Complete BigTask

code/KM_Render_Mobile.pas

@@ -0,0 +1,215 @@
+unit KM_Render_Mobile;
+
+interface
+
+uses
+  KM_RenderTypes;
+
+procedure KMRenderMobileInvalidateCurrentContext;
+procedure KMRenderMobileInitializeCurrentContext;
+function KMRenderMobileTextureBackendReady: Boolean;
+function KMRenderMobileMaxTextureSize: Cardinal;
+procedure KMRenderMobileBindTexture(aTexId: Cardinal);
+function KMRenderMobileCreateTexture(aMinFilter, aMagFilter: TKMFilterType): Cardinal;
+procedure KMRenderMobileDeleteTexture(aTexId: Cardinal);
+procedure KMRenderMobileUpdateTexture(aTexture: Cardinal; aWidth, aHeight: Word; aMode: TKMTexFormat; const aData: Pointer);
+procedure KMRenderMobileInvalidateTextureBindingCache;
+
+implementation
+
+uses
+  SysUtils, CastleGLUtils, CastleGLES;
+
+var
+  gTextureBackendReady: Boolean;
+  gTextureBindingKnown: Boolean;
+  gCachedTextureId: Cardinal;
+
+
+procedure RequireTextureBackendReady;
+begin
+  if not gTextureBackendReady then
+    raise Exception.Create('Texture backend is not ready');
+end;
+
+
+procedure KMRenderMobileInvalidateCurrentContext;
+begin
+  gTextureBackendReady := False;
+  KMRenderMobileInvalidateTextureBindingCache;
+end;
+
+
+procedure KMRenderMobileInitializeCurrentContext;
+begin
+  gTextureBackendReady := False;
+  try
+    KMRenderMobileInvalidateTextureBindingCache;
+    if (GLFeatures = nil) or (GLFeatures.MaxTextureSize = 0) then
+      raise Exception.Create('Texture backend initialization failed');
+    if not (Assigned(glGenTextures)
+        and Assigned(glBindTexture)
+        and Assigned(glDeleteTextures)
+        and Assigned(glTexParameteri)
+        and Assigned(glTexImage2D)
+        and Assigned(glGetIntegerv)
+        and Assigned(glPixelStorei)) then
+      raise Exception.Create('Texture backend initialization failed');
+    gTextureBackendReady := True;
+  except
+    gTextureBackendReady := False;
+    raise;
+  end;
+end;
+
+
+procedure KMRenderMobileBindTexture(aTexId: Cardinal);
+begin
+  RequireTextureBackendReady;
+  if gTextureBindingKnown and (gCachedTextureId = aTexId) then Exit;
+
+  CastleGLES.glBindTexture(CastleGLES.GL_TEXTURE_2D, CastleGLES.GLuint(aTexId));
+  gCachedTextureId := aTexId;
+  gTextureBindingKnown := True;
+end;
+
+
+function IsPowerOfTwo(aValue: Cardinal): Boolean;
+begin
+  Result := (aValue <> 0) and ((aValue and (aValue - 1)) = 0);
+end;
+
+
+procedure KMRenderMobileUpdateTexture(aTexture: Cardinal; aWidth, aHeight: Word; aMode: TKMTexFormat; const aData: Pointer);
+var
+  alphaData: array of Byte;
+  pixelCount, I: Cardinal;
+  unpackAlignment: CastleGLES.GLint;
+  restoreUnpackAlignment: Boolean;
+begin
+  RequireTextureBackendReady;
+  if (aTexture = 0) or (aWidth = 0) or (aHeight = 0)
+     or not IsPowerOfTwo(aWidth) or not IsPowerOfTwo(aHeight)
+     or (aData = nil) then
+    raise Exception.Create('Invalid texture upload parameters');
+
+  if aMode = tfAlpha8 then
+  begin
+    pixelCount := Cardinal(aWidth) * Cardinal(aHeight);
+    SetLength(alphaData, pixelCount);
+    for I := 0 to pixelCount - 1 do
+      alphaData[I] := Byte((PCardinal(aData)[I] shr 24) and $FF);
+  end;
+
+  CastleGLES.glGetIntegerv(CastleGLES.GL_UNPACK_ALIGNMENT, @unpackAlignment);
+  restoreUnpackAlignment := unpackAlignment <> 1;
+  if restoreUnpackAlignment then
+    CastleGLES.glPixelStorei(CastleGLES.GL_UNPACK_ALIGNMENT, 1);
+  try
+    KMRenderMobileBindTexture(aTexture);
+    try
+      case aMode of
+        tfRGB5A1:
+          begin
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_R, CastleGLES.GL_RED);
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_G, CastleGLES.GL_GREEN);
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_B, CastleGLES.GL_BLUE);
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_A, CastleGLES.GL_ALPHA);
+            CastleGLES.glTexImage2D(CastleGLES.GL_TEXTURE_2D, 0, CastleGLES.GL_RGB5_A1, aWidth, aHeight, 0, CastleGLES.GL_RGBA, CastleGLES.GL_UNSIGNED_BYTE, aData);
+          end;
+        tfRGBA8:
+          begin
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_R, CastleGLES.GL_RED);
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_G, CastleGLES.GL_GREEN);
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_B, CastleGLES.GL_BLUE);
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_A, CastleGLES.GL_ALPHA);
+            CastleGLES.glTexImage2D(CastleGLES.GL_TEXTURE_2D, 0, CastleGLES.GL_RGBA8, aWidth, aHeight, 0, CastleGLES.GL_RGBA, CastleGLES.GL_UNSIGNED_BYTE, aData);
+          end;
+        tfAlpha8:
+          begin
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_R, CastleGLES.GL_ONE);
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_G, CastleGLES.GL_ONE);
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_B, CastleGLES.GL_ONE);
+            CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_SWIZZLE_A, CastleGLES.GL_RED);
+            CastleGLES.glTexImage2D(CastleGLES.GL_TEXTURE_2D, 0, CastleGLES.GL_R8, aWidth, aHeight, 0, CastleGLES.GL_RED, CastleGLES.GL_UNSIGNED_BYTE, @alphaData[0]);
+          end;
+      end;
+    finally
+      KMRenderMobileBindTexture(0);
+    end;
+  finally
+    if restoreUnpackAlignment then
+      CastleGLES.glPixelStorei(CastleGLES.GL_UNPACK_ALIGNMENT, unpackAlignment);
+  end;
+end;
+
+
+function TextureFilter(aFilter: TKMFilterType): CastleGLES.GLint;
+begin
+  case aFilter of
+    ftNearest: Result := CastleGLES.GL_NEAREST;
+    ftLinear:  Result := CastleGLES.GL_LINEAR;
+  end;
+end;
+
+
+function KMRenderMobileCreateTexture(aMinFilter, aMagFilter: TKMFilterType): Cardinal;
+var
+  texture: CastleGLES.GLuint;
+begin
+  RequireTextureBackendReady;
+  texture := 0;
+  CastleGLES.glGenTextures(1, @texture);
+  if texture = 0 then
+    raise Exception.Create('Texture generation failed');
+  try
+    KMRenderMobileBindTexture(Cardinal(texture));
+    CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_MIN_FILTER, TextureFilter(aMinFilter));
+    CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_MAG_FILTER, TextureFilter(aMagFilter));
+    CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_WRAP_S, CastleGLES.GL_CLAMP_TO_EDGE);
+    CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_WRAP_T, CastleGLES.GL_CLAMP_TO_EDGE);
+    CastleGLES.glTexParameteri(CastleGLES.GL_TEXTURE_2D, CastleGLES.GL_TEXTURE_MAX_LEVEL, 0);
+    Result := Cardinal(texture);
+  except
+    KMRenderMobileDeleteTexture(Cardinal(texture));
+    raise;
+  end;
+end;
+
+
+procedure KMRenderMobileDeleteTexture(aTexId: Cardinal);
+var
+  texture: CastleGLES.GLuint;
+begin
+  RequireTextureBackendReady;
+  if aTexId = 0 then Exit;
+  texture := CastleGLES.GLuint(aTexId);
+  CastleGLES.glDeleteTextures(1, @texture);
+  if gTextureBindingKnown and (gCachedTextureId = aTexId) then
+    gCachedTextureId := 0;
+end;
+
+
+procedure KMRenderMobileInvalidateTextureBindingCache;
+begin
+  gTextureBindingKnown := False;
+end;
+
+
+function KMRenderMobileTextureBackendReady: Boolean;
+begin
+  Result := gTextureBackendReady;
+end;
+
+
+function KMRenderMobileMaxTextureSize: Cardinal;
+begin
+  RequireTextureBackendReady;
+  if GLFeatures = nil then
+    raise Exception.Create('Texture backend feature state is unavailable');
+  Result := GLFeatures.MaxTextureSize;
+  if Result = 0 then
+    raise Exception.Create('Texture backend maximum texture size is unavailable');
+end;
+
+end.

config/extra-paths.json

@@ -17,7 +17,8 @@
     "src/res/KM_ResTileset.pas",
     "src/res/KM_ResPalettes.pas",
     "src/res/KM_ResMapElements.pas",
-    "src/res/KM_ResLocales.pas"
+    "src/res/KM_ResLocales.pas",
+    "src/render/KM_Render.pas"
   ],
   "source_paths": [
     "code/resource"

port-source/kam_remake/src/render/KM_Render.pas

@@ -0,0 +1,395 @@
+unit KM_Render;
+{$I KaM_Remake.inc}
+interface
+uses
+  {$IFDEF WDC} Windows, {$ENDIF}
+  {$IFDEF Unix} LCLIntf, LCLType, OpenGLContext, {$ENDIF}
+  dglOpenGL,
+  KM_RenderControl, KM_RenderQuery, KM_RenderTypes, KM_CommonTypes;
+
+
+const
+  TEX_FORMAT_SIZE: array [TKMTexFormat] of Byte = (2, 4, 1);
+
+type
+  TKMRenderMode = (rm2D, rm3D);
+
+  //General OpenGL handling
+  TKMRender = class
+  private class var
+    fMaxViewportDim: Cardinal; // Max Viewport Dimensions, which could be used for FBO render
+  private
+    // Flag, True when FBO is inited. We don't need to init FBO for every run, since its only used in SaveMapToImageFile feature
+    fFBOInited: Boolean;
+    // Off-screen buffer, example from https://stackoverflow.com/questions/12157646/how-to-render-offscreen-on-opengl
+    fFBO: Cardinal;
+    fRenderBuf: Cardinal;
+
+    fRenderControl: TKMRenderControl;
+    fOpenGL_Vendor, fOpenGL_Renderer, fOpenGL_Version: UnicodeString;
+    fScreenX, fScreenY: Word;
+    fBlind: Boolean;
+    fQuery: TKMRenderQuery;
+
+    procedure InitFBO;
+    procedure SaveBufferToFile(aUseFBOBuffer: Boolean; var aWidth, aHeight: Integer; var aPixelData: TKMCardinalArray);
+    function GetMaxFBOSize: Cardinal;
+  public
+    constructor Create(aRenderControl: TKMRenderControl; aScreenX, aScreenY: Integer; aVSync: Boolean);
+    destructor Destroy; override;
+
+    procedure SetRenderMode(aRenderMode: TKMRenderMode); //Switch between 2D and 3D perspectives
+
+    class procedure GraphicsContextChanged(aAvailable: Boolean); static;
+    class function TextureBackendReady: Boolean; static;
+    class function GetMaxTexSize: Cardinal; static;
+    class function GetMaxViewportDim: Cardinal; static;
+    class function GenerateTextureCommon(aMinFilter, aMagFilter: TKMFilterType): Cardinal;
+    class function GenTexture(DestX, DestY: Word; const Data: Pointer; Mode: TKMTexFormat; aMinFilter, aMagFilter: TKMFilterType): Cardinal;
+    class procedure DeleteTexture(aTex: Cardinal);
+    class procedure UpdateTexture(aTexture: Cardinal; DestX, DestY: Word; Mode: TKMTexFormat; const Data: Pointer);
+    class procedure BindTexture(aTexId: Cardinal);
+    class procedure InvalidateTextureBindingCache; static;
+
+    class property MaxTextureSize: Cardinal read GetMaxTexSize;
+    class property MaxViewportDim: Cardinal read GetMaxViewportDim;
+
+    property MaxFBOSize: Cardinal read GetMaxFBOSize;
+    property RendererVersion: UnicodeString read fOpenGL_Version;
+    function IsOldGLVersion: Boolean;
+    procedure Resize(aWidth, aHeight: Integer);
+
+    procedure ReadRenderedToScreenPixels(var aWidth, aHeight: Integer; var aPixelData: TKMCardinalArray);
+    procedure ReadRenderedToFBOPixels(var aWidth, aHeight: Integer; var aPixelData: TKMCardinalArray);
+
+    property ScreenX: Word read fScreenX;
+    property ScreenY: Word read fScreenY;
+    property Blind: Boolean read fBlind;
+
+    property Query: TKMRenderQuery read fQuery;
+
+    procedure BeginFrame;
+    procedure RenderBrightness(aValue: Byte);
+    procedure EndFrame;
+  end;
+
+var
+  gRender: TKMRender;
+
+
+implementation
+uses
+  SysUtils, Math,
+  KromOGLUtils, KromUtils,
+  KM_Log, KM_Defaults, KM_IoPNG, KM_CommonClasses,
+  KM_Render_Mobile;
+
+const
+  // We want to use off-screen FBO buffer to render full map to the file,
+  // we are restricted with max file we are able to write via TBitmap or TJpegImage or TPNGImage atm
+  // could check https://github.com/graphics32 package to solve this issue with saving ultra large images
+  MAX_FBO_BUFFER_SIZE = CELL_SIZE_PX * (MAX_MAP_SIZE - 1); // (10200 = CELL_SIZE=40px)*255
+
+{ TKMRender }
+constructor TKMRender.Create(aRenderControl: TKMRenderControl; aScreenX, aScreenY: Integer; aVSync: Boolean);
+begin
+  inherited Create;
+
+  gLog.AddTime('Init Render started');
+
+  fFBOInited := False;
+  fBlind := aRenderControl = nil;
+  fRenderControl := aRenderControl;
+
+  if not fBlind then
+  begin
+    fQuery := TKMRenderQuery.Create;
+
+    fRenderControl.CreateRenderContext;
+
+    fMaxViewportDim := GetMaxViewportDim;
+    gLog.AddTime('GL_MAX_VIEWPORT_DIM = ' + IntToStr(fMaxViewportDim));
+
+    glClearColor(0, 0, 0, 0); 	   //Background
+    glClearStencil(0);
+    glDepthFunc(GL_LEQUAL);
+    glShadeModel(GL_SMOOTH);                 //Enables Smooth Color Shading
+    glPolygonMode(GL_FRONT, GL_FILL);
+    glEnable(GL_NORMALIZE);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); //Set alpha mode
+    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
+    glEnable(GL_COLOR_MATERIAL);                 //Enable Materials
+    glEnable(GL_TEXTURE_2D);                     // Enable Texture Mapping
+    glDisable(GL_LIGHTING); //We don't need it
+    //glEnable(GL_CULL_FACE);
+    //glCullFace(GL_FRONT);
+
+    fOpenGL_Vendor   := UnicodeString(glGetString(GL_VENDOR));   gLog.AddNoTime('OpenGL Vendor: '   + fOpenGL_Vendor);
+    fOpenGL_Renderer := UnicodeString(glGetString(GL_RENDERER)); gLog.AddNoTime('OpenGL Renderer: ' + fOpenGL_Renderer);
+    fOpenGL_Version  := UnicodeString(glGetString(GL_VERSION));  gLog.AddNoTime('OpenGL Version: '  + fOpenGL_Version);
+
+    SetupVSync(aVSync);
+
+    Resize(aScreenX, aScreenY);
+  end;
+  gLog.AddTime('Init Render Done');
+end;
+
+
+destructor TKMRender.Destroy;
+begin
+  if not fBlind then
+  begin
+    fRenderControl.DestroyRenderContext;
+    fQuery.Free;
+
+    if fFBOInited then
+    begin
+      glDeleteFramebuffers(1,@fFBO);
+      glDeleteRenderbuffers(1,@fRenderBuf);
+    end;
+  end;
+
+  inherited;
+end;
+
+
+procedure TKMRender.InitFBO;
+begin
+  if fFBOInited then Exit;
+
+  fFBOInited := True;
+
+  glGenFramebuffers(1, @fFBO);
+  glGenRenderbuffers(1, @fRenderBuf);
+  glBindRenderbuffer(GL_RENDERBUFFER, fRenderBuf);
+  glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA, GetMaxFBOSize, GetMaxFBOSize);
+  glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fFBO);
+  glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, fRenderBuf);
+end;
+
+
+//We have to use this method EVERY time we want to bind texture. Otherwise collisions could happen
+//
+//Do not bind same texture again, it can drastically change render performance
+//F.e. on an average Map (Cube 256x256) when full map is shown in viewport
+//there are only ~10k new texture binds, when all other ~30k binds can be skipped
+class procedure TKMRender.BindTexture(aTexId: Cardinal);
+begin
+  KMRenderMobileBindTexture(aTexId);
+end;
+
+
+class procedure TKMRender.InvalidateTextureBindingCache;
+begin
+  KMRenderMobileInvalidateTextureBindingCache;
+end;
+
+
+procedure TKMRender.Resize(aWidth, aHeight: Integer);
+begin
+  if fBlind then Exit;
+
+  fScreenX := max(aWidth, 1);
+  fScreenY := max(aHeight, 1);
+  glViewport(0, 0, fScreenX, fScreenY);
+end;
+
+
+procedure TKMRender.SetRenderMode(aRenderMode: TKMRenderMode);
+begin
+  if fBlind then Exit;
+
+  glMatrixMode(GL_PROJECTION); //Change Matrix Mode to Projection
+  glLoadIdentity; //Reset View
+
+  //In 2D mode we use Z-test to clip terrain shadows behind mountains
+  //1 unit for each tile strip. 512 means we can handle up to 512x512 maps
+  case aRenderMode of
+    rm2D: glOrtho(0, fScreenX, fScreenY, 0, -100, 100);
+    rm3D: gluPerspective(80, -fScreenX/fScreenY, 0.1, 5000);
+  end;
+  glMatrixMode(GL_MODELVIEW); //Return to the modelview matrix
+  glLoadIdentity; //Reset View
+end;
+
+
+class function TKMRender.GenerateTextureCommon(aMinFilter, aMagFilter: TKMFilterType): Cardinal;
+begin
+  Result := KMRenderMobileCreateTexture(aMinFilter, aMagFilter);
+end;
+
+
+//Generate texture out of TCardinalArray
+class function TKMRender.GenTexture(DestX, DestY: Word; const Data: Pointer; Mode: TKMTexFormat; aMinFilter, aMagFilter: TKMFilterType): Cardinal;
+var
+  texture: Cardinal;
+begin
+  texture := GenerateTextureCommon(aMinFilter, aMagFilter);
+  try
+    UpdateTexture(texture, DestX, DestY, Mode, Data);
+    Result := texture;
+  except
+    DeleteTexture(texture);
+    raise;
+  end;
+end;
+
+
+class procedure TKMRender.DeleteTexture(aTex: Cardinal);
+begin
+  KMRenderMobileDeleteTexture(aTex);
+end;
+
+
+function TKMRender.GetMaxFBOSize: Cardinal;
+begin
+  Result := Min(fMaxViewportDim, MAX_FBO_BUFFER_SIZE);
+end;
+
+
+class procedure TKMRender.GraphicsContextChanged(aAvailable: Boolean);
+begin
+  if aAvailable then
+    KMRenderMobileInitializeCurrentContext
+  else
+    KMRenderMobileInvalidateCurrentContext;
+end;
+
+
+class function TKMRender.TextureBackendReady: Boolean;
+begin
+  Result := KMRenderMobileTextureBackendReady;
+end;
+
+
+class function TKMRender.GetMaxTexSize: Cardinal;
+begin
+  Result := KMRenderMobileMaxTextureSize;
+end;
+
+
+class function TKMRender.GetMaxViewportDim: Cardinal;
+begin
+  if fMaxViewportDim > 0 then Exit(fMaxViewportDim);
+
+  //Get max supported dimensions for viewport (used in off-screen render, FBO)
+  glGetIntegerv(GL_MAX_VIEWPORT_DIMS, @fMaxViewportDim);
+  Result := fMaxViewportDim;
+end;
+
+
+//Update texture with TCardinalArray
+class procedure TKMRender.UpdateTexture(aTexture: Cardinal; DestX, DestY: Word; Mode: TKMTexFormat; const Data: Pointer);
+begin
+  KMRenderMobileUpdateTexture(aTexture, DestX, DestY, Mode, Data);
+end;
+
+
+//1.4 is considered to be our minimal requirement
+function TKMRender.IsOldGLVersion: Boolean;
+begin
+  Result := not fBlind and not GL_VERSION_1_4;
+end;
+
+
+procedure TKMRender.ReadRenderedToScreenPixels(var aWidth, aHeight: Integer; var aPixelData: TKMCardinalArray);
+begin
+  SaveBufferToFile(False, aWidth, aHeight, aPixelData);
+end;
+
+
+procedure TKMRender.ReadRenderedToFBOPixels(var aWidth, aHeight: Integer; var aPixelData: TKMCardinalArray);
+begin
+  SaveBufferToFile(True, aWidth, aHeight, aPixelData);
+end;
+
+
+procedure TKMRender.SaveBufferToFile(aUseFBOBuffer: Boolean; var aWidth, aHeight: Integer; var aPixelData: TKMCardinalArray);
+{$IFDEF WDC}
+var
+  I, K: Integer;
+{$ENDIF}
+begin
+{$IFDEF WDC}
+  aWidth := ScreenX;
+  aHeight := ScreenY;
+
+  if aUseFBOBuffer then
+  begin
+    // Read from offscreen buffer
+    glReadBuffer(GL_COLOR_ATTACHMENT0);
+    // Bind to FBO framebuffer
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, fFBO);
+  end
+  else
+    // Read from onscreen buffer
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+
+  SetLength(aPixelData, aWidth * aHeight + 1);
+  glReadPixels(0, 0, aWidth, aHeight, GL_BGRA, GL_UNSIGNED_BYTE, @aPixelData[0]);
+
+  if aUseFBOBuffer then
+    // Return to onscreen rendering:
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+
+  //Mirror verticaly
+  for i := 0 to (aHeight div 2) - 1 do
+    for K := 0 to aWidth - 1 do
+      SwapInt(aPixelData[i * aWidth + K], aPixelData[((aHeight - 1) - i) * aWidth + K]);
+{$ENDIF}
+end;
+
+
+procedure TKMRender.BeginFrame;
+begin
+  if fBlind then Exit;
+
+  if SAVE_MAP_TO_FBO_RENDER then
+  begin
+    if not fFBOInited then
+      // Init once
+      InitFBO // glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fFBO) is called while initialization
+    else
+      glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fFBO);
+  end;
+
+  glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT or GL_STENCIL_BUFFER_BIT);
+  SetRenderMode(rm2D);
+
+  //RC.Activate for OSX
+end;
+
+
+//Render highlight overlay to make whole picture look brighter (more saturated)
+procedure TKMRender.RenderBrightness(aValue: Byte);
+begin
+  if fBlind then Exit;
+
+  //There will be no change to image anyway
+  if aValue = 0 then Exit;
+
+  BindTexture(0); // We have to reset texture to default (0), because it could be bind to any other texture (atlas)
+
+  glLoadIdentity;
+  glBlendFunc(GL_DST_COLOR, GL_ONE);
+  glColor4f(aValue/20, aValue/20, aValue/20, aValue/20);
+  glBegin(GL_QUADS);
+    glkRect(0, 0, ScreenX, ScreenY);
+  glEnd;
+
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+end;
+
+
+procedure TKMRender.EndFrame;
+begin
+  if fBlind then Exit;
+
+  glFinish;
+  fRenderControl.SwapBuffers;
+end;
+
+
+end.

port-source/kam_remake/src/res/KM_ResSprites.pas

@@ -269,7 +269,6 @@ function GetMaxAtlasSize: Integer;
 begin
   Result := MAX_GAME_ATLAS_SIZE;
   {$IFNDEF NO_OGL}
-  if gRender <> nil then
   Result := Min(Result, TKMRender.MaxTextureSize);
   {$ENDIF}
 end;