From 8152a14a2b19e8b10322bfd59f716c4b4cac6a59 Mon Sep 17 00:00:00 2001
From: Steven Hugg <hugg@fasterlight.com>
Date: Wed, 1 May 2019 22:07:17 -0400
Subject: [PATCH] verilog: ctrl-click to pause on scanline

---
 src/emu.ts              | 32 +++++++++++++++++++++-----------
 src/platform/verilog.ts | 27 ++++++++++++++++++++++++---
 src/ui.ts               |  2 +-
 3 files changed, 46 insertions(+), 15 deletions(-)

diff --git a/src/emu.ts b/src/emu.ts
index 8ac63cd8..a621197b 100644
--- a/src/emu.ts
+++ b/src/emu.ts
@@ -84,7 +84,7 @@ export class RasterVideo {
   arraybuf;
   buf8;
   datau32;
-  vcanvas;
+  vcanvas : JQuery;
   
   paddle_x = 255;
   paddle_y = 255;
@@ -132,17 +132,15 @@ export class RasterVideo {
       this.ctx.putImageData(this.imageData, 0, 0);
   }
 
-  setupMouseEvents(el? : HTMLElement) {
+  setupMouseEvents(el? : HTMLCanvasElement) {
     if (!el) el = this.canvas;
-		$(el).mousemove( (e) => {
-		  // TODO: get coords right
-		  var x = e.pageX - this.vcanvas.offset().left;
-		  var y = e.pageY - this.vcanvas.offset().top;
-      var new_x = Math.floor(x * 255 / this.vcanvas.width() - 20);
-      var new_y = Math.floor(y * 255 / this.vcanvas.height() - 20);
-			this.paddle_x = clamp(0, 255, new_x);
-			this.paddle_y = clamp(0, 255, new_y);
-		});
+    $(el).mousemove( (e) => {
+      var pos = getMousePos(el, e);
+      var new_x = Math.floor(pos.x * 255 / this.canvas.width);
+      var new_y = Math.floor(pos.y * 255 / this.canvas.height);
+      this.paddle_x = clamp(0, 255, new_x);
+      this.paddle_y = clamp(0, 255, new_y);
+    });
   };
 }
 
@@ -548,3 +546,15 @@ export class Toolbar {
   
 }
 
+// https://stackoverflow.com/questions/17130395/real-mouse-position-in-canvas
+export function getMousePos(canvas : HTMLCanvasElement, evt) {
+  var rect = canvas.getBoundingClientRect(), // abs. size of element
+      scaleX = canvas.width / rect.width,    // relationship bitmap vs. element for X
+      scaleY = canvas.height / rect.height;  // relationship bitmap vs. element for Y
+
+  return {
+    x: (evt.clientX - rect.left) * scaleX,   // scale mouse coordinates after they have
+    y: (evt.clientY - rect.top) * scaleY     // been adjusted to be relative to element
+  }
+}
+
diff --git a/src/platform/verilog.ts b/src/platform/verilog.ts
index 1a1db57d..5f339a14 100644
--- a/src/platform/verilog.ts
+++ b/src/platform/verilog.ts
@@ -1,10 +1,11 @@
 "use strict";
 
 import { Platform, BasePlatform } from "../baseplatform";
-import { PLATFORMS, setKeyboardFromMap, AnimationTimer, RasterVideo, Keys, makeKeycodeMap } from "../emu";
+import { PLATFORMS, setKeyboardFromMap, AnimationTimer, RasterVideo, Keys, makeKeycodeMap, getMousePos } from "../emu";
 import { SampleAudio } from "../audio";
 import { safe_extend, clamp } from "../util";
 import { WaveformView, WaveformProvider, WaveformMeta } from "../waveform";
+import { setFrameRateUI } from "../ui";
 
 declare var Split;
 
@@ -352,6 +353,23 @@ var VerilogPlatform = function(mainElement, options) {
     });
     // setup mouse events
     video.setupMouseEvents();
+    // setup mouse click
+    video.vcanvas.click( (e) => {
+      if (!gen) return; // must have created emulator
+      if (!e.ctrlKey) {
+        setFrameRateUI(60);
+        return; // ctrl key must be down
+      }
+      setFrameRateUI(1.0/2048);
+      var pos = getMousePos(video.canvas, e);
+      var new_y = Math.floor(pos.y);
+      var clock = 0;
+      while (framey != new_y || clock++ > 200000) {
+        this.setGenInputs();
+        this.updateVideoFrameCycles(1, true, false);
+        gen.__unreset();
+      }
+    });
   }
   
   resize() {
@@ -371,15 +389,18 @@ var VerilogPlatform = function(mainElement, options) {
     this.setGenInputs();
     var fps = this.getFrameRate();
     // darken the previous frame?
-    if (fps < 45) {
+    var sync = fps > 45;
+    if (!sync) {
       var mask = fps > 5 ? 0xe7ffffff : 0x7fdddddd;
       for (var i=0; i<idata.length; i++)
         idata[i] &= mask;
     }
     // paint into frame, synched with vsync if full speed
-    var sync = fps > 45;
     var trace = this.isScopeVisible();
     this.updateVideoFrameCycles(cyclesPerFrame * fps/60 + 1, sync, trace);
+    if (fps < 0.25) {
+      idata[frameidx] = -1;
+    }
     //this.restartDebugState();
     gen.__unreset();
     this.refreshVideoFrame();
diff --git a/src/ui.ts b/src/ui.ts
index dbd1b3b3..8f415527 100644
--- a/src/ui.ts
+++ b/src/ui.ts
@@ -951,7 +951,7 @@ function _recordVideo() {
  //TODO? return true;
 }
 
-function setFrameRateUI(fps:number) {
+export function setFrameRateUI(fps:number) {
   platform.setFrameRate(fps);
   if (fps > 0.01)
     $("#fps_label").text(fps.toFixed(2));