.renderer.DrawCellBg(cell, uint(x), uint(y))
+
+				}
+			}
+
+			for x := 0; x < int(colCount); x++ {
+				for y := 0; y < int(lineCount); y++ {
+
+					cell := defaultCell
+
+					if y < len(lines) {
+						cells := lines[y].Cells()
+						if x < len(cells) {
+							cell = cells[x]
+							if cell.Rune() == 0 {
+								cell = defaultCell
+							}
+						}
+					}
+
+					gui.renderer.DrawCellText(cell, uint(x), uint(y))
 
 				}
 			}

gui/renderer.go

@@ -5,14 +5,15 @@ import (
 	"math"
 
 	"github.com/go-gl/gl/all-core/gl"
-	"github.com/liamg/glfont"
 	"gitlab.com/liamg/raft/buffer"
 	"gitlab.com/liamg/raft/config"
+	"gitlab.com/liamg/raft/glfont"
 )
 
 type Renderer interface {
 	SetArea(areaX int, areaY int, areaWidth int, areaHeight int)
-	DrawCell(cell buffer.Cell, col uint, row uint)
+	DrawCellBg(cell buffer.Cell, col uint, row uint)
+	DrawCellText(cell buffer.Cell, col uint, row uint)
 	DrawCursor(col uint, row uint, colour config.Colour)
 	GetTermSize() (uint, uint)
 }
@@ -89,6 +90,12 @@ func (r *OpenGLRenderer) newRectangle(x float32, y float32, colourAttr uint32) *
 	return rect
 }
 
+func (rect *rectangle) Draw() {
+	gl.UseProgram(rect.prog)
+	gl.BindVertexArray(rect.vao)
+	gl.DrawArrays(gl.TRIANGLES, 0, 6)
+}
+
 func (rect *rectangle) setColour(colour [3]float32) {
 	if rect.colour == colour {
 		return
@@ -199,55 +206,44 @@ func (r *OpenGLRenderer) generateRectangle(col uint, line uint) *rectangle {
 }
 
 func (r *OpenGLRenderer) DrawCursor(col uint, row uint, colour config.Colour) {
-
-	rect, ok := r.rectangles[[2]uint{col, row}]
-	if !ok { // probably trying to draw during resize - perhaps add a mutex?
-		return
-	}
-
-	solid := true
-
-	mode := uint32(gl.LINE_LOOP) // gl.TRIANGES for solid cursor
-	points := int32(4)
-
-	if solid {
-		mode = gl.TRIANGLES
-		points = 6
-	}
-
-	gl.UseProgram(r.program)
+	rect := r.getRectangle(col, row)
 	rect.setColour(colour)
-	gl.BindVertexArray(rect.vao)
-	//gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
-	gl.DrawArrays(mode, 0, points)
-	//gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
+	rect.Draw()
 }
 
-func (r *OpenGLRenderer) DrawCell(cell buffer.Cell, col uint, row uint) {
+func (r *OpenGLRenderer) DrawCellBg(cell buffer.Cell, col uint, row uint) {
 
-	var fg [3]float32
 	var bg [3]float32
 
 	if cell.Attr().Reverse {
-		fg = cell.Bg()
 		bg = cell.Fg()
 	} else {
-		fg = cell.Fg()
 		bg = cell.Bg()
 	}
 
+	if bg != r.config.ColourScheme.Background {
+		rect := r.getRectangle(col, row)
+		rect.setColour(bg)
+		rect.Draw()
+	}
+
+}
+
+func (r *OpenGLRenderer) DrawCellText(cell buffer.Cell, col uint, row uint) {
+
+	var fg [3]float32
+
+	if cell.Attr().Reverse {
+		fg = cell.Bg()
+	} else {
+		fg = cell.Fg()
+	}
+
 	pos, ok := r.cellPositions[[2]uint{col, row}]
 	if !ok {
 		panic(fmt.Sprintf("Missing position data for cell at %d,%d", col, row))
 	}
 
-	rect := r.getRectangle(col, row)
-	rect.setColour(bg)
-
-	gl.UseProgram(r.program)
-	gl.BindVertexArray(rect.vao)
-	gl.DrawArrays(gl.TRIANGLES, 0, 6)
-
 	var alpha float32 = 1
 	if cell.Attr().Dim {
 		alpha = 0.5

gui/renderstate.go

@@ -1,58 +0,0 @@
-package gui
-
-type RenderState struct {
-	cells map[[2]uint]RenderedCell
-}
-
-func NewRenderState() *RenderState {
-	return &RenderState{
-		cells: map[[2]uint]RenderedCell{},
-	}
-}
-
-type RenderedCell struct {
-	bg       [3]float32
-	fg       [3]float32
-	contents rune
-	dirty    bool
-}
-
-func (rs *RenderState) Reset() {
-	rs.cells = map[[2]uint]RenderedCell{}
-}
-
-func (rs *RenderState) SetDirty(x uint, y uint) {
-	rs.cells[[2]uint{x, y}] = RenderedCell{
-		bg:       [3]float32{0, 0, 0},
-		fg:       [3]float32{0, 0, 0},
-		contents: 0,
-		dirty:    true,
-	}
-}
-
-func (rs *RenderState) RequiresRender(x uint, y uint, bg [3]float32, fg [3]float32, contents rune, empty bool) bool {
-
-	state, found := rs.cells[[2]uint{x, y}]
-	if !found {
-		if empty {
-			//return false
-		}
-		rs.cells[[2]uint{x, y}] = RenderedCell{
-			bg:       bg,
-			fg:       fg,
-			contents: contents,
-		}
-		return true
-	}
-
-	if state.bg != bg || state.fg != fg || state.contents != contents || state.dirty {
-		rs.cells[[2]uint{x, y}] = RenderedCell{
-			bg:       bg,
-			fg:       fg,
-			contents: contents,
-		}
-		return true
-	}
-
-	return false
-}