mirror of
https://github.com/Drezil/imgui.git
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406 lines
17 KiB
C++
406 lines
17 KiB
C++
// dear imgui: Renderer + Platform Binding for Allegro 5
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// (Info: Allegro 5 is a cross-platform general purpose library for handling windows, inputs, graphics, etc.)
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// Implemented features:
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// [X] Renderer: User texture binding. Use 'ALLEGRO_BITMAP*' as ImTextureID. Read the FAQ about ImTextureID in imgui.cpp.
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// [X] Platform: Clipboard support (from Allegro 5.1.12)
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// [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
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// Issues:
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// [ ] Renderer: The renderer is suboptimal as we need to unindex our buffers and convert vertices manually.
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// [ ] Platform: Missing gamepad support.
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// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
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// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp.
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// https://github.com/ocornut/imgui, Original Allegro 5 code by @birthggd
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2018-11-30: Platform: Added touchscreen support.
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// 2018-11-30: Misc: Setting up io.BackendPlatformName/io.BackendRendererName so they can be displayed in the About Window.
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// 2018-06-13: Platform: Added clipboard support (from Allegro 5.1.12).
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// 2018-06-13: Renderer: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
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// 2018-06-13: Renderer: Backup/restore transform and clipping rectangle.
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// 2018-06-11: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag.
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// 2018-04-18: Misc: Renamed file from imgui_impl_a5.cpp to imgui_impl_allegro5.cpp.
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// 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.
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// 2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplAllegro5_RenderDrawData() in the .h file so you can call it yourself.
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// 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
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// 2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
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#include <stdint.h> // uint64_t
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#include <cstring> // memcpy
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#include "imgui.h"
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#include "imgui_impl_allegro5.h"
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// Allegro
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#include <allegro5/allegro.h>
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#include <allegro5/allegro_primitives.h>
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#ifdef _WIN32
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#include <allegro5/allegro_windows.h>
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#endif
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#define ALLEGRO_HAS_CLIPBOARD (ALLEGRO_VERSION_INT >= ((5 << 24) | (1 << 16) | (12 << 8))) // Clipboard only supported from Allegro 5.1.12
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// Visual Studio warnings
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#ifdef _MSC_VER
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#pragma warning (disable: 4127) // condition expression is constant
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#endif
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// Data
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static ALLEGRO_DISPLAY* g_Display = NULL;
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static ALLEGRO_BITMAP* g_Texture = NULL;
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static double g_Time = 0.0;
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static ALLEGRO_MOUSE_CURSOR* g_MouseCursorInvisible = NULL;
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static ALLEGRO_VERTEX_DECL* g_VertexDecl = NULL;
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static char* g_ClipboardTextData = NULL;
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struct ImDrawVertAllegro
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{
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ImVec2 pos;
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ImVec2 uv;
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ALLEGRO_COLOR col;
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};
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// Render function.
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// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
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void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
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{
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// Backup Allegro state that will be modified
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ALLEGRO_TRANSFORM last_transform = *al_get_current_transform();
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ALLEGRO_TRANSFORM last_projection_transform = *al_get_current_projection_transform();
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int last_clip_x, last_clip_y, last_clip_w, last_clip_h;
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al_get_clipping_rectangle(&last_clip_x, &last_clip_y, &last_clip_w, &last_clip_h);
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int last_blender_op, last_blender_src, last_blender_dst;
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al_get_blender(&last_blender_op, &last_blender_src, &last_blender_dst);
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// Setup render state
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al_set_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA);
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// Setup orthographic projection matrix
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// Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right).
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{
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float L = draw_data->DisplayPos.x;
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float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
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float T = draw_data->DisplayPos.y;
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float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
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ALLEGRO_TRANSFORM transform;
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al_identity_transform(&transform);
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al_use_transform(&transform);
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al_orthographic_transform(&transform, L, T, 1.0f, R, B, -1.0f);
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al_use_projection_transform(&transform);
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}
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for (int n = 0; n < draw_data->CmdListsCount; n++)
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{
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const ImDrawList* cmd_list = draw_data->CmdLists[n];
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// Allegro's implementation of al_draw_indexed_prim() for DX9 is completely broken. Unindex our buffers ourselves.
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// FIXME-OPT: Unfortunately Allegro doesn't support 32-bits packed colors so we have to convert them to 4 float as well..
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static ImVector<ImDrawVertAllegro> vertices;
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vertices.resize(cmd_list->IdxBuffer.Size);
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for (int i = 0; i < cmd_list->IdxBuffer.Size; i++)
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{
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const ImDrawVert* src_v = &cmd_list->VtxBuffer[cmd_list->IdxBuffer[i]];
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ImDrawVertAllegro* dst_v = &vertices[i];
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dst_v->pos = src_v->pos;
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dst_v->uv = src_v->uv;
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unsigned char* c = (unsigned char*)&src_v->col;
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dst_v->col = al_map_rgba(c[0], c[1], c[2], c[3]);
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}
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const int* indices = NULL;
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if (sizeof(ImDrawIdx) == 2)
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{
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// FIXME-OPT: Unfortunately Allegro doesn't support 16-bit indices.. You can '#define ImDrawIdx int' in imconfig.h to request Dear ImGui to output 32-bit indices.
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// Otherwise, we convert them from 16-bit to 32-bit at runtime here, which works perfectly but is a little wasteful.
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static ImVector<int> indices_converted;
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indices_converted.resize(cmd_list->IdxBuffer.Size);
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for (int i = 0; i < cmd_list->IdxBuffer.Size; ++i)
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indices_converted[i] = (int)cmd_list->IdxBuffer.Data[i];
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indices = indices_converted.Data;
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}
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else if (sizeof(ImDrawIdx) == 4)
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{
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indices = (const int*)cmd_list->IdxBuffer.Data;
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}
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// Render command lists
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int idx_offset = 0;
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ImVec2 clip_off = draw_data->DisplayPos;
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for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
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{
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const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
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if (pcmd->UserCallback)
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{
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pcmd->UserCallback(cmd_list, pcmd);
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}
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else
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{
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ALLEGRO_BITMAP* texture = (ALLEGRO_BITMAP*)pcmd->TextureId;
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al_set_clipping_rectangle(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y, pcmd->ClipRect.z - pcmd->ClipRect.x, pcmd->ClipRect.w - pcmd->ClipRect.y);
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al_draw_prim(&vertices[0], g_VertexDecl, texture, idx_offset, idx_offset + pcmd->ElemCount, ALLEGRO_PRIM_TRIANGLE_LIST);
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}
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idx_offset += pcmd->ElemCount;
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}
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}
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// Restore modified Allegro state
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al_set_blender(last_blender_op, last_blender_src, last_blender_dst);
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al_set_clipping_rectangle(last_clip_x, last_clip_y, last_clip_w, last_clip_h);
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al_use_transform(&last_transform);
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al_use_projection_transform(&last_projection_transform);
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}
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bool ImGui_ImplAllegro5_CreateDeviceObjects()
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{
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// Build texture atlas
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ImGuiIO &io = ImGui::GetIO();
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unsigned char* pixels;
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int width, height;
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io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
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// Create texture
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int flags = al_get_new_bitmap_flags();
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int fmt = al_get_new_bitmap_format();
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al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP|ALLEGRO_MIN_LINEAR|ALLEGRO_MAG_LINEAR);
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al_set_new_bitmap_format(ALLEGRO_PIXEL_FORMAT_ABGR_8888_LE);
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ALLEGRO_BITMAP* img = al_create_bitmap(width, height);
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al_set_new_bitmap_flags(flags);
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al_set_new_bitmap_format(fmt);
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if (!img)
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return false;
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ALLEGRO_LOCKED_REGION *locked_img = al_lock_bitmap(img, al_get_bitmap_format(img), ALLEGRO_LOCK_WRITEONLY);
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if (!locked_img)
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{
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al_destroy_bitmap(img);
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return false;
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}
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memcpy(locked_img->data, pixels, sizeof(int)*width*height);
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al_unlock_bitmap(img);
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// Convert software texture to hardware texture.
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ALLEGRO_BITMAP* cloned_img = al_clone_bitmap(img);
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al_destroy_bitmap(img);
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if (!cloned_img)
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return false;
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// Store our identifier
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io.Fonts->TexID = (void*)cloned_img;
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g_Texture = cloned_img;
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// Create an invisible mouse cursor
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// Because al_hide_mouse_cursor() seems to mess up with the actual inputs..
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ALLEGRO_BITMAP* mouse_cursor = al_create_bitmap(8,8);
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g_MouseCursorInvisible = al_create_mouse_cursor(mouse_cursor, 0, 0);
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al_destroy_bitmap(mouse_cursor);
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return true;
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}
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void ImGui_ImplAllegro5_InvalidateDeviceObjects()
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{
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if (g_Texture)
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{
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al_destroy_bitmap(g_Texture);
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ImGui::GetIO().Fonts->TexID = NULL;
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g_Texture = NULL;
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}
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if (g_MouseCursorInvisible)
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{
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al_destroy_mouse_cursor(g_MouseCursorInvisible);
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g_MouseCursorInvisible = NULL;
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}
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}
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#if ALLEGRO_HAS_CLIPBOARD
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static const char* ImGui_ImplAllegro5_GetClipboardText(void*)
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{
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if (g_ClipboardTextData)
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al_free(g_ClipboardTextData);
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g_ClipboardTextData = al_get_clipboard_text(g_Display);
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return g_ClipboardTextData;
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}
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static void ImGui_ImplAllegro5_SetClipboardText(void*, const char* text)
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{
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al_set_clipboard_text(g_Display, text);
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}
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#endif
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bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
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{
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g_Display = display;
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// Setup back-end capabilities flags
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ImGuiIO& io = ImGui::GetIO();
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io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional)
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io.BackendPlatformName = io.BackendRendererName = "imgui_impl_allegro5";
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// Create custom vertex declaration.
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// Unfortunately Allegro doesn't support 32-bits packed colors so we have to convert them to 4 floats.
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// We still use a custom declaration to use 'ALLEGRO_PRIM_TEX_COORD' instead of 'ALLEGRO_PRIM_TEX_COORD_PIXEL' else we can't do a reliable conversion.
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ALLEGRO_VERTEX_ELEMENT elems[] =
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{
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{ ALLEGRO_PRIM_POSITION, ALLEGRO_PRIM_FLOAT_2, IM_OFFSETOF(ImDrawVertAllegro, pos) },
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{ ALLEGRO_PRIM_TEX_COORD, ALLEGRO_PRIM_FLOAT_2, IM_OFFSETOF(ImDrawVertAllegro, uv) },
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{ ALLEGRO_PRIM_COLOR_ATTR, 0, IM_OFFSETOF(ImDrawVertAllegro, col) },
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{ 0, 0, 0 }
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};
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g_VertexDecl = al_create_vertex_decl(elems, sizeof(ImDrawVertAllegro));
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io.KeyMap[ImGuiKey_Tab] = ALLEGRO_KEY_TAB;
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io.KeyMap[ImGuiKey_LeftArrow] = ALLEGRO_KEY_LEFT;
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io.KeyMap[ImGuiKey_RightArrow] = ALLEGRO_KEY_RIGHT;
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io.KeyMap[ImGuiKey_UpArrow] = ALLEGRO_KEY_UP;
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io.KeyMap[ImGuiKey_DownArrow] = ALLEGRO_KEY_DOWN;
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io.KeyMap[ImGuiKey_PageUp] = ALLEGRO_KEY_PGUP;
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io.KeyMap[ImGuiKey_PageDown] = ALLEGRO_KEY_PGDN;
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io.KeyMap[ImGuiKey_Home] = ALLEGRO_KEY_HOME;
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io.KeyMap[ImGuiKey_End] = ALLEGRO_KEY_END;
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io.KeyMap[ImGuiKey_Insert] = ALLEGRO_KEY_INSERT;
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io.KeyMap[ImGuiKey_Delete] = ALLEGRO_KEY_DELETE;
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io.KeyMap[ImGuiKey_Backspace] = ALLEGRO_KEY_BACKSPACE;
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io.KeyMap[ImGuiKey_Space] = ALLEGRO_KEY_SPACE;
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io.KeyMap[ImGuiKey_Enter] = ALLEGRO_KEY_ENTER;
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io.KeyMap[ImGuiKey_Escape] = ALLEGRO_KEY_ESCAPE;
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io.KeyMap[ImGuiKey_A] = ALLEGRO_KEY_A;
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io.KeyMap[ImGuiKey_C] = ALLEGRO_KEY_C;
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io.KeyMap[ImGuiKey_V] = ALLEGRO_KEY_V;
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io.KeyMap[ImGuiKey_X] = ALLEGRO_KEY_X;
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io.KeyMap[ImGuiKey_Y] = ALLEGRO_KEY_Y;
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io.KeyMap[ImGuiKey_Z] = ALLEGRO_KEY_Z;
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io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
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#if ALLEGRO_HAS_CLIPBOARD
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io.SetClipboardTextFn = ImGui_ImplAllegro5_SetClipboardText;
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io.GetClipboardTextFn = ImGui_ImplAllegro5_GetClipboardText;
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io.ClipboardUserData = NULL;
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#endif
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return true;
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}
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void ImGui_ImplAllegro5_Shutdown()
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{
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ImGui_ImplAllegro5_InvalidateDeviceObjects();
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g_Display = NULL;
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g_Time = 0.0;
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if (g_VertexDecl)
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al_destroy_vertex_decl(g_VertexDecl);
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g_VertexDecl = NULL;
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if (g_ClipboardTextData)
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al_free(g_ClipboardTextData);
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g_ClipboardTextData = NULL;
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}
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// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
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// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
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// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
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// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
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bool ImGui_ImplAllegro5_ProcessEvent(ALLEGRO_EVENT *ev)
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{
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ImGuiIO& io = ImGui::GetIO();
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switch (ev->type)
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{
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case ALLEGRO_EVENT_MOUSE_AXES:
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if (ev->mouse.display == g_Display)
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{
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io.MouseWheel += ev->mouse.dz;
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io.MouseWheelH += ev->mouse.dw;
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io.MousePos = ImVec2(ev->mouse.x, ev->mouse.y);
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}
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return true;
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case ALLEGRO_EVENT_MOUSE_BUTTON_DOWN:
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case ALLEGRO_EVENT_MOUSE_BUTTON_UP:
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if (ev->mouse.display == g_Display && ev->mouse.button <= 5)
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io.MouseDown[ev->mouse.button - 1] = (ev->type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN);
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return true;
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case ALLEGRO_EVENT_TOUCH_MOVE:
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if (ev->touch.display == g_Display)
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io.MousePos = ImVec2(ev->touch.x, ev->touch.y);
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return true;
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case ALLEGRO_EVENT_TOUCH_BEGIN:
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case ALLEGRO_EVENT_TOUCH_END:
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case ALLEGRO_EVENT_TOUCH_CANCEL:
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if (ev->touch.display == g_Display && ev->touch.primary)
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io.MouseDown[0] = (ev->type == ALLEGRO_EVENT_TOUCH_BEGIN);
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return true;
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case ALLEGRO_EVENT_MOUSE_LEAVE_DISPLAY:
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if (ev->mouse.display == g_Display)
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io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
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return true;
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case ALLEGRO_EVENT_KEY_CHAR:
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if (ev->keyboard.display == g_Display)
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if (ev->keyboard.unichar > 0 && ev->keyboard.unichar < 0x10000)
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io.AddInputCharacter((unsigned short)ev->keyboard.unichar);
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return true;
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case ALLEGRO_EVENT_KEY_DOWN:
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case ALLEGRO_EVENT_KEY_UP:
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if (ev->keyboard.display == g_Display)
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io.KeysDown[ev->keyboard.keycode] = (ev->type == ALLEGRO_EVENT_KEY_DOWN);
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return true;
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}
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return false;
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}
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static void ImGui_ImplAllegro5_UpdateMouseCursor()
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{
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ImGuiIO& io = ImGui::GetIO();
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if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
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return;
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ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
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if (io.MouseDrawCursor || imgui_cursor == ImGuiMouseCursor_None)
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{
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// Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
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al_set_mouse_cursor(g_Display, g_MouseCursorInvisible);
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}
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else
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{
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ALLEGRO_SYSTEM_MOUSE_CURSOR cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_DEFAULT;
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switch (imgui_cursor)
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{
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case ImGuiMouseCursor_TextInput: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_EDIT; break;
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case ImGuiMouseCursor_ResizeAll: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_MOVE; break;
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case ImGuiMouseCursor_ResizeNS: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_N; break;
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case ImGuiMouseCursor_ResizeEW: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_E; break;
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case ImGuiMouseCursor_ResizeNESW: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NE; break;
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case ImGuiMouseCursor_ResizeNWSE: cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NW; break;
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}
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al_set_system_mouse_cursor(g_Display, cursor_id);
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}
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}
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void ImGui_ImplAllegro5_NewFrame()
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{
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if (!g_Texture)
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ImGui_ImplAllegro5_CreateDeviceObjects();
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ImGuiIO &io = ImGui::GetIO();
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// Setup display size (every frame to accommodate for window resizing)
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int w, h;
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w = al_get_display_width(g_Display);
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h = al_get_display_height(g_Display);
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io.DisplaySize = ImVec2((float)w, (float)h);
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// Setup time step
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double current_time = al_get_time();
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io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f/60.0f);
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g_Time = current_time;
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// Setup inputs
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ALLEGRO_KEYBOARD_STATE keys;
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al_get_keyboard_state(&keys);
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io.KeyCtrl = al_key_down(&keys, ALLEGRO_KEY_LCTRL) || al_key_down(&keys, ALLEGRO_KEY_RCTRL);
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io.KeyShift = al_key_down(&keys, ALLEGRO_KEY_LSHIFT) || al_key_down(&keys, ALLEGRO_KEY_RSHIFT);
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io.KeyAlt = al_key_down(&keys, ALLEGRO_KEY_ALT) || al_key_down(&keys, ALLEGRO_KEY_ALTGR);
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io.KeySuper = al_key_down(&keys, ALLEGRO_KEY_LWIN) || al_key_down(&keys, ALLEGRO_KEY_RWIN);
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ImGui_ImplAllegro5_UpdateMouseCursor();
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}
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