prepare for software renderer

do not use or your Furnace will need a replacement

src/gui/render/renderSoftware.cpp

@@ -0,0 +1,144 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2024 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "renderSoftware.h"
+#include "imgui_sw.hpp"
+#include "../../ta-log.h"
+
+class FurnaceSoftwareTexture: public FurnaceGUITexture {
+  public:
+  SWTexture* tex;
+  FurnaceSoftwareTexture():
+    tex(NULL) {}
+};
+
+ImTextureID FurnaceGUIRenderSoftware::getTextureID(FurnaceGUITexture* which) {
+  FurnaceSoftwareTexture* t=(FurnaceSoftwareTexture*)which;
+  return t->tex;
+}
+
+bool FurnaceGUIRenderSoftware::lockTexture(FurnaceGUITexture* which, void** data, int* pitch) {
+  FurnaceSoftwareTexture* t=(FurnaceSoftwareTexture*)which;
+  if (!t->tex->managed) return false;
+  *data=t->tex->pixels;
+  *pitch=t->tex->width*(t->tex->isAlpha?1:4);
+  return true;
+}
+
+bool FurnaceGUIRenderSoftware::unlockTexture(FurnaceGUITexture* which) {
+  return true;
+}
+
+bool FurnaceGUIRenderSoftware::updateTexture(FurnaceGUITexture* which, void* data, int pitch) {
+  FurnaceSoftwareTexture* t=(FurnaceSoftwareTexture*)which;
+  if (!t->tex->managed) return false;
+  memcpy(t->tex->pixels,data,pitch*t->tex->height);
+  return true;
+}
+
+FurnaceGUITexture* FurnaceGUIRenderSoftware::createTexture(bool dynamic, int width, int height, bool interpolate) {
+  FurnaceSoftwareTexture* ret=new FurnaceSoftwareTexture;
+  ret->tex=new SWTexture(width,height);
+  return ret;
+}
+
+bool FurnaceGUIRenderSoftware::destroyTexture(FurnaceGUITexture* which) {
+  FurnaceSoftwareTexture* t=(FurnaceSoftwareTexture*)which;
+
+  delete t->tex;
+  delete t;
+  return true;
+}
+
+void FurnaceGUIRenderSoftware::setTextureBlendMode(FurnaceGUITexture* which, FurnaceGUIBlendMode mode) {
+  // TODO
+}
+
+void FurnaceGUIRenderSoftware::setBlendMode(FurnaceGUIBlendMode mode) {
+  // TODO
+}
+
+void FurnaceGUIRenderSoftware::clear(ImVec4 color) {
+  // TODO
+}
+
+bool FurnaceGUIRenderSoftware::newFrame() {
+  return ImGui_ImplSW_NewFrame();
+}
+
+bool FurnaceGUIRenderSoftware::canVSync() {
+  return false;
+}
+
+void FurnaceGUIRenderSoftware::createFontsTexture() {
+  ImGui_ImplSW_CreateFontsTexture();
+}
+
+void FurnaceGUIRenderSoftware::destroyFontsTexture() {
+  ImGui_ImplSW_DestroyFontsTexture();
+}
+
+void FurnaceGUIRenderSoftware::renderGUI() {
+  ImGui_ImplSW_RenderDrawData(ImGui::GetDrawData());
+}
+
+void FurnaceGUIRenderSoftware::wipe(float alpha) {
+  // TODO
+}
+
+void FurnaceGUIRenderSoftware::present() {
+  // TODO?
+}
+
+bool FurnaceGUIRenderSoftware::getOutputSize(int& w, int& h) {
+  SDL_Surface* surf=SDL_GetWindowSurface(sdlWin);
+  if (surf==NULL) return false;
+  w=surf->w;
+  h=surf->h;
+  return true;
+}
+
+int FurnaceGUIRenderSoftware::getWindowFlags() {
+  return 0;
+}
+
+void FurnaceGUIRenderSoftware::setSwapInterval(int swapInterval) {
+}
+
+void FurnaceGUIRenderSoftware::preInit() {
+}
+
+bool FurnaceGUIRenderSoftware::init(SDL_Window* win, int swapInterval) {
+  sdlWin=win;
+  return true;
+}
+
+void FurnaceGUIRenderSoftware::initGUI(SDL_Window* win) {
+  // hack
+  ImGui_ImplSDL2_InitForMetal(win);
+  ImGui_ImplSW_Init(win);
+}
+
+void FurnaceGUIRenderSoftware::quitGUI() {
+  ImGui_ImplSW_Shutdown();
+}
+
+bool FurnaceGUIRenderSoftware::quit() {
+  return true;
+}