From 00fa902e1f3a4fa4f71b3b78a50cb2cfcb912dcf Mon Sep 17 00:00:00 2001
From: John Alanbrook <john@pockle.world>
Date: Sun, 15 Sep 2024 12:22:45 -0500
Subject: [PATCH] add support for imgui textures

---
 source/engine/gui.cpp   | 60 ++++++++++++++++++++++++++++++++++++-----
 source/engine/texture.c |  4 +--
 source/engine/texture.h |  9 ++++---
 3 files changed, 61 insertions(+), 12 deletions(-)

diff --git a/source/engine/gui.cpp b/source/engine/gui.cpp
index b02d553..40e3c6a 100644
--- a/source/engine/gui.cpp
+++ b/source/engine/gui.cpp
@@ -159,13 +159,27 @@ JSC_CCALL(imgui_popid, ImGui::PopID(); )
 
 JSC_CCALL(imgui_image,
   texture *tex = js2texture(argv[0]);
-  simgui_image_desc_t simgd;
-  simgd.image = tex->id;
-  simgd.sampler = std_sampler;
-  simgui_image_t simgui_img = simgui_make_image(&simgd);
-  ImTextureID tex_id = simgui_imtextureid(simgui_img);
-  ImGui::Image(tex_id, ImVec2(tex->width, tex->height), ImVec2(0,0), ImVec2(1,1));
-  simgui_destroy_image(simgui_img);
+  if (!tex->simgui.id) {
+    simgui_image_desc_t simgd;
+    simgd.image = tex->id;
+    simgd.sampler = std_sampler;
+    tex->simgui = simgui_make_image(&simgd);
+  }
+  
+  ImGui::Image(simgui_imtextureid(tex->simgui), ImVec2(tex->width, tex->height), ImVec2(0,0), ImVec2(1,1));
+)
+
+JSC_SCALL(imgui_imagebutton,
+  texture *tex = js2texture(argv[1]);
+  if (!tex->simgui.id) {
+    simgui_image_desc_t simgd;
+    simgd.image = tex->id;
+    simgd.sampler = std_sampler;
+    tex->simgui = simgui_make_image(&simgd);
+  }
+  
+  if (ImGui::ImageButton(str, simgui_imtextureid(tex->simgui), ImVec2(tex->width, tex->height)))
+    script_call_sym(argv[2], 1, argv);
 )
 
 JSC_CCALL(imgui_sameline, ImGui::SameLine(js2number(argv[0])) )
@@ -482,10 +496,35 @@ JSC_CCALL(imgui_mousehoveringrect,
   return boolean2js(ImGui::IsMouseHoveringRect(js2imvec2(argv[0]), js2imvec2(argv[1])));
 )
 
+JSC_CCALL(imgui_mouseclicked,
+  return boolean2js(ImGui::IsMouseClicked(js2number(argv[0])));
+)
+
+JSC_CCALL(imgui_mousedown,
+  return boolean2js(ImGui::IsMouseDown(js2number(argv[0])));
+)
+
+JSC_CCALL(imgui_mousereleased,
+  return boolean2js(ImGui::IsMouseReleased(js2number(argv[0])));
+)
+
+JSC_CCALL(imgui_mousedragging,
+  return boolean2js(ImGui::IsMouseDragging(js2number(argv[0])));
+)
+
+JSC_CCALL(imgui_mousedelta,
+  ImVec2 dm = ImGui::GetIO().MouseDelta;
+  return vec22js((HMM_Vec2){dm.x,dm.y});
+)
+
 JSC_CCALL(imgui_dummy,
   ImGui::Dummy(js2imvec2(argv[0]));
 )
 
+JSC_SCALL(imgui_invisiblebutton,
+  ImGui::InvisibleButton(str, js2imvec2(argv[1]));
+)
+
 static const JSCFunctionListEntry js_imgui_funcs[] = {
   MIST_FUNC_DEF(imgui, window, 2),
   MIST_FUNC_DEF(imgui, menu, 2),
@@ -499,6 +538,7 @@ static const JSCFunctionListEntry js_imgui_funcs[] = {
   MIST_FUNC_DEF(imgui, menuitem, 3),
   MIST_FUNC_DEF(imgui, radio, 2),
   MIST_FUNC_DEF(imgui, image, 1),
+  MIST_FUNC_DEF(imgui, imagebutton, 2),
   MIST_FUNC_DEF(imgui, textinput, 2),
   MIST_FUNC_DEF(imgui, textbox, 2),
   MIST_FUNC_DEF(imgui, button, 2),
@@ -536,6 +576,11 @@ static const JSCFunctionListEntry js_imgui_funcs[] = {
   MIST_FUNC_DEF(imgui, tlgroup, 2),
   MIST_FUNC_DEF(imgui, seq, 3),
   MIST_FUNC_DEF(imgui, mousehoveringrect, 2),
+  MIST_FUNC_DEF(imgui, mouseclicked, 1),
+  MIST_FUNC_DEF(imgui, mousedown, 1),
+  MIST_FUNC_DEF(imgui, mousereleased, 1),
+  MIST_FUNC_DEF(imgui, mousedragging, 1),
+  MIST_FUNC_DEF(imgui, mousedelta, 0),
   MIST_FUNC_DEF(imgui, rect, 3),
   MIST_FUNC_DEF(imgui, rectfilled, 3),
   MIST_FUNC_DEF(imgui, line, 3),
@@ -546,6 +591,7 @@ static const JSCFunctionListEntry js_imgui_funcs[] = {
   MIST_FUNC_DEF(imgui, setcursorscreenpos, 1),
   MIST_FUNC_DEF(imgui, contentregionavail, 0),
   MIST_FUNC_DEF(imgui, dummy, 1),
+  MIST_FUNC_DEF(imgui, invisiblebutton, 2),
 };
 
 static int started = 0;
diff --git a/source/engine/texture.c b/source/engine/texture.c
index beb4ec3..818217f 100644
--- a/source/engine/texture.c
+++ b/source/engine/texture.c
@@ -161,8 +161,6 @@ struct texture *texture_from_file(const char *path) {
   
   for (int i = 1; i < mips; i++)
     free(mipdata[i]);
-
-
     
   return tex;
 }
@@ -174,6 +172,8 @@ void texture_free(texture *tex)
     free(tex->data);
   if (tex->delays) arrfree(tex->delays);
   sg_destroy_image(tex->id);
+  if (tex->simgui.id)
+    simgui_destroy_image(tex->simgui);  
   free(tex);
 }
 
diff --git a/source/engine/texture.h b/source/engine/texture.h
index af9e6f6..085d5a8 100644
--- a/source/engine/texture.h
+++ b/source/engine/texture.h
@@ -3,7 +3,10 @@
 
 #include "sokol/sokol_gfx.h"
 #include "HandmadeMath.h"
-#include "render.h"  
+#include "render.h"
+
+#include "sokol_app.h"
+#include "sokol/util/sokol_imgui.h"
 
 #define TEX_SPEC 0
 #define TEX_NORM 1
@@ -18,8 +21,8 @@ extern struct rect ST_UNIT;
 
 /* Represents an actual texture on the GPU */
 struct texture {
-  sg_image id; /* ID reference for the GPU memory location of the 
-  texture */
+  sg_image id; /* ID reference for the GPU memory location of the texture */
+  simgui_image_t simgui;
   int width;
   int height;
   unsigned char *data;