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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.

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This commit is contained in:
omar
2018-06-13 19:22:22 +02:00
parent 335f6fde7e
commit 185b4dde87
7 changed files with 315 additions and 24 deletions
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105
examples/imgui_impl_allegro5.cpp
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@ -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
{
@ -51,32 +63,53 @@ 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;
if (sizeof(ImDrawIdx) == 2)
{
// FIXME-OPT: Unfortunately Allegro doesn't support 16-bit indices.. You can '#define ImDrawIdx int' in imconfig.h to request ImGui to output 32-bit indices.
// FIXME-OPT: Unfortunately Allegro doesn't support 16-bit indices.. You can '#define ImDrawIdx int' in imconfig.h to request ImGui to output 32-bit indices.
// Otherwise, we convert them from 16-bit to 32-bit at runtime here, which works perfectly but is a little wasteful.
static ImVector<int> indices_converted;
indices_converted.resize(cmd_list->IdxBuffer.Size);
@ -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.