From 707cd4f7e124f5d4f4c29f785d7721ebd596f6da Mon Sep 17 00:00:00 2001
From: soypat <graded.sp@gmail.com>
Date: Sun, 24 Nov 2024 17:52:14 -0300
Subject: [PATCH] add crisp draw to UI

---
 gsdfaux/ui.go | 74 ++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 58 insertions(+), 16 deletions(-)

diff --git a/gsdfaux/ui.go b/gsdfaux/ui.go
index e5e4971..5097659 100644
--- a/gsdfaux/ui.go
+++ b/gsdfaux/ui.go
@@ -67,6 +67,10 @@ void main() {
 		1.0, 1.0,
 	}
 	gl.BufferData(gl.ARRAY_BUFFER, 4*len(vertices), gl.Ptr(vertices), gl.STATIC_DRAW)
+	antialiasingUniform, err := prog.UniformLocation("uAA\x00")
+	if err != nil {
+		return err
+	}
 	charDistUniform, err := prog.UniformLocation("uCharDist\x00")
 	if err != nil {
 		return err
@@ -103,6 +107,7 @@ void main() {
 	minZoom := float64(diag * 0.00001)
 	maxZoom := float64(diag * 10)
 	var (
+		lastEdit         time.Time
 		yaw              float64
 		pitch            float64
 		lastMouseX       float64
@@ -114,12 +119,15 @@ void main() {
 		pitchSensitivity         = 0.005
 		refresh                  = true
 	)
-
+	flagEdit := func() {
+		refresh = true
+		lastEdit = time.Now()
+	}
 	window.SetCursorPosCallback(func(w *glfw.Window, xpos float64, ypos float64) {
 		if !isMousePressed {
 			return
 		}
-		refresh = true
+		flagEdit()
 		if firstMouseMove {
 			lastMouseX = xpos
 			lastMouseY = ypos
@@ -147,7 +155,7 @@ void main() {
 	})
 
 	window.SetScrollCallback(func(w *glfw.Window, xoff, yoff float64) {
-		refresh = true
+		flagEdit()
 		camDist -= yoff * (camDist*.1 + .01)
 		if camDist < minZoom {
 			camDist = minZoom // Minimum zoom level
@@ -160,7 +168,7 @@ void main() {
 	window.SetMouseButtonCallback(func(w *glfw.Window, button glfw.MouseButton, action glfw.Action, mods glfw.ModifierKey) {
 		switch button {
 		case glfw.MouseButtonLeft:
-			refresh = true
+			flagEdit()
 			if action == glfw.Press {
 				isMousePressed = true
 				firstMouseMove = true
@@ -175,14 +183,9 @@ void main() {
 	// Main render loop
 	previousTime := glfw.GetTime()
 	ctx := cfg.Context
-	for !window.ShouldClose() {
-		if ctx != nil {
-			select {
-			case <-ctx.Done():
-				return ctx.Err()
-			default:
-			}
-		}
+
+	draw := func(aa int32) {
+		println("start draw")
 		width, height := window.GetSize()
 		currentTime := glfw.GetTime()
 		elapsedTime := currentTime - previousTime
@@ -200,22 +203,42 @@ void main() {
 		gl.Uniform1f(yawUniform, float32(yaw))
 		gl.Uniform1f(pitchUniform, float32(pitch))
 		gl.Uniform1f(charDistUniform, float32(camDist)+diag)
+		gl.Uniform1i(antialiasingUniform, aa)
 		// Draw the quad
 		gl.BindVertexArray(vao)
 		gl.DrawArrays(gl.TRIANGLES, 0, 6)
 		// Swap buffers and poll events
 		window.SwapBuffers()
+		println("end draw")
+	}
 
-		// Limit frame rate
+	for !window.ShouldClose() {
+		println("window poll")
+		if ctx != nil {
+			println("ads")
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+			}
+		}
+		draw(1)
+
+		crisp := false
 		for {
 			time.Sleep(time.Second / 60)
 			glfw.PollEvents()
 			if refresh || window.ShouldClose() {
 				refresh = false
 				break
+			} else if !isMousePressed && !crisp && time.Since(lastEdit) > 300*time.Millisecond {
+				draw(3) // draw crisp image and stop rendering on end of mouse movement.
+				crisp = true
+				println("crisp")
 			}
 		}
 	}
+	println("exiting")
 	return nil
 }
 
@@ -249,6 +272,7 @@ vec3 calcNormal(vec3 pos) {
 }
 
 uniform float uCamDist; // Distance from the target. Controlled by mouse scroll (zoom).
+uniform int uAA; // Anti aliasing.
 
 void main() {
     vec2 fragCoord = vTexCoord * uResolution;
@@ -281,7 +305,13 @@ void main() {
     vec3 vv = cross(uu, ww);                             // Up vector
 
     // Pixel coordinates
-    vec2 p = (2.0 * fragCoord - uResolution) / uResolution.y;
+	vec3 tot = vec3(0.0); // Total color accumulation.
+
+    for (int m = 0; m < uAA; m++)
+    for (int n = 0; n < uAA; n++)
+	{
+	vec2 o = vec2(float(m), float(n)) / float(uAA) - 0.5;
+	vec2 p = (2.0 * (fragCoord+o) - uResolution) / uResolution.y;
 
     // Create view ray
     vec3 rd = normalize(p.x * uu + p.y * vv + 1.5 * ww);
@@ -309,12 +339,15 @@ void main() {
         float amb = 0.5 + 0.5 * dot(nor, vec3(0.0, 1.0, 0.0));
         col = vec3(0.2, 0.3, 0.4) * amb + vec3(0.8, 0.7, 0.5) * dif;
 		col = sqrt(col);
+		tot += col;
     }
+	}
+	tot /= float(uAA*uAA);
 
     // Gamma correction
     
 
-    fragColor = vec4(col, 1.0);
+    fragColor = vec4(tot, 1.0);
 }
 `)
 	buf.WriteByte(0)
@@ -342,5 +375,14 @@ func startGLFW(width, height int) (window *glfw.Window, term func(), err error)
 	if err := gl.Init(); err != nil {
 		log.Fatalln("Failed to initialize OpenGL:", err)
 	}
-	return window, glfw.Terminate, err
+	term = func() {
+		glfw.Terminate()
+		return
+		println("destroy")
+		window.Destroy()
+		println("terminate")
+
+		println("destroy terminate done")
+	}
+	return window, term, err
 }