furnace/src/gui/render/renderSoftware.cpp

/**
 * Furnace Tracker - multi-system chiptune tracker
 * Copyright (C) 2021-2025 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;
  FurnaceGUITextureFormat format;
  FurnaceSoftwareTexture():
    tex(NULL),
    format(GUI_TEXFORMAT_UNKNOWN) {}
};

ImTextureID FurnaceGUIRenderSoftware::getTextureID(FurnaceGUITexture* which) {
  FurnaceSoftwareTexture* t=(FurnaceSoftwareTexture*)which;
  return (ImTextureID)t->tex;
}

FurnaceGUITextureFormat FurnaceGUIRenderSoftware::getTextureFormat(FurnaceGUITexture* which) {
  FurnaceSoftwareTexture* t=(FurnaceSoftwareTexture*)which;
  return t->format;
}

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, FurnaceGUITextureFormat format) {
  if (format!=GUI_TEXFORMAT_ARGB32) {
    logE("unsupported texture format!");
    return NULL;
  }
  FurnaceSoftwareTexture* ret=new FurnaceSoftwareTexture;
  ret->tex=new SWTexture(width,height);
  ret->format=format;
  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) {
  SDL_Surface* surf=SDL_GetWindowSurface(sdlWin);
  if (!surf) return;
  ImU32 clearToWhat=ImGui::ColorConvertFloat4ToU32(color);
  clearToWhat=(clearToWhat&0xff00ff00)|((clearToWhat&0xff)<<16)|((clearToWhat&0xff0000)>>16);

  bool mustLock=SDL_MUSTLOCK(surf);
  if (mustLock) {
    if (SDL_LockSurface(surf)!=0) return;
  }
  unsigned int* pixels=(unsigned int*)surf->pixels;
  for (size_t total=surf->w*surf->h; total; total--) {
    *(pixels++)=clearToWhat;
  }
  if (mustLock) {
    SDL_UnlockSurface(surf);
  }
}

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() {
  SDL_UpdateWindowSurface(sdlWin);
}

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;
}

int FurnaceGUIRenderSoftware::getMaxTextureWidth() {
  return 16384;
}

int FurnaceGUIRenderSoftware::getMaxTextureHeight() {
  return 16384;
}

unsigned int FurnaceGUIRenderSoftware::getTextureFormats() {
  return GUI_TEXFORMAT_ARGB32;
}

const char* FurnaceGUIRenderSoftware::getBackendName() {
  return "Software";
}

const char* FurnaceGUIRenderSoftware::getVendorName() {
  return "emilk, JesusKrists and tildearrow";
}

const char* FurnaceGUIRenderSoftware::getDeviceName() {
  return "imgui_sw Software Renderer";
}

const char* FurnaceGUIRenderSoftware::getAPIVersion() {
  return "N/A";
}

void FurnaceGUIRenderSoftware::setSwapInterval(int swapInterval) {
}

void FurnaceGUIRenderSoftware::preInit(const DivConfig& conf) {
}

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;
}