Examples: Allegro5: Added support for ImGuiConfigFlags_NoMouseCursorChange flag. Added clipboard support. Unindexing buffers ourselves as Allegro indexed drawing primitives are buggy in the DirectX9 back-end.

CHANGELOG.txt

@@ -82,7 +82,8 @@ Other Changes:
  - Examples: GLFW: Made it possible to Shutdown/Init the backend again (by reseting the time storage properly). (#1827) [@ice1000]
  - Examples: Win32: Fixed handling of mouse wheel messages to support sub-unit scrolling messages (typically sent by track-pads). (#1874) [@zx64]  
  - Examples: Added SDL+Vulkan example.
- - Examples: Allegro5: Added support for ImGuiConfigFlags_NoMouseCursorChange flag.
+ - Examples: Allegro5: Added support for ImGuiConfigFlags_NoMouseCursorChange flag. Added clipboard support. 
+ - Examples: Allegro5: Unindexing buffers ourselves as Allegro indexed drawing primitives are buggy in the DirectX9 back-end.
  - Examples: FreeGLUT: Added FreeGLUT bindings. Added FreeGLUT+OpenGL2 example. (#801)
  - Misc: Updated stb_textedit from 1.09 + patches to 1.12 + minor patches.
  - Internals: PushItemFlag() flags are inherited by BeginChild().

examples/.gitignore

@@ -10,6 +10,7 @@ build/*
 *.o
 *.obj
 *.exe
+*.log
 *.pdb
 *.ilk
 *.VC.db

examples/example_allegro5/README.md

@@ -12,12 +12,12 @@ Note that the back-end supports _BOTH_ 16-bit and 32-bit indices, but 32-bit ind
 - On Ubuntu 14.04+
 
 ```bash
-g++ -DIMGUI_USER_CONFIG=\"examples/example_allegro5/imconfig_allegro5.h\" -I .. -I ../.. main.cpp imgui_impl_allegro5.cpp ../../imgui*.cpp -lallegro -lallegro_primitives -o allegro5_example
+g++ -DIMGUI_USER_CONFIG=\"examples/example_allegro5/imconfig_allegro5.h\" -I .. -I ../.. main.cpp ..\imgui_impl_allegro5.cpp ../../imgui*.cpp -lallegro -lallegro_primitives -o allegro5_example
 ```
 
 - On Windows with Visual Studio's CLI
 
 ```
 set ALLEGRODIR=path_to_your_allegro5_folder
-cl /Zi /MD /I %ALLEGRODIR%\include /DIMGUI_USER_CONFIG=\"examples/example_allegro5/imconfig_allegro5.h\" /I .. /I ..\.. main.cpp imgui_impl_allegro5.cpp ..\..\imgui*.cpp /link /LIBPATH:%ALLEGRODIR%\lib allegro-5.0.10-monolith-md.lib user32.lib
+cl /Zi /MD /I %ALLEGRODIR%\include /DIMGUI_USER_CONFIG=\"examples/example_allegro5/imconfig_allegro5.h\" /I .. /I ..\.. main.cpp ..\imgui_impl_allegro5.cpp ..\..\imgui*.cpp /link /LIBPATH:%ALLEGRODIR%\lib allegro-5.0.10-monolith-md.lib user32.lib
 ```

examples/example_allegro5/example_allegro5.vcxproj

@@ -0,0 +1,173 @@
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+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{2AE17FDE-F7F3-4CAC-ADAB-0710EDA4F741}</ProjectGuid>
+    <RootNamespace>example_allegro5</RootNamespace>
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+      <AdditionalDependencies>opengl32.lib;%(AdditionalDependencies)</AdditionalDependencies>
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+      <IgnoreSpecificDefaultLibraries>
+      </IgnoreSpecificDefaultLibraries>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\imgui.cpp" />
+    <ClCompile Include="..\..\imgui_demo.cpp" />
+    <ClCompile Include="..\..\imgui_draw.cpp" />
+    <ClCompile Include="..\imgui_impl_allegro5.cpp" />
+    <ClCompile Include="imconfig_allegro5.h" />
+    <ClCompile Include="main.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\..\imconfig.h" />
+    <ClInclude Include="..\..\imgui.h" />
+    <ClInclude Include="..\..\imgui_internal.h" />
+    <ClInclude Include="..\imgui_impl_allegro5.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\..\misc\natvis\imgui.natvis" />
+    <None Include="..\README.txt" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

examples/example_allegro5/example_allegro5.vcxproj.filters

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="imgui">
+      <UniqueIdentifier>{20b90ce4-7fcb-4731-b9a0-075f875de82d}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="sources">
+      <UniqueIdentifier>{f18ab499-84e1-499f-8eff-9754361e0e52}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\imgui.cpp">
+      <Filter>imgui</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\imgui_demo.cpp">
+      <Filter>imgui</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\imgui_draw.cpp">
+      <Filter>imgui</Filter>
+    </ClCompile>
+    <ClCompile Include="main.cpp">
+      <Filter>sources</Filter>
+    </ClCompile>
+    <ClCompile Include="..\imgui_impl_allegro5.cpp">
+      <Filter>sources</Filter>
+    </ClCompile>
+    <ClCompile Include="imconfig_allegro5.h">
+      <Filter>sources</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\..\imconfig.h">
+      <Filter>imgui</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\imgui.h">
+      <Filter>imgui</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\imgui_internal.h">
+      <Filter>imgui</Filter>
+    </ClInclude>
+    <ClInclude Include="..\imgui_impl_allegro5.h">
+      <Filter>sources</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\README.txt" />
+    <None Include="..\..\misc\natvis\imgui.natvis">
+      <Filter>sources</Filter>
+    </None>
+  </ItemGroup>
+</Project>

examples/imgui_impl_allegro5.cpp

@@ -3,10 +3,11 @@
 
 // Implemented features:
 //  [X] Renderer: User texture binding. Use 'ALLEGRO_BITMAP*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
+//  [X] Platform: Clipboard support (from Allegro 5.1.12)
 //  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+
 // Issues:
-//  [ ] Renderer: The renderer is suboptimal as we need to convert vertices.
-//  [ ] Platform: Clipboard support via al_set_clipboard_text/al_clipboard_has_text.
+//  [ ] Renderer: The renderer is suboptimal as we need to unindex our buffers and convert the format of vertices.
 
 // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
 // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
@@ -15,6 +16,9 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2018-06-13: Platform: Added clipboard support (from Allegro 5.1.12).
+//  2018-06-13: Renderer: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
+//  2018-06-13: Renderer: Backup/restore transform and clipping rectangle.
 //  2018-06-11: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag.
 //  2018-04-18: Misc: Renamed file from imgui_impl_a5.cpp to imgui_impl_allegro5.cpp.
 //  2018-04-18: Misc: Added support for 32-bits vertex indices to avoid conversion at runtime. Added imconfig_allegro5.h to enforce 32-bit indices when included from imgui.h.
@@ -26,12 +30,19 @@
 #include <cstring>      // memcpy
 #include "imgui.h"
 #include "imgui_impl_allegro5.h"
+
+// Allegro
 #include <allegro5/allegro.h>
 #include <allegro5/allegro_primitives.h>
-
 #ifdef _WIN32
 #include <allegro5/allegro_windows.h>
 #endif
+#define ALLEGRO_HAS_CLIPBOARD   (ALLEGRO_VERSION_INT >= ((5 << 24) | (1 << 16) | (12 << 8)))    // Clipboard only supported from Allegro 5.1.12
+
+// Visual Studio warnings
+#ifdef _MSC_VER
+#pragma warning (disable: 4127) // condition expression is constant
+#endif
 
 // Data
 static ALLEGRO_DISPLAY*         g_Display = NULL;
@@ -39,6 +50,7 @@ static ALLEGRO_BITMAP*          g_Texture = NULL;
 static double                   g_Time = 0.0;
 static ALLEGRO_MOUSE_CURSOR*    g_MouseCursorInvisible = NULL;
 static ALLEGRO_VERTEX_DECL*     g_VertexDecl = NULL;
+static char*                    g_ClipboardTextData = NULL;
 
 struct ImDrawVertAllegro
 {
@@ -51,26 +63,47 @@ struct ImDrawVertAllegro
 // (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
 void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
 {
-    int op, src, dst;
-    al_get_blender(&op, &src, &dst);
+    // Backup Allegro state that will be modified
+    ALLEGRO_TRANSFORM last_transform = *al_get_current_transform();
+    ALLEGRO_TRANSFORM last_projection_transform = *al_get_current_projection_transform();
+    int last_clip_x, last_clip_y, last_clip_w, last_clip_h;
+    al_get_clipping_rectangle(&last_clip_x, &last_clip_y, &last_clip_w, &last_clip_h);
+    int last_blender_op, last_blender_src, last_blender_dst;
+    al_get_blender(&last_blender_op, &last_blender_src, &last_blender_dst);
+
+    // Setup render state
     al_set_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA);
 
+    // Setup orthographic projection matrix
+    // Our visible imgui space lies from draw_data->DisplayPps (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right).
+    {
+        float L = draw_data->DisplayPos.x;
+        float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
+        float T = draw_data->DisplayPos.y;
+        float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
+        ALLEGRO_TRANSFORM transform;
+        al_identity_transform(&transform);
+        al_use_transform(&transform);
+        al_orthographic_transform(&transform, L, T, 1.0f, R, B, -1.0f);
+        al_use_projection_transform(&transform);
+    }
+
     for (int n = 0; n < draw_data->CmdListsCount; n++)
     {
         const ImDrawList* cmd_list = draw_data->CmdLists[n];
 
-        // FIXME-OPT: Unfortunately Allegro doesn't support 32-bits packed colors so we have to convert them to 4 floats
+        // Allegro's implementation of al_draw_indexed_prim() for DX9 is completely broken. Unindex our buffers ourselves.
+        // FIXME-OPT: Unfortunately Allegro doesn't support 32-bits packed colors so we have to convert them to 4 float as well..
         static ImVector<ImDrawVertAllegro> vertices;
-        vertices.resize(cmd_list->VtxBuffer.Size);
-        for (int i = 0; i < cmd_list->VtxBuffer.Size; ++i)
+        vertices.resize(cmd_list->IdxBuffer.Size);
+        for (int i = 0; i < cmd_list->IdxBuffer.Size; i++)
         {
-            const ImDrawVert &dv = cmd_list->VtxBuffer[i];
-            ImDrawVertAllegro v;
-            v.pos = dv.pos;
-            v.uv = dv.uv;
-            unsigned char *c = (unsigned char*)&dv.col;
-            v.col = al_map_rgba(c[0], c[1], c[2], c[3]);
-            vertices[i] = v;
+            const ImDrawVert* src_v = &cmd_list->VtxBuffer[cmd_list->IdxBuffer[i]];
+            ImDrawVertAllegro* dst_v = &vertices[i];
+            dst_v->pos = src_v->pos;
+            dst_v->uv = src_v->uv;
+            unsigned char* c = (unsigned char*)&src_v->col;
+            dst_v->col = al_map_rgba(c[0], c[1], c[2], c[3]);
         }
 
         const int* indices = NULL;
@@ -90,6 +123,7 @@ void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
         }
 
         int idx_offset = 0;
+        ImVec2 pos = draw_data->DisplayPos;
         for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
         {
             const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
@@ -100,16 +134,18 @@ void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
             else
             {
                 ALLEGRO_BITMAP* texture = (ALLEGRO_BITMAP*)pcmd->TextureId;
-                al_set_clipping_rectangle(pcmd->ClipRect.x, pcmd->ClipRect.y, pcmd->ClipRect.z-pcmd->ClipRect.x, pcmd->ClipRect.w-pcmd->ClipRect.y);
-                al_draw_indexed_prim(&vertices[0], g_VertexDecl, texture, &indices[idx_offset], pcmd->ElemCount, ALLEGRO_PRIM_TRIANGLE_LIST);
+                al_set_clipping_rectangle(pcmd->ClipRect.x - pos.x, pcmd->ClipRect.y - pos.y, pcmd->ClipRect.z - pcmd->ClipRect.x, pcmd->ClipRect.w - pcmd->ClipRect.y);
+                al_draw_prim(&vertices[0], g_VertexDecl, texture, idx_offset, idx_offset + pcmd->ElemCount, ALLEGRO_PRIM_TRIANGLE_LIST);
             }
             idx_offset += pcmd->ElemCount;
         }
     }
 
-    // Restore modified state
-    al_set_blender(op, src, dst);
-    al_set_clipping_rectangle(0, 0, al_get_display_width(g_Display), al_get_display_height(g_Display));
+    // Restore modified Allegro state
+    al_set_blender(last_blender_op, last_blender_src, last_blender_dst);
+    al_set_clipping_rectangle(last_clip_x, last_clip_y, last_clip_w, last_clip_h);
+    al_use_transform(&last_transform);
+    al_use_projection_transform(&last_projection_transform);
 }
 
 bool ImGui_ImplAllegro5_CreateDeviceObjects()
@@ -174,6 +210,21 @@ void ImGui_ImplAllegro5_InvalidateDeviceObjects()
     }
 }
 
+#if ALLEGRO_HAS_CLIPBOARD
+static const char* ImGui_ImplAllegro5_GetClipboardText(void*)
+{
+    if (g_ClipboardTextData)
+        al_free(g_ClipboardTextData);
+    g_ClipboardTextData = al_get_clipboard_text(g_Display);
+    return g_ClipboardTextData;
+}
+
+static void ImGui_ImplAllegro5_SetClipboardText(void*, const char* text)
+{
+    al_set_clipboard_text(g_Display, text);
+}
+#endif
+
 bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
 {
     g_Display = display;
@@ -216,12 +267,24 @@ bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
     io.KeyMap[ImGuiKey_Y] = ALLEGRO_KEY_Y;
     io.KeyMap[ImGuiKey_Z] = ALLEGRO_KEY_Z;
 
+#if ALLEGRO_HAS_CLIPBOARD
+    io.SetClipboardTextFn = ImGui_ImplAllegro5_SetClipboardText;
+    io.GetClipboardTextFn = ImGui_ImplAllegro5_GetClipboardText;
+    io.ClipboardUserData = NULL;
+#endif
+
     return true;
 }
 
 void ImGui_ImplAllegro5_Shutdown()
 {
     ImGui_ImplAllegro5_InvalidateDeviceObjects();
+    g_Display = NULL;
+
+    // Destroy last known clipboard data
+    if (g_ClipboardTextData)
+        al_free(g_ClipboardTextData);
+    g_ClipboardTextData = NULL;
 }
 
 // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.

examples/imgui_impl_sdl.cpp

@@ -190,6 +190,7 @@ void ImGui_ImplSDL2_Shutdown()
     // Destroy last known clipboard data
     if (g_ClipboardTextData)
         SDL_free(g_ClipboardTextData);
+    g_ClipboardTextData = NULL;
 
     // Destroy SDL mouse cursors
     for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_Count_; cursor_n++)