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+unit UVisualizer;
+
+(* TODO:
+ * - fix video/visualizer switching
+ * - use GL_EXT_framebuffer_object for rendering to a separate framebuffer,
+ * this will prevent plugins from messing up our render-context
+ * (-> no stack corruption anymore, no need for Save/RestoreOpenGLState()).
+ * - create a generic (C-compatible) interface for visualization plugins
+ * - create a visualization plugin manager
+ * - write a plugin for projectM in C/C++ (so we need no wrapper anymore)
+ *)
+
+{* Note:
+ * It would be easier to create a seperate Render-Context (RC) for projectM
+ * and switch to it when necessary. This can be achieved by pbuffers
+ * (slow and platform specific) or the OpenGL FramebufferObject (FBO) extension
+ * (fast and plattform-independent but not supported by older graphic-cards/drivers).
+ *
+ * See http://oss.sgi.com/projects/ogl-sample/registry/EXT/framebuffer_object.txt
+ *
+ * To support as many cards as possible we will stick to the current dirty
+ * solution for now even if it is a pain to save/restore projectM's state due
+ * to bugs etc.
+ *
+ * This also restricts us to projectM. As other plug-ins might have different
+ * needs and bugs concerning the OpenGL state, USDX's state would probably be
+ * corrupted after the plug-in finshed drawing.
+ *}
+
+interface
+
+{$IFDEF FPC}
+ {$MODE DELPHI}
+{$ENDIF}
+
+{$I switches.inc}
+
+uses
+ SDL,
+ UGraphicClasses,
+ textgl,
+ math,
+ gl,
+ SysUtils,
+ UIni,
+ projectM,
+ UMusic;
+
+implementation
+
+uses
+ UGraphic,
+ UMain,
+ UConfig,
+ ULog;
+
+{$IF PROJECTM_VERSION < 1000000} // < 1.0
+// Initialization data used on projectM 0.9x creation.
+// Since projectM 1.0 this data is passed via the config-file.
+const
+ meshX = 32;
+ meshY = 24;
+ fps = 30;
+ textureSize = 512;
+{$IFEND}
+
+type
+ TVideoPlayback_ProjectM = class( TInterfacedObject, IVideoPlayback, IVideoVisualization )
+ private
+ pm: TProjectM;
+ ProjectMPath : string;
+ Initialized: boolean;
+
+ VisualizerStarted: boolean;
+ VisualizerPaused: boolean;
+
+ VisualTex: GLuint;
+ PCMData: TPCMData;
+ RndPCMcount: integer;
+
+ projMatrix: array[0..3, 0..3] of GLdouble;
+ texMatrix: array[0..3, 0..3] of GLdouble;
+
+ procedure VisualizerStart;
+ procedure VisualizerStop;
+
+ procedure VisualizerTogglePause;
+
+ function GetRandomPCMData(var data: TPCMData): Cardinal;
+
+ procedure SaveOpenGLState();
+ procedure RestoreOpenGLState();
+
+ public
+ function GetName: String;
+
+ function Init(): boolean;
+ function Finalize(): boolean;
+
+ function Open(const aFileName : string): boolean; // true if succeed
+ procedure Close;
+
+ procedure Play;
+ procedure Pause;
+ procedure Stop;
+
+ procedure SetPosition(Time: real);
+ function GetPosition: real;
+
+ procedure GetFrame(Time: Extended);
+ procedure DrawGL(Screen: integer);
+ end;
+
+
+function TVideoPlayback_ProjectM.GetName: String;
+begin
+ Result := 'ProjectM';
+end;
+
+function TVideoPlayback_ProjectM.Init(): boolean;
+begin
+ Result := true;
+
+ if (Initialized) then
+ Exit;
+ Initialized := true;
+
+ RndPCMcount := 0;
+
+ ProjectMPath := ProjectM_DataDir + PathDelim;
+
+ VisualizerStarted := False;
+ VisualizerPaused := False;
+
+ {$IFDEF UseTexture}
+ glGenTextures(1, PglUint(@VisualTex));
+ glBindTexture(GL_TEXTURE_2D, VisualTex);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ {$ENDIF}
+end;
+
+function TVideoPlayback_ProjectM.Finalize(): boolean;
+begin
+ VisualizerStop();
+ {$IFDEF UseTexture}
+ glDeleteTextures(1, PglUint(@VisualTex));
+ {$ENDIF}
+ Result := true;
+end;
+
+function TVideoPlayback_ProjectM.Open(const aFileName : string): boolean; // true if succeed
+begin
+ Result := false;
+end;
+
+procedure TVideoPlayback_ProjectM.Close;
+begin
+ VisualizerStop();
+end;
+
+procedure TVideoPlayback_ProjectM.Play;
+begin
+ VisualizerStart();
+end;
+
+procedure TVideoPlayback_ProjectM.Pause;
+begin
+ VisualizerTogglePause();
+end;
+
+procedure TVideoPlayback_ProjectM.Stop;
+begin
+ VisualizerStop();
+end;
+
+procedure TVideoPlayback_ProjectM.SetPosition(Time: real);
+begin
+ if assigned(pm) then
+ pm.RandomPreset();
+end;
+
+function TVideoPlayback_ProjectM.GetPosition: real;
+begin
+ Result := 0;
+end;
+
+{**
+ * Saves the current OpenGL state.
+ * This is necessary to prevent projectM from corrupting USDX's current
+ * OpenGL state.
+ *
+ * The following steps are performed:
+ * - All attributes are pushed to the attribute-stack
+ * - Projection-/Texture-matrices are saved
+ * - Modelview-matrix is pushed to the Modelview-stack
+ * - the OpenGL error-state (glGetError) is cleared
+ *}
+procedure TVideoPlayback_ProjectM.SaveOpenGLState();
+begin
+ // save all OpenGL state-machine attributes
+ glPushAttrib(GL_ALL_ATTRIB_BITS);
+
+ // Note: we do not use glPushMatrix() for the GL_PROJECTION and GL_TEXTURE stacks.
+ // OpenGL specifies the depth of those stacks to be at least 2 but projectM
+ // already uses 2 stack-entries so overflows might be possible on older hardware.
+ // In contrast to this the GL_MODELVIEW stack-size is at least 32, so we can
+ // use glPushMatrix() for this stack.
+
+ // save projection-matrix
+ glMatrixMode(GL_PROJECTION);
+ glGetDoublev(GL_PROJECTION_MATRIX, @projMatrix);
+ {$IF PROJECTM_VERSION = 1000000} // 1.0, 1.01
+ // bugfix: projection-matrix is popped without being pushed first
+ glPushMatrix();
+ {$IFEND}
+
+ // save texture-matrix
+ glMatrixMode(GL_TEXTURE);
+ glGetDoublev(GL_TEXTURE_MATRIX, @texMatrix);
+
+ // save modelview-matrix
+ glMatrixMode(GL_MODELVIEW);
+ glPushMatrix();
+ {$IF PROJECTM_VERSION = 1000000} // 1.0, 1.01
+ // bugfix: modelview-matrix is popped without being pushed first
+ glPushMatrix();
+ {$IFEND}
+
+ // reset OpenGL error-state
+ glGetError();
+end;
+
+{**
+ * Restores the OpenGL state saved by SaveOpenGLState()
+ * and resets the error-state.
+ *}
+procedure TVideoPlayback_ProjectM.RestoreOpenGLState();
+begin
+ // reset OpenGL error-state
+ glGetError();
+
+ // restore projection-matrix
+ glMatrixMode(GL_PROJECTION);
+ glLoadMatrixd(@projMatrix);
+
+ // restore texture-matrix
+ glMatrixMode(GL_TEXTURE);
+ glLoadMatrixd(@texMatrix);
+
+ // restore modelview-matrix
+ glMatrixMode(GL_MODELVIEW);
+ glPopMatrix();
+
+ // restore all OpenGL state-machine attributes
+ glPopAttrib();
+end;
+
+procedure TVideoPlayback_ProjectM.VisualizerStart;
+begin
+ if VisualizerStarted then
+ Exit;
+
+ // the OpenGL state must be saved before
+ SaveOpenGLState();
+ try
+
+ try
+ {$IF PROJECTM_VERSION >= 1000000} // >= 1.0
+ pm := TProjectM.Create(ProjectMPath + 'config.inp');
+ {$ELSE}
+ pm := TProjectM.Create(
+ meshX, meshY, fps, textureSize, ScreenW, ScreenH,
+ ProjectMPath + 'presets', ProjectMPath + 'fonts');
+ {$IFEND}
+ except on E: Exception do
+ begin
+ // Create() might fail if the config-file is not found
+ Log.LogError('TProjectM.Create: ' + E.Message, 'TVideoPlayback_ProjectM.VisualizerStart');
+ Exit;
+ end;
+ end;
+
+ // initialize OpenGL
+ pm.ResetGL(ScreenW, ScreenH);
+ // skip projectM default-preset
+ pm.RandomPreset();
+ // projectM >= 1.0 uses the OpenGL FramebufferObject (FBO) extension.
+ // Unfortunately it does NOT reset the framebuffer-context after
+ // TProjectM.Create. Either glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0) for
+ // a manual reset or TProjectM.RenderFrame() must be called.
+ // We use the latter so we do not need to load the FBO extension in USDX.
+ pm.RenderFrame();
+
+ VisualizerStarted := True;
+ finally
+ RestoreOpenGLState();
+ end;
+end;
+
+procedure TVideoPlayback_ProjectM.VisualizerStop;
+begin
+ if VisualizerStarted then
+ begin
+ VisualizerStarted := False;
+ FreeAndNil(pm);
+ end;
+end;
+
+procedure TVideoPlayback_ProjectM.VisualizerTogglePause;
+begin
+ VisualizerPaused := not VisualizerPaused;
+end;
+
+procedure TVideoPlayback_ProjectM.GetFrame(Time: Extended);
+var
+ nSamples: cardinal;
+ stackDepth: Integer;
+begin
+ if not VisualizerStarted then
+ Exit;
+
+ if VisualizerPaused then
+ Exit;
+
+ // get audio data
+ nSamples := AudioPlayback.GetPCMData(PcmData);
+
+ // generate some data if non is available
+ if (nSamples = 0) then
+ nSamples := GetRandomPCMData(PcmData);
+
+ // send audio-data to projectM
+ if (nSamples > 0) then
+ pm.AddPCM16Data(PSmallInt(@PcmData), nSamples);
+
+ // store OpenGL state (might be messed up otherwise)
+ SaveOpenGLState();
+ try
+ // setup projectM's OpenGL state
+ pm.ResetGL(ScreenW, ScreenH);
+
+ // let projectM render a frame
+ pm.RenderFrame();
+
+ {$IFDEF UseTexture}
+ glBindTexture(GL_TEXTURE_2D, VisualTex);
+ glFlush();
+ glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 0, VisualWidth, VisualHeight, 0);
+ {$ENDIF}
+ finally
+ // restore USDX OpenGL state
+ RestoreOpenGLState();
+ end;
+
+ // discard projectM's depth buffer information (avoid overlay)
+ glClear(GL_DEPTH_BUFFER_BIT);
+end;
+
+{**
+ * Draws the current frame to screen.
+ * TODO: this is not used yet. Data is directly drawn on GetFrame().
+ *}
+procedure TVideoPlayback_ProjectM.DrawGL(Screen: integer);
+begin
+ {$IFDEF UseTexture}
+ // have a nice black background to draw on
+ if (Screen = 1) then
+ begin
+ glClearColor(0, 0, 0, 0);
+ glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
+ end;
+
+ // exit if there's nothing to draw
+ if not VisualizerStarted then
+ Exit;
+
+ // setup display
+ glMatrixMode(GL_PROJECTION);
+ glPushMatrix();
+ glLoadIdentity();
+ gluOrtho2D(0, 1, 0, 1);
+ glMatrixMode(GL_MODELVIEW);
+ glPushMatrix();
+ glLoadIdentity();
+
+ glEnable(GL_BLEND);
+ glEnable(GL_TEXTURE_2D);
+ glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+ glBindTexture(GL_TEXTURE_2D, VisualTex);
+ glColor4f(1, 1, 1, 1);
+
+ // draw projectM frame
+ glBegin(GL_QUADS);
+ glTexCoord2f(0, 0); glVertex2f(0, 0);
+ glTexCoord2f(1, 0); glVertex2f(1, 0);
+ glTexCoord2f(1, 1); glVertex2f(1, 1);
+ glTexCoord2f(0, 1); glVertex2f(0, 1);
+ glEnd();
+
+ glDisable(GL_TEXTURE_2D);
+ glDisable(GL_BLEND);
+
+ // restore state
+ glMatrixMode(GL_PROJECTION);
+ glPopMatrix();
+ glMatrixMode(GL_MODELVIEW);
+ glPopMatrix();
+ {$ENDIF}
+end;
+
+{**
+ * Produces random "sound"-data in case no audio-data is available.
+ * Otherwise the visualization will look rather boring.
+ *}
+function TVideoPlayback_ProjectM.GetRandomPCMData(var data: TPCMData): Cardinal;
+var
+ i: integer;
+begin
+ // Produce some fake PCM data
+ if (RndPCMcount mod 500 = 0) then
+ begin
+ FillChar(data, SizeOf(TPCMData), 0);
+ end
+ else
+ begin
+ for i := 0 to 511 do
+ begin
+ data[i][0] := Random(High(Word)+1);
+ data[i][1] := Random(High(Word)+1);
+ end;
+ end;
+ Inc(RndPCMcount);
+ Result := 512;
+end;
+
+
+initialization
+ MediaManager.Add(TVideoPlayback_ProjectM.Create);
+
+end.